JP4045455B2 - Television broadcast receiver - Google Patents

Description

  The present invention relates to a television broadcast receiving apparatus.

  Conventionally, a television broadcast receiving apparatus includes a plurality of tuners for receiving broadcast waves of a plurality of channels, and from each of the television broadcast waves, each tuner selectively receives a broadcast wave having a frequency of each channel and receives the tuner. The demodulated broadcast wave data is demodulated, and the demodulated data is output to a display device or an audio output device or stored in a storage device (for example, Patent Documents 1 and 2).

  Further, not only video data and audio data but also program schedule data called EPG (Electronic Program Guide) are transmitted simultaneously as television broadcast waves. A digital broadcast receiving apparatus that displays a program schedule on a display apparatus using the EPG data is also known (for example, Patent Document 3).

Also, in a digital broadcast receiving apparatus that performs channel search to search for broadcast waves that are broadcasting a program from digital broadcast waves, the program is broadcast based on the reception level and noise level of the received broadcast wave data. It is also known that only a broadcast wave that is broadcasting a program is determined by determining whether the broadcast wave is a broadcast wave (for example, Patent Documents 4 and 5).
JP 2004-336518 A JP 2003-163852 A JP 2005-39487 A JP 2004-266658 A JP 2005-5894 A

  However, as in Patent Documents 1 and 2, if a tuner is provided for each channel, for example, in the case of a digital broadcast wave, about 50 channels of broadcast waves are included. Is stored in the storage device, tuners for 50 channels are required, which is expensive and the television broadcast receiver becomes very expensive. Further, as in Patent Documents 3 to 5, even if only the data of the broadcast wave that broadcasts the program is accumulated, a tuner corresponding to the number of desired channels is still necessary.

  Therefore, if the radio waves of the entire band of the television broadcast wave are always sampled and converted into digital data and stored in the storage device, a tuner need not be provided for each channel. If the entire bandwidth is sampled, the amount of data sampled per unit time becomes enormous, which is not realistic.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a television broadcast receiving apparatus that efficiently stores television broadcast wave data without providing a tuner corresponding to each channel of the television broadcast wave.

The invention described in claim 1 is a determining means for determining a predetermined range of frequency bands in the RF signal of the television broadcast wave;
Baseband signal generation means for generating a baseband signal corresponding to the frequency band determined by the determination means from the RF signal;
A / D conversion means for analog-digital conversion of the baseband signal generated by the baseband signal generation means;
A memory unit for storing digital data converted by the A / D conversion unit;
D / A conversion means for converting the digital data stored in the memory section into a baseband signal by digital-analog conversion;
IF signal generation means for generating an IF signal of a predetermined channel from the baseband signal converted by the D / A conversion means;
Search means for searching for physical channels with broadcast waves,
The determining means includes
Based on the physical channels with broadcast waves searched by the search means, the frequency band with the largest number of physical channels with broadcast waves is determined as the frequency band of the predetermined range within the frequency band range for a predetermined number of channels. It is characterized by that.

According to a second aspect of the present invention, there is provided determining means for determining a predetermined range of frequency bands in an RF signal of a television broadcast wave;
Baseband signal generation means for generating a baseband signal corresponding to the frequency band determined by the determination means from the RF signal;
A / D conversion means for analog-digital conversion of the baseband signal generated by the baseband signal generation means;
A memory unit for storing digital data converted by the A / D conversion unit;
It is characterized by having.

The invention described in claim 3 is the television broadcast receiver according to claim 2,
A search means for searching for physical channels with broadcast waves is provided.
The determining means includes
Based on the physical channels with broadcast waves searched by the search means, the frequency band with the largest number of physical channels with broadcast waves is determined as the frequency band of the predetermined range within the frequency band range for a predetermined number of channels. It is characterized by that.

According to a fourth aspect of the present invention, in the television broadcast receiving apparatus according to the second aspect,
Input means for entering keywords;
Storage means for storing EPG data included in the broadcast wave;
Search means for extracting a program including the keyword input by the input means with reference to the storage means, and searching for a physical channel on which the program is broadcast,
The determining means is a physical channel on which the program including the keyword is broadcast within a frequency band range of a predetermined number of channels based on the physical channel on which the program including the keyword searched by the search means is broadcast. The frequency band having the largest frequency is determined as the frequency band of the predetermined range.

The invention described in claim 5 is the television broadcast receiver according to any one of claims 2 to 4,
D / A conversion means for converting the digital data stored in the memory section into a baseband signal by digital-analog conversion;
IF signal generating means for generating an IF signal of a predetermined channel from the baseband signal converted by the D / A converting means.

According to the first aspect of the present invention, the determining unit determines a predetermined frequency band in the RF signal of the television broadcast wave, and the baseband signal generating unit determines the frequency determined by the determining unit from the RF signal. A baseband signal corresponding to the band is generated, and the baseband signal generated by the baseband signal generation unit is analog-digital converted by the A / D conversion unit, and the digital signal converted by the A / D conversion unit by the memory unit Since the data is stored, the RF signal of the television broadcast wave is converted into an IF signal by the tuner and stored in the memory unit without being subjected to demodulation processing or the like, so that there is no need to provide a tuner for each channel. , RF signal in a predetermined frequency band determined by the determining means is converted from analog to digital and stored in the memory unit Kill.

  Further, since the determining means determines the frequency band of the predetermined range of the RF signal to be analog-digital converted and stored in the memory unit, the amount of data to be analog-digital converted per unit time can be suppressed, so that the TV can be efficiently operated. John broadcast wave data can be stored in the memory unit.

  Further, based on the physical channels with broadcast waves searched by the search means by the determining means, the frequency band with the largest number of physical channels with broadcast waves within the frequency band range for the predetermined number of channels is the frequency within the predetermined range. Since the band is determined, the data of the physical channel on which the program is broadcast can be efficiently stored in the memory unit.

  Further, the digital data stored in the memory unit is digital-analog converted into a baseband signal by the D / A conversion unit, and the baseband signal converted by the D / A conversion unit by the IF signal generation unit is set to a predetermined value. Since the IF signal of each channel is reproduced, the IF signal desired by the user is generated directly from the digital data stored in the memory unit without reproducing the RF signal, and stored in the memory unit more efficiently. The reproduced digital data can be reproduced.

  According to the second aspect of the present invention, the determining unit determines a predetermined frequency band in the RF signal of the television broadcast wave, and the baseband signal generating unit determines the frequency determined from the RF signal to the determining unit. A baseband signal corresponding to the band is generated, and the baseband signal generated by the baseband signal generation unit is analog-digital converted by the A / D conversion unit, and the digital signal converted by the A / D conversion unit by the memory unit Since the data is stored, the RF signal of the television broadcast wave is converted into an IF signal by the tuner and stored in the memory unit without being subjected to demodulation processing or the like, so that there is no need to provide a tuner for each channel. The RF signal in the predetermined frequency band determined by the determining means can be converted from analog to digital and stored in the memory unit.

  Further, since the determining means determines the frequency band of the predetermined range of the RF signal to be analog-digital converted and stored in the memory unit, the amount of data to be analog-digital converted per unit time can be suppressed, so that the TV can be efficiently operated. John broadcast wave data can be stored in the memory unit.

  According to the third aspect of the present invention, the same effect as that of the second aspect of the invention can be obtained. In particular, the physical channel with the broadcast wave searched by the search unit by the determination unit is provided. Based on the frequency band range of the predetermined number of channels, the frequency band with the largest number of physical channels with broadcast waves is determined as the frequency band of the predetermined range, so the data of the physical channel on which the program is broadcast is efficiently used. It can be well stored in the memory unit.

  According to the invention described in claim 4, the same effect as that of the invention described in claim 2 can be obtained, and in particular, a program including the keyword searched by the searching means is broadcast by the determining means. The frequency band with the largest number of physical channels on which the program containing the keyword is broadcast is determined as the frequency band within the predetermined range within the frequency band range for the predetermined number of channels. Data of a physical channel on which a program including a keyword related to the program is broadcast can be efficiently stored in the memory unit.

According to the fifth aspect of the present invention, it is possible to obtain the same effect as that of the second aspect of the present invention. The stored digital data is converted from digital to analog into a baseband signal, and the IF signal generating means reproduces the IF signal of a predetermined channel from the baseband signal converted by the D / A conversion means. By generating the IF signal directly desired by the user without reproducing the RF signal from the digital data stored in the unit, the digital data stored in the memory unit can be more efficiently reproduced.

The best mode for carrying out a broadcast receiving apparatus according to an embodiment of the present invention will be described below in detail with reference to the drawings.
(First embodiment)
First, the configuration of the television broadcast receiving apparatus 100 according to the first embodiment of the present invention will be described. As shown in FIG. 1, the television broadcast receiver 100 according to the first embodiment of the present invention includes an antenna 1, a broadcast wave storage unit 2, a tuner 3, a signal selector 4, a reproduction unit 5, a main control unit 6, and An input unit 7 is provided.

  The television broadcast receiver 100 is connected to the display device 200 and the audio output device 300.

  The antenna 1 is a parabolic antenna, a UHF antenna, or the like, receives a television broadcast wave, and outputs an RF (Radio Frequency) signal to the broadcast wave storage unit 2 or the tuner 3. In the case of receiving a television broadcast wave via a CATV line, a connection cable (not shown) or the like may be provided instead of the antenna 1.

The broadcast wave storage unit 2 includes a first mixer 20, a first LPF (Low Pass Filter) 21,
The A / D conversion unit 22, the memory unit 23, the control unit 24, the D / A conversion unit 25, the second LPF 26, the second mixer 27, and the like are configured, and the antenna is set according to the control signal from the main control unit 6. 1 stores the digital data generated by performing digital-analog conversion processing on the broadcast wave received by 1 in the memory unit 23 and generates an IF signal of a channel desired by the user from the digital data stored in the memory unit 23 To do.

  The first mixer 20 includes a crystal oscillator and the like, and the RF signal input from the antenna 1 is mixed with the local oscillation frequency determined by the CPU 60 (described later) by executing the local oscillation frequency determination program 62C. A signal obtained by down-converting the frequency of the signal is generated and output to the first LPF 21. The first LPF 21 passes only a signal having a frequency equal to or lower than the cutoff frequency determined by the CPU 60 by executing the frequency determination program 62D among the signals input from the first mixer 20, and generates a baseband signal. , Output to the A / D converter 22. Thereby, the first mixer 20 and the first LPF 21 function as baseband signal generation means.

  The A / D converter 22 samples the entire band of the baseband signal input from the first LPF 21, performs analog-digital conversion, generates digital data, and outputs the digital data to the memory unit 23. Thereby, the A / D converter 22 functions as an A / D converter. Here, the sampling in the A / D converter 22 may be performed at a frequency that is twice or more the frequency of the baseband signal in consideration of the Nyquist frequency in order to prevent deterioration when the baseband signal is reproduced. desirable.

The memory unit 23 is configured by, for example, an HDD device and stores digital data input from the A / D conversion unit 22 and time information such as a time when a broadcast wave of the digital data is received. The time information is the time at which the broadcast wave of the digital data is received every predetermined unit time (for example, several tens of units), and may be added to the digital data as header information, or as a comparison table It may be added. Here, the time information may be, for example, time data based on a signal output from a clock circuit (not shown) provided in the broadcast wave storage unit 2, or the time information is included in the television broadcast wave. In such a case, the time information may be used.

  Further, when the digital data stored in the memory unit 23 is reproduced, the digital data is output to the D / A conversion unit 25.

  The control unit 24 adds time information such as the time of receiving the broadcast wave of the digital data to the digital data input from the A / D conversion unit 22 according to the control signal from the main control unit 6 to add the memory unit 23. And control of storing digital data output from the memory unit 23 to the D / A conversion unit 25, and the like.

  The D / A converter 25 converts the digital data output from the memory unit 23 from digital to analog, generates a baseband signal, and outputs the baseband signal to the second LPF 26. Thereby, the D / A converter 25 functions as a D / A converter.

  The second LPF 26 passes only a signal having a frequency equal to or lower than the cutoff frequency among the baseband signals input from the D / A conversion unit 25 and outputs the signal to the second mixer 27. The second mixer 27 includes a crystal oscillator or the like, and generates the IF signal of the channel desired by the user by mixing the local oscillation frequency of the channel desired by the user with the signal input from the second LPF 26. , Output to the signal selector 4. Thereby, the second LPF 26 and the second mixer 27 function as IF signal generation means.

The tuner 3 is an analog tuner or a digital tuner, and an IF (Intermediate Frequency) of a channel desired by the user from an RF signal input from the antenna 1.
Generate a signal. More specifically, the tuner 3 mixes the local oscillation frequency of the channel desired by the user with the input RF signal to generate an IF signal of the channel desired by the user. The IF signal generated by the tuner 3 is output to the signal selector 4.

  The tuner 3 is controlled by the CPU 60 executing a search program 62A described later, and searches the entire band of the RF signal input from the antenna 1 to search for a physical channel with a broadcast wave. Thereby, the tuner 3 functions as a part of search means.

  The signal selector 4 is connected to the tuner 3, the second mixer 27, and the like, and an IF input from the tuner 3 or the second mixer 27 based on a signal input by operating the input unit 7 by the user. One of the signals is selected and output to the reproduction unit 5.

  The reproduction unit 5 performs demodulation processing and decoding processing on the IF signal input from the signal selector 4 and outputs the IF signal to the display device 200 and the audio output device 300.

As shown in FIG. 2, the main control unit 6 includes a CPU (Central Processing Unit) 60,
A RAM (Random Access Memory) 61, a storage unit 62, and the like are provided.

  As shown in FIG. 2, the main control unit 6 includes a first mixer 20, a first LPF 21, an A / D conversion unit 22, a memory unit 23, a control unit 24, a D / A conversion unit 25, and a second LPF 26. , Second mixer 27, tuner 3, signal selector 4, reproducing unit 5, input unit 7, etc., and controls each part of the television broadcast receiving apparatus 100.

  The CPU 60 controls the entire television broadcast receiving apparatus 100 by reading out the processing program stored in the storage unit 62 and developing the processing program in the RAM 61 for execution.

  The RAM 61 expands the processing program executed by the CPU 60 in the program storage area in the RAM 61, and stores the input data and the processing result generated when the processing program is executed in the data storage area.

  The storage unit 62 includes, for example, a recording medium (not shown) in which programs, data, and the like are stored in advance, and this recording medium is configured by, for example, a semiconductor memory. In addition, the storage unit 62 stores various data, various processing programs, data processed by executing these programs, and the like for realizing a function for the CPU 60 to control the entire television broadcast receiving apparatus 100. More specifically, for example, as shown in FIG. 2, the storage unit 62 includes a search program 62A, a determination program 62B, a local oscillation frequency determination program 62C, a frequency determination program 62D, a recording program 62E, a normal broadcast program 62F, and a reproduction. A program 62G and the like are stored.

  The search program 62A is, for example, a program that realizes a function of causing the CPU 60 to control the tuner 3 to search the entire band of the RF signal input from the antenna 1 and search for a physical channel with a broadcast wave. The CPU 60 functions as part of the search means by executing the search program 62A.

  The determination program 62B has, for example, a frequency band corresponding to a predetermined number of channels and the largest number of physical channels based on a result of having the CPU 60 search the frequency band including the physical channels by executing the search program 62A. It is a program that realizes a function for determining a frequency band to be included. The frequency band for the predetermined number of channels may be a frequency band predetermined by the user, or may be a frequency band set in the television broadcast receiving apparatus 100. Further, the predetermined number of channels in the frequency band is, for example, 10 channels and is determined by the data processing speed of the A / D converter 22 and the like. The CPU 60 functions as a determination unit by executing the determination program 62B.

  The local oscillation frequency determination program 62C, for example, causes the first mixer 20 to change the antenna so that the lowest frequency becomes 0 in the frequency band corresponding to the predetermined number of channels determined by executing the determination program 62B on the CPU 60. 1 is a program for realizing a function of determining a local oscillation frequency to be mixed with an RF signal input from 1.

  In the frequency determination program 62D, for example, the first mixer 20 mixes the local oscillation frequency with the RF signal having the highest frequency in the frequency band for the predetermined number of channels determined by executing the determination program 62B in the CPU 60. This is a program that realizes a function of determining the frequency of the signal generated as a cutoff frequency of the first LPF 21.

  For example, the recording program 62E controls the first mixer 20 and the first LPF 21 to cause the CPU 60 to generate a predetermined baseband signal from the RF signal input from the antenna 1, and causes the A / D converter 22 to operate. This is a program for controlling and converting a baseband signal into digital data and realizing a function of storing the digital data in the memory unit 23.

  The normal broadcast program 62F, for example, causes the CPU 60 to control the tuner 3 to generate an IF signal of a channel desired by the user from the RF signal input from the antenna 1, and controls the signal selector 4 to Video signals and audio signals obtained by causing the reproduction unit 5 to output and controlling the reproduction unit 5 to perform demodulation processing on the IF signal input from the signal selector 4 respectively. This is a program for realizing a function of outputting to the display device 200 and the audio output device 300.

  The reproduction program 62G, for example, causes the CPU 60 to control the control unit 24 to output digital data of the broadcast time of a program desired by the user from the memory unit 23 to the D / A conversion unit 25. , The digital data output from the memory unit 23 is converted from digital to analog to generate a baseband signal, the second LPF 26 is controlled, and the baseband signal input from the D / A conversion unit 25 is controlled. Of these, only the signal below the cut-off frequency is output to the second mixer 27, the second mixer 27 is controlled by adjusting the local oscillation frequency, and the signal input from the second LPF 26 is desired by the user. The IF signal, and the signal selector 4 is controlled to output the RF signal input from the second mixer 27 to the reproduction unit 5. Thus, a function of outputting a video signal and an audio signal obtained by performing a demodulation process or the like to the IF signal input from the signal selector 4 to the display device 200 and the audio output device 300 is realized. It is a program.

  The input unit 7 includes keys and the like for inputting input signals related to various operations to the television broadcast receiving apparatus 100. When operated by the user, input signals for various operations are input to the television broadcast receiving apparatus 100. The The input unit 7 also includes a selection key (not shown) for the user to select a program stored in the memory unit 23.

  Next, the operation of the television broadcast receiving apparatus 100 according to the first embodiment of the present invention configured as described above will be described with reference to the flowcharts shown in FIGS.

  First, regarding the operation from the reception of the television broadcast wave of the television broadcast receiving apparatus 100 to the storage of the digital data in the memory unit 23, the physical channel in the frequency band of the television broadcast wave shown in FIG. This will be described with reference to a distribution diagram of frequency bands including

  First, by executing the determination program 62B, the CPU 60 executes the search program 62A to cause the tuner 3 to search the frequency band including the physical channel. Then, the frequency band including the most physical channels is determined (step S1).

  Specifically, for example, as shown in FIG. 4, as a result of searching the tuner 3 for physical channels with broadcast waves, the physical channels with broadcast waves are 17 channels, 20 to 22 channels, 24 to 27 channels, 29 In the case of 30 channels, if the predetermined number of channels is 10 and the frequency bands A, B, and C for 10 channels are 17 to 26 channels, 20 to 29 channels, and 23 to 32 channels, respectively, the frequency bands A, B, and C include 7, 8, and 6, respectively, physical channels with broadcast waves. Then, the CPU 60 executes the determination program 62B, so that the frequency band B including the most physical channels in the frequency bands A, B, and C is determined to be the frequency band B.

  Next, the CPU 60 executes the local oscillation frequency determination program 62C by executing the recording program 62E so that the lowest frequency becomes 0 in the frequency band for the predetermined number of channels determined in step S1. The first mixer 20 determines a local oscillation frequency to be mixed with the RF signal input from the antenna 1 (step S2).

  Next, the CPU 60 controls the first mixer 20 to mix the local oscillation frequency determined in step S2 with the RF signal input from the antenna 1, thereby down-converting the frequency of the RF signal. A signal is generated (step S3).

Next, the CPU 60 executes the frequency determination program 62D, so that the first mixer 20 mixes the local oscillation frequency with the highest frequency RF signal in the frequency band for the predetermined number of channels determined in step S1. The frequency of the signal generated by doing so is determined as the cutoff frequency of the first LPF 21 (step S4).

  Next, the CPU 60 controls the first LPF 21 to pass only a signal having a frequency equal to or lower than the cutoff frequency determined in step S <b> 4 among the signals input from the first mixer 20. Generate (step S5).

  Next, the CPU 60 controls the A / D converter 22 to sample the entire band of the baseband signal input from the first LPF 21 at a frequency that is twice or more the frequency of the baseband signal. Conversion is performed to generate digital data (step S6).

  Next, the CPU 60 controls the control unit 24 to store the digital data input from the A / D conversion unit 22 and time information such as the time when the broadcast wave of the digital data is received in the memory unit 23. (Step S7).

  Next, operations of outputting a broadcast currently received by the television broadcast receiving apparatus 100 and outputting data stored in the memory unit 23 will be described with reference to a flowchart shown in FIG.

  First, the CPU 60 controls the tuner 3 by executing the normal broadcast program 62F, and mixes the local oscillation frequency of the channel selected by the user operating the input unit 7 to the RF signal input from the antenna 1. The IF signal is generated, the signal selector 4 is controlled, the IF signal input from the tuner 3 is output to the playback unit 5, the playback unit 5 is controlled, and the IF signal input from the signal selector 4 Are output to the display device 200 and the audio output device 300 respectively (step S101).

  Next, the CPU 60 determines whether or not the user has selected a program stored in the memory unit 23 based on the presence / absence of a selection signal input when the user presses a selection key (not shown) of the input unit 7. Judgment is made (step S102).

  In step S102, when the CPU 60 determines that the selection signal is not input from the input unit 7 (step S102; Yes), the process returns to step S101.

  On the other hand, when the CPU 60 determines in step S102 that a selection signal has been input from the input unit 7 (step S102; No), the CPU 60 controls the control unit 24 by executing the reproduction program 62G. The digital data of the broadcast time of the program desired by the user is output from the memory unit 23 to the D / A conversion unit 25, the D / A conversion unit 25 is controlled, and the digital data output from the memory unit 23 is converted to digital analog A baseband signal is generated by conversion (step S103).

  Next, the CPU 60 controls the second LPF 26 to pass only a signal having a frequency equal to or lower than the cutoff frequency among the baseband signals generated by the D / A converter 25 and outputs the signal to the second mixer 27. (Step S104).

  Next, the CPU 60 controls the second mixer 27 and mixes the input baseband signal with the local oscillation frequency for generating the IF signal of the channel desired by the user, so that the channel desired by the user can be obtained. IF signal is generated (step S105).

Next, the CPU 60 controls the signal selector 4 to output the IF signal input from the second mixer 27 to the reproduction unit 5 (step S106).

  Next, the CPU 60 controls the playback unit 5 so that a video signal and an audio signal obtained by performing demodulation processing and the like on the IF signal input from the signal selector 4 are displayed on the display device 200 and the audio, respectively. The output is made to the output device 300 (step S107).

  According to the television broadcast receiving apparatus 100 according to the first embodiment described above, the CPU 60 executes the determination program 62B, whereby a predetermined range of frequency bands in the RF signal of the television broadcast wave is determined. The first mixer 20 and the first LPF 21 generate a baseband signal corresponding to the frequency band determined by executing the determination program 62B from the RF signal, and the A / D conversion unit 22 The baseband signal generated by the mixer 20 and the first LPF 21 is converted from analog to digital, and the digital data converted by the A / D converter 22 is stored in the memory unit 23. Therefore, the RF signal of the television broadcast wave is stored. Is converted to an IF signal by the tuner and stored in the memory unit 23 without being demodulated. Thus, even if the tuner 3 is not provided for each channel, the RF signal in a predetermined frequency band determined by the CPU 60 executing the determination program 62B can be converted from analog to digital and stored in the memory unit 23. .

  In addition, since the CPU 60 executes the determination program 62B, the frequency band within a predetermined range of the RF signal to be analog-digital converted and stored in the memory unit 23 is determined, so that the amount of data to be analog-digital converted per unit time is suppressed. Therefore, the television broadcast wave data can be efficiently stored in the memory unit 23.

  Further, when the CPU 60 executes the determination program 62B, the search program 62A is executed to control the tuner 3, and based on the physical channel with the broadcast wave searched for, the frequency band range corresponding to the predetermined number of channels. Thus, since the frequency band with the largest number of physical channels with broadcast waves is determined as the frequency band within the predetermined range, the data of the physical channel on which the program is broadcast can be efficiently stored in the memory unit 23.

  Further, the digital data stored in the memory unit 23 is converted from digital to analog by the D / A conversion unit 25 into a baseband signal, and the second LPF 26 and the second mixer 27 perform the D / A conversion unit 25. Since the IF signal of the predetermined channel is reproduced from the converted baseband signal, the IF signal of the channel desired by the user is directly generated without generating the RF signal from the digital data stored in the memory unit 23. Thus, the digital data stored in the memory unit 23 can be reproduced more efficiently.

In the first embodiment, when the CPU 60 executes the determination program 62B, the frequency band corresponding to the predetermined number of channels and the frequency band including the most physical channels with broadcast waves is determined. However, any frequency band may be used as long as it corresponds to the predetermined number of channels. For example, a frequency band including the most channels of programs that are frequently viewed by the user may be set as the frequency band corresponding to the predetermined number of channels.
(Second Embodiment)
Next, the best mode for carrying out the television broadcast receiving apparatus 400 according to the second embodiment of the present invention will be described in detail.

  In the television broadcast receiver 400 according to the second embodiment, as shown in FIG. 6, only the configuration of the input unit 71 and the storage unit 63 is different from the television broadcast receiver 100 of the first embodiment. The same components as those of the television broadcast receiver 100 according to the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

The input unit 71 includes a key for inputting input signals related to various operations to the television broadcast receiving apparatus 400, a selection key (not shown) for selecting a program stored in the memory unit 23, and the like. As a result, input signals for various operations are input to the television broadcast receiver 400. The input unit 71 includes a key (not shown) for inputting a keyword related to a program desired by the user, and functions as an input unit.

  The storage unit 63 includes, for example, a recording medium (not shown) in which programs, data, and the like are stored in advance, and this recording medium is configured by, for example, a semiconductor memory. In addition, the storage unit 63 stores various data, various processing programs, data processed by executing these programs, and the like for realizing a function for the CPU 60 to control the entire television broadcast receiving apparatus 400. More specifically, for example, as shown in FIG. 2, the storage unit 63 stores an EPG data file 63A, keyword data 63B, a search program 63C, a determination program 63D, a local oscillation frequency determination program 62C, a frequency determination program 62D, a recording A program 62E, a normal broadcast program 62F, a reproduction program 62G, and the like are stored.

  The EPG data file 63A stores EPG (Electric Program Guide) data multiplexed and transmitted on a television broadcast wave. The EPG data includes data such as a program title, performer name, channel number, and broadcast time. The storage unit 63 functions as a storage unit by storing the EPG data file 63A.

  The keyword data 63 </ b> B is keyword information regarding a program that the user wants to watch, which is input by operating the input unit 71. The keyword includes a program title, performer name, and the like.

  The search program 63C, for example, extracts a program including the keyword stored in the keyword data 63B by referring to the EPG data file 63A, and controls the tuner 3 so that the RF signal input from the antenna 1 is retrieved. Is a program that realizes a function of searching for the entire frequency band and searching for the frequency band of the physical channel on which the program is broadcast. The CPU 60 functions as part of the search means by executing the search program 63C.

  The determination program 63D executes, for example, the CPU 60 by executing the search program 63C to control the tuner 3 to search the frequency band of the physical channel on which the program including the keyword is broadcast. This is a program that realizes a function of determining a frequency band that has a frequency band of several minutes and includes the most physical channels on which the program is broadcast. The frequency band for the predetermined number of channels may be a frequency band determined in advance by the user, or may be a frequency band set in the television broadcast receiving apparatus 400. Further, the predetermined number of channels in the frequency band is, for example, 10 channels and is determined by the data processing speed of the A / D converter 22 and the like. The CPU 60 functions as a determination unit by executing the determination program 63D.

  Next, the operation from the reception of the television broadcast wave to the storage of the digital data in the memory unit 23 of the television broadcast receiver 400 according to the second embodiment of the present invention having the above-described configuration is shown in FIG. This will be described with reference to the flowchart shown.

  First, the CPU 60 executes the search program 63C to extract a program including a keyword input by the user and stored in the keyword data 63B by referring to the EPG data file 63A, and controls the tuner 3. Then, the entire band of the RF signal input from the antenna 1 is searched, and the frequency band of the physical channel on which the program is broadcast is searched (step S201).

  Next, the CPU 60 executes the determination program 63D, thereby executing the search program 63C to control the tuner 3 to search the frequency band of the physical channel on which the program including the keyword is broadcasted. A frequency band corresponding to a predetermined number of channels and including the most physical channels on which the program is broadcast is determined (step S202).

  Next, the CPU 60 executes the local oscillation frequency determination program 62C by executing the recording program 62E so that the lowest frequency becomes 0 in the frequency band for the predetermined number of channels determined in step S202. The first mixer 20 determines a local oscillation frequency to be mixed with the RF signal input from the antenna 1 (step S203).

  Next, the CPU 60 controls the first mixer 20 to mix the local oscillation frequency determined in step S203 with the RF signal input from the antenna 1, thereby down-converting the frequency of the RF signal. A signal is generated (step S204).

  Next, the CPU 60 executes the frequency determination program 62D so that the first mixer 20 mixes the local oscillation frequency with the highest frequency RF signal in the frequency band for the predetermined number of channels determined in step S202. The frequency of the signal generated by doing so is determined as the cutoff frequency of the first LPF 21 (step S205).

  Next, the CPU 60 controls the first LPF 21 to pass only a signal having a frequency equal to or lower than the cutoff frequency determined in step S <b> 205 among the signals input from the first mixer 20, and transmits a baseband signal. Generate (step S206).

  Next, the CPU 60 controls the A / D converter 22 to sample the entire band of the baseband signal input from the first LPF 21 at a frequency that is twice or more the frequency of the baseband signal. Conversion is performed to generate digital data (step S207).

  Next, the CPU 60 controls the control unit 24 to store the digital data input from the A / D conversion unit 22 and time information such as the time when the broadcast wave of the digital data is received in the memory unit 23. (Step S208).

According to the television broadcast receiving apparatus 400 according to the second embodiment described above, the same effects as those of the television broadcast receiving apparatus 400 according to the first embodiment can be obtained. By executing the determination program 63D, the search program 63C is executed to control the tuner 3, and the frequency band range corresponding to the predetermined number of channels is based on the physical channel on which the program including the searched keyword is broadcast. Since the frequency band with the largest number of physical channels on which the program containing the keyword is broadcast is determined as the predetermined frequency band, the data on the physical channel on which the program containing the keyword related to the program that the user wants to watch is efficiently transmitted. It can be well stored in the memory unit 23.
(Third embodiment)
Next, the best mode for carrying out the television broadcast receiving apparatus 500 according to the third embodiment of the present invention will be described in detail.

In the television broadcast receiving apparatus 500 according to the third embodiment, as shown in FIG. 8, the first mixer 20A, the first mixer 20B, and the first LPF (Low Pass Filter) 21A.
Since only the configuration of the first LPF 21B, the A / D conversion units 22A and 22B, the storage unit 64, and the like is different from the television broadcast receiving device 100 of the first embodiment, the television broadcast receiving device of the first embodiment. The same reference numerals are given to the same components as 100, and the description thereof is omitted.

The broadcast wave storage unit 2 includes first mixers 20A and 20B, first LPFs (Low Pass Filters) 21A and 21B, A / D conversion units 22A and 22B, a memory unit 23, a control unit 24, and D / A.
A conversion unit 25, a second LPF 26, a second mixer 27, and the like are configured, and are generated by performing a digital / analog conversion process or the like on a broadcast wave received by the antenna 1 in accordance with a control signal from the main control unit 6. The digital data stored in the memory unit 23 and the IF signal of the channel desired by the user are generated from the digital data stored in the memory unit 23.

  The first mixer 20A and the first mixer 20B include a crystal oscillator or the like, and the local oscillation frequency determined by the CPU 60 described later by executing the local oscillation frequency determination program 64C is applied to the RF signal input from the antenna 1. By mixing, a signal obtained by down-converting the frequency of the RF signal is generated and output to the first LPF 21A and the first LPF 21B. The first LPF 21A and the first LPF 21B are signals having a frequency equal to or lower than the cutoff frequency determined by the CPU 60 by executing the frequency determination program 64D among the signals input from the first mixer 20A and the first mixer 20B. Only the baseband signal is generated, and a baseband signal is generated and output to the A / D converters 22A and 22B.

  The A / D conversion unit 22A and the A / D conversion unit 22B sample the entire band of the baseband signal input from the first LPF 21A or the first LPF 21B, generate analog data by digital conversion, and generate digital data. To the unit 23. Here, the sampling in the A / D converters 22A and 22B is performed at a frequency that is at least twice the frequency of the baseband signal in consideration of the Nyquist frequency in order to prevent deterioration when the baseband signal is reproduced. It is desirable.

  The storage unit 64 includes, for example, a recording medium (not shown) in which programs, data, and the like are stored in advance, and this recording medium is configured by, for example, a semiconductor memory. In addition, the storage unit 64 stores various data, various processing programs, data processed by executing these programs, and the like for realizing a function for the CPU 60 to control the entire television broadcast receiving apparatus 500. More specifically, for example, as shown in FIG. 9, the storage unit 64 includes a search program 62A, a determination program 64B, a local oscillation frequency determination program 64C, a frequency determination program 64D, a recording program 64E, a normal broadcast program 62F, and a reproduction. A program 62G and the like are stored.

  The determination program 64B has, for example, a frequency band corresponding to a predetermined number of channels and the largest number of physical channels based on a result of having the CPU 60 search the frequency band including the physical channels by executing the search program 62A. This is a program for realizing a function of determining a frequency band including a frequency band including a predetermined number of channels and a frequency band including the second most physical channels. The frequency band for the predetermined number of channels may be a frequency band predetermined by the user or may be a frequency band set in the television broadcast receiving apparatus 500. The predetermined number of channels in the frequency band is, for example, 5 channels and is determined by the data processing speed of the A / D conversion units 22A and 22B. The CPU 60 functions as a determination unit by executing the determination program 64B.

The local oscillation frequency determination program 64C is, for example, a frequency band corresponding to the predetermined number of channels determined by executing the determination program 64B in the CPU 60, and the frequency band including the most physical channels, with the lowest frequency being 0. The first mixer 2
0A determines the local oscillation frequency to be mixed with the RF signal input from the antenna 1, and includes the second largest number of physical channels in the frequency band corresponding to the predetermined number of channels determined by executing the determination program 64B. This is a program for realizing a function of determining a local oscillation frequency to be mixed with the RF signal input from the antenna 1 by the first mixer 20B so that the lowest frequency becomes 0 in the frequency band.

  For example, the frequency determination program 64D has the frequency band corresponding to the predetermined number of channels determined by executing the determination program 64B in the CPU 60, and the highest frequency RF signal in the frequency band including the most physical channels. 1 mixer 20A determines the frequency of the signal generated by mixing the local oscillation frequency as the cutoff frequency of the first LPF 21A, and the frequency for a predetermined number of channels determined by executing the determination program 64B The frequency of the signal generated by the first mixer 20B mixing the local oscillation frequency with the highest frequency RF signal in the frequency band that includes the second most physical channel and the frequency of the first LPF 21B. A program that realizes the function to determine the cut-off frequency It is.

  The recording program 64E controls, for example, the first mixer 20A, the first mixer 20B, the first LPF 21A, and the first LPF 21B to the CPU 60, so that a predetermined baseband signal is obtained from the RF signal input from the antenna 1. And the A / D converters 22A and 22B are controlled to convert the baseband signal into digital data, and the control unit 24 is controlled to detect the time when the digital data broadcast wave is received. This is a program for realizing a function of adding time information and storing it in the memory unit 23.

  Next, the operation from the reception of the television broadcast wave to the storage of the digital data in the memory unit 23 of the television broadcast receiving apparatus 500 according to the third embodiment of the present invention having the above-described configuration is shown in FIG. This will be described with reference to the flowchart shown.

  First, by executing the determination program 64B, the CPU 60 executes the search program 62A to cause the tuner 3 to search the frequency band including the physical channel, so that there are frequency bands for a predetermined number of channels. The frequency band including the most physical channels and the frequency band corresponding to the predetermined number of channels and the frequency band including the second most physical channels are determined (step S301).

  Next, the CPU 60 executes the local oscillation frequency determination program 64C by executing the recording program 64E so that the lowest frequency becomes 0 in the frequency band for the predetermined number of channels determined in step S301. In addition, the local oscillation frequency that the first mixer 20A mixes with the RF signal input from the antenna 1 and the local oscillation frequency that the first mixer 20B mixes with the RF signal input from the antenna 1 are determined (step). S302).

  Next, the CPU 60 controls the first mixer 20A and the first mixer 20B to mix the RF signal input from the antenna 1 with the local oscillation frequency determined in step S302, thereby generating the RF signal. A signal whose frequency is down-converted is generated (step S303).

Next, the CPU 60 executes the frequency determination program 64D to obtain the highest frequency RF signal in the frequency band corresponding to the predetermined number of channels determined in step S301 and including the most physical channels. The frequency of the signal generated by the first mixer 20A mixing the local oscillation frequency is determined as the cutoff frequency of the first LPF 21A, and the frequency band is equal to the predetermined number of channels determined in step S301. The frequency of the signal generated by the first mixer 20B mixing the local oscillation frequency with the highest frequency RF signal in the frequency band containing the second most physical channels is used as the cutoff frequency of the first LPF 21B. Determine (step S304).

  Next, the CPU 60 controls the first LPF 21A and the first LPF 21B so that the signals input from the first mixer 20A and the first mixer 20B are equal to or lower than the cutoff frequency determined in step S304, respectively. Only the signal of the frequency of is passed and a baseband signal is produced | generated (step S305).

  Next, the CPU 60 controls the A / D converters 22A and 22B so that the entire band of the baseband signal input from the first LPF 21A and the first LPF 21B is equal to or more than twice the frequency of the baseband signal. Sampling is performed at a frequency and analog-digital conversion is performed to generate digital data (step S306).

  Next, the CPU 60 controls the control unit 24 to store the digital data input from the A / D conversion units 22A and 22B and the time information such as the time when the broadcast wave of the digital data is received in the memory unit 23. Store (step S307).

  According to the television broadcast receiving apparatus 500 according to the third embodiment described above, the same effects as those of the television broadcast receiving apparatus 500 according to the first embodiment can be obtained. By executing the determination program 64B, the broadcast wave is transmitted within the frequency band range of a predetermined number of channels based on the physical channel with the broadcast wave searched by executing the search program 62A and controlling the tuner 3. The frequency band with the largest number of physical channels is not only determined as the frequency band of the predetermined range, but the frequency band with the second largest number of physical channels with broadcast waves is predetermined within the frequency band range of the predetermined number of channels. Since it is determined as the frequency band of the range, for example, in the entire band of the RF signal of the broadcast wave, In the case where Le is often frequency bands are divided also can store data channel if the program is being broadcast efficiently memory unit 23.

  In the third embodiment, when the CPU 60 executes the determination program 64B, the frequency band corresponding to the predetermined number of channels and the frequency band including the most physical channels with broadcast waves, and the predetermined number of channels. However, any frequency band corresponding to a predetermined number of channels may be used, for example, a user's frequency band. A frequency band that includes the most channels of programs that are frequently viewed, and a frequency band that is the frequency band corresponding to a predetermined number of channels and that includes the second most frequent channels of programs that are frequently viewed by the user, respectively. The frequency band may be equal to the number of channels.

  In the third embodiment, the broadcast wave storage unit 2 includes two each of the first mixer and the first LPF. However, the broadcast mixer 2 includes three or more first mixers and first LPFs. May be.

It is a block diagram which shows the principal part structure of the television broadcast receiver which concerns on the 1st Embodiment of this invention. It is a block diagram explaining the relationship between the main control part which concerns on the 1st Embodiment of this invention, and each part. It is a flowchart explaining operation | movement of the television broadcast receiver which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of distribution of the frequency band containing the physical channel in the frequency band of a television broadcast wave. It is a flowchart explaining operation | movement of the television broadcast receiver which concerns on the 1st Embodiment of this invention. It is a block diagram explaining the relationship between the main control part which concerns on the 2nd Embodiment of this invention, and each part. It is a flowchart explaining operation | movement of the television broadcast receiver which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the principal part structure of the television broadcast receiver which concerns on the 3rd Embodiment of this invention. It is a block diagram explaining the relationship between the main control part which concerns on the 3rd Embodiment of this invention, and each part. It is a flowchart explaining operation | movement of the television broadcast receiver which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

20, 20A, 20B First mixer (baseband signal generating means)
21, 21A, 21B First LPF (baseband signal generating means)
22, 22A, 22B A / D converter (A / D converter)
23 Memory unit 25 D / A conversion unit (D / A conversion means)
26 Second LPF (IF signal generating means)
27 Second mixer (IF signal generating means)
3 Tuner (search means)
60 CPU (search means, determination means, local oscillation frequency determination means)
62A, 63C Search program (search means)
62B, 63D, 64B determination program (determination means)
62C, 64C Local oscillation frequency determination program (local oscillation frequency determination means)
7,71 Input section (input means)
100, 400, 500 Television broadcast receiver (television broadcast receiver)

Claims (5)

Determining means for determining a predetermined frequency band in the RF signal of the television broadcast wave;
Baseband signal generation means for generating a baseband signal corresponding to the frequency band determined by the determination means from the RF signal;
A / D conversion means for analog-digital conversion of the baseband signal generated by the baseband signal generation means;
A memory unit for storing digital data converted by the A / D conversion unit;
D / A conversion means for converting the digital data stored in the memory section into a baseband signal by digital-analog conversion;
IF signal generation means for generating an IF signal of a predetermined channel from the baseband signal converted by the D / A conversion means;
Search means for searching for physical channels with broadcast waves,
The determining means includes
Based on the physical channels with broadcast waves searched by the search means, the frequency band with the largest number of physical channels with broadcast waves is determined as the frequency band of the predetermined range within the frequency band range for a predetermined number of channels. A television broadcast receiver characterized by the above. Determining means for determining a predetermined frequency band in the RF signal of the television broadcast wave;
Baseband signal generation means for generating a baseband signal corresponding to the frequency band determined by the determination means from the RF signal;
A / D conversion means for analog-digital conversion of the baseband signal generated by the baseband signal generation means;
A memory unit for storing digital data converted by the A / D conversion unit;
A television broadcast receiving apparatus comprising: A search means for searching for physical channels with broadcast waves is provided.
The determining means includes
Based on the physical channels with broadcast waves searched by the search means, the frequency band with the largest number of physical channels with broadcast waves is determined as the frequency band of the predetermined range within the frequency band range for a predetermined number of channels. The television broadcast receiver according to claim 2. Input means for entering keywords;
Storage means for storing EPG data included in the broadcast wave;
Search means for extracting a program including the keyword input by the input means with reference to the storage means, and searching for a physical channel on which the program is broadcast,
The determining means is a physical channel on which the program including the keyword is broadcast within a frequency band range of a predetermined number of channels based on the physical channel on which the program including the keyword searched by the search means is broadcast. The television broadcast receiver according to claim 2, wherein a frequency band having the largest number is determined as the frequency band of the predetermined range. D / A conversion means for converting the digital data stored in the memory section into a baseband signal by digital-analog conversion;
IF signal generation means for generating an IF signal of a predetermined channel from the baseband signal converted by the D / A conversion means;
The television broadcast receiver according to any one of claims 2 to 4, further comprising:

Images