JP4226314B2 - Terrestrial digital broadcast receiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a terrestrial digital broadcast receiving apparatus that receives terrestrial digital broadcast signals and acquires program information such as broadcast station names, broadcast contents, and broadcast schedules of all programs that can be viewed.
[0002]
[Prior art]
In non-terrestrial digital broadcasting represented by BS digital broadcasting, CS digital broadcasting, and CATV (cable television), which has recently been started, the name of the broadcasting station where the non-terrestrial digital broadcasting is performed, the broadcast content, and Non-terrestrial digital broadcast signals to which program information such as broadcast schedules are added are distributed. Specifically, program information added to a non-terrestrial digital broadcast signal distributed from one broadcast station (channel) includes not only the broadcast station but also other broadcasts that perform non-terrestrial digital broadcasts. Program information related to a program provided by a station (channel) is also included (see, for example, Patent Document 1).
[0003]
As a result, if a non-terrestrial digital broadcast signal distributed from one broadcast station is received, non-terrestrial digital broadcast signals distributed from all broadcast stations can be obtained from the program information added to the received non-terrestrial digital broadcast signal. You can know program information about digital wave broadcasting. In this way, in non-terrestrial digital broadcasting, in a short time required to receive a non-terrestrial digital broadcast signal distributed from one broadcasting station, it depends on a medium other than the broadcast signal such as a program guide such as a magazine. Even without it, program information of programs provided from all non-terrestrial digital broadcasting stations can be acquired.
[0004]
Therefore, before receiving the next non-terrestrial digital broadcast signal distributed from another broadcast station, the program information of that broadcast station has already been acquired. Then, when a non-terrestrial digital broadcast signal distributed from another broadcast station is received next, the already acquired program information is automatically updated to the latest one. Therefore, a viewer who is a user refers to the program information of each broadcasting station acquired in advance in this way, and can select a favorite one of all programs distributed in non-terrestrial digital broadcasting. You can easily select and watch.
[0005]
[Patent Document 1]
JP 2002-112205 A
[0006]
[Problems to be solved by the invention]
However, in terrestrial digital broadcasting that is scheduled to start soon, only program information related to programs provided by the broadcast station is added to the terrestrial digital broadcast wave distributed from one broadcast station. Therefore, in order to acquire program information in terrestrial digital broadcasting, unlike non-terrestrial digital broadcasting, viewers obtain program information provided by all broadcast stations that have the possibility of viewing. Must.
[0007]
In other words, in order to know whether or not a certain broadcast station provides a favorite program, first, a terrestrial digital broadcast signal distributed from the broadcast station must be received. Then, referring to the program information acquired in units of broadcast stations, if a favorite program is not provided from the broadcast station, an act of receiving a terrestrial digital broadcast signal distributed from another broadcast station is performed. It must be executed for each broadcasting station or for every worst broadcasting station. Such an action is time consuming and very annoying.
[0008]
In order to avoid the cumbersome act of receiving from all terrestrial digital broadcasting stations in advance in order to obtain program information about programs provided as a whole of terrestrial digital broadcasting, program guides such as magazines You must rely on media other than broadcast signals. However, in terrestrial digital broadcasting, labor and cost burden for obtaining unnecessary program guides are not preferable.
[0009]
In addition, when program information is presented on a television screen on which a terrestrial digital broadcast program is actually displayed, the program information is more visible than when the program information is displayed at a position away from the screen, such as a program guide. From the viewpoint of this, it is preferable. This problem is particularly noticeable in applications in which terrestrial digital broadcasting is viewed with a television receiver installed in a moving body such as a car. Basically, it is not preferable for the driver to operate the television while driving a car, but it is much more preferable to operate a remote controller or the like than to view a program guide while the driver is driving.
[0010]
The number and channels of broadcasting stations that carry out terrestrial digital broadcasting vary from broadcasting area to broadcasting area. Therefore, when a car moves to another broadcasting area, it is necessary to purchase a program guide corresponding to that area. Similarly, when a viewer actually receives a digital terrestrial broadcast and acquires program information of the station, the program information cannot be acquired unless the broadcast station and the channel existing in the area are known. Therefore, in the terrestrial digital broadcasting, the present invention acquires in advance terrestrial program information related to programs provided from all broadcast stations that can be viewed, and the terrestrial wave that is convenient for the viewer to select a viewing program. An object is to provide a digital broadcast receiving apparatus.
[0011]
[Means for Solving the Problems and Effects of the Invention]
A first invention is a terrestrial digital broadcast receiving apparatus that receives terrestrial digital broadcast waves in which a plurality of broadcast channels are set at predetermined frequency intervals and acquires program information,
A receiving channel detecting means for detecting a receivable broadcasting channel among a plurality of broadcasting channels;
Channel information generating means for generating channel information defining receivable broadcast channels;
A terrestrial digital broadcast receiver comprising: program information acquisition means for acquiring program information from a terrestrial digital broadcast wave transmitted on a receivable broadcast channel.
[0012]
As described above, in the first invention, program information of all channels can be automatically acquired in terrestrial digital broadcasting in which only the program information of that channel is added to the broadcast wave of one channel.
[0013]
According to a second aspect, in the first aspect, the channel information includes a channel number of a reception channel and a broadcasting station ID indicating a broadcasting station.
[0014]
According to a third aspect, in the second aspect, the channel information further includes already detected information indicating whether or not the received channel has been detected in the past.
[0015]
As described above, in the third aspect of the invention, even when the terrestrial digital broadcast receiving device is mounted on a mobile body or the like, even if the receiving environment changes, program information of programs that can be received according to the change in the environment is acquired. it can.
[0016]
In a fourth aspect based on the first to third aspects, the reception channel detecting means is
Lock detection means for performing demodulation lock detection in order from a broadcast channel set to a predetermined frequency among a plurality of broadcast channels;
Frame synchronization detection means for performing frame synchronization detection on a broadcast channel in which demodulation lock is detected;
Receiving channel determining means for detecting a broadcast channel in which frame synchronization is detected as a receivable broadcast channel;
If the demodulation lock is not detected, the demodulation lock is detected but the frame synchronization is not detected for frequencies other than the frequency set for the reception channel, which is formed over a predetermined frequency band centered on the receivable broadcast channel. The first lock control means controls the lock detection means so as to perform the demodulation lock detection for the broadcast channels separated by the number of broadcast channels corresponding to half the number of channels excluding the reception channels from the broadcast channels in the occupied band included in the occupied bands. The lock detection control means is provided.
[0017]
As described above, in the fourth invention, program information can be acquired more efficiently.
[0018]
According to a fifth aspect of the present invention, in the first to third aspects of the present invention, the reception channel detection means locks so that demodulation lock detection is performed on broadcast channels separated by the number of one broadcast channel when frame synchronization is not detected. Second lock detection control means for controlling the detection means is provided.
[0019]
As described above, the fifth invention has the same effect as the fourth invention.
[0020]
In a sixth aspect based on the first to third aspects, the reception channel detection means comprises:
When frame synchronization is detected, the lock detection means is controlled so that demodulation lock detection is performed for broadcast channels separated by the number of channels corresponding to the minimum reception channel interval between two adjacent reception channels. Third lock detection control means is provided.
[0021]
As described above, the sixth invention has the same effects as the fourth invention.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
In terrestrial digital broadcasting, different modulation schemes are adopted in countries around the world. For example, the OFDM scheme is adopted in Japan and Europe, and the 8VSB scheme is adopted in the United States. Digital terrestrial broadcast waves are a fixed reception mode for viewing on a television receiver installed at home, a mobile reception mode for viewing while moving on a mobile terminal or a vehicle-mounted terminal, and carrier intervals assuming various reception environments. Three different types of transmission modes are set. As the carrier modulation scheme, the 16QAM scheme and the 64QAM scheme are used for the fixed reception mode, and the DQPSK scheme and the QPSK scheme are used for the mobile reception mode. In this specification, the OFDM system and the QPSK system adopted in Japan will be described as an example, but it goes without saying that the same applies to other modulation systems.
[0023]
The terrestrial digital broadcast receiver according to the present invention receives terrestrial digital broadcast signals distributed from different broadcast stations for different channels. In this sense, a broadcast station is identified as a broadcast channel. Therefore, in the present specification, hereinafter, each broadcast station that distributes a terrestrial digital broadcast signal is referred to as a broadcast channel unless it is particularly necessary to distinguish between them.
[0024]
Further, in the present invention, as a result of movement of a vehicle or the like equipped with a terrestrial digital broadcast receiver, the channel that can be received changes, or a broadcast channel is added by opening a new broadcast station (or vice versa). The purpose is to acquire all program information of terrestrial digital broadcasts distributed from all broadcast channels (broadcast stations) that can be viewed. Therefore, the reception of the terrestrial digital broadcast signal from the broadcast station is confirmed in the broadcast channel (broadcastable channel BC) that can be broadcast by the broadcast station in all bands of the terrestrial digital broadcast.
[0025]
With reference to FIG. 4, a broadcast channel reception confirmation method according to the present invention will be briefly described. As an example, a relationship between a broadcast channel of a digital broadcast wave having a plurality of channels and a frequency distribution in the L band frequency band (1453.384 to 1490.644 MHz) is shown. A digital broadcast wave is a multiplexed signal that multiplexes a plurality of digitized broadcast information such as music, broadcast identification information, additional information, etc., in a time-series manner, generally called a frame. Is a broadcast wave having a predetermined signal bandwidth obtained by performing digital modulation (in the present invention, QPSK modulation: quaternary phase modulation) on a predetermined carrier wave arranged in the L band band. Broadcast identification information is information used to separate broadcast information from broadcast waves, and additional information is information for obtaining frame synchronization.
[0026]
In the figure, fmin and fmax represent the minimum frequency and the maximum frequency of the frequency band of the broadcast wave, respectively. A circle indicates a broadcastable channel BC that is allocated in advance for each predetermined frequency interval fΔ in the frequency band of the broadcast wave. ● indicates a reception channel Rc in which a radio wave is actually broadcast and is in a receivable state among a plurality of broadcast possible channels BC indicated by ○. The reception channel Rc is also a broadcastable channel BC. That is, one broadcast frequency band includes Nmax broadcastable channels BC expressed by the following equation (1).
Nmax = ROUND ((fmax−fmin) / fΔ) +1 (1) ROUND () is a function that rounds off numbers in parentheses to round to an integer value.
[0027]
The reception channel Rc is included in the broadcast wave by detecting the lock when demodulating the broadcast wave, for example, QPSK lock detection, and actually detecting the frame synchronization at the frequency assigned to the channel. Information can be retrieved. In the example of the figure, the two channels Rc are actually reception channels that receive broadcast waves.
[0028]
Even if the frequency is not the frequency of the reception channel Rc within the frequency band having the predetermined frequency width fw centering on each of the reception channels Rc, the broadcast wave can be demodulated to detect the lock, but the frame synchronization cannot be detected. An occupied band FW is formed. In other words, all broadcastable channels BC included in the occupied band FW are detected as locked, but frame synchronization is detected only for the receiving channel Rc. In this sense, from the viewpoint of lock detection, the broadcastable channel BC in the occupied band is a reception channel candidate having a possibility of being the reception channel Rc. That is, in one occupied band FW, there are broadcastable channels BC (including reception channels Rc) that can be Nw reception channels represented by the following equation (2).
Nw = ROUND (fw / fΔ−0.5) (2)
[0029]
Since one occupied band FW includes one reception channel Rc, it can be understood that Nw−1 reception channel candidates BC are not reception channels Rc as a result of frame synchronization detection. These Nw-1 reception channel candidates BC are called pseudo reception channel Rc 'because lock detection is performed but frame synchronization detection is not performed. That is, Ns pseudo reception channels Rc ′ represented by the following equation (3) exist on both sides of the reception channel Rc.
Ns = ROUND (Nw / 2-0.5) (3)
[0030]
That is, in the occupied band FW, Ns broadcastable channels BC are continuously provided as pseudo reception channels Rc ′ before and after the reception channel Rc. These reception channel Rc and pseudo reception channel Rc ′ existing inside the occupied band are referred to as an occupied band broadcastable channel BCi. Further, a broadcastable channel BC existing outside the occupied band is called a non-occupied band broadcastable channel BCo. In other words, the in-band broadcast-capable channel BCi from the reception channel Rc to the Nsth is the pseudo reception channel Rc ′, and the broadcastable channel BC up to the next in-band-broadcastable channel BCi is the fortune-breaking channel BCi. This is an out-of-band broadcast capable channel BCo.
[0031]
This channel number Ns indicates the number of pseudo reception channels Rc ′ adjacent to one side of the reception channel Rc. That is, the broadcastable channel BC within the Ns channel distance from the reception channel Rc is the in-occupied band broadcastable channel BCi is the pseudo reception channel Rc ′. In this sense, Ns is referred to as a pseudo-reception channel distance in the close occupation band.
[0032]
The frequency distance between the two reception channels Rc as described above is referred to as a reception channel interval FG. Further, Rcc indicates a broadcast channel of a reception channel candidate that can be the reception channel closest to the reception channel Rc displayed on the left side. The frequency distance between the reception channel candidate Rcc and the adjacent reception channel Rc is referred to as the minimum reception channel interval FG (min).
[0033]
The reception channel Rc and the reception channel candidate Rcc also have occupied bands and cannot be overlapped with each other. Therefore, the minimum reception channel interval FG (min) includes Ng broadcastable channels BC (including reception channels Rc) represented by the following equation (4). This Ng is referred to as a minimum reception channel gap.
Ng = ROUND (FG / fΔ−0.5) (4)
[0034]
With reference to FIG. 5, the basic concept of the channel selection method by the digital broadcast receiver for the digital broadcast wave in the L band frequency band shown in FIG. 4 will be described. In the channel selection method, QPSK lock detection is performed for each broadcastable channel BC from the minimum frequency fmin to the maximum frequency fmax of the broadcast frequency band while simply increasing the frequency by fΔ. If QPSK lock is detected, the reception channel is detected by further detecting frame synchronization.
[0035]
That is, in order to check reception, QPSK lock detection is first performed for the number Nmax times of all broadcastable channels BC included in the frequency band of the broadcast wave. Further, the reception channel Rc that can actually receive the digital terrestrial broadcast is detected by performing frame synchronization detection only several times for the in-occupied-band broadcast-capable channel BCi (including the received channel Rc) included in the entire occupied band. To detect.
[0036]
However, such a method is not efficient because lock detection and frame synchronization are performed for all broadcastable channels BC. Therefore, in the present invention, the number of QPSK lock detections for all broadcast channels BC and the number of frame synchronization detections for all broadcast channels BC within the occupied band are reduced as much as possible, and the reception channel Rc is searched at a higher speed. The high-speed search will be described later with reference to FIG.
[0037]
The reception channel Rc means that terrestrial digital broadcasting is actually performed, but the reverse is not necessarily true. This is because the reception state of the terrestrial digital broadcast receiver installed on the mobile body is constantly changing with movement, and from this point, the broadcast is actually executed by detecting the reception channel Rc. There is no problem in detecting the broadcasting station.
[0038]
Next, the configuration of the terrestrial digital broadcast receiving apparatus according to the embodiment of the present invention will be described with reference to FIG. The terrestrial digital broadcast receiver RTD includes a tuner 1, a channel decoder 2, a demultiplexer 3, a decoder 5, a display 7, a program information acquisition controller 9, a storage 11, an input device 13, an OSD processor 15, and a control. A container 20.
The tuner 1 down-converts the frequency of the terrestrial digital broadcast wave Wtd received by a receiving means such as an external antenna VS by frequency conversion, and extracts the terrestrial digital broadcast signal Std of an arbitrary channel (broadcast station).
[0039]
The channel decoder 2 includes a QPSK demodulator 2a, a QPSK lock detector 2b, and a frame synchronizer 2c. The QPSK demodulator 2a is connected to the tuner 1 and QPSK-demodulates the terrestrial digital broadcast signal Std to generate a demodulated reception signal Stdd. The QPSK lock detector 2b detects a QPSK lock based on the demodulated reception signal Stdd and outputs a lock detection signal SL. Based on the lock detection signal SL, the frame synchronizer 2c detects the synchronization of the frame signals arranged in a fixed period in the demodulated reception signal Stdd in which the QPSK lock is detected, and outputs the frame synchronization detection signal SF. The transport stream TS is generated from the demodulated reception signal Stdd.
[0040]
The demultiplexer 3 separates and extracts the MPEG data Dm and the additional information IA from the transport stream TS. The decoder 5 decodes the MPEG data Dm and generates an analog video signal Sva. The input device 13 is composed of a remote controller or the like, and generates an operation signal So for the terrestrial digital broadcast receiving device RTD according to the operation of the viewer.
[0041]
The program information acquisition controller 9 is connected to the channel decoder 2 and receives inputs of the lock detection signal SL and the frame synchronization detection signal SF. The program information acquisition controller 9 receives a program information acquisition request Rpi (not shown) issued at a predetermined time or a reception channel Rc in the broadcastable channel BC of the terrestrial digital broadcast wave Wtd based on the operation signal So. A reception channel for detecting the reception channel Rc is searched, and a reception information signal Stdi indicating information of the detected reception channel Rc is generated.
[0042]
That is, the program information acquisition controller 9 generates a channel signal SN indicating a predetermined broadcast channel N, outputs the approximate channel signal SN to the tuner 1, and controls the decoding of the terrestrial digital broadcast signal Std in the channel N. A decode control signal St is output to the channel decoder 2. In the channel search process, since identification of each channel N is important, a channel identifier (N) is added as a suffix of a code representing each signal as necessary.
[0043]
The tuner 1 sends a terrestrial digital broadcast signal Std (N), which is a component corresponding to the frequency of the broadcast channel N (broadcastable channel BC) indicated by the channel signal SN of the terrestrial digital broadcast wave Wtd, to the channel decoder 2. Output. The channel decoder 2 decodes the terrestrial digital broadcast signal Std (N) in the channel N based on the channel decoding control signal St, and as described above, the lock detection signal SL (N) and the frame synchronization detection signal SF (N). , And a transport stream TS (N).
[0044]
The program information acquisition controller 9 detects the reception channel Rc (N) based on the lock detection signal SL (N) and the frame synchronization detection signal SF (N) from the channel decoder 2. Further, the program information acquisition controller 9 determines the control contents of the tuner 1 and the channel decoder 2 based on these signals, and generates a channel decode control signal St.
[0045]
The program information acquisition controller 9 further controls the acquisition operation of the program information PI (N) based on the additional information IA input from the demultiplexer 3. The acquired program information PI (N) is stored in the storage device 11 as a part of the reception information signal Stdi. The operation of generating the reception information signal Stdi and acquiring the program information PI will be described in detail later with reference to the flowchart shown in FIG.
The program information acquisition controller 9 is connected to the storage device 11 and exchanges the reception information signal Stdi.
[0046]
The program information acquisition controller 9 reads out from the acquired reception information signal Stdi storage 11 and generates an OSD control signal Sosd for displaying an image as an OSD message.
[0047]
Based on the OSD control signal Sosd, the OSD processor 15 generates an OSD video signal Svosd representing the content represented by the reception information signal Stdi as an image, and outputs it to the display unit 7. The display 7 displays an image obtained by multiplexing the OSD video signal Svosd on the analog video signal Sva output from the decoder 5 or an image of one of the signals.
[0048]
The controller 20 controls the overall operation of the terrestrial digital broadcast receiving device RTD by generating a control signal SC and controlling the operations of all the other components constituting the terrestrial digital broadcast receiving device RTD.
[0049]
The program information acquisition operation of the terrestrial digital broadcast receiver RTD will be described below with reference to the flowchart shown in FIG. The terrestrial digital broadcast receiver RTD starts its operation when the power is turned on.
First, in step S2, it is determined whether or not a program information acquisition request Rpi has been issued. The program information acquisition request Rpi may be set in advance to be issued at a predetermined time in the program information acquisition device PIA, or may be input by the user operating the input device 13. As described above. It is determined Yes when the program information acquisition request Rpi is issued. Then, control proceeds to the next step S4.
[0050]
In step S4, the program information acquisition controller 9 starts a channel search process for searching for a broadcast station (reception channel Rc) that can actually be received in the terrestrial digital broadcast wave Wtd. Then, the control proceeds to the next Step S6.
[0051]
In step S6, the program information acquisition controller 9 sets the channel number N indicating the target broadcast channel (broadcastable channel BC) to be detected as to whether or not it is a reception channel (reception channel Rc) in the search target broadcast frequency band. Initialization is performed to indicate a broadcast channel N having a smaller frequency than the receiving channel having the lowest frequency. In this example, after setting to the minimum channel number Nmin (0) indicating the broadcast channel having the minimum frequency among the Nmax broadcast channels included in the search target broadcast frequency band, the control proceeds to the next step S8.
[0052]
In step S8, the program information acquisition controller 9 generates a channel signal SN indicating the number N of channels for determining the reception channel candidate Rcc (N), which is a target for detection of whether or not it is a reception channel. Then, the tuner 1 generates a terrestrial digital broadcast signal Std (N) having a frequency component corresponding to the channel number Nmin (0) based on the channel signal SN and outputs it to the channel decoder 2. Then, the control proceeds to step S10.
[0053]
In step S10, the QPSK demodulator 2a generates a demodulated reception signal Stdd (N) from the terrestrial digital broadcast signal Std (N). The QPSK lock detector 2b performs QPSK lock detection on the demodulated reception signal Stdd (N) to generate the lock detection signal SL (N), and then proceeds to the next step S12.
[0054]
In step S12, based on the lock detection signal SL (N), it is determined whether or not the broadcastable channel BC (N) that is the current detection target is likely to be the reception channel Rc. When the lock detection signal SL (N) is high, it is determined that Yes, that is, the broadcastable channel BC (N) is likely to be the reception channel Rc (N), and the process proceeds to step S14.
[0055]
In step S14, the frame synchronizer 2c performs frame synchronization detection processing on the demodulated reception signal Stdd (N) at the time when the QPSK lock is detected, and generates the frame synchronization detection signal SF (N). The Then, the control proceeds to the next Step S16.
[0056]
In step S16, based on the frame synchronization detection signal SF (N), it is determined whether or not the broadcastable channel BC (N) that is the current detection target is the reception channel Rc. When Yes, that is, when the frame synchronization detection signal SF (N) is high, the content information (transport stream TS) can be demodulated, so that the current broadcastable channel BC (N) is the reception channel Rc (N). To be judged. Then, the control proceeds to the next Step S18.
[0057]
In step S18, the program information acquisition controller 9 stores the reception information signal Stdi (N) indicating the reception information RI (N) indicating information such as the channel number N determined as the reception channel Rc (N) and its frequency. 11 is output. The storage device 11 stores the received information RI (N) based on the received information signal Stdi (N). Then, the control proceeds to the next Step S20.
[0058]
In step S20, the channel N (broadcastable channel BC (N)) determined as the reception channel Rc (N) in step S18 described above is a new channel that has not been detected as the reception channel Rc (N). It is determined whether or not a terrestrial digital broadcasting station is indicated. Specifically, if the received information RI (N) output in step S18 is not already stored in the storage device 11, it is determined that the station is a new broadcasting station. Then, the control proceeds to step S22.
[0059]
In step S <b> 22, the reception information RI (N) is stored in the storage device 11, and information related to the new broadcast station (reception channel Rc (N)) is added to the storage device 11. Then, the control proceeds to the next Step S24.
[0060]
On the other hand, if No in step S20 described above, that is, if the reception information RI (N) indicates a broadcast station that has been detected conventionally, the control skips step S22 and proceeds to step S24.
[0061]
In step S24, the program information acquisition controller 9 acquires program information PI (N) from the additional information IA. The program information PI (N) is stored in a program information table PIT (N) stored in the storage device 11. Then, the control proceeds to the next Step S26.
[0062]
In step S26, the program information acquisition controller 9 increments the channel number N by the minimum reception channel gap Ng corresponding to the minimum reception channel interval FG (min). Then, the control proceeds to the next Step S32.
[0063]
On the other hand, if No in step S16, that is, the frame synchronization detection signal SF is low, that is, it is determined that the currently detectable broadcastable channel BC (N) is not the reception channel Rc, but within the occupied band broadcastable channel BCi, the control is step S28. Proceed to
[0064]
In step S28, the program information acquisition controller 9 increments the channel number N by 1, which is the adjacent channel distance, and returns to step S8. This is because, as described with reference to FIG. 4, the adjacent channel of the intra-occupied band broadcastable channel BCi may be the reception channel Rc. This is the reason why the increment amount of the channel number in step S30, which will be described later, is different from the case in which the in-proximity band broadcast channel distance Ns.
[0065]
On the other hand, if No in step S12, that is, if the lock detection signal SL (N) is low, it is determined that there is no possibility of the broadcast channel BC (N) being the reception channel Rc (N). Then, the control skips steps S14 to S24 described above and proceeds to step S30.
[0066]
In step S30, the program information acquisition controller 9 increments the channel number N by the in-proximity band broadcast channel distance Ns, and proceeds to step S32. As described with reference to FIG. 4, all broadcastable channels BC within the near-occupied band broadcast channel distance Ns from the reception channel Rc are all in-occupied band broadcastable channels BCi. Therefore, as long as the reception channel Rc has already been detected, it is not necessary to detect whether or not it is the reception channel Rc with respect to these Ns in-band occupied channel BCi. Therefore, by removing these in-occupied band broadcastable channels BCi from the detection target and setting the out-of-occupied band broadcastable channel BCo closest to the detected reception channel Rc as the next detection target, the search efficiency can be improved. It is intended to improve.
[0067]
In step S32, the program information acquisition controller 9 still has a broadcastable channel BC to be detected whether it is a reception channel Rc or not in the target broadcast frequency band based on whether or not N is larger than the maximum number of channels Nmax. Judge whether or not. If N> Nmax is not satisfied, that is, it is determined that there is a broadcastable channel BC that should be detected whether it is the reception channel Rc in the target broadcast frequency band, and the control returns to step S8 described above. Then, the above-described steps S10 to S32 are repeated for the broadcastable channel BC (N = N + Ns, N = N + Ng, N = N + 1).
[0068]
If Yes in step S32, that is, if N> Nmax, it is determined that there is no more broadcastable channel BC to be detected whether it is the reception channel Rc within the target broadcast frequency band, and the control is terminated. That is, the reception information RI (N) of all the detected reception channels Rc (N) is stored in the storage 11, and the reception information RI of the terrestrial digital broadcast that can be received by the terrestrial digital broadcast reception device RTD is stored. Completed.
[0069]
The received information RI and program information PI will be described with reference to FIG. As illustrated in the figure, the program information PI includes Nmax pieces of program information PI (N). The reception information RI includes a broadcastable channel BC (N), a broadcast station BCid (N), a new FB (N), and program information PI (N). The broadcast station BCid (N) is ID information that identifies a reception channel Rc (N) that is a broadcast station that is broadcasting on the broadcastable channel BC (N). In the drawing, N = 2 NHK and N = 30 XYZ correspond.
[0070]
The new FB (N) represents whether or not the reception channel Rc (N) is newly detected by binary values of H (high) and L (low). This figure shows that N = 30 XYZ broadcast stations (reception channel Rc (30)) are newly detected broadcast stations.
[0071]
The program information PI (N) is program information provided by the reception channel Rc (N). In the figure, program information PI (30) of the XYZ broadcast station of the reception channel Rc (30) is illustrated.
[0072]
More specifically, in the above-described step S18, the broadcastable channel BC (N) and the broadcast station BCid (N) in the received information RI are detected, the new FB (N) is detected in step S22, and the step In S24, the program information PI (N) is detected and stored in the memory 11 as a part of the reception information RI (N) at each step. That is, the reception information RI (N) is completed in step S24. The reception information RI (N) may be stored in a lump in step S24. Then, it is determined No in step S <b> 32, the next reception information RI (N + Ns, N + Ng, N + 1) is detected and stored in the storage device 11. When it is determined Yes in step S32, the reception information RI is completed.
[0073]
As described above, the terrestrial digital broadcast receiving device RTD according to the present invention can receive signals in the entire frequency band of terrestrial digital broadcast at any time regardless of whether or not the user particularly desires to view or not. Receive terrestrial digital broadcast signals from channels (broadcast stations). Then, all program information provided from channels that can be received in terrestrial digital broadcasting is automatically acquired to facilitate the user's channel selection operation.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a terrestrial digital broadcast receiving apparatus according to an embodiment of the present invention.
FIG. 2 is a flowchart showing a program information acquisition operation of the terrestrial digital broadcast receiving apparatus shown in FIG.
3 is an explanatory diagram showing a display example of program information acquired in the terrestrial digital broadcast receiver shown in FIG. 1; FIG.
4 is an explanatory diagram of a broadcast channel reception confirmation method in the terrestrial digital broadcast receiver shown in FIG. 1. FIG.
FIG. 5 is an explanatory diagram of a channel selection search method in the terrestrial digital broadcast receiver shown in FIG. 1;
[Explanation of symbols]
RTD terrestrial digital broadcast receiver
VS antenna
1 Tuner
2-channel decoder
2a QPSK demodulator
2b QPSK lock detector
2c frame synchronizer
3 Demultiplexer
5 Decoder
7 Display
9 Program information acquisition controller
11 Memory
13 Input device
15 OSD processor
20 Controller

Claims (3)

A terrestrial digital broadcast receiver that receives terrestrial digital broadcast waves in which a plurality of broadcast- capable channels are set at predetermined frequency intervals,
A reception channel detection means for detecting a reception channel from the plurality of broadcast possible channels,
Reception information acquisition means for acquiring reception information of the reception channel detected by the reception channel detection means;
With
The reception channel detection means includes
Lock detection means for performing demodulation lock detection in order from the broadcastable channel set to the minimum frequency among the plurality of broadcastable channels;
Frame synchronization detection means for performing frame synchronization detection on a broadcastable channel in which demodulation lock is detected by the lock detection means;
With
When the demodulation lock is not detected by the lock detection means,
Controlling the lock detection means to perform demodulation lock detection on a broadcastable channel that is separated by a broadcast channel distance in the close-occupied band in the direction of increasing frequency,
When frame synchronization is not detected by the frame synchronization detection means,
The lock detection means is controlled so that demodulation lock detection is performed for broadcastable channels separated by one broadcastable channel in the direction of increasing frequency.
A terrestrial digital broadcast receiver characterized by the above . When frame synchronization is detected by the frame synchronization detection means,
The lock detection means is controlled so that demodulation lock detection is performed on a broadcastable channel separated by the lowest reception channel gap in the direction of increasing frequency.
The terrestrial digital broadcast receiving apparatus according to claim 1. The received information is
A channel number of the reception channel, a broadcast station ID indicating a broadcast station, detected information indicating whether or not the reception channel is newly detected, program information,
The terrestrial digital broadcast receiver according to claim 1, comprising:

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