JPH0744430B2 - Radio receiver - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio receiver having a PLL (Phase Locked Loop) and changing a frequency division ratio set in a frequency divider of the PLL to select a channel. Is.

Conventional technology Conventionally, the frequency division ratio set in the PLL is sequentially changed to change the reception frequency, the frequency division ratio corresponding to the receivable broadcasting station is stored in the memory, and it is stored by operating the preset memory button. There is known a radio receiver that instantly selects a desired broadcasting station by calling a frequency division ratio.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described auto preset function of the conventional radio receiver, when the auto preset function is operated, the division ratio data stored until then is erased, and new data is stored. It was rewritten to. For example, in an on-vehicle radio receiver, even if the frequency division ratio data of the broadcasting station that can be received in the area (local area) where the vehicle normally travels is stored in the memory, if the auto preset function is operated in the distance, The above-mentioned frequency division ratio data of the local broadcasting station that was stored in was erased and rewritten with new frequency division ratio data, and when returning to the local area, it was necessary to operate the auto preset function again. .

The present invention solves the above-mentioned conventional problems, and provides a radio receiver in which the data stored in the memory before that is not erased even if a new broadcasting station is preset. is there.

Means for Solving the Problems In order to achieve the above object, the present invention provides first and second memories for storing frequency division ratio data corresponding to a broadcasting station, and the first and second memories. It is characterized by comprising a memory selecting means for selecting one.

As described above, according to the present invention, since the first and second memories are provided and these memories can be selected and used, for example, in the case of an in-vehicle radio receiver, the first memory may include a portion of a local broadcasting station. The frequency ratio data can be stored, and the frequency ratio data of broadcast stations other than the local station can be stored in the second memory. Therefore, it is not necessary to perform the preset operation of the broadcasting station again when returning to the local area.

Embodiment FIG. 2 shows a front view of a vehicle-mounted acoustic device (integrated device of a radio receiver and a cassette deck) incorporating a radio receiver according to an embodiment of the present invention. In FIG. 2, 1 is the main body of the apparatus, 2 is a power switch, 3 is a dust cover which is openably and closably provided in the set insertion opening, 4 is an eject button for ejecting the inserted cassette, and 5a, 5b and 5c are Each is a key switch, for example key switch 5b
Is for switching between displaying the time and the receiving frequency on the display section described later.
Reference numeral 5c is for displaying the equalizer characteristic on the characteristic display section described later and for switching to the equalizer characteristic adjusting mode. Reference numeral 6 denotes a function display portion 6 for displaying operable functions. On the front surface of the function display portion 6, a plurality of key switches 7a to 7m made of transparent electrodes are arranged as shown in FIG. There is. 2 shows a display example in the radio mode, and FIG. 3 shows a display example in the cassette deck mode. Reference numeral 8 is a display section for displaying the reception frequency, time, traveling direction of the cassette deck, AM, FM, preset channel number display, etc., and 9 is a characteristic display section for displaying the spectrum characteristic and the equalizer characteristic. A key switch 7m is arranged in the characteristic display section 9 as shown in FIG. 4, and by operating this key switch 7m, the display of the characteristic display section 9 is switched alternately between the spectral characteristic display and the equalizer characteristic display. To be 10 is a volume adjustment function display section that displays the volume adjustment function. “VOL” blinks in the volume adjustment mode, “BAL” blinks in the left / right volume balance adjustment mode, and “FAD” blinks in the front / rear volume adjustment mode. To do. As shown in FIG. 4, a key switch 7o for mode switching is arranged on the volume adjusting function display portion 10. By operating the key switch 7o, the above-mentioned volume adjusting mode and left / right volume balance adjusting mode are set. The front and rear volume adjustment modes are sequentially switched. Reference numeral 11 denotes a level attenuation display section. A key switch 7p is arranged on the level attenuation display section 11 as shown in FIG. 4, and the reproduction signal can be attenuated by 20 dB by operating the key switch 7p. . Note that when attenuating by 20 dB, it is displayed as "-20 dB". Reference numeral 12 denotes an up / down display portion for displaying an increase or decrease in volume, and the up / down display portion 12 is provided with key switches 7q and 7r as shown in FIG. The key switch 7q is for increasing the volume, and the key switch 7r is for decreasing the volume.

FIG. 1 shows the configuration of the above embodiment. In FIG. 1, 20 is an electronic tuner, 21 is a cassette deck, and 22 is an analog switch. The analog switch 22 is an audio signal output from the electronic tuner 20 and the cassette deck 21.
To select one of the acoustic signals output from
The control signal output from the cassette deck 21 when the cassette is inserted into the cassette deck 21 causes the analog switch 22 to be switched to the cassette deck 21 side, and the control signal generated when the cassette is ejected from the cassette deck 21. Thereby, the analog switch 22 is switched to the electronic tuner 20 side. 23 is a bandpass filter group, and this bandpass filter group 23 has a center frequency of 63 Hz, 125 Hz, 2
50Hz, 500Hz, 1KHz, 3.5KHz, 10KHz bandpass filter f ₁
It consists of ~ f ₇ . The output of the bandpass filter f ₁ ~f ₇ is used for spectral characterization. 24R24L
Is a group of bandpass filters that respectively configure equalizers for the right channel and the left channel, and these bandpass filter groups 24R24L are each composed of a plurality of bandpass filters f _{1 to} f ₇ having different center frequencies. twenty five
R25L is an electronic volume group that constitutes an equalizer for the left channel, and these electronic volume groups 25R2
5L is composed of a plurality of electronic volumes VR1 to VR7 for adjusting the output level of the bandpass group 24R24L. 26R26L is an analog switch that constitutes a defeat switch for the right channel and the left channel, respectively. By switching the analog switch 26R26L, it is possible to output an acoustic signal without going through the equalizer. 27F is right,
Electronic volume for adjusting the level of front (Front) signals FR and FL of the left channel, 27R is right, rear R of left channel
This is an electronic volume for adjusting the levels of the ear signals RR and RL. 28F is a power amplifier that amplifies the front signals FR and FL, 28
R is a power amplifier that amplifies the rear signals RR and RL. The front signals FR and FL amplified by the power amplifier 28F are speakers 29FR and 29FL arranged on the right side and the left side, respectively, on the front side in the passenger compartment of the automobile.
Signal R after being applied to the power amplifier 28A and amplified by the power amplifier 28R.
R and RL are applied to speakers 29RR and 29RL, which are arranged on the right and left on the rear side of the passenger compartment, respectively. Reference numeral 30 denotes an operating portion, which is the key switch 5a-5c, 7a-7r in FIG.
Composed of. 31 is a display unit, and this display unit 31 is
The function display section 6, the display section 8, the characteristic display section 9, the volume adjustment function display section 10, the level attenuation display section 11, and the up / down display section 12 in FIG. A driver 32 drives the display unit 31.

33 is a central processing unit CPU that controls the electronic tuner 20, cassette deck 21, electronic volumes 25R, 25L, analog switches 26R, 26L, electronic volumes 27F, 27R, and driver 32.
The functions of the CPU 33 will be described below. 34
Is a key processing means, and this key processing means 34 is an operation unit 30.
The key switch operated by is discriminated to change or update the data stored in the storage means 35, and the key discrimination result is sent to the timing control means 36. The timing control means 36 determines the timing of various operations according to the key discrimination result, the storage control means 37, the device selection control means 38,
The display control means 39 and the deck control means 40 are controlled. The storage control means 37 designates an address for writing data to or reading data from the storage means 35. The storage means
35 includes data for controlling the electronic tuner 20, data for controlling the cassette deck 21, and for equalizer control (electronic volume 25R, 25L, analog switch 26R, 26L
(For control), data for controlling the electronic volume 27F, 27R, and data for controlling the driver 32 are stored, and the data read from this storage means 35 is stored in the display control means, the deck control means 40, and the serial interface 41. Transferred. The device selection control means 38 is a device to which data is to be transferred from the CPU 33 (electronic tuner 20, equalizer electronic volume 25R, 25L, analog switch 26R, 26L,
Specify the electronic volume 27F, 27R, driver 32).
The data read from the storage means 35 is transferred to the electronic tuner 20, the equalizer (electronic volume 25R, 25L), the electronic volume 27F, 27R, and the driver 32 via the serial interface 41 and the interface 42. Also, the data for controlling the cassette deck is the deck control means 40
Is transferred to the cassette deck 21 via. 43 is a timer for time management of the timing control means 36, and 44 is A / D conversion of the output of the bandpass filter group 23. This is A / D conversion means, and the data converted by this A / D conversion means 44 is transferred to the driver 32 via the display control means 39, the serial interface 41, and the interface 42.

FIG. 6 shows the electronic tuner 20 in FIG.
In FIG. 6, 45 is an antenna, 46 is a high frequency amplifier circuit,
47 is a mixer circuit, 48 is an intermediate frequency amplifier circuit, 49 is a detection circuit, 50 is a multiplexer that separates the output of the detection circuit 49 into left and right signals, 51 is a voltage controlled oscillator that constitutes a PLL, 52
Is a prescaler for dividing the local oscillation frequency output from the voltage controlled oscillator 51, 53 is a demultiplexing means, and the dividing ratio of the dividing means 53 is set by the dividing ratio setting means 54. 55
Is a phase comparing means for comparing the phase of the output of the frequency dividing means 53 and the output of the reference oscillating means 56, and the signal corresponding to the phase difference output from the phase comparing means 55 is converted into direct current through the low pass filter 57. It is converted and input to the voltage controlled oscillator 51. From the voltage controlled oscillator 51, a signal having a local oscillation frequency corresponding to the frequency division ratio set in the frequency divider 53 is output and supplied to the mixer circuit 47. Reference numeral 58 is an electric field strength SD comparison means, and this SD comparison means 58 compares whether or not the signal corresponding to the electric field strength level output from the intermediate frequency amplification circuit 48 is at a predetermined level or higher. 59 is an intermediate frequency f _if within a predetermined range (10.686f _if 10.714MHz for FM, 45 for AM)
0 ± 2 KHz], the IF counter means 59 determines that the intermediate frequency f _if is within a predetermined range, and the SD comparison means determines that the electric field strength level is equal to or higher than a predetermined level. When it is determined that the electric field strength level is present, the electric field strength level is stored in the storage unit 61 via the calculation unit 60 together with the frequency division ratio output from the frequency division comparison setting unit 54. 62
Is timing control means, and this timing control means
62 is SD comparison means 58, IF counter means 59, frequency division ratio setting means
Controls the operation timing of 54.

Next, an outline of the operation of the above embodiment will be described.

Turn on the power switch 2 with no cassette inserted
Then, the radio mode is set, and when the portion displayed on the function display portion 6 in FIG. 2, for example, the “FM” display portion is pressed, the corresponding key switch (key switch of FIG. 4 is pressed.
7a) is turned on, the FM broadcast is received, "FM" is displayed on the display unit 8, and the reception frequency is displayed. The characteristic display unit 9 also displays the level of each frequency band of the acoustic signal. (Spectral characteristic display) Also, if the "TUNE" portion of the display is operated and the key switch 7d or 7f is pressed, tuning is performed. In addition, when the key switch 7d or 7f is pressed for a short time, the channel is manually selected, and when it is pressed for a long time, the channel is automatically selected. Also, the display "1", "2", "3",
Key switches 7h to 7m corresponding to "4", "5", and "6"
Press one of the to receive preset stations. In FIG. 2, when the volume adjusting function display section 10 is pressed once, the volume adjusting mode is activated and "VOL" blinks. When the key switch 7q or 7r of the up / down display unit 12 is pressed in this state, new data is set in the electronic volume 27F, 27R and the volume is increased or decreased.

When the key switch 5c is pressed in the state shown in FIG. 2,
The equalizer mode is set and the display is switched to that shown in FIG.
In FIG. 5, for example, when the portion corresponding to the display "63" is pressed, the key switch 7a is turned on and the column corresponding to 63 Hz on the characteristic display portion 9 blinks. When the key switch 7q or 7r of the up / down display section 12 is pressed here, the level of 63 Hz of the equalizer is changed and the display of the characteristic display section 9 is also switched. Similarly, the levels of other frequency bands can be adjusted. After the adjustment, for example, when the display "1" portion is pressed for a long time (for example, 2 seconds or more), the adjusted equalizer characteristic is stored in the storage unit 35. When the display "1" portion is pressed for a short time, the stored equalizer characteristic data is read out, this data is set in the electronic volume controls 25R, 25L, and the characteristic display section 9
The display is switched to the display corresponding to the set equalizer characteristic.

In the radio mode, when a cassette is inserted, the cassette deck mode is set and the display is switched to that shown in FIG. When the key switches 7a to 7m corresponding to the respective functions displayed on the function display section 6 are operated, the deck control corresponding to the display is performed.

Further, in the radio mode or the cassette deck mode, when the key switch 7m arranged in the characteristic display section 9 is operated, the spectrum characteristic display and the equalizer characteristic display are switched alternately.

Next, the auto preset function of the radio receiver, which is a characteristic of the present invention, will be described.

In the radio mode shown in Fig. 2, when the "PSET" portion of the auto preset display is pressed for a predetermined time (for example, 2 seconds),
A timing signal for auto-preset is output from the timing control means 36, and this timing signal is transferred to the electronic tuner 20 via the serial interface 41 and the interface 42, and the electronic tuner 20 starts the auto-preset operation and is displayed on the display unit 8. For example, "FM2" is displayed. The electronic tuner 20 first reads the frequency division ratio data stored in the storage means 61 and sets the frequency division ratio data in the frequency division means 53. Therefore, a local oscillation frequency signal corresponding to the set frequency division ratio is output from the voltage controlled oscillator 51 to the mixer.
It is supplied to 47, and it becomes possible to receive the broadcast of the predetermined reception frequency. Here, the IF counter means 59 determines whether or not the intermediate frequency f _if is within a predetermined range, and the SD comparison means 58 determines whether or not the electric field enhancement is equal to or greater than a predetermined value. When the intermediate frequency f _if is within the predetermined range and the electric field strength is equal to or more than the predetermined value, the frequency division ratio and the electric field strength are stored in the storage means 61. When the intermediate frequency f _if is not within the predetermined range or the electric field strength is smaller than the predetermined value, the division ratio and the electric field strength are not stored. Next, the frequency division ratio is changed and the above processing is repeated. By the above processing, the storage means 61 stores the seventh
As shown in the figure, frequency division ratio data A to F and electric field intensity data a to f for six stations are stored. The calculation means 60
Performs processing to store in the memory of band 2 of the storage means 61 in descending order of electric field strength. As a result, in the memory of band 2 shown in FIG. 7, the station having the highest electric field strength (field strength a) to the sixth station (field strength f) is stored in order. As described above, the frequency division ratio is sequentially changed, the reception frequency is searched from the lower frequency side to the higher frequency side, and when the data (frequency division ratio, electric field strength) for 6 stations with strong electric field strength is stored, preset Switch to scan mode. In the preset scan mode, the frequency division ratio data stored in the memory of band 2 of the storage means 61 is read in order of increasing electric field strength at predetermined time intervals, and the receiving station is changed at predetermined time intervals. In this preset scan mode, when the desired station is received, if the display "PSET" portion of the function display portion 6 is operated for a short time, the preset scan mode ends and the storage means
The reading of the frequency division ratio data from 61 is stopped, and the frequency division means 53
The frequency division ratio data corresponding to the desired station remains set.

FIG. 8 shows a flow in the auto preset mode. In auto preset mode, step 1
At present, it is judged whether or not it is currently in band 1 (whether in manual preset mode or not). If it is judged as band 1, it is switched to band 2 (auto preset mode) in step 2 and the process proceeds to step 3. If it is determined in step 1 that the band is not band 1, the process proceeds to step 3 and the search is started from the lowest frequency in the band. In step 4, storage means
The frequency division ratio data read from 61 is set in the frequency division means 53,
In step 5, it is determined whether or not the division ratio corresponding to the highest reception frequency is set. If "NO", step 6
At step 7, it is determined whether the electric field strength SD is equal to or greater than a predetermined value, and then at step 7, it is determined whether the intermediate frequency is within a predetermined range. If “YES” is determined in step 7, the frequency division ratio and the electric field strength at that time are stored in the memory of band 2 of the storage means 61 in the order of strong electric field strength in step 8. When it is determined to be "MO" in steps 6 and 7, the process returns to step 4. As described above, the frequency division ratio is sequentially changed, and steps 4 to 8 are repeated,
As described above, the data for six stations are stored in the storage means 61 in the order of increasing electric field strength. When it is determined in step 5 that the frequency division ratio corresponding to the highest reception frequency is set, the preset scan operation is performed in step 9 as described above.

Next, manual presetting will be described. In FIG. 2, when the manual tuning display section "TUNE" is pressed, the key switch 7d or 7f is turned on to enter the manual tuning mode, and the display section 8 displays, for example, "FM1".
Each time the key switch 7d or 7f is operated, the frequency division ratio data is sequentially read from the storage means 61, and the reception frequency is sequentially changed. When the station you want to memorize is received, press the display "1" part of the display unit 6 for a predetermined time or longer and the key switch 7h turns on.
Then, the frequency division ratio (for example, frequency division ratio G) corresponding to the station to be stored is stored in the memory of band 1 in FIG. Similarly, the frequency division ratios HL of the other five stations can be stored in the memory of band 1. After the manual preset is completed as described above, if one of the displays "1" to "6" (for example, "3") on the function display portion 6 in FIG. 2 is operated for a short time, the band 1 in FIG. The corresponding frequency division ratio I is read out from the memory of No. 2, set in the frequency divider 53, the desired station is received, and the display "FM" on the function display unit 6 in FIG.
Alternatively, when "AM" is operated, the band 1 and the band 2 of the storage means 61 are switched.

Although FIG. 7 shows the FM band 1 and band 2 memories, the memory means 61 is similarly provided with AM band 1 and band 2 memories.

Further, in the above embodiment, as shown in FIG.
Is used as the memory for manual printing, and band 2 is used as the memory for auto presetting, but bands 1 and 2 may be used as the memory for manual presetting, or bands 1 and 2 may be used as the memory for auto presetting.

EFFECTS OF THE INVENTION The present invention has the above-described configuration and has the first and second memories, and one of these memories can be selected and used. The data of the broadcasting station can be stored in the first memory, and the data of the broadcasting station other than the local can be stored in the second memory, and it is not necessary to perform the preset operation again when returning to the local.

[Brief description of drawings]

FIG. 1 is a block diagram of an audio device equipped with a radio receiver according to an embodiment of the present invention, FIGS. 2 and 3 are front views of the same device, and FIG. 4 is a layout of key switches of the same device. FIG. 5, FIG. 5 is a front view of the same device, FIG. 6 is a block diagram of the radio receiver, FIG. 7 is a diagram for explaining contents stored in the storage means of the radio receiver, and FIG. It is a figure explaining the auto preset operation of a receiver. 1 ... Device body, 2 ... Power switch, 3 ... Dust cover, 4 ... Eject button, 5a-5c ... Key switch,
6 ... Function display section, 7a to 7r ... Key switch, 8 ... Display section, 9 ... Characteristic display section, 10 ... Volume adjustment function display section,
11 …… Level attenuation display section, 12 …… Up-down display section,
20 …… Electronic tuner, 21 …… Cassette deck, 22 …… Analog switch, 23 …… Bandpass filter group, 24L, 24
R …… Band pass filter group, 25L, 25R …… Electronic volume group, 26L, 26R …… Analog switch, 27F, 27R …… Electronic volume, 28F, 28R …… Power amplifier, 29FR, 29FL, 29R
R, 29RL …… Speaker, 30 …… Operating section, 31 …… Display section, 32
...... Driver, 33 ...... Central processing unit, 34 ...... Key processing means, 35 ...... Memory means, 36 ...... Timing control means, 37
...... Memory control means, 38 ...... Device selection control means, 39 ...
Display control means, 40 deck control means, 41 serial interface, 42 interface, 43
Timer, 44 …… A / D conversion means, 45 …… Antenna, 46 ……
High-frequency amplifier circuit, 47 ... Mixer circuit, 48 ... Intermediate frequency amplifier circuit, 49 ... Detection circuit, 50 ... Multiplexer, 51
...... Voltage controlled oscillator, 52 …… Prescaler, 53 …… Division means, 54 …… Division ratio setting means, 55 …… Phase comparison means, 56
...... Reference oscillating means, 57 ...... Low-pass filter, 58 …… Field strength comparing means, 59 …… IF counter means, 60 …… Computing means, 61 …… Storage means, 62 …… Timing control means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichiro Furuya 4-3-1, Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa Matsushita Communication Industrial Co., Ltd. (72) Masami Shibao Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa 3-3-1 Matsushita Communication Industrial Co., Ltd. (72) Inventor, Kazuyoshi Matsui 4-3-1 Tsunashima East, Kohoku Ward, Yokohama City, Kanagawa Prefecture Matsushita Communication Industrial Co., Ltd. (56) Reference JP-A-63-204811 ( JP, A) JP 62-196915 (JP, A) JP 61-19220 (JP, A) JP 61-59907 (JP, A) Actual development Sho 58-186631 (JP, U)

Claims (1)

[Claims] 1. An electronic tuner for changing a reception frequency by changing frequency division ratio data set in a frequency divider constituting a PLL (Phase Rod Loop), and an automatic tuner in the order of strongest electric field strength in an auto preset mode. A first memory for storing the frequency division ratio data and the electric field strength data of the station, and a control for reading the frequency division ratio data stored in the first memory in order of increasing electric field strength and changing the receiving station every predetermined time. Means and a second memory for storing the frequency division ratio data of a desired station in the manual preset mode,
A radio receiver comprising a memory selection means for selecting the first or second memory.