JP2907293B2 - Receiver - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving apparatus suitably implemented in a radio receiver, a television receiver, and the like. More specifically, for example, a carrier frequency signal includes an audio signal of a radio broadcast. In addition, the present invention relates to a receiving apparatus suitably implemented in a so-called radio data system (RDS) or the like in which a program signal and a code signal representing network information and the like are simultaneously transmitted.

Prior Art A typical prior art is a phase locked loop (PL).
L) A receiving device such as a radio receiver equipped with a frequency synthesizer. In this prior art, a high frequency signal of a broadcasting station having a predetermined electric field strength or more is received by so-called auto tuning. The operator can select a desired broadcast station by selecting from the received signals, and the tuning operation is easy.

In such prior art, it is not possible to selectively listen to desired program contents, for example, a news program, a sports program, and the like. Also, as the number of broadcasting stations increases, a large number of signals are received, and it becomes difficult to easily select a desired program.

Particularly, in a radio receiver mounted on an automobile, the frequency at which the same program can be received changes because the broadcast station changes as the user moves from one area to another, and the receiver must be retuned each time. From the viewpoint of facilitating the tuning operation and improving the safety, it is convenient if it is possible to select not only an automatic frequency selection function such as so-called auto tuning but also a program content.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to provide a receiving apparatus capable of selecting and receiving a desired program accurately and quickly with a simple operation while improving operability.

Means for Solving the Problems According to the present invention, a plurality of broadcasting stations broadcasting the same program constitute one network, and such a network is
Each broadcast station transmits code signal data together with its own program, and the code signal data is used to identify programs related to the same network as its own and other networks different from its own. A receiving device for receiving the program and the code signal data, including identification information, and frequency information indicating a frequency of a broadcast station constituting each network corresponding to the identification information; (B) frequency information detecting means for detecting frequency information included in each received code signal data; (c) frequency information detecting means for detecting frequency information included in each received code signal data; (D) a plurality of preset buttons, and (e) corresponding to each of the preset buttons. A memory provided for each piece of identification information to be stored; and (f) responding to each output of the identification information detection means, frequency information detection means, and reception sensitivity detection means, When the received code signal data includes identification information and frequency information of another network different from the received broadcast network, the identification information and frequency information are stored in each storage area of the memory in units of identification information. And performs a reception operation based on the stored frequency information, stores the reception sensitivity detected in the reception operation in the memory in association with each frequency information, and responds to the output of the preset button. When the preset button is operated, the highest frequency of the reception sensitivity stored in the storage area of the memory corresponding to the preset button. Control means for selecting information and tuning to the selected frequency.

Operation According to the present invention, a plurality of networks are constituted by a plurality of broadcast stations broadcasting the same program. Therefore, the network is a general concept including all the broadcast stations broadcasting the same program. The code signal data transmitted by each broadcasting station includes not only identification information for identifying a program on the same network as the own station, but also identification information for identifying a program on another network, and further corresponds to the identification information. And frequency information indicating the frequency of a broadcast station constituting each network. In memory,
Storage area corresponding to each of multiple preset buttons
ME1 to MEn are provided, and the storage areas ME1 to MEn are provided for each piece of identification information PI to be stored. Each storage area corresponds to one identification information PI, frequency information AF of one or a plurality of broadcast stations constituting each network corresponding to the identification information PI, and reception sensitivity for each frequency information. Then, the information is stored in the unit of identification information.

Therefore, when the preset button is operated, the frequency information having the highest reception sensitivity is selected from among the frequency information of a plurality of broadcast stations constituting one network stored in the storage area corresponding to the preset button, and the frequency information is selected. The receiver tunes to the selected frequency.

Embodiment FIG. 1 is a block diagram of a radio receiver 20 according to one embodiment of the present invention. Carrier waves from a plurality of broadcasting stations are received by the antenna 15, received in a superheterodyne system, and sounded by the speaker 7.

A carrier wave from a radio broadcast station is received by an antenna 15 and a high frequency amplification / mixing circuit 1 for performing high frequency amplification and mixing
Given to. The high-frequency amplification / mixing circuit 1 includes a phase locked loop frequency synthesizer, and a reception frequency and a local oscillation frequency are set by a control signal from a control circuit 9 via a signal line 19.

The output from the high frequency amplification / mixing circuit 1 is supplied to an intermediate frequency amplification detection circuit 2 which performs intermediate frequency amplification and performs detection such as frequency discrimination. Intermediate frequency amplification detection circuit 2
Is supplied to a separation circuit 3 and separated into left and right audio signals of stereo broadcast. The sound signal from the separation circuit 3 is supplied to an adjustment circuit 5 that performs sound quality adjustment and volume adjustment through a mute circuit 4.

The mute circuit 4 suspends the derivation of the audio signal by the mute signal provided from the control circuit 9 via the signal line 18. The sound signal from the adjustment circuit 5 is power-amplified by the power amplification circuit 6 and is sounded by the speaker 7.

The output from the intermediate frequency amplification detection circuit 2 is also supplied to the control circuit 9 via the demodulation circuit 8, and the operation state of the control circuit 9 is displayed on the display unit 10. The display unit 10 is configured by, for example, a liquid crystal display device. Key input section 12
Has select button 13 and preset buttons P1 to Pn
Are included, select button 13 and preset button P1
By operating ~ Pn, the radio receiver 20 performs an operation as described later.

FIG. 2 shows a frequency modulated wave (F
FIG. 3 is a diagram illustrating a frequency spectrum of an M-modulated wave). The FM modulated wave includes an L + R signal 41 which is a sum of the left audio signal (L) and the right audio signal (R) at a frequency of 15 kHz or less in order to realize stereo broadcasting. The pilot signal 42 having a frequency of 19 kHz indicates the presence or absence of stereo broadcast. When the pilot signal 42 is being transmitted, the separation circuit 3 separates the left and right audio signals of the stereo broadcast.

Signals 43a and 43b, which are difference signals between left and right voices (collectively referred to as LR signals 43), are suppressed by a suppressed carrier wave 44 which is a harmonic signal having a frequency of 38 kHz twice the pilot signal 42.
Are included as sideband signals in the range of 23 kHz to 53 kHz.

The above-mentioned RDS signal amplitude-modulates a 57 kHz subcarrier 45 which is three times the frequency of the pilot signal 42. Therefore, the RDS signal is distributed as sideband signals 46a and 46b on both sides of the subcarrier 45. The demodulation circuit 8 demodulates the sideband signals 46a and 46b in a configuration described later to derive an RDS digital signal shown in FIG.

As shown in FIG. 3 (1), this RDS digital signal is constituted by, for example, a bit sequence of 104 bits as one group, and one group is constituted by four blocks of 26 bits. One block is composed of, for example, a 16-bit information word and a 10-bit check word, and the check word is placed to detect / correct an error in the information word.

The information of the first block of one group is PI (Program Iden)
This code is called an identification code of a broadcast program including the RDS digital signal. In the first 4-bit area 51 of the second block, a code indicating the type of this group is placed. From the data in the area 51, the types of information of the third block and the fourth block can be known. For example, the PI code of a program on a network other than the broadcasting station transmitting the RDS data signal, or an AF (Alte) indicating the carrier frequency of the broadcasting station on the network.
rnative Frequencies) code etc. are placed. Such codes representing information on programs on other networks are collectively referred to as EON (Enhanced Other Network) codes.

In the second block, for example, PT indicating the type of program
A Y (Program Type) code is placed in an area 53, and a TP (Traffic Progra) indicating whether the currently receiving broadcasting station and other networks are broadcasting stations for broadcasting traffic information.
m Identification) code is placed in areas 52,54.

In such RDS data signals, many types of groups are continuously transmitted. As shown in FIG. 3 (2), for example, a PI code representing a program of another network different from the currently received program is placed in the area 47.
AF codes representing a plurality of carrier frequencies broadcasting a program corresponding to the PI code are included in the area 48, for example.

FIG. 4 is a block diagram showing a configuration of the demodulation circuit 8.
Hereinafter, an operation of demodulating an RDS signal into an RDS digital signal will be described.

High frequency amplification mixing circuit 1 and intermediate frequency amplification detection circuit 2
The RDS signal detected by the bandpass filter (B
Unnecessary frequency components are removed by the PF 21, and only a frequency around 57 kHz is waved. The RDS signal oscillated by the BPF 21 is converted into two-phase PSK (Phas) by a 57 kHz subcarrier reproduced by a 57 kHz subcarrier regeneration circuit 26.
e Shift Keying) In the signal demodulation circuit 22, the signal is demodulated into a two-phase PSK signal. The two-phase PSK signal is output to the clock generation circuit 27 and the analog / digital (A / D) converter 23. The clock generation circuit 27 generates a clock signal of, for example, 1187.5 Hz used in the RDS and outputs the clock signal to the A / D converter 2.
3 and output to the correction circuit 24.

The digital signal from the A / D converter 23 is synchronized with the clock signal from the clock generation circuit 27 by the correction circuit 24, and the output signal is corrected by the above-described check word and the like.
Given to 25. In this way, the RDS digital signal collected for each block is derived from the output circuit 25 to the control circuit 9.

FIG. 5 is a block diagram showing a configuration of the control circuit 9. The input determination unit 31 determines whether the RDS digital signal from the demodulation circuit 8 is correct data. That is, only the data that could be corrected by the correction circuit 24 is output from the input determination unit 31 to the analysis unit 32. Analysis unit 32
In, various codes included in the RDS digital signal are classified,
Will be analyzed.

In the present embodiment, the analysis unit 32 sends the EON code of the RDS digital signal to the EON code input / output unit 34.
In addition, a signal from the key input unit 12 is input to the mode determination unit 33, and various operation modes of the radio receiver 20 are determined.
The output of the mode determining unit 33 is provided to an EON code input / output unit 34. A signal line from the intermediate frequency amplification detection circuit 2
The signal via 17 is supplied to a reception sensitivity determination unit 36, and the reception sensitivity (electric field strength) of the currently tuned broadcast is determined. The output of the receiving sensitivity determining section 36 is also supplied to the EON code input / output section 34. The EON code input / output unit 34 stores the EON code from the analysis unit 32 in the memory 35. Also EON
The signal representing the frequency included in the code is output from the EON code input / output unit 34 to the tuning control unit 37, and the tuning control unit 37
Derives a signal to the high-frequency amplification / mixing circuit 1 via the signal line 19, thereby tuning to the frequency represented by the signal input to the tuning control unit 37. EON code input / output unit 34
Sends, for example, a signal indicating the name of the currently received broadcast station to the character information output unit 38. Character information output section
38 outputs a signal for displaying characters such as “BBC R1” to the display unit 10.

FIG. 6 is a flowchart for explaining the operation of storing the EON code in the radio receiver 20. In step a1, it is determined whether or not the radio receiver 20 is set to the EON code monitor mode by operating the select button 13. If the monitor mode has been set, the process proceeds to step a2. In step a2, the RDS data signal is received by the radio receiver 20. In step a3, it is checked whether or not the received RDS data contains an EON code. If the EON code is included, the process proceeds to step a4, and the variable n is set to “1”.

In step a5, the PI code PIn of another network included in the EON code is read and compared with the PI code stored in the memory 35, and in step a6, the PI code PIn is already stored in the memory 35. Judge whether it is. If the PI code PIn is not stored in the memory 35, or if no PI code is stored in the memory 35, the process proceeds to step a7.

In step a7, the read PI code PIn of the other network is stored in the memory 35, and subsequently in step a8, the PS code of the other network corresponding to the PI code PIn
The (Programe Service) code (program name code) PSn is stored in the memory 35. In step a9, the PI code
Stores the AF code AFn of another network corresponding to PIn
Store in 35. In step a10, it is determined whether all the AF codes AFn of the other networks have been stored in the memory 35. AF of other network with PI code PIn
When all the codes have been stored, the process proceeds to step a11, 1 is added to the variable n, and the process returns to step a5. In step a10, if all the AF codes have not been stored in the memory 35, the process returns to step a9.

In step a6, the received PI code is stored in the memory 35.
If it is stored in step a12, the process proceeds to step a12. In step a12, it is determined whether all PI codes of other networks have been received. If all PI codes have not been received, the process returns to step a5. If all PI codes have been received, the process proceeds to step a13. In step a13, each of the plurality of stored PI codes is compared, and in step a14, based on the country code, the area code, and the program reference number constituting the PI code, the PI code, the PS code,
Store the AF code again.

FIG. 7 is a diagram showing a configuration of a PI code. The PI code is composed of three codes and is composed of 16-bit data. The first code is 4-bit data and is a country code indicating a country where the program is transmitted. The second code is also 4
It is bit data and is an area code representing the area where the program is transmitted. The third code is 8-bit data and is a program reference number. Fig. 7 (1) shows the PI
It represents the code "C201 _H", 7 (2) shows a PI code "DB 21 _H". Here, the first code and the second code are each represented by a hexadecimal number, and the third code is divided into an upper 4 bits and a lower 4 bits and each is represented by a hexadecimal number.

FIG. 8 is a diagram showing the contents stored in the memory 35. The memory 35 has a storage area corresponding to the preset buttons P1 to Pn.
ME1 to MEn are set. In each storage area, a PI code storage field, a PS code storage field, and an AF code storage field are set.

Each of the storage areas ME1 to MEn is provided for each PI code to be stored, and a PI code, a PS code, and an AF code are stored for each PI code as described later.

As shown in FIG. 8 (1), the steps shown in FIG.
by the operation of a5~ step a12, respectively in a memory area ME1～ME4 PI code "C201 _H", "D801 _H", "C20
4 _H "shall PI code of the network with" C520 _H ", PS code, AF code is stored.

In step a13 of FIG. 6, the storage area ME1
Compare the PI code stored in .about.ME4 in the order of country code, area code, and program reference number. First,
By comparing the country codes, the various codes of the network of the PI code “D801 _H ” stored in the storage area ME2 are stored in the storage area ME4 as shown in FIG. 8 (2). Next, since the remaining three PI codes have the same country code, the area codes are compared. by this,
Various network codes of the PI code “C520 _H ” are stored in the storage area ME3 as shown in FIG. 8 (2).

Furthermore, since the remaining two PI codes have the same country code and area code, the program reference numbers are compared. As a result, the various codes of the network of the PI code “C204 _H ” are stored in the storage area ME2, and the various codes of the network of the PI code “C201 _H ” are stored in the storage area ME1 as it is. Therefore, various codes are stored in ascending order of PI code, that is, in ascending order of country code, area code, and program reference number.

FIG. 9 is a diagram of each network stored in the memory 35.
6 is a flowchart for explaining an operation of checking the reception sensitivity of a broadcast of the frequency based on the AF code. In step b1, the variable m is set to "1". In step b2, the PI code PIm and the AF code AFm stored in the storage area MEm of the memory 35 are read. In step b3, based on the read AF code AFm, the frequency represented by the AF code is received, and the reception sensitivity is confirmed.In step b4, the reception sensitivity received in step b3 is converted to each frequency, that is, each AF. The code is stored in the memory 35 for each code.

In step b5, 1 is added to the variable m, and in step b6, it is determined whether the reception sensitivity of the frequency represented by the AF code has been confirmed. If all the broadcasts have not been received, the process returns to step b2, and if all the broadcasts have been received, the process ends.

The above-described operation of checking the reception sensitivity is performed, for example, by using the radio receiver 20.
When installed in a car, the reception sensitivity changes with the movement of the car, so the steps b1 to b6 are performed at regular intervals, for example, every 30 seconds, and the latest reception sensitivity is stored in the memory as much as possible. Need to store in 35.

FIG. 10 is a flowchart for explaining a channel selection operation in the radio receiver 20 when a preset button is operated to select another network. In step c1, it is determined whether a preset button for selecting another network has been pressed. If the preset button has been pressed, the operation proceeds to step c2, in which the mute circuit 4 cuts off the audio output, and a so-called muting operation is performed. In step c3, it is checked which preset button has been pressed.
Set to the number of the preset button that was pressed. That is, when the preset button P3 is pressed, 1 = 3 is set.

In step c5, PI code PI determined by variable l
The PS (program name) code PSl corresponding to l is read from the memory 35. Subsequently, in step c6, the AF code AFl corresponding to the PI code PIl and the code representing the reception sensitivity stored corresponding thereto are read from the memory 35, and
In c7, the AF code AFlmax with the highest reception sensitivity is selected from a plurality of AF codes. In step c8, tuning is performed to the frequency represented by the selected AF code AFlmax, and in step c9, a program name corresponding to the PS code PS1, for example, "BBC R2" is displayed on the display unit 10. In step c10, the muting operation by the mute circuit 4 is released, and the broadcast of the selected network can be heard.

As described above, according to the present embodiment, the listener of the radio receiver 20 can select a desired program with a simple operation and receive the program in the best reception state. And operability is remarkably improved. Therefore, for example, when the radio receiver 20 is mounted on a car or the like,
The safety is greatly improved.

Although the present embodiment has been described with reference to the FM broadcast in which the RDS signal is multiplexed, if the same code signal as the RDS digital signal is multiplexed in the broadcast, the broadcast should be performed in connection with another broadcast, for example, a television broadcast. Can be.

Effect of the Invention As described above, according to the present invention, a desired program can be selected with a simple operation and can be received in the best reception state, so that the convenience and operability of the receiving apparatus are significantly improved. You. Therefore, when the present invention is applied to, for example, an in-vehicle receiver, the safety is remarkably improved.

In particular, according to the present invention, identification information for identifying a program related to another network different from the own network included in the code signal data transmitted by each broadcasting station, and the broadcasting stations constituting each network corresponding to the identification information Frequency information is stored in a storage area provided for each identification information of the memory, and this storage area individually corresponds to the preset button, and each storage area corresponds to one identification information and the identification information. The frequency information forming each network and the reception sensitivity detected corresponding to each frequency information are stored, and the storage operation is performed in each storage area in units of identification information. When the preset button is operated, the frequency information having the highest reception sensitivity stored in the storage area corresponding to the operated preset button is selected and tuned, and the network program corresponding to the preset button is thus tuned. Reception can be performed by broadcasting at a frequency that provides the highest reception sensitivity. As a result, the best reception state of the desired network can be quickly obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a radio receiver 20 according to one embodiment of the present invention, FIG. 2 is a diagram showing a frequency spectrum of an FM modulated wave in which an RDS signal is multiplexed, and FIG.
FIG. 4 shows a configuration of an RDS digital signal, and FIG.
5 is a block diagram showing the configuration of the control circuit 9, and FIG. 6 is a block diagram showing the EON in the radio receiver 20.
Flowchart for explaining the code storing operation,
FIG. 7 is a diagram showing the configuration of the PI code, FIG. 8 is a diagram showing the contents stored in the memory 35, and FIG. 9 is a diagram for explaining the operation of confirming the reception sensitivity of the broadcast of the frequency corresponding to the stored AF code. FIG. 10 is a flowchart for explaining the channel selection operation in the radio receiver 20. 8 demodulation circuit, 9 control circuit, 12 key input unit, 20 radio receiver, 33 mode determination unit, 34 EON code input / output unit, 35 memory, 36 reception sensitivity determination unit, 37 tuning Control part, P1 ~ Pn… Preset button

Continuation of front page (56) References JP-A-60-1403029 (JP, A) JP-A-1-54942 (JP, A) JP-A-1-149527 (JP, A) JP-A-1-160221 (JP) JP-A-1-202030 (JP, A) JP-A-1-208030 (JP, A) JP-A-1-276828 (JP, A) JP-A-1-320828 (JP, A) 1-107231 (JP, U)

Claims (1)

(57) [Claims] 1. A plurality of broadcasting stations for broadcasting the same program constitute one network, and such a network comprises:
Each broadcast station transmits code signal data together with its own program, and the code signal data is used to identify programs related to the same network as its own and other networks different from its own. A receiving device for receiving the program and the code signal data, including identification information, and frequency information indicating a frequency of a broadcast station constituting each network corresponding to the identification information; (B) frequency information detecting means for detecting frequency information included in each received code signal data; (c) frequency information detecting means for detecting frequency information included in each received code signal data; (D) a plurality of preset buttons, and (e) corresponding to each of the preset buttons. A memory provided for each piece of identification information to be stored; and (f) responding to each output of the identification information detection means, frequency information detection means, and reception sensitivity detection means, When the received code signal data includes identification information and frequency information of another network different from the received broadcast network, the identification information and frequency information are stored in each storage area of the memory in units of identification information. And performs a reception operation based on the stored frequency information, stores the reception sensitivity detected in the reception operation in the memory in association with each frequency information, and responds to the output of the preset button. When the preset button is operated, the highest frequency of the reception sensitivity stored in the storage area of the memory corresponding to the preset button. Control means for selecting information and tuning to the selected frequency.