JP3504817B2 - Seek method of radio receiver - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seek method for a radio receiver, and more particularly to an audio signal of a predetermined program and program type information indicating the contents of the program. The present invention relates to a seek method for a radio receiver that receives a broadcast signal. 2. Description of the Related Art R which has been put to practical use in Europe
DS (Radio Data System) is a system in which various digital data are superimposed on an FM broadcast signal, and a message (RDS data) includes (i) a program (broadcast program) identification data ( PI) (ii) Broadcast station name data (PS) (iii) Broadcast station frequency list during the same program broadcast (AF) (iv) Program content identification data (PTY) (V) Transmission state identification data (DI) ( vi) identification data of music or conversation (M / S data); (vii) identification data of a traffic information broadcasting station (TP data); (viii) identification data during traffic information broadcasting (TA data). The above (i) to (vi) are information related to the channel selection function, and (vii) to (viii) are traffic information. The program content identification data (program type code) PTY is represented by 5 bits, and the relationship between the code and the program content (genre) is shown in FIG.
It is shown as follows. [0003] As described above, RDS receives F
Since a message (RDS data) relating to the M broadcast is frequency-multiplexed and transmitted, a unique tuning operation and display operation can be performed using the message. For example, if the received signal strength of a broadcast signal being received falls below a certain value due to the movement of a car, the reception is performed using the AF list so as to receive a broadcast signal of the same program with a good received signal strength. Broadcast signals can be automatically switched (automatic tracking). Further, the broadcast station name (PS data) included in the RDS data can be extracted and the name of the RDS broadcast station being received can be displayed on the display unit of the radio receiver. [0004] On the other hand, digital broadcasting has recently become active in audio broadcasting, and digital audio broadcasting DAB (Digital Audio Broadcasting) is being put to practical use. Also in such DAB broadcasting, a broadcast signal and various information are frequency-multiplexed and transmitted. Figure 7 shows DAB
This is a mode II frame structure adopted in the system. One frame length is 24 ms, and a 2-symbol synchronization section SYNC and a 3-symbol high-speed information channel section F are used.
It consists of an IC (Fast Information Channel) and a data field part DFL of 72 symbols. Synchronization unit S
The YNC contains a null symbol and a phase reference symbol PRS used to recognize the start of a frame.
In the high-speed information channel unit FIC, time / date data, service arrangement data, service name (label), service identification code SId (Service Identifier), and program type code (PTY; program type) indicating program contents are provided.
Coding) is inserted, and C for error correction is added at the end.
RC is added. Data field part DFL is 7
It is divided into two data fields, and a broadcast signal of a predetermined service is inserted in each data field, so that one broadcast station can simultaneously transmit six to eight services. Which service corresponds to which data field is specified by the array data of the service included in the high-speed information channel unit FIC. The program contents can be identified from program type information FIG0 / 17 (Type 0 field for extension 17) included in the high-speed information channel section FIC. FIG. 8 shows the program type information FIG0 / 17 (Type 0 field for extension) included in the high-speed information channel section FIC.
It is explanatory drawing of 17). This program type information
Service identifier SId (Service Ident
ifier), S / D (Stat indicating whether or not a program type code described later is the program type code of the current program)
ic / Dynamic) flag, reserved area Rfa, Rfu, number of coarse codes (NCC), number of fine codes (NFC), NFC number of fine codes, program type code Int Code (international code is the same as RDS) Program type code system) coarse PTY code
Coarse Code, fine PTY code
(Fine Code). The Fine Code specifies the genre finely, and the Coarse Code roughly specifies the genre, and is selected from an international code or a domestic code, respectively. Fine Code
Receivers that are not compatible with Coarse Cod
Use e). [0006] Incidentally, there is a case where it is desired to receive a broadcast of a predetermined program content (genre) in an RDS radio receiver or a DAB radio receiver.
In such a case, conventionally, the user seeks an RDS broadcast station or a DAB broadcast station having a good reception state by a seek operation, listens to the broadcast from the broadcast station, determines whether or not the broadcast is of a desired genre, and determines a desired genre. If not, the seek operation is repeated to finally receive a broadcast of a desired genre. However, in the conventional seek selection method, there are a large number of RDS broadcast stations (DAB broadcast stations will increase in the future). Therefore, there is a problem that a great deal of time and operations are required until a desired broadcast can be heard. In view of the above, it is an object of the present invention to remove broadcasts of a genre that the user does not want to listen to from the selection of a seek in advance, and to reduce the time required until the broadcast of the desired genre can be heard. [0007] According to the present invention, the above object is achieved by setting a program type according to the program contents that the user does not want to listen to.
Preset one or more steps, DAB release with good reception condition
When seeking and receiving a transmission issue, seeked DAB release transmission
Demodulates the program type information of all services included in the issue
Steps to be performed and the program type of each demodulated service
Matches the preset program type
Steps to check, if matched, next receipt
Seeks a good broadcast signal, and
If there is a type of
A step to output a DAB broadcast signal broadcast according to the service
This is achieved by a seek method of a radio receiver having a loop. FIG. 1 is a block diagram of an RDS radio receiver to which a seek method according to the present invention can be applied. 1 is an antenna, 2 is a front end, and generates an intermediate frequency signal (IF) in synchronization with a predetermined broadcasting station based on a voltage signal output from a PLL circuit described later. An intermediate frequency amplifier 3 amplifies the intermediate frequency signal converted by the front end 2 to a predetermined level. Reference numeral 4 denotes a stereo demodulation circuit (MPX), which demodulates an intermediate frequency signal input from the intermediate frequency amplifier 3 into a stereo signal. 5 is mu
6 is an amplifier (AMP), 7 is a speaker,
The sound is output by being driven by the amplifier 6. Reference numeral 8 denotes a 57 KHz band-pass filter (B
PF), and passes a 57 KHz subcarrier amplitude-modulated based on the RDS data. Reference numeral 9 denotes an RDS decoder, which outputs AF data, P
Demodulates I data, PS data, PTY data and the like. 1
Reference numeral 0 denotes an error correction circuit, which outputs RDS data (AF data, PI data, PS data) demodulated by the RDS decoder 9.
Data, PTY data, etc.) are detected while synchronizing each group, and the errors are corrected. Numeral 11 indicates that the current receiving station has an RDS based on the output signal of the bandpass filter 8.
An RDS station detection circuit 12 for outputting a signal SDT indicating whether the station is a station or not. Reference numeral 12 denotes a signal meter, which monitors the signal strength of the intermediate frequency signal output from the intermediate frequency amplifier 3 to determine the level of the reception state of the receiving station ( Received electric field strength) is detected. A controller 14 controls the entire radio receiver, and executes a seek process according to the present invention as described later. The controller 14 includes a processor (CP
U) 14a, a program memory (ROM) 14b, a data storage memory (RAM) 14c, and the like. In the data storage memory 14c, one or more program type codes PTY corresponding to program contents (genres) that the user does not want to listen to are preset. By presetting the program type code PTY of the program content (genre) that the user does not want to listen to, the broadcast program can be excluded from the selection at the time of seek selection as described later. Reference numeral 15 denotes an operation panel, which has a display section 15a and an operation section 15b. The display unit 15a displays the name of the broadcasting station being received, and the like, and the operation unit 15b includes an up-seek key 15b-1, a down-seek key 15b-2, and a genre input key for setting program contents (genre) that the user does not want to listen to. 15b-3
Etc. are provided. Reference numeral 16 denotes a PL for inputting a voltage signal corresponding to the reception frequency data FDT input from the controller 14 to the front end 2 to tune to a predetermined broadcasting station.
This is an L circuit. FIG. 2 is a processing flow of the seek method of the present invention. Incidentally, before the seek operation, program contents do not want to hear by operating the genre input keys 15b-3 a (genre) type 1 or more, previously preset the program type code PTY ₁ ～PTYn the data storage memory 14c . When a seek is instructed by operating the up seek key 15b-1 or the down seek key 15b-2 at the time of tuning, the controller 14 changes the receiving frequency by a predetermined frequency width in the up direction or the down direction from the current receiving frequency to receive. A good broadcast signal is sought (step 101). At the time of seeking, the mute circuit 5 is controlled to be in a mute operation state, so that sound is not output from the speaker. The controller 14 takes in the received electric field strength of the received frequency from the signal meter 12 every time the received frequency is changed by the seek, and checks whether the received electric field strength is equal to or more than a set value (Step 102). If it is below the set level, the seek is continued,
If the level is equal to or higher than the set level, it is checked whether the current receiving station is an RDS station with reference to the output signal SDT of the RDS station detecting circuit 11 (step 103). If the current receiving station is not the RDS station, the controller 14 continues the seek, and if the current receiving station is the RDS station, demodulates the RDS data and extracts the program type code PTY included in the RDS data (step 104). Then, the extracted program type code P
TY checks if it matches the program type code PTY ₁ ~PTYn preset to the memory 14c (step 105). The program type code that matches the extracted program type code PTY is stored in the memory 1
If it exists in 4c, the seek is continued. On the other hand, if the matching program type code does not exist in the memory 14c, the mute operation of the mute circuit 5 is released, and a sound corresponding to the currently received broadcast signal is output from the speaker (step 106). Thereafter, the controller 14 monitors whether the user has performed a seek operation (step 107). If there is no seek operation, the controller 14 continues to output the audio of the currently received broadcast signal (step 1).
06) If there is a seek operation, return to the beginning and start the seek again. As described above, since the program contents of the genre that the user does not want to listen to are preset to exclude them from the selection of the seek, it is necessary to listen to the sound of the program contents that the user does not want to listen to during the seek. Since it is not necessary to judge whether the broadcast signal is unnecessary or not, the time required for seeking a broadcast signal of a desired genre can be shortened, and the seek operation can be simplified and the operation performance can be improved. Although the above is an application to an RDS radio receiver, the present invention can also be applied to a DAB broadcast radio receiver. FIG. 3 is a configuration diagram of a DAB receiver, 21 is an antenna, 22 is a tuner section that receives a broadcast signal from a designated DAB broadcast station and converts it into an intermediate frequency signal, and 23 is an I / O tuner.
An F filter 24 is connected to the S meter terminal of the IF filter and detects an electric field intensity of a DAB broadcast signal being received, and an S meter 25 is a DAB signal demodulator (see FIG. 4).
Reference numeral 6 denotes an audio decoding unit that decodes the MPEG audio data demodulated by the DAB signal demodulation unit into original PCM audio data, 27 denotes a DA converter that converts PCM audio data to analog, and 28 denotes a control unit that controls the entire receiver. , 29 are operation / display units, which are provided with an up seek key 29a, a down seek key 29b, a genre input key 29c for setting program contents (genre) that the user does not want to listen to, and the like. The DAB signal demodulation unit 25, as shown in FIG. 4, the orthogonal demodulation for orthogonal detection signals into an intermediate frequency signal to the reference carrier and reference carrier by 90 ⁰ phase shift output from the tuner unit 22 multiplies each , A digital-to-analog converter 52 that performs A / D conversion on a baseband frequency multiplexed signal output from the quadrature demodulator at a predetermined sampling frequency
A transmission line decoding circuit 53 that restores / outputs MPEG audio data by performing FT demodulation processing, decoding processing, and the like is provided. The transmission line decoding circuit 53 includes an FFT differential demodulation unit 53
a, a selective decoding unit 53b, and a deinterleave unit 53c. The FFT differential demodulation unit 53a performs an FFT process on the digital data output from the AD converter 52, and demodulates the interleaved transmission data. The deinterleaving unit 53c deinterleaves the output data of the FFT differential demodulation unit to return to the original data sequence, and the selective decoding unit 53b performs error detection and correction processing on the deinterleaved data and inputs the data to the control unit 28. The control unit 28 detects the symbol position (data field) of the program specified by the user based on the program sequence data included in the high-speed information channel unit FIC, and notifies the selective decoding unit 53b. The selective decoding unit 53b decodes the decoded data (M
PEG audio data) to the audio decoding unit 26. At the time of seeking, the control unit 28 extracts the program type code PTY included in the high-speed information channel unit FIC and executes the following seek processing. FIG. 5 is a flowchart of the seek process of the present invention in the DAB receiver. Before the seek operation, the user operates the genre input key 29c to input one or more program contents (genre) that the user does not want to listen to, and inputs the program type code PT
Y _{1 to} PTYn are preset in the memory 28 a of the control unit 28. When a seek is instructed by operating the up seek key 29a or the down seek key 29b at the time of tuning, the control unit 28 changes the receiving frequency by a predetermined frequency width from the current reception frequency to the up direction or the down direction, and performs good reception. The signal is sought (step 201).
At the time of seeking, a mute circuit (not shown) is controlled to be in a mute operation state, so that sound is not output from the speaker. Each time the control unit 28 changes the reception frequency by seeking, the control unit 28 takes in the reception electric field intensity of the reception frequency from the signal meter 24 and checks whether the reception electric field intensity is equal to or higher than a set value (step 202). If it is below the set level, the seek is continued,
If the level is equal to or higher than the set level, PTYs of all services included in the received DAB broadcast signal are demodulated (step 203).
Next, the P in which the PTY of each service is preset
It is checked whether it matches the TY (step 204). If the PTY of each service matches the predetermined preset PTY, the seek is continued. On the other hand, if there is a PTY service that does not match the preset PTY, the control unit 28
It controls the B signal demodulation unit 25, releases the mute, and outputs the broadcast audio of the service (step 205).
Thereafter, the control unit 28 monitors whether the user has performed a seek operation (step 206). If there is no seek operation, the control unit 28 continues receiving the DAB broadcast signal currently being received. If there is a seek operation, the output audio is muted, and it is checked whether the PTY of another service included in the currently received DAB broadcast signal matches the preset PTY (step 207). If all of them match the preset PTY, the process returns to step 201 to continue the subsequent seek. On the other hand, if there is something that does not match the preset PTY,
The DAB signal demodulation unit 25 is controlled, the mute is released, and the broadcast sound of the service is output (step 20).
8). Thereafter, the control unit 28 monitors whether the user has performed a seek operation (step 209). If there is no seek operation, the control unit 28 continues to receive the currently receiving DAB broadcast signal, and if there is a seek operation, repeats the processing from step 207. . As described above, the present invention has been described with reference to the embodiments. However, the present invention can be variously modified in accordance with the gist of the present invention described in claims, and the present invention does not exclude these. As described above, according to the present invention, the program contents of the genre which the user does not want to listen to are preset and excluded from the target of the seek selection. Since it is not necessary to listen to the voice of the user to judge whether or not reception is required, the time required for seeking a broadcast signal of a desired genre can be reduced, and
The seek operation can be simplified and the operation performance can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of an RDS radio receiver to which the present invention can be applied. FIG. 2 is a seek processing flow of the present invention. FIG. 3 is a configuration diagram of a DAB receiver to which the present invention can be applied. FIG. 4 is a configuration diagram of a DAB signal demodulation unit in the DAB receiver. FIG. 5 is a seek processing flow of the present invention in a DAB receiver. FIG. 6 is a correspondence table of PTY codes and program contents in RDS. FIG. 7 is a diagram illustrating the structure of a DAB signal frame. FIG. 8 is an explanatory diagram of program type information. Description of the sign] 12 ... signal meter 14 .. controller 14c ·· data storage memory PTY ₁ ~PTYn ·· program content PTY code you do not want to hear

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H03J 7/18 H04B 1/16

Claims (1)

(1) A seek method for a DAB radio receiver for receiving a broadcast signal in which an audio signal of a predetermined program and program type information indicating the content of the program are frequency-multiplexed. 1 more than the program type in accordance with the program contents do not want
And above preset, when the reception state is received by seeking good DAB broadcast signal, demodulates the flop <br/> program type information of all services contained in the seek the DAB broadcast signal, program type of each service demodulated Checks whether or not matches the preset program type, if it matches, seeks the next broadcast signal with good reception status, and if there is a mismatched program type,
A seek method for a DAB radio receiver, which outputs a broadcast of a DAB broadcast signal according to the service of the mismatched program type .