JPH10200379A - Data multiplex transmitter/receiver and tuning method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable tuning based on a program identification code similar to a data multiplex broadcasting station even at a broadcasting station, to which data are not sent, by relatively storing the frequency of nonmultiplex station and the program identification code in a memory by a user beforehand even in the area where the data multiplex broadcasting station and the non- multiplex station are mixedly existent. SOLUTION: The relation between a provided PTY code and frequency data is previously stored in a RBDS station storage area 32-1 of RAM 3-2 and searching is performed out of them. When inputted electric field strength is a receivable level, its frequency is received and when RBDS data are demodulated from an RBDS data demodulating means 6, whether it is that PTY code or not is judged to receive that station. When it is desired to listen to any station except for that station, the PTY search is continued again. Thus, even at the non-multiplex station, the PTY search is enabled similarly to the RBDS station.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] 1. Field of the Invention [0002] The present invention relates to a data multiplex broadcasting receiver for searching for a broadcasting station using program type identification code data and a method of selecting the same.

[Prior art]

2. Description of the Related Art Conventionally, broadcasting services have been provided by multiplexing data with ordinary broadcast waves, and in Europe, they have been put to practical use in radio broadcasting as RDS (Radio Data System). In the United States, RBDS (Radio Broadcas)
t Data System), and a broadcasting service has recently been started.

[0003] Each of these is a system in which data such as program identification information (PI code) and program type code (PTY) are multiplexed on a normal composite stereo signal and broadcasted. In particular, the PTY code which is a program identification code is: It is a code representing the contents specific to the program, such as MUSIC, NEWS, SPORTS and the like. Therefore, since the receiver that has received the broadcast wave can demodulate the PTY code of the program and search for the program using the code, the user can search and select a desired broadcast station by a simple operation. Bureau,
A radio receiver capable of performing a so-called PTY search has been developed.

FIG. 5 shows an RDS receiver as a conventional data multiplex broadcast receiver, and particularly the operation of a PTY search will be described. Frequency synthesizer receiving means 2 for antenna 1
Is connected, receives a station having a broadcast frequency corresponding to the frequency data (frequency division ratio data) input from the microcomputer 3, and outputs an audio signal.

[0005] In the frequency synthesizer receiving means 2, after the received signal of the antenna 1 is amplified by the high frequency amplifier 2-1, the local oscillator signal input from the PLL circuit 2-2 and the mixer 2
-3 to form an intermediate frequency signal. The PLL circuit 2-2 generates a local oscillation signal having a frequency corresponding to the frequency data input from the microcomputer 3, and outputs the signal to the mixer 2-3. The intermediate frequency signal is supplied to the intermediate frequency amplifier 2
-4, amplified by the FM detector 2-5, and
An M detection signal is output. The FM detection signal is separated into left and right audio signals by a multiplex circuit 24 and output as an audio signal via a mute circuit 4.

An electric field strength detection circuit 5 is connected to the intermediate frequency amplifier 2-4, which performs DC detection on the intermediate frequency signal and outputs an electric field strength detection signal. This electric field strength detection signal is output to the microcomputer 3.

The output of the FM detector 2-5 is connected to RDS data demodulation means 60. The RDS data demodulation means demodulates the RDS data from the FM detection signal. The RDS data demodulating means 60 includes an RDS data demodulator 60-1 and a signal processing circuit 60-2. The RDS data demodulator 60-1 extracts digital data and a bit clock from the received broadcast wave, and outputs a signal processing circuit 60-2.
Is used for digital data using a bit clock.
It performs synchronization detection, RDS data extraction, and correction.
The synchronization detection function in the RDS data demodulation means 60 is RD
It has a meaning as an S station detection function.

A display 7 and a KEY 8 for operation are connected to the microcomputer 3. The display 7 is composed of, for example, eight segments of light-emitting diodes.
It is composed of a 6-character display panel, a liquid crystal panel, an FL tube and the like. The KEY 8 includes keys (not shown) required for issuing commands to the microcomputer, such as a PTY mode key, a preset key, and a menu feed key.

The PT of the RDS receiver configured as described above
The Y search operation will be described below. User is KEY8
The user presses a PTY key for setting a PTY mode (not shown), and then inputs a desired PTY code. Then, in order to perform a frequency search by pressing a search key (not shown), data is set in a PLL circuit in the microcomputer and the first receivable frequency is set. During this time, the mute circuit 4 is turned on so as not to output unnecessary noise based on a command from the microcomputer 3.

A broadcast station is received at a set frequency, but an electric field strength detection circuit 5 connected to an IF amplifier 2-4.
To determine whether the station is a receivable broadcast station, and if receivable, waits for data from the RDS data demodulation means. When the comparator provided in the microcomputer 3 receives the PTY code and determines that it matches the PTY code of the user, the mute circuit 4 is turned off to output an audio signal. If it is determined that they do not match, the next frequency data is set in the PLL circuit 2-2. In this way, the user can receive a desired broadcast station based on the PTY code.

[0011]

However, it is up to the broadcaster to decide whether to provide a service by multiplexing the above-mentioned data with the broadcast. In areas where stations and non-multiplex broadcasting stations that do not perform data multiplex broadcasting are mixed, effective channel selection cannot be performed, and in areas where non-multiplex broadcasting stations are overwhelmingly large, a PTY search function can be performed on the receiver. However, there is a problem that it is difficult to use.

[0012]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a multiplex data broadcast receiver according to the present invention has a program type identification code for identifying a program type. Input means for receiving the data multiplex broadcast wave on which data including the program type identification code is multiplexed, and demodulation means for demodulating the program type identification code when receiving a data multiplex broadcasting station. In a data multiplex broadcasting receiver having channel selection means for selecting a channel based on the selected program type identification code, a frequency of a non-multiplexed broadcasting station on which no program type identification code is multiplexed is associated with a predetermined program type identification code. Storage means for storing the program identification code broadcasted by the data multiplex broadcasting station and the frequency of the non-multiplex broadcasting station. It is obtained by configured to perform channel selection based on the program identification code stored in association.

[0013] Further, the storage means stores the frequency and the program type identification code in association with each other by operating the input means while receiving a broadcasting station to which the program type identification code is not multiplexed. It is configured as follows.

Further, when a program identification code is inputted by the input means, the channel selection means performs a channel selection based on the program identification code associated with the frequency of the non-multiplexed broadcasting station, and then performs a data multiplexing broadcasting station. Is selected.

The tuning method according to the present invention includes:
When a program identification code is input by the operation of the input means and the channel selection is started by the operation of the channel selection means, a channel is selected based on the program identification code associated with the frequency of the non-multiplex broadcasting station, and the corresponding program is selected. When there is no broadcast station having the identification code, or after selecting all non-multiplexed broadcast stations that can be selected, the operation shifts to selecting a data multiplexed broadcast station.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a data multiplex broadcasting receiver according to the present invention will be described below. FIG. 1 is a block diagram of an embodiment of a data multiplex broadcasting receiver according to the present invention.
FIG. 6 is a diagram illustrating a DS receiver, which is substantially the same as the configuration of the RDS receiver of FIG. 5 except that the RBDS data demodulation means of FIG.

FIG. 2 is a functional block diagram of the microcomputer 3 and its peripheral circuits. The microcomputer 3 includes a PLL data setting means 3-1 for transmitting data to be set to the PLL circuit 2-2, and a RAM 3-2 for storing a PTY code and a frequency. RBDS station area 3-2-1 for functionally storing data on RBDS stations in RAM 3-2.
And a non-RBDS station area 3-2-2 for storing data on the non-RBDS station, and determining whether the PTY code input from the RBDS data demodulation means 6 matches the PTY code input from the KEY8. , And a comparison unit 3-2-3 for comparing the PTY code input from the KEY 8 with the PTY code stored in the non-RBDS station area.

RBDS station area 3-2-1 and non-RBD
The S station area 3-2-2 is an area for storing a PTY code and a frequency in association with each other. RBD
When receiving the S station, the frequency data of other stations and PT
The Y code may be multiplexed and broadcast. In such a case, the current PTY code of another station is changed to the RBDS station area 3.
-2-1. Also, RAM3
-2 and the PLL data setting means 3-1 are bidirectionally connected to each other so that the frequency data can be stored in the RAM 3-2 and that the frequency data corresponding to the PTY can be transmitted to the PLL data setting means. I have. Note that K
The EY 8 includes a memory key 8-1, and the following processing can be performed by pressing the key.

For the RBDS receiver configured as described above, (1) PTY memory processing and (2) PTY search processing will be described below.

(1) PTY memory processing The operation for setting NEWS with a PTY code in a non-multiplexed broadcasting station in the PTY memory mode by the configuration shown in FIGS. 1 and 2 will be described with reference to the flowchart of FIG. explain. For example, assume that a 98.1 MHz broadcast station was a non-multiplex station. First, the RBDS receiver is set to 98.1 MHz, and the broadcast station is received (step S11).

In the state of receiving, by a KEY operation,
For example, when a PTY mode key (not shown) is pressed, the PTY mode is turned on (step S12).
Next, a PTY genre (MU) is operated by operating a predetermined key.
SIC, SPEECH, NEWS, SPORTS, CL
ASSIC, JAZZ, etc.), set to NEWS (step S13), and press the memory key 8-1 to set the current PLL in the non-RBDS station area of the RAM 3-2.
The data is stored together with the state set by the data setting means 3-1 (step S14).

After the memory operation is completed, the PTY mode key is pressed again (step S15), whereby the PTY mode key is pressed.
Memory is completed. Thus, the non-multiplex station 98.
This means that the 1 MHz broadcast station is stored in the receiver as the PTY code "NEWS", so that when performing the PTY search described below, the
The search for the TY code "NEWS" becomes possible. By the same processing, other PTY codes can be set in addition to NEWS.

(2) PTY Search Processing Next, the operation when the PTY search is performed by the configuration shown in FIGS. 1 and 2 will be described with reference to the flowchart of FIG.

When a user wants to listen to a broadcast of a specific genre during reception of a radio broadcast, the user enters a PTY mode state by pressing a PTY mode key, and then sets a PTY genre by operating a predetermined key. For example, NEWS
(Step S21).

In response to this key operation, the microcomputer operates the non-RBDS station area 3-2-2 in the RAM 3-2 by pressing a search key (not shown) during the PTY mode.
Is searched for the PTY code "NEWS" associated with the frequency of the non-multiplex station stored in the memory (step S22), and the NE is stored in the memory by the comparing unit 3-2-3.
It is determined whether there is a WS (step S23). If there is no NEWS in the memory, the process proceeds to step S26. If there is NEWS in the memory, a setting request signal is issued to the PLL data setting means 3-1 and the PLL circuit 2-2 is received to receive the station. Set.

In this case, it is determined through the electric field strength detection circuit 5 obtained from the IF amplifier 2-4 whether or not the station can receive (step S24). If the level is not receivable, the process returns to step S22, and the above operation is repeated again. If receivable, the mute circuit 4 is released and an audio signal is output (step S25).

If the user wants to continue listening to the station, the procedure ends. If the user does not want to listen to the station, step S22 is repeated.
If the search key is depressed, the above operation is repeated.

On the other hand, if there is no station in the non-RBDS station area 3-2-2 in the RAM 3-2 in step S23, a normal so-called PTY search is performed in step S26.

That is, the association between the frequency data and the PTY code obtained from the RBDS station currently performing the frequency search or received is stored in the RBDS station storage area 3-2-1 of the RAM 3-2 in advance. (Step S26), and if the electric field strength input from the electric field strength detection circuit 5 is at a receivable level (step S2).
7) receiving the frequency and using the RBDS data demodulating means 6
If the RBDS data is demodulated from
It is determined whether or not the TY code is NEWS (step S28), and the mute circuit 4 is released to output an audio signal and receive the station (step S29).

If the user wants to listen to the station, the process ends. If the user wants to listen to a station other than the station, the search key is pressed again to continue the PTY search. This allows
Even a non-multiplex station can perform a PTY search in the same manner as an RBDS station.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is capable of all modifications within the scope disclosed in this specification. For example, in the embodiment, the case where the PTY code is NEWS has been described, but of course, another PTY code may be used.

In addition, the technique of searching for a non-multiplexed station with priority has been described, but various PTY codes and frequency data are fetched into the RBDS station area 3-2-1 in the RAM 3-2 during reception of the RBDS station. In this case, the PTY is determined based on the RBDS station area 3-2-1 and the comparison unit 3-2-3.
A search can be performed.

In this case, the non-RBDS station area 3-2
-2 first, then RBDS station area 3-2-
RBDS station area 3
The search may be performed in ascending order of frequency without dividing -2-1 and non-RBDS station area 3-2-2.

[0034]

As described above, according to the present invention, even in an area where data multiplex broadcasting stations and non-multiplex stations coexist, the user can associate the frequency of the non-multiplex station with the program identification code in advance and store it in the memory. Thus, even in a broadcasting station to which no data is transmitted, it is possible to select a station using a program identification code similar to that of a data multiplex broadcasting station.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a functional block diagram of the inside of a microcomputer 3 in FIG. 1 and a connection diagram with peripheral circuits.

FIG. 3 is a flowchart illustrating an operation of a PTY memory process according to an embodiment of the present invention.

FIG. 4 is a flowchart illustrating an operation of a PTY search process according to an embodiment of the present invention.

FIG. 5 is a block diagram showing an RDS receiver as a conventional data multiplex broadcast receiver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 Frequency synthesizer receiving means 2-1 High frequency amplifier 2-2 PLL circuit 2-3 Mixer 2-4 IF amplifier 2-5 FM detector 2-6 Multiplex circuit 3 Microcomputer 3-1 PLL data setting means 3 -2 RAM 3-2-1 RBDS station area 3-2-2 Non-RBDS station area 3-2-3 Comparison unit 4 Mute circuit 5 Electric field strength detection circuit 6 RBDS data demodulation unit 6-1 RBDS data demodulator 6-2 Signal processing circuit 7 Display 8 KEY 8-1 Memory key

Claims (4)

[Claims] 1. An input means for inputting a program type identification code for identifying a program type, and a program type when a data multiplex broadcasting station for broadcasting a data multiplex broadcast wave on which data including the program type identification code is multiplexed is received. In a data multiplex broadcast receiver having demodulation means for demodulating an identification code and having a channel selection means for selecting a channel based on the program type identification code input by the input means, no program type identification code is multiplexed. A storage unit for storing the frequency of the non-multiplex broadcasting station and a predetermined program type identification code in association with each other is provided, and the channel selection unit stores the program identification code broadcast by the data multiplex broadcasting station and the frequency of the non-multiplex broadcasting station. A data multiplex broadcast receiver for performing channel selection based on a program identification code stored in association with the data multiplex broadcast receiver. 2. The method according to claim 1, wherein said storing means stores a frequency and a program type identification code in association with a frequency by operating said input means while receiving a broadcasting station on which no program type identification code is multiplexed. The data multiplex receiver according to claim 1. 3. When a program identification code is input by said input means, said tuning means performs a tuning based on a program identification code associated with a frequency of a non-multiplex broadcasting station, and then selects a data multiplex broadcasting station. The data multiplex broadcasting receiver according to claim 1 or 2, wherein a channel selection is performed. 4. A program identification code is input by operating the input means, and when a channel selection is started by an operation of the channel selection means, a channel selection based on the program identification code associated with the frequency of the non-multiplex broadcasting station is performed. The method according to claim 1, wherein if there is no broadcast station having the corresponding program identification code, or after selecting all selectable non-multiplex broadcast stations, the operation shifts to data multiplex broadcast station selection. A channel selection method in the data multiplex broadcast receiver according to claim 3. [0001]