JP3148047B2 - Multiplex broadcast receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex broadcast receiver having a preset memory function, and more particularly, to a preset selection of both an RDS broadcast station and a non-RDS broadcast station which multiplex RDS data on an FM broadcast wave and broadcast. The present invention relates to a multiplex broadcast receiver that can be stationed.

[0002]

2. Description of the Related Art Radio Data System (RDS) is FM
Various kinds of digital data (RDS) related to broadcast information
Data) is frequency-multiplexed and broadcasted, and proposed by the European Broadcasting Union and put to practical use in European countries. Similar systems are also being considered in the United States. Table 1 shows RDS data.

[0003]

[Table 1]

[0004] Therefore, by utilizing such broadcast-related information and traffic information of the RDS data, it is possible to perform an automatic follow-up process for following the same program broadcasting station having a good reception state, and to acquire traffic information. it can.

In a multiplex broadcast receiver having a preset memory function, as shown in FIG. 8, presets are stored in a predetermined storage area of a memory corresponding to a plurality of preset keys (# 1, # 2,...). The received frequency data at the time, the program identification data (PI data) acquired from the received broadcast wave, and the related frequency data (AF data) are stored, and the PI data and AF data are stored in a storage area corresponding to the preset key.
When the data is stored, a broadcast station in a good reception state, which has the frequency given by the reception frequency data or the AF data at the time of preset channel selection and coincides with the PI data, can be set as the reception station. Also, by fetching RDS data acquired from the RDS broadcast wave of the receiving station and updating the data in the storage area corresponding to the preset key, the same program broadcasting station can be received with the latest data.

[0006]

However, in a conventional multiplex broadcasting receiver, if a non-RDS station that does not multiplex RDS data is preset, the following problem occurs.

That is, as shown in FIG. 9, first, at a point A, for example, a frequency of 94.7 MHz is set by a preset key # 2.
Preset key # when non-RDS station is preset
2 is stored in the storage area of the memory corresponding to the reception frequency 94.7.
Only the MHz is stored, and the PI data and the AF data are not stored.

Next, move to the point B and enter the preset key #
When a preset tuning (preset call) is performed in step 2,
The tuning frequency of the front end of the multiplex broadcasting receiver is 94.
Set to 7 MHz. At this time, if the broadcast station broadcasting at the same frequency of 94.7 MHz at point B is an RDS broadcast station, the multiplex broadcast receiver receives this RDS station.
Therefore, the RDS data multiplexed on the RDS broadcast wave is demodulated to obtain PI data (D622) and AF data (91.
4, 96.2,...) Are written in the storage area of the memory.

Next, when returning to the point A and performing preset tuning with the preset key # 2, data such as PI and AF are stored in the storage area of the memory corresponding to the preset key # 2. And frequency 9 received at point A
Since the PI code cannot be detected from the 4.7 MHz non-RDS broadcast wave, this non-RDS broadcast station is determined to be a different broadcast station from the preset station, and the AF station is determined based on the AF data stored in the preset memory. Search. And, for example, P
When the I code matches the PI code stored in the storage area of the memory, this AF station is selected as a new receiving station.

As described above, in the conventional multiplex broadcasting receiver, when an RDS broadcast wave is received when a preset non-RDS station is preset, the content of the memory is rewritten. Non-R
Even if a preset station is selected in a place where a DS station can be received, there is a problem that the non-RDS station cannot be received. In addition, the non-RDS broadcast is temporarily switched to the RDS broadcast of the same frequency depending on the time zone, and then the non-RDS broadcast is again performed.
A similar problem occurs when switching to broadcasting.

In view of the above problems, an object of the present invention is to provide a multiplex broadcast receiver capable of reliably and efficiently performing preset tuning of an RDS broadcast station and preset tuning of a non-RDS broadcast station.

[0012]

To achieve the above object, according to the present invention, there is provided a preset key, a memory, and a reception at the time of presetting in a first storage area of the memory corresponding to the preset key. Frequency data and related frequency data and program identification data obtained from received broadcast waves are stored, and when the program identification data and related frequency data are stored in the first storage area corresponding to the preset key, reception is performed at the time of preset channel selection. And a preset control unit for updating a data in the first storage area while setting a broadcast station in a good reception state which is a frequency given by the frequency data or the related frequency data and the program identification data coincides with the reception station. In the multiplex broadcasting receiver, the memory corresponds to a preset key, and the frequency data and the program identification data at the time of presetting are stored. The preset control unit writes a specific code as program identification data in the second storage area when the received broadcast wave does not include the program identification data at the time of presetting. At the time of tuning, the receiving station is determined by giving priority to the data stored in the second storage area. When the program identification code stored in the second storage area is a specific code, the receiving station is stored in the first storage area. Data that has been erased.

According to a second aspect of the present invention, in the multiplex broadcast receiver having the above configuration, the preset control unit stores program identification data other than the specific code in a second storage area corresponding to the preset selected preset key. Is stored, it is checked whether the received broadcast wave that matches the reception frequency data stored in the second storage area matches the program identification data stored in the second storage area, If they do not match, a receiving frequency given by the related frequency data stored in the first storage area and whose program identification data matches the program identification data stored in the second storage area is determined as a receiving station. It is characterized by doing.

[0014]

In the multiplex broadcast receiver according to the first aspect, when an RDS broadcast station is preset by a preset key, the reception frequency data of the RDS broadcast wave and the program are stored in a second storage area of a memory corresponding to the preset key. Identification (PI)
Data is stored in the first storage area of the memory.
Reception frequency data of the DS broadcast wave and related frequency data such as PI data and AF data acquired from the RDS broadcast wave are stored. Then, when a preset channel selection (calling a station) is performed using the preset key, the multiplex broadcast receiver receives the data based on the data stored in the second storage area or the data stored in the first storage area. It is possible to receive an RDS broadcast station in a good reception state that broadcasts the same program as the reception station at the time of presetting. Also, the RD
During reception by the S broadcast station, the data in the first storage is updated based on the RDS data obtained from the broadcast wave, so that the preset tuning can be efficiently performed based on the latest data.

On the other hand, when a non-RDS broadcast station is preset by preset operation of the preset key, the reception frequency data of the non-RDS broadcast wave is stored in the first storage area and the second storage area of the memory corresponding to the preset key. And a specific code is stored as program identification (PI) data. Then, when a preset channel is selected using the preset key, the PI data in the second storage area corresponding to the preset key is a specific code, so that the data in the first storage area is deleted. Therefore,
A broadcast station having a frequency that matches the frequency data stored in the second storage area can be received. At this time, if the received broadcast station is an RDS station, PI data and related frequency data obtained from the broadcast wave are written to the first storage area. After that, when preset tuning is performed at a point where a non-RDS broadcast station that matches the reception frequency at the time of presetting can be received, since the PI data in the second storage area is a specific code, the data in the first storage area Is erased. Therefore, a non-RDS broadcast can be received based on the preset frequency data stored in the second storage area.

Therefore, it is possible to reliably perform both the preset tuning of the RDS broadcasting station and the preset tuning of the non-RDS broadcasting station.

In the multiplex broadcast receiver according to the second aspect, when the preset station is an RDS station, first, an RDS broadcast station having a frequency matching the reception frequency data stored in the second storage area is received. When the PI data obtained from the RDS broadcast wave matches the PI data stored in the second storage area, the tuning is terminated, and when the PI data does not match, the related frequency stored in the first storage area is used. Since the receiving station is a receiving frequency given by the data and whose PI data matches the PI data stored in the second storage area, the RDS broadcasting station having the same PI as the preset RDS broadcasting station can be efficiently used. You can tune well.

[0018]

Embodiments of the present invention will be described below in detail.

FIG. 1 is a main block diagram showing the configuration of a multiplex broadcast receiver according to one embodiment of the present invention. The multiplex broadcast receiver can be used as, for example, a car radio, or integrated with a tape cassette, a deck, or the like, and used as a car audio. In the figure, 1 is an antenna, 2
Is a front end, which tunes to a predetermined broadcasting station based on a tuning voltage signal output from the PLL circuit 3 to generate an intermediate frequency signal (IF signal). An intermediate frequency amplifier 4 amplifies the IF signal output by the front end 2 to a predetermined level. 5 is a stereo demodulation circuit (MP
X), and demodulates the IF signal input from the intermediate frequency amplifier 4 into a stereo signal. Reference numeral 6 denotes a mute circuit, and reference numeral 7 denotes an amplifier (AMP). Reference numeral 8 denotes a speaker, and an amplifier 7
And outputs a sound.

9 is a 57 KHz band-pass filter (B
PF), which is modulated based on the RDS data.
Pass KHz sub-carrier. Reference numeral 10 denotes an RDS decoder, which outputs PI data,
Various data such as AF data is demodulated. Reference numeral 11 denotes an RDS data synchronization error correction circuit, which detects errors in RDS data such as PI data and AF data demodulated by the RDS decoder 10 while synchronizing each group, and corrects the errors.

Reference numeral 12 denotes a signal meter, which detects a received electric field intensity using an IF signal output from the intermediate frequency amplifier 3 and outputs a detection signal (SM). Reference numeral 13 denotes a station detector, which is a high-level station detect signal indicating that a receiving station is present when the received signal is within the frequency deviation Δf (bandwidth) of the received signal and the signal strength is equal to or higher than a predetermined level. (SD on) is output. Therefore, when the station detect signal SD is low level (SD
In the case of OFF), even if the signal strength detected by the signal meter 12 is large, the broadcast station at the tuning point does not actually exist, and it is determined that the detected signal strength is affected by the adjacent station. I do.

Reference numeral 14 denotes a controller constituted by a microcomputer, which includes a processor (CPU) 15, a program memory (ROM) 16, and a data memory (RAM).
17 and the like. Reference numeral 18 denotes an operation unit. Here, the operation section 18 is provided with six preset keys (# 1 to # 6). The controller 14 executes the program stored in the program memory 16 by the processor 15, and stores the Ps in the RDS data sequentially input in groups.
Broadcast-related information data such as I data and AF data is fetched from the error correction circuit 11 and stored in the data memory 17, and a program divider (not shown) of the PLL circuit 3 is selected based on a channel selection command from the operation unit 18. ), And tunes the front end 2 to a predetermined broadcasting station. Also, in addition to the preset control described later, for example, an automatic tracking process is performed using AF data, PI data, and the like included in the RDS data, and a traffic information broadcast is performed by a receiving broadcast station or a broadcast station of another network. Started when T
It is possible to automatically switch to a radio mode from another audio source (not shown) such as a tape using P, TA data or the like to listen to the traffic information.

Next, the preset control function of the multiplex broadcast receiver will be described in detail. As shown in FIG. 2, the data memory 17 stores preset station frequencies corresponding to preset keys # 1 to # 6, program identification data (PI data) obtained from the received broadcast wave, AF data, PS data, and the like. (Not shown), a current memory area 17a as a first storage area for storing a preset key # 1
To # 6, preset station frequency and program identification data (PI data) obtained from the received broadcast wave
Memory area 1 as a second storage area for storing
7b are formed. Here, the frequency and PI data stored in current memory area 17a are called current frequency and current PI, respectively, and the frequency and PI data stored in home memory area 17b are called home frequency and home PI, respectively.

The controller 14 has the program memory 1
6 to execute the processes shown in FIGS. 3 to 5 in accordance with the preset control program stored in FIG. That is, when one of the preset keys # 1 to # 6 is preset, as shown in FIG. 3, the broadcast station being received is first determined by whether or not RDS data has been input from the error correction circuit 11.
It is checked whether the station is an S broadcast station (step 101). R
When the station is a DS broadcast station, the reception frequency and PI data obtained from the broadcast wave are transmitted to the home frequency and home P, respectively.
I is stored in the home memory area 17b corresponding to the preset key, and the reception frequency and the PI data obtained from the broadcast wave correspond to the preset key together with the AF data and other PS data as the current frequency and the current PI, respectively. Is stored in the current memory area 17a (step 102).

On the other hand, if the station is a non-RDS broadcast station, the reception frequency and the specific code (for example, code 0000) as PI data are stored in the home memory area 17b and the current memory area 17a (step 103). This ends the preset. FIG. 2 shows an example in which an RDS station is preset using preset keys # 1 and # 3, and a non-RDS station is preset using preset key # 2.

Next, an operation in the case where one of the preset keys # 1 to # 6 is operated to select a preset channel will be described with reference to FIGS.

When receiving a preset channel selection command signal from the operation unit by operating the preset key, the controller 14 first sends a mute command signal to the mute circuit 6 to mute the audio output (step 201). Then, the home frequency data stored in the home memory area 17b corresponding to the preset key is given to the PLL circuit 3,
A tuning voltage is output from the LL circuit 3 to the front end 2 to tune the front end 2 to the home frequency (step 202). In step 203, it is checked whether the home PI in the home memory area is a specific code. If the code is a specific code, the preset station of the preset key is a non-RDS station. Therefore, after erasing all data in the current memory area in step 204, a mute release command signal is sent to the mute circuit 6 (step 206). Then, the preset channel selection processing ends.

On the other hand, in step 203, the home PI
If it is determined that the code is a code other than the specific code, the preset station of the preset key is an RDS station, so that PI data is obtained from the received broadcast wave after tuning,
It is checked whether or not the PI data matches the home PI (step 205). If it matches the home PI, the mute is released because the receiving station is the same broadcasting station as the preset station (step 206), and the preset station selection ends. When the PI data does not match the home PI, or when the received broadcast wave is a non-RDS broadcast wave and the PI
If the data cannot be obtained, the processing of FIG. 5 is performed.

That is, first, the current memory area 17a
Search for each AF station based on the AF data stored in the station, check the station detection (SD on) by the station detector 13 and check the signal meter 1 for each AF station.
2 (step 207), and among the AF stations stored in the current memory area 17a, those stations which have been detected are temporarily sorted in descending order of the received field strength (step 208). . Then, the search is performed sequentially from the AF station having the largest received electric field strength, and it is checked whether the PI data acquired from the broadcast wave of the AF station matches the home PI (step 20).
9). If they match, the mute is released with the AF station as the receiving station (step 206). If they do not match, it is checked whether the PI check has been completed for all AF stations (step 210), and the check is repeated until the PI check has been completed for all AF stations. When the PI data of all AF stations does not match the home PI in this way, in this embodiment, PI seek processing is performed (step 211). That is, a broadcast station in good reception condition transmitting the same PI data as the home PI by performing frequency seek is determined, and the broadcast station is set as a reception station.

FIG. 6A shows a non-RD with the preset key # 2.
This shows an example of a preset channel selection operation when the station S is preset. In the figure, when preset key # 2 is preset to a non-RDS station of 94.7 MHz at point A, data of frequency 94.7 MHz is stored in current memory area 17a and home memory area 17b, respectively, and current PI and PI are stored. A specific code (0000) is stored as each home PI.

Thereafter, when the mobile station moves to a certain point B of an RDS station (PI data: E622) having a frequency of 94.7 MHz and performs preset tuning with the preset key # 2, the home PI is a specific code. Memory area 1
All the data of the RDS station 7a is erased, and thereafter, the received frequency of the RDS station and data such as PI and AF obtained from the RDS broadcast wave are written to the current memory area 17a.

Thereafter, returning to the point A, when preset tuning is performed again with the preset key # 2, data such as PI and AF are stored in the current memory area 17a, but are stored in the home memory area 17b. Since the stored home PI is a specific code, the current memory area 17
Since all the data of the preset station are not erased, the search for the AF and the like are not performed, and the frequency 94.
A 7 MHz non-RDS station can be received.

FIG. 6B shows the RDS with the preset key # 1.
This shows an example of a preset channel selection operation when a station (PI data is E503) is preset. In the figure, first, preset key # 1 is set to 91.2 MHz at point C.
Preset to the RDS station of the current memory area 1
7a has a reception frequency of 91.2 MHz, PI data (E503) acquired from an RDS broadcast wave, and AF data (9
0.1, 95.3,...) Are stored, and the same reception frequency and PI data are stored in the home memory area 17b.

Thereafter, when the user moves to a certain point D of an RDS station (PI data is F301) having a frequency of 91.2 MHz and performs preset tuning with the preset key # 1, the home PI is not a specific code. The data in the memory area 17a is not deleted, and a home PI check is performed on the received broadcast wave. Here, since the PI of the received RDS broadcast wave is different from the home PI, the above-described AF search is performed, and for example, an AF station having a frequency of 90.1 transmitting the same PI as the home PI is regarded as a receiving station having a good reception state. Tuned. Then, the data in the current memory area 17a is updated to the data of the new receiving station.

Thereafter, returning to the point C, when the preset channel is selected again by the preset key # 1, the home frequency and the home PI at the time of the preset are stored in the home memory area 17b. Is prioritized, and the RDS broadcasting station at the time of presetting is selected as a receiving station. Then, the data in the current memory area 17a is updated to the data of the new receiving station.

FIG. 7 shows a modification of the tuning process shown in FIG. In FIG. 7, the processing from step 301 to step 304 is the same as the processing from step 207 to step 210 in FIG.
The I seek process is the same as the seek process in step 211 shown in FIG. In the embodiment of FIG. 7, all the detected A
After the home PI check for station F is completed, a broadcast station having the same frequency as the current frequency stored in the current memory area 17a is received, and it is checked whether the PI obtained from the broadcast wave matches the current PI. Is performed (step 306). If not, the current PI check similar to the home PI check is performed for all AF stations with SD on next (step 306). If all PIs do not match the current PI, the home PI is checked It is determined whether the home PI is a local network station or a high-bandwidth network station based on the code information (step 307). 9), the PI data of another network station related to the home PI is loaded (step 308), and it is checked whether there is a station that matches the home PI or the current PI (steps 309, 31).
0), when there is no station with a matching PI, and in step 3
If it is determined in step 07 that the station is a high-area network station, PI seek processing (step 311) is performed. On the other hand, step 30
When the station with the same PI matches in each of the processes 3, 305, 306, and 307, the process proceeds to the mute release operation (step 206) in FIG. 4 and the channel selection process ends.

By performing the PI check as described above, the probability that the RDS station related to the preset station can be selected can be increased.

The embodiments of the present invention have been described above.
The present invention is not limited to the embodiment described above. For example, in the search for an AF station, the PI check can be performed in order without performing the above-described rearrangement. Regarding the processing of steps 202 and 203 shown in FIG. 4, it is efficient to perform the check processing of step 203 using the time until the frequency tuning stabilizes as in the illustrated embodiment. After checking whether or not is a specific code, tuning reception processing using the home frequency may be performed.

[0039]

As is apparent from the above description, according to the present invention, the frequency data and the program identification data at the time of presetting (specific codes for non-RDS stations) are stored in the second memory.
Of the first memory area (current memory area) when the specific code is held when the specific code is held. Since data is erased once, RD
The preset tuning of the S broadcast station and the preset tuning of the non-RDS broadcast station can both be efficiently executed.

[Brief description of the drawings]

FIG. 1 is a main block diagram of a multiplex broadcast receiver showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a data storage structure of a data preset memory of the embodiment shown in FIG.

FIG. 3 is a flowchart showing a preset processing operation of the embodiment shown in FIG. 1;

FIG. 4 is a flowchart showing a preset channel selection processing operation of the embodiment shown in FIG. 1;

FIG. 5 is a flowchart showing an operation content between steps A and B in the flowchart of FIG. 4;

FIG. 6 is a diagram showing a change in data in a data memory due to a preset channel selection process of the embodiment shown in FIG. 1;
FIG. 7 is an explanatory diagram when a non-RDS station is preset, and FIG. 7B is an explanatory diagram when a RDS station is preset.

FIG. 7 is a flowchart showing a modification of the channel selection processing operation of FIG. 5;

FIG. 8 is an explanatory diagram showing a data storage structure of a data preset memory of a conventional multiplex broadcast receiver.

FIG. 9 is an explanatory diagram showing a preset channel selection operation when a non-RDS station is preset by a conventional multiplex broadcast receiver.

[Explanation of symbols]

 14 controller (preset control unit) 15 processor 16 program memory 17 data memory 17a current memory area (first storage area) 17b home memory area (second storage area)

[Table 1]

Claims (2)

(57) [Claims] 1. A preset key, a memory, and reception frequency data at the time of preset, related frequency data acquired from a received broadcast wave, and program identification data stored in a first storage area of the memory corresponding to the preset key, When the program identification data and the related frequency data are stored in the first storage area corresponding to the preset key, the reception is the frequency given by the reception frequency data or the related frequency data when the preset channel is selected and the program identification data matches. A multiplexed broadcast receiver having a broadcast station in a good state as a receiving station and a preset control unit for updating data in the first storage area, wherein the memory stores frequency data at the time of presetting corresponding to a preset key. And a second storage area for storing program identification data. When the received broadcast wave does not include the program identification data at the time of setting, the specific code is written as the program identification data in the second storage area. On the other hand, when the preset channel is selected, the data stored in the second storage area is given priority. And if the program identification code stored in the second storage area is a specific code, the first station is determined.
A multiplex broadcast receiver for erasing data stored in a storage area of the multiplex broadcast receiver. 2. The program according to claim 1, wherein the preset control section is configured to store the program identification data other than the specific code in the second storage area corresponding to the preset key selected.
It is checked whether or not the received broadcast wave that matches the reception frequency data stored in the storage area matches the program identification data stored in the second storage area. 2. The receiving station according to claim 1, wherein the reception frequency is given by the stored related frequency data and the program identification data coincides with the program identification data stored in the second storage area. Multiplex broadcast receiver.