JP2590476Y2 - Radio receiver - Google Patents

Description

[Detailed description of the invention]

[0001]

This invention has two sets of tuners.
The present invention relates to a radio receiver having an auto memory function and also receiving data of a radio data system (hereinafter, radio data system is referred to as RDS).

[0002]

2. Description of the Related Art RDS is a system described in the European Broadcasting Union Technical Specification (EBU document 3244), which allows a listener to easily search for a desired radio program. Among the functions of this system is a function to notify the radio receiver that the frequency is assigned to another broadcasting station that is broadcasting the same program as the program currently being received. , It is possible to switch the radio receiver to that reception. Therefore, the radio receiver receives the RDS data, stores the frequency information of the alternative broadcast station, and searches the list of the stored frequency information.

On the other hand, a radio receiver having an auto memory function clears a preset frequency stored in a storage device when an auto memory instruction is given, and stores a frequency of a broadcast station which can be received in the band. It is configured to store in the device.

[0004]

However, since the memory operation is performed by one tuner in the twin tuner, there is a problem that it takes a very long time to perform the memory while searching. Also, when the broadcast station is stored, the broadcast station is searched, and when it is found that the broadcast station exists, the PI code is checked at the time of storage, and the PS code (station name code) is also prepared. There is a problem that it takes much time for the memory because the memory does not proceed temporarily during this time, so that more time is required.

[0005] It is an object of the present invention to provide a radio receiver in which the time required for an auto memory is greatly reduced.

[0006]

The radio receiver according to the present invention has two sets of tuners, has an auto memory function, and receives an auto memory instruction in the radio receiver for receiving data from the radio data system. , The receivable broadcasting stations are alternately and independently searched in different directions or in the same direction until the PI code and the PS code are determined, and the frequency information of the searched receivable broadcasting stations and the PI code and PS
A receivable frequency information storage control means for storing a code in a storage means, and when the frequency information of the receivable broadcast station searched by both tuners is the same when the frequency information of the receivable broadcast station is stored, the search is performed by one tuner. A selective storage control means for storing only frequency information of a receivable broadcast station and a PI code and a PS code for the receivable broadcast station is provided.

[0007]

According to the radio receiver of the present invention, the receivable broadcasting stations are alternately and independently searched in different directions or in the same direction until the PI code and the PS code are determined when the auto memory instruction is given. , Frequency information of the searched receivable broadcast station and P
When storing the I code and the PS code, when the frequency information of the receivable broadcasting station searched by both tuners is the same, the frequency information of the receivable broadcasting station searched by one tuner, the PI code for the receivable broadcasting station, and Only the PS code is stored.

[0008] Accordingly, since the receivable broadcasting station is searched in the same direction or in the opposite direction by the two tuners, even if it takes time to determine the P code and the PS code, the two tuners use the two tuners in the same or opposite direction. Since the search for the receivable broadcast station is performed in the direction, the time required for the search is reduced to half of the conventional one, and when the frequency information of the receivable broadcast station searched by both tuners is the same, the search is performed by one tuner. Since only the frequency information of the receivable broadcasting station and the PI code and the PS code for the receivable broadcasting station are stored, the same information is not stored even if the search is performed by both tuners. Therefore, the storage capacity required in the storage device does not increase.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

The radio receiver according to the present embodiment has a front end 2 for selectively amplifying a reception signal from an antenna 1, converting the signal into an intermediate frequency, and outputting the intermediate frequency. A frequency synthesizer 3 having a PLL structure acting as a local oscillator for converting a signal into an intermediate frequency signal, an intermediate frequency amplifying circuit 4 for amplifying an intermediate frequency signal output from the front end 2, and a demodulation of the output of the intermediate frequency amplifying circuit 4 The tuner A includes a demodulation circuit 5 that performs the demodulation.

A tuner B having the same configuration as the tuner A, comprising a front end 7, a frequency synthesizer 8, an intermediate frequency amplifying circuit 9 and a demodulating circuit 10 for receiving a received signal from the antenna 6, and demodulating circuits 5 and 10
And a composite signal switching circuit 11 for selecting and outputting one of the outputs.

Further, the radio receiver of this embodiment receives the output from the composite signal switching circuit 11 and performs stereo demodulation. The stereo demodulation circuit 12 amplifies the stereo demodulated output and drives the left and right speakers 14 separately. The radio receiver according to the present embodiment includes the frequency amplification circuit 13, and the composite signal from the tuner A or the tuner B selected by the composite signal switching circuit 11 is stereo-demodulated and amplified to perform a receiving operation.

Further, the tuner A has an electric field intensity detecting circuit 17 for detecting an electric field intensity based on an output from an intermediate stage of the intermediate frequency amplifier circuit 4, and a noise level for detecting a noise level based on an output of the demodulating circuit 5. RDS for demodulating RDS data from outputs of detection circuit 18 and demodulation circuit 5
The tuner B includes a demodulation circuit 19, and the tuner B has an electric field strength detection circuit 21 and a noise level detection circuit 22 similarly to the tuner A.
And an RDS demodulation circuit 23.

Therefore, the radio receiver of the present embodiment
The electric field strength is determined by the electric field strength detection circuits 17 and 21.
Noise levels are detected by noise level detection circuits 18 and 22, respectively, and RDS demodulation circuits 19 and 2
3 demodulates the RDS data.

Further, the radio receiver according to the present embodiment has an automatic memory instruction switch 16 for issuing an automatic memory instruction.
And a RAM for storing frequency information of a receivable broadcast station, a PI code and a PS code for the receivable broadcast station, and the like.
24, and a microcomputer 25 which cooperates with the RAM 24 to act as a control device.

The microcomputer 25 controls the tuner A based on the detected electric field strength from the electric field strength detection circuit 17 and the detected noise level from the noise level detection circuit 18.
The reception state of the tuner B is determined based on the detected electric field strength from the electric field strength detection circuit 21 and the noise level detected from the noise level detection circuit 22,
The switching of the composite signal switching circuit 11 is controlled so as to select the output from the tuner having the better reception state based on these determination results.

Further, the microcomputer 25 controls the tuner A and the tuner B when the auto memory instruction is given.
Search for receivable broadcasting stations in different directions or in the same direction alternately and independently until a PI code and a PS code are determined, frequency information of the searched receivable broadcasting stations, PI code for the receivable broadcasting station And the PS code are stored in a predetermined storage area of the RAM 24. When the same frequency information is detected by both tuners in this storage, control for storing only the frequency information of the receivable broadcasting station searched by one tuner in the storage area is performed. Do.

Here, the microcomputer 25 functions functionally as a receiving state determining means 26 for determining the receiving state of each tuner. A receivable frequency information storage for searching independently and alternately until a code and a PS code are determined, and storing frequency information of the searched receivable broadcast station and a PI code and a PS code for the receivable broadcast station in storage means. Control means 27
When storing the frequency information of the receivable alternative broadcast station, when the frequency information of the receivable broadcast station searched by both tuners is the same, the frequency information of the receivable broadcast station searched by one tuner and the At least a selective storage control means 28 for storing only the PI code and the PS code.

The operation of the radio receiver according to the present embodiment having the above-described configuration will be described with reference to the flowcharts shown in FIGS.

When the automatic memory is instructed by the automatic memory instruction switch 16, the frequency currently being received is set in the tuners A and B and the same frequency is received (step S1). This is done by setting the same frequency division ratio data corresponding to the frequency currently being received in the frequency synthesizers 3 and 8. When searching for an alternative station, that is, during an AF search, the search operation is stopped.

After step S1, the reception state of tuner A at the set reception frequency is checked (step S5). The reception state check is performed by the reception state determination means 26.
Is checked by the electric field strength and the noise level. If the electric field strength is equal to or more than a predetermined value and the noise level is less than the predetermined value, it is determined that the reception state is good.
If it is determined in step S5 that the reception condition is good, the counting by the PI code check timer for setting the PI code check period is started (step S5).
6).

After step S6, a check is made to determine whether all bits constituting the PI code are complete (step S7). When all bits are complete, that is, when it is determined that the PI code is determined, Next, it is checked whether or not the storage area for storing the reception frequency information, that is, the frequency division ratio data, remains in the RAM 24 and the same P
It is checked that the I code has not been stored (step S8). If it is determined that the storage area for storing the frequency division ratio data by the auto memory still remains and the same PI code is not stored, the PI code check timer is cleared and the PS for setting the PS code check period is set. Time measurement by the code check timer is started (step S9).

After step S9, the process waits until all the bits of the PS code are completed (step S10). When all the bits are completed, that is, when it is determined that the PS code is determined, the frequency division corresponding to the reception frequency is performed. The ratio data, the PI code, and the PS code are stored correspondingly in the free storage area of the RAM 24, and the PS code check timer is cleared (step S11). Therefore, only when it is determined that the same PI code has not been recorded, the PI code is stored in step S8. If the same PI code has already been recorded, the recording operation in step S11 is not performed.

Subsequent to step S11, it is checked whether the time counted by the PI code check timer or the PS code check timer has exceeded a set time (step S12). If it is determined in step S5 that the reception state of the tuner A is not good, then, if it is determined in step S7 that all bits constituting the PI code have not been input, step S5 is followed.
7, if it is determined in step S8 that there is no remaining storage area for the auto memory, the process proceeds to step S8, or if it is determined that the same PI code is already stored, the process proceeds to step S8. Following step S10, or when it is determined that all the bits constituting the PS code have not been input, step S10 is followed by step S10.
12 is executed.

Here, when all the bits constituting the PI code are not prepared in step S7, the search for the frequency information of the receivable broadcasting station is performed by another tuner. When it is determined that all the codes constituting the PS code have not been input, the search of the frequency information of the receivable broadcasting station is performed by another tuner under the control of the receivable frequency information storage control means 27, and the PI code is determined. Same P
When the I code is not stored, the frequency information of the receivable broadcasting station, the PI code and PS for the frequency information
The code will be stored.

If it is determined in step S12 that the count of the PI code check timer or the PS code check timer has exceeded the set time, the frequency division ratio data for setting the reception frequency of the tuner B is changed to the next lower reception frequency. , That is, if the frequency division ratio data is reduced by one step, it is checked whether the reception frequency of tuner B is the same as the reception frequency of tuner A (step S1).
3).

Here, when the PI code is determined late, P
The I code check timer overflows. This is a case where the reception state is not good and it takes time to determine the PI code. In this case, the reception frequency is changed. The same applies to the case of the PS code. Step S
When it is determined in step 13 that the reception frequencies are not the same, the frequency division ratio data for setting the reception frequency of the tuner B is reduced by one step (step S14).

When it is determined in step S12 that the PI code check timer and the PS code check timer have not overflown, or in step S14
Is executed, the steps S5 to S11 are performed.
Are performed (steps S15 to S21).

If it is determined in step S15 that the reception state of the tuner B is not good, following step S15, if it is determined in step S17 that all bits constituting the PI code are not input, step S1 is performed.
After step 7, if it is determined in step S18 that there is no remaining area for auto memory, step S18 is executed.
Following step S18, or when it is determined in step S18 that the same PI code has already been stored, step S18 is followed by step S20 when it is determined that all bits constituting the PS code are not input in step S20. Subsequent to S20, it is checked whether the auto memory operation is completed (step S22).

As a result of the check in step S22, when the end of the auto memory is instructed, when the data is stored in all the storage areas, when the search for all the frequencies in one band is completed, the auto memory operation is terminated. , The auto memory operation is terminated. The auto memory operation is also terminated when it is determined in step S13 that the reception frequencies are the same.

If it is determined in step S22 that the end of the auto memory has not been instructed, it is checked whether the time counted by the PI code check timer or the PS code check timer has exceeded the set time (step S2). . If it is determined in step S2 that the counts of the PI code check timer and the PS code check timer have not exceeded the set time, step S5 is executed following step S2.

If it is determined in step S2 that the count of the PI code check timer or the PS code check timer has exceeded the set time, the frequency division ratio data for setting the reception frequency of the tuner A has been increased by one step. Then, it is checked whether or not the reception frequency is the same as the reception frequency of tuner B (step S3). If it is determined that the reception frequency is not the same, the frequency division ratio data for setting the reception frequency of tuner A is increased by one step. Then, step S5 is executed (step S5).
4). The auto memory operation is also terminated when it is determined in step S3 that the reception frequencies are the same.

As described above, when the frequency division ratio data of tuner A and the frequency division ratio data of tuner B are equal when the frequency division ratio data is increased by one step in steps S3 and S13, the selection and storage control means 28 By operation, the one searched earlier is remembered, and the one searched later is not recorded.

In the above embodiment, the tuner A
Although the case has been exemplified where the tuner A and the tuner B independently search for receivable frequency information in different directions, the tuner A and the tuner B may search for receivable frequency information independently of each other in the same direction.

[0035]

As described above, according to the radio receiver of the present invention, when the auto memory instruction is given, the receivable broadcasting stations can be set to the PI code and the PS code in different directions or in the same direction by the two tuners. Are independently and alternately searched until the search is completed, and the frequency information of the searched receivable broadcast station and the PI code and PS code for the receivable broadcast station are stored in the storage means. Even if it takes a long time to determine, the time required for the search can be reduced to half of that of the related art.

Further, when the frequency information of the receivable broadcasting station searched by both tuners is the same, only the frequency information of the receivable broadcasting station searched by one tuner and the PI code and the PS code for the receivable broadcasting station are stored. Thus, the same information is not stored even when searching is performed by two tuners, and the storage capacity required in the storage device does not increase.

[Brief description of the drawings]

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

FIG. 2 is a flowchart for explaining the operation of the embodiment of the present invention;

FIG. 3 is a flowchart illustrating the operation of the embodiment of the present invention;

[Explanation of symbols]

 A and B tuners 11 Composite signal switching circuit 16 Auto memory instruction switch 17 and 21 Electric field strength detection circuit 18 and 22 Noise level detection circuit 19 and 23 RDS demodulation circuit 24 RAM 25 Microcomputer 26 Reception state discriminating means 27 Receivable frequency information storage Control means 28 Selection storage means

Claims (1)

(57) [Scope of request for utility model registration] 1. A radio receiver having two sets of tuners, having an auto memory function, and receiving data from a radio data system. Alternatively, the search is performed alternately and independently in the same direction until the PI code and the PS code are determined, and the frequency information of the searched receivable broadcast station and the PI code and the PS code for the receivable broadcast station are stored in the storage means. Receivable frequency information storage control means, when storing the frequency information of the receivable broadcast station, when the frequency information of the receivable broadcast station searched by both tuners is the same, the frequency information of the receivable broadcast station searched by one tuner and A selective storage control means for storing only the PI code and the PS code for the receivable broadcasting station A radio receiver comprising: a step;