JPH0779224B2 - Receiver - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver preferably implemented in a radio receiver having a so-called auto preset function.

Conventional technology Conventionally, in a PLL synthesizer type radio receiver,
Many tuning methods can be implemented. For example, there is a so-called preset function as an example. According to the preset function, by pre-registering the station designation information of the broadcasting station desired to be received, such as frequency, in the preset memory set corresponding to the preset key, it is only necessary to operate the preset button thereafter. Can receive.

The auto-preset function is an automatic registration of the station designation information in the preset memory. The commonly used auto-preset function sweeps a predetermined frequency band, stores the reception frequencies and field strengths of broadcasting stations above a predetermined electric field strength, and registers the reception frequencies in the preset memory in descending order of field strength. It is supposed to do.

Problems to be Solved by the Invention In the conventional auto-preset function, since only the electric field strength is compared, when the broadcast programs of the same content are broadcast from different broadcasting stations, the reception frequencies of the broadcast programs of the same content are duplicated. There is a problem that the preset memory may not be used effectively because it may be registered in the preset memory.

An object of the present invention is to provide a receiving device that can effectively use a storage unit that stores a reception frequency.

Means for Solving the Problems The present invention is directed to a broadcast program transmitted from a plurality of broadcast stations at a predetermined frequency, and identification information for identifying the contents of the broadcast program.
In a receiver with an auto-preset function that receives and demodulates PI and frequency, a predetermined frequency band is swept and a frequency fr above a predetermined electric field strength, electric field strength Vr at this time, and identification information PIr of the received broadcast program Detecting means for detecting, a storage means for storing a single identification information PIm corresponding to a plurality of preset keys, a frequency fm of the broadcasting station and an electric field strength Vm at the time of reception in association with each other, and an output of the detecting means. Storage control means for controlling writing to the storage means and rewriting of stored contents based on the above, wherein the storage control means detects that broadcasting of a broadcasting station having a predetermined electric field strength or higher is detected by the detection means. Accompanying identification information PI of the received broadcast program
means for determining whether r is stored in the storage means, and when the received broadcast program identification information PIr is not in the storage means, the storage means stores the received broadcast program in the storage means in correspondence with an empty preset key. When the identification information PIr, the reception frequency fr of the broadcasting station, and the reception electric field strength Vr are stored, and the identification information PIr of the received broadcast program is stored in the storage means, the reception electric field strength Vr and the storage means are stored in the storage means. Means for comparing the stored electric field strength Vm corresponding to the stored memory identification information PIm, and as a result of the comparison, the received electric field strength Vr is the stored electric field strength
When it is stronger than Vm, the identification information is stored in the storage means.
And a means for rewriting the frequency fm corresponding to PIm and the electric field strength Vm thereof to the reception frequency fr and the electric field strength Vr. During auto-preset, the storage means stores different identification information corresponding to each preset key. PIm, each identification information P
Corresponding to Im, the frequency of one broadcasting station with the highest electric field strength
The receiver is characterized by storing fm and its electric field strength Vm.

Operation According to the present invention, a broadcast program transmitted from a plurality of broadcast stations (hereinafter, may be abbreviated as a station) and identification information PI for identifying the content are received and demodulated, and a predetermined frequency is received. In a receiving device with an auto-preset function, which sweeps the band, registers the reception frequencies in the storage means in order from the one with the highest electric field strength, and thereafter can perform reception by operating the preset key, The frequency fr and the electric field strength above the prescribed electric field strength by the detection means during the sweep
When the determination means detects Vr and the identification information PIr and the broadcast of the broadcasting station having the predetermined electric field strength or more is detected, the identification information PIr of the received broadcast program is not stored in the storage means by the determination means. When it is determined, the identification information PIr, the reception frequency fr and the reception electric field strength Vr are stored in correspondence with the empty preset key. The stored electric field strength Vm corresponding to the same stored memory identification information PIm is compared by the comparing means, and as a result of the comparison, the contents of the storing means are rewritten only when the received electric field strength Vr is stronger than the stored electric field strength Vm. As a result, at the time of auto-preset, the storage means has different identification information PIm corresponding to each of the plurality of preset keys and the strongest electric field strength 1 corresponding to each identification information PIm. Frequency fm of the broadcasting stations and store the field strength Vm.

Example In a radio data system (abbreviated as RDS) broadcasting service that has recently been started in West Germany and the United Kingdom, a PI indicating a program content is multiplexed with a signal of a normal broadcasting program.
A code signal such as a code is being sent. This PI code is an identification code for identifying the type of program,
For example, in the case of a program that broadcasts jazz of music, the same PI code is transmitted to different broadcasting stations. The radio receiver 20 described in this embodiment can receive the RDS broadcast.

FIG. 1 is a block diagram showing an electrical configuration of a radio receiver 20 which is an embodiment of the present invention. Radio receiver 20
It is possible to receive each signal in each frequency band of an FM (frequency modulation) signal and an AM (amplitude modulation) signal transmitted from a plurality of transmitting stations, that is, a broadcasting station. First, the configuration for receiving the FM signal will be described.

The FM reception signal received by the antenna 1 is given to the FM high frequency amplifier circuit 2. Received by the FM high frequency amplifier circuit 2
The FM reception signal is tuned / amplified and input to the FM mixing circuit 3. An FM local oscillation circuit 4 is provided in association with the FM mixing circuit 3, and the FM reception signal is converted into an intermediate frequency signal in the FM mixing circuit 3, and the intermediate frequency signal is fed to an FM intermediate frequency amplifier circuit 5. It is given to the FM detection circuit 6 via and is converted into an acoustic signal. The acoustic signal from the FM detection circuit 6 is amplified by the low frequency amplification circuit 7 and is sonicated by the speaker 8.

The oscillation signal from the FM local oscillation circuit 4 is also given to a PLL (phase-locked loop) partial circuit 16 of the processing device 10 realized by a microcomputer or the like. PLL
The partial circuit 16 includes a prescaler 21, a programmable divider 22, and a phase comparator 23. PLL
The oscillation signal from the FM local oscillation circuit 4 input to the partial circuit 16 is fed to the prescaler 21 at a constant frequency division ratio, for example,
It is divided by 10 and given to the programmable divider 22. The programmable divider 22 has a frequency division ratio N corresponding to a control signal from a control unit 24 in the processing device 10, for example.
The signal from the prescaler 21 is divided by and is given to the phase comparator 23.

The phase comparator 23 compares the phase of the output of the programmable divider 22 with the phase of a reference signal having a preset frequency, and outputs it to the loop filter 11. Loop filter
Reference numeral 11 waves the signal from the phase comparator 23, generates a control voltage according to the signal from the phase comparator 23, and outputs the tuning frequency of the FM high frequency amplification circuit 2 and the oscillation frequency of the FM local oscillation circuit 4. Control. Thus, the FM local oscillation circuit 4, the loop filter 11 and the PLL partial circuit 16 constitute a so-called PLL circuit.

In this PLL circuit, based on the value of the control signal derived from the control unit 24 (hereinafter referred to as “N value”), the FM is controlled by the prescaler 21 and the programmable divider 22.
The oscillation signal from the local oscillator circuit 4 is divided by a division ratio of 10 × N and given to the phase comparator 23. The reference frequency of the preset reference signal is, for example, 10 kHz, and this reference signal and the divided frequency from the programmable divider 22 are divided.
The loop filter 11 controls the FM high frequency amplification circuit 2 and the FM local oscillation circuit 4 so that the frequency matches the frequency of the FM local oscillation signal, and in this way, the frequency corresponding to the N value from the control unit 24. FM reception operation can be performed with.

As described above, the determination as to whether or not the receiving operation at the receiving frequency set by the control unit 24 is being performed is determined by the station detection signal provided from the FM detection circuit 6 to the control unit 24 via the line l1, and This can be performed by the electric field strength given from the FM detection circuit 6 through the line 12. The electric field strength is converted to a digital value by the analog / digital converter 27 and then given to the control unit 24. Further, the output signal from the FM detection circuit 6 is also given to the RDS demodulation circuit 9 which is the identification information detection means, and the RDS demodulation circuit 9 uses the identification information for identifying the content of the broadcast program from the RDS (radio data system) signal. A certain PI (Program Identification) code is demodulated. The demodulated RDS signal is given to the control unit 24 via the line l3.

In the auto preset operation described later, when the control unit 24 detects the reception frequency of the receivable broadcasting station by the electric field strength and the station detection signal, the reception frequency, the electric field strength and the RDS signal at the time of detection are stored in the storage unit 26. Remembered. The key input unit 25 is provided with, for example, preset keys and auto preset function keys.

The radio receiver 20 can also receive the AM signal as described above. The AM reception signal received by the antenna 1 is given to the AM high frequency amplifier circuit 17. In the AM high frequency amplifier circuit 17, the AM received signal is tuned / amplified. An AM local oscillator circuit 13 is provided in association with the AM high frequency amplifier circuit 17,
The received signal is converted into an intermediate frequency signal in the AM mixing circuit 12, and this intermediate frequency signal is passed through the AM intermediate frequency amplifier circuit 14.
It is given to the AM detection circuit 15 and converted into an acoustic signal. The acoustic signal from the AM detection circuit 15 is amplified by the low frequency amplification circuit 7 and sonicated by the speaker 8.

Further, the AM local oscillation circuit 13 constitutes a PLL circuit by the PLL partial circuit 16 and the loop filter 11. The PLL circuit controls the tuning frequency of the AM high frequency amplifier circuit 17 and the oscillation frequency of the AM local oscillation circuit 13. In addition, the judgment as to whether or not the AM reception operation is being performed at the reception frequency is
This can be performed based on the electric field strength and the station detection signal input from the AM detection circuit 15 to the control unit 24.

FIG. 2 is a flow chart for explaining the auto preset operation in the radio receiver 20. In the present embodiment, it is assumed that up to 5 pieces of frequency information can be stored. When the auto preset function key of the key input unit 25 is operated in step a1, sweeping of a predetermined frequency band is started, and in step a2, the FM detection circuit 6
The control unit 24 reads the station detection signal given from the control unit 24 and judges whether or not the station is detected.

When a station is detected, the process proceeds to step a3, the electric field strength of the detected reception frequency fr of the station is converted into a digital value by the analog / digital converter 27, the electric field strength Vr is read, and in step a4, the RDS demodulation circuit is used. R demodulated by 9
Read the PI code PIr of the DS signal. The PI code is a program identification code, and it is possible to determine whether or not the broadcast programs have the same content by comparing the PI codes.

In step a5, it is determined whether or not there is a station already stored in the storage means 26, that is, the reception frequency fm. If there is no reception frequency fm stored, step a1
If there is a stored reception frequency fm in step 1, then go to step a6. In step a6, the detected station PI
Code PIr and PI of frequency fm stored in the storage means 26
The codes PIm are compared with each other to determine whether they have the same PI code, that is, whether the programs have the same contents.

If there is the same PI code, that is, if the frequency of the station broadcasting the program of the same content is already stored, the process proceeds to step a8, and the electric field strength Vr of the detected station and the storage means 26 are stored.
The electric field strength Vm of the reception frequency fm having the same PI code as that of the detected station stored in the above is compared. If the electric field strength Vr of the detected station is stronger (Vm <Vr), the process proceeds to step a9, the data regarding the reception frequency fm stored in the storage means 26 is erased, and the reception frequency fr of the station detected in step a10 is deleted. , Electric field strength Vr, and PI code PIr storage means 2
Write in 6 and proceed to step a12.

In step a8, the stored electric field strength Vm of the reception frequency fm is stronger than the detected electric field strength Vr of the station (Vm ≧ V
In the case of r), the data is not rewritten and the process proceeds to step a12.

In step a6, when the detected PI code PIr of the station is different from the PI code PIm of the reception frequency fm stored in the storage means 26, that is, when the frequency of the station broadcasting the same program is not stored. Proceeds to step a7, 5
It is determined whether the reception frequency information for the station is stored. If the reception frequency information for five stations has not been written, proceed to step a11, and the reception frequency fr of the detected station,
Writing the electric field strength Vr and the PI code PIr in the storage means 26,
Go to step a12. If the reception frequency information for five stations has already been written, the process proceeds to step a8, and the electric field strength Vr of the reception frequency fr of the detected station and the reception frequencies fm of the five stations already stored in the storage means 26 are stored. The electric field strength Vm of the station is compared with the electric field strength Vm of the station, and it is determined whether or not there is an electric field strength weaker than the electric field strength Vr of the detected station.

If there is no weak electric field strength (Vm ≧ Vr), that is, if the received electric field strength Vr is equal to or lower than the electric field strength Vm of all the stations already stored, the data is not rewritten and the process proceeds to step a12. , Some have weak electric field strength (Vm <V
If r), that is, if the received electric field strength Vr exceeds the electric field strength Vm of at least one station stored in the storage means, the process proceeds to step a9. In step a9,
Data relating to the reception frequency fm, which is an electric field strength weaker than the detected electric field strength Vr of the station, is deleted from the storage means 26, and the reception frequency fr and electric field strength V of the station detected in step a10.
r and the PI code PIr are written in the storage means 26, and step a1
Go to 2.

In step a12, the next frequency is set in the control means 24, whether or not the auto preset function is completed in step a13, for example, whether or not the sweep of a predetermined frequency band is completed, or a stop key for stopping the auto preset operation. If it is not possible to finish, it returns to step a2 and repeats the auto preset operation. If it is finished, the auto preset operation is finished.

As described above, according to the present embodiment, when the reception frequency information, that is, the reception frequency fm, the electric field strength Vm, and the PI code PIm are stored in the storage unit 26 by the auto preset function, the stations having the same PI code, that is, It is possible to prevent the frequency information of the broadcasting stations broadcasting the same broadcast program from being redundantly stored, and it is possible to effectively use the storage means 26. This eliminates the need to manually delete the redundantly stored frequency information, thereby significantly improving the operability and convenience of the radio receiver 20.

Although the present embodiment has been described with reference to FM broadcasting in which RDS signals are multiplexed, it may be carried out in association with other broadcasting, such as television broadcasting, as long as it is a broadcasting in which code signals similar to RDS signals are multiplexed. it can.

EFFECTS OF THE INVENTION According to the present invention, among broadcast stations having the same identification information PIr, a station having the maximum received electric field strength Vr is stored, and therefore, a broadcast station that broadcasts a broadcast program having the same content is stored. The storage means is prevented from being stored, so that the storage means of the receiving device can be effectively used. Moreover, it is possible to receive the broadcast of the station having the maximum reception electric field strength Vm of each identification information PIm based on the stored contents.

Particularly according to the present invention, the storage control means determines whether or not the identification information PIr of the broadcasting station having a predetermined electric field strength or more is stored in the storage means by the determination means. Corresponding to the identification information PIr,
When the reception frequency fr and the reception electric field strength Vr are stored and stored in the storage means, the storage electric field strength Vm corresponding to the same storage identification information PIm is compared by the comparison means, and the reception electric field strength Vr is higher than the storage electric field strength Vm. Since the contents of the storage means are rewritten only when the storage means is strong, there is no need for any other storage means other than the storage means, and the excellent effect that the configuration can be simplified is also obtained. Is achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an electrical configuration of a radio receiver 20 which is an embodiment of the present invention, and FIG. 2 is a flow chart for explaining an auto preset operation in the radio receiver 20. Is. 6 ... FM detection circuit, 9 ... RDS demodulation circuit, 20 ... radio receiver, 24 ... control unit, 26 ... storage means, fm, fr ... frequency, PIm, PIr ... PI code, Vm, Vr …… electric field strength

Claims (1)

[Claims] 1. A receiving device with an auto-preset function for receiving and demodulating a broadcast program sent from a plurality of broadcast stations at a predetermined frequency and identification information PI for identifying the contents of the broadcast program. Sweeping the specified frequency band and detecting the frequency fr above a predetermined electric field strength, the electric field strength Vr at this time, and the identification information PIr of the received broadcast program, and a single detection unit for each preset key. Of the identification information PIm, the frequency fm of the broadcasting station, and the electric field strength Vm at the time of reception are stored in association with each other, and storage for controlling writing to the storage means and rewriting of the stored content based on the output of the detection means. The storage control means is provided with identification information PI of the received broadcast program when the detection means detects a broadcast of a broadcasting station having a predetermined electric field strength or more.
means for determining whether r is stored in the storage means, and when the received broadcast program identification information PIr is not in the storage means, the storage means stores the received broadcast program in the storage means in correspondence with an empty preset key. When the identification information PIr, the reception frequency fr of the broadcasting station, and the reception electric field strength Vr are stored, and the identification information PIr of the received broadcast program is stored in the storage means, the reception electric field strength Vr and the storage means are stored in the storage means. Means for comparing the stored electric field strength Vm corresponding to the stored memory identification information PIm, and as a result of the comparison, the received electric field strength Vr is the stored electric field strength
When it is stronger than Vm, the identification information is stored in the storage means.
And a means for rewriting the frequency fm corresponding to PIm and the electric field strength Vm thereof to the reception frequency fr and the electric field strength Vr. During auto-preset, the storage means stores different identification information corresponding to each preset key. PIm, each identification information P
Corresponding to Im, the frequency of one broadcasting station with the highest electric field strength
A receiving device characterized by storing fm and its electric field strength Vm.