JPH02260913A - Reception device - Google Patents

Abstract

PURPOSE:To prevent the reception frequency of a broadcasting station which broadcasts the broadcasting program of the same content from being stored in a storage means by selectively storing a single originating frequency in the storage means at every identification information based on the strength of an electric field. CONSTITUTION:When the station is detected, an analog/digital converter 27 converts the strength of the electric field in the reception frequency fr in the detected station into a digital value, reads the strength of the electric field Vr and reads the PI code PIr of an RDS signal which an RDS demodulation circuit 9 has demodulated. It is discriminated whether the broadcasting programs have the same content by comparing the PI codes. Thus, frequency information of the station having the same PI code is prevented from being doubly stored at the time of storing the reception frequency fm, the strength of the electric field Vm and the PI code PIm in the storage means 26, and the storage means 26 can effectively be used.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a receiving device suitably implemented in a radio receiver or the like having a so-called auto-preset function.

BACKGROUND OF THE INVENTION Conventionally, PLL synthesizer type radio receivers can implement a number of tuning methods. For example - as an example,
One example is a so-called preset function. According to the preset function, by registering the station designation information of the broadcasting station you wish to receive, such as the frequency, in advance in the preset memory that is set according to the preset key, from now on, you can simply operate the preset button. Can receive data.

The auto preset function automates the registration of station designation information in the preset memory.

The auto preset function used in -a extracts a predetermined frequency band, memorizes the received frequencies and electric field strengths of broadcasting stations with a predetermined field strength or higher, and presets the received frequencies in order of strength of the electric field. It is now registered in memory.

Problems to be Solved by the Invention Conventional auto preset machines only compare electric field strengths, so when broadcast programs with the same content are broadcast from different broadcast stations, the reception frequency of the broadcast programs with the same content There was a problem in that the preset memory was not used effectively because there were cases where the data was registered in the preset memory redundantly.

An object of the present invention is to provide a receiving device that can effectively use a storage means for storing reception frequencies.

Means for Solving the Problems The present invention provides a receiving device that receives and demodulates broadcast programs sent at predetermined frequencies from a plurality of broadcast stations and identification information that identifies the content of the broadcast programs. Frequency detection means for detecting the reception frequency of a broadcast station; identification information detection means for detecting identification information of a received broadcast program; field strength detection means for detecting electric field strength at the time of reception; 1. A receiving device comprising: a storage means for storing an electric field strength at a time; and a control means for selecting a single receiving frequency for each identification information based on the electric field strength and storing it in the storage means.

According to the present invention, in a receiving device that receives and demodulates broadcast programs transmitted from a plurality of broadcast stations and identification information for identifying their contents, the frequency detection means detects the received frequency of the received broadcast station. The identification information detection means detects the identification information of the broadcast program of the received broadcast station, and the electric field strength detection means detects the electric field strength at the time of reception.

When the same identification information is detected, the control means selects the broadcasting frequency with the stronger electric field strength based on the electric field strength, and stores the receiving frequency, the identification information, and the electric field strength at the time of reception in the storage means. Therefore, if there is a broadcast station that transmits the same broadcast program on different frequencies, and it is detected that the program information is the same based on the identification information, only the information related to the receiving frequency where the electric field strength is strong at the time of reception is transmitted. It can be stored in a storage means.

Example: Radio data system (abbreviated as RDS) services have recently been launched in West Germany, the United Kingdom, and other countries.In broadcasting, code signals such as PI codes that represent the program content are multiplexed with the signals of regular broadcast programs and are sent out. Yes, this P
The I code is an identification code for identifying the type of program; for example, if it is a program that broadcasts jazz music,
The same PI code is transmitted even if the broadcasting stations are different.

The radio receiver 20 described in this embodiment has the above-mentioned R
Can receive DS broadcasts.

FIG. 1 is a block diagram showing the electrical configuration of a radio receiver 20 that is an embodiment of the present invention. radio receiver 20
is an FM signal transmitted from multiple transmitting stations, i.e., broadcasting stations.
(Frequency modulation) signal and AM (amplitude modulation) signal in each frequency band can be received. First,
A configuration for receiving FM signals will be explained.

The FM reception signal received by the antenna 1 is given to the FM high frequency amplification circuit 2. In the FM high frequency amplification circuit 2, the received FM reception signal is amplified and input to the FM mixing circuit 3. An FM local oscillation circuit 4 is provided in connection with the FM mixing circuit 3, and the FM received signal is converted into an intermediate frequency signal in the FM mixing circuit 3. via FM
The signal is applied to the detection circuit 6 and converted into an acoustic signal. The acoustic signal from the FM detection circuit 6 is amplified by a low frequency amplification circuit 7 and converted into sound by a speaker 8.

The oscillation signal from the FM local oscillation circuit 4 is also transmitted to the PL of a processing device 10 realized by a microcomputer or the like.
L (phase-locked loop) is applied to the partial circuit 16. The PLL subcircuit 16 includes a prescaler 21, a programmable divider 22, and a phase comparator 23.

The oscillation signal from the FM local oscillation circuit 4 input to the PLL subcircuit 16 is divided by a constant frequency division ratio, for example 1o, in the prescaler 21 and is applied to the programmable divider 22 . This programmable divider 2
2 divides the signal from the prescaler 21 by a frequency division ratio N corresponding to the control signal from the control unit 24 in the processing device 10, and supplies the divided signal to the phase comparator 23.

The phase comparator 23 compares the phase between the output of the programmable divider 22 and a reference signal having a preset frequency, and outputs the result to the loop filter 11 . The loop filter 11 converts the signal from the phase comparator 23 into an f wave, generates a control tn voltage according to the signal from the phase comparator 23, and adjusts the tuning frequency of the FM high frequency amplifier circuit 2 and the FM local oscillation circuit 4. The oscillation frequency is controlled. In this way, the FM local oscillation circuit 4, the loop filter 11 and the PLL partial circuit 1
6 constitutes a so-called PLL circuit.

In this PLL circuit, the oscillation signal from the FM local oscillation circuit 4 is adjusted by the prescaler 21 and the programmable divider 22 to 10× The frequency is divided by a frequency division ratio of N and provided to the phase comparator 23. The reference frequency of the preset reference signal is, for example, 10k.
Hz, and the loop filter 11 controls the PM high frequency amplifier circuit 2 and the FM local oscillation circuit 4 so that the frequency of this reference signal and the frequency-divided FM local oscillation signal from the programmable divider 22 match. However, in this way, the FM reception operation can be performed at the frequency corresponding to the N value of the control section 24.

As described above, it is determined whether or not the reception operation is being performed at the reception frequency set by the control unit 24 based on the FM
The station detection signal from the detection circuit 6 is given to the control unit 24 via the line 11, and from the FM detection circuit 6 to the line 12.
This can be done by applying an electric field strength through the . The electric field strength is converted into a digital value by the analog/digital converter 27 and then provided to the control unit 24 .

The output signal from the FM detection circuit 6 is also given to an RDS demodulation circuit 9, which is an identification information detection means. A certain P I (Pr
The demodulated RDS signal is sent to line 13.
The signal is given to the control unit 24 via.

During the auto preset operation described later, when the control unit 24 detects the reception frequency of a receivable broadcasting station based on the electric field strength and station detection signal, the reception frequency, electric field strength, and RDS signal at the time of detection are stored in the storage means 26. be remembered. The key manual section 25 is provided with, for example, a preset key and an auto preset function key.

Furthermore, the radio receiver 20 is also capable of receiving AM signals as described above. The AM reception signal received by the antenna 1 is applied to the AM high frequency amplification circuit 17. In the AM high frequency amplifier circuit 17, the AM received signal is tuned/amplified. An AM local oscillation circuit 13 is provided in association with the AM high frequency amplification circuit 17, and the AM received signal is converted into an intermediate frequency signal in the AM mixing circuit 12, and this intermediate frequency signal is transmitted via the AM intermediate frequency amplification circuit 14. AM detection circuit 1
5 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 turned into sound by the speaker 8.

Further, the AM local oscillation circuit 13 includes a PLL partial circuit 16 and a loop filter 11 to form a PLL circuit. This PLL circuit controls the tuning frequency of the AM high frequency amplification circuit 117 and the oscillation frequency of the AM local oscillation circuit 13. Furthermore, it can be determined whether or not an AM reception operation is being performed at the reception frequency based on the electric field strength and station detection signal input from the AM detection circuit 15 to the control unit 24.

FIG. 2 is a flowchart for explaining the auto-preset operation in the radio receiver 2o. In this embodiment, it is assumed that up to five pieces of frequency information can be stored. In step 2tl, when the auto preset function key of the key manual section 25 is operated, sweeping of a predetermined frequency band is started, and in step a2,
The station detection signal given from the FM detection circuit 6 is transmitted to the control unit 24.
It is determined whether the station is detected or not.

When a station is detected, the process proceeds to step a3, where the analog/digital converter 27 converts the electric field strength of the received frequency fr of the detected station into a digital value, and reads the electric field strength Vr.In step a4, the RDS demodulation circuit The PI code PIr of the RDS signal demodulated by 9 is read.

The PI code is a program identification code, and by comparing the PI codes, it can be determined whether the broadcast programs have the same content.

In step a5, it is determined whether there is a station already stored in the storage means 26, that is, there is a receiving frequency fm, and if there is no stored receiving frequency fm, the process proceeds to step all, and the stored receiving frequency If there is fm, proceed to step a6. In step a6,
The P-code PIr of the detected station is compared with the PI code PIm of the frequency fm stored in the storage means 26, and it is determined whether the same PI code exists, that is, whether the programs have the same content.

If there is the same PI code, that is, if the frequency of a station broadcasting a program with the same content has already been stored, the process proceeds to step a8, and the electric field strength vr of the detected station and the frequency of the station that broadcasts the program with the same content are stored in the storage means 26. The electric field strength Vm of the reception frequency fm having the same PI code as the detected station is compared. If the electric field strength Vr of the detected station is stronger, the process proceeds to step a9, and the received frequency f stored in the storage means 26 is
m, and the reception frequency fr, electric field strength Vr, and PI of the station detected in step alO are erased.
Write the code PIr into the storage means 26, step a12
Proceed to.

In step a8, if the electric field strength Vm of the stored receiving frequency fm is stronger than the electric field strength Vr of the detected station, the process proceeds to step a12 without rewriting the data.

In step a6, the PI code PIr of the detected station is
and P of the receiving and transmitting station wave number fm stored in the storage means 26.
If the I code P1m is different, that is, if the frequencies of stations broadcasting programs with the same content are not stored, the process proceeds to step a7, and it is determined whether reception frequency information for five stations is stored. If the reception frequency information for five stations has not been written, the process proceeds to step all, where the reception frequency fr, electric field strength Vr and PI code PIr of the detected station are written in the storage means 26, and the process proceeds to step a12. If receiving frequency information for five stations has already been written, proceed to step a8, and write the receiving frequency frL of the detected station.
y') Compare the electric field strength Vr with the electric field strength Vm of the reception frequency fm for the five stations already stored in the storage means 26, and check whether there is any electric field strength weaker than the electric field strength Vr of the detected station. It will be decided whether

If there is no weak electric field strength, the process proceeds to step a12 without rewriting the data, and if there is a weak electric field strength, the process proceeds to step a9.

In step a9, data regarding the reception frequency fm, which has an electric field strength weaker than the electric field strength Vr of the detected station, is erased from the storage means 26, and in step alO, the reception frequency fr, the electric field strength Vr, and the PI code Plr of the detected station are erased. is written in the storage means 26, and the process proceeds to step a12.

In step a12, the next frequency is set in the control means 24, and in step a13, it is determined whether the auto preset function has been completed, for example, whether the sweeping of a predetermined frequency band has been completed, or a stop key is pressed to stop the auto preset operation. Determine whether or not has been operated, and if it is not finished, return to step a2,
Repeat the auto preset operation, and end the auto preset operation when finished.

As described above, according to this embodiment, the auto preset function allows receiving frequency information, that is, receiving frequency fm,
When storing the electric field strength Vm and the PI code PIm in the storage means 26, it is possible that frequency information of stations having the same PI code, that is, broadcasting stations broadcasting programs with the same content, may be stored redundantly. Therefore, the storage means 26 can be used effectively. This eliminates the need to manually delete frequency information that has been stored redundantly, and the operability and convenience of the radio receiver 20 are significantly improved.

Although this embodiment has been described with respect to FM broadcasting in which RDS signals are multiplexed, it may also be implemented in conjunction with other broadcasting, such as television broadcasting, as long as it is broadcasting in which code signals similar to RDS signals are multiplexed. can.

Effects of the Invention As described above, according to the present invention, a single transmission frequency is selectively stored in the storage means for each identification information based on the electric field strength, so that broadcasting stations that broadcast broadcast programs with the same content can is prevented from being stored in the storage means. This allows the storage means of the receiving device to be used effectively.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the electrical configuration of a radio receiver 20 which is an embodiment of the present invention, and FIG.
3 is a flowchart for explaining an auto preset operation in FIG. 6... FM detection circuit, 9... RD S iN tuning circuit, 20... Radio receiver, 24... Control unit, 26...
Storage means, fm, fr-frequency, PIm, Plr-PI
Code, Vm, Vr - Electric field strength agent Patent attorney Keiichi Nishikyo

Claims (1)

[Claims] In a receiving device that receives and demodulates broadcast programs sent at predetermined frequencies from a plurality of broadcast stations and identification information that identifies the content of the broadcast programs, the receiving frequency of the received broadcast station is used. A frequency detection means for detecting identification information of a received broadcast program; An electric field strength detection means for detecting electric field strength at the time of reception; A receiving device comprising: a storage means for storing; and a control means for selecting a single reception frequency for each identification information based on electric field strength and storing it in the storage means.