JPS6128227A - Program identification receiver - Google Patents

Abstract

PURPOSE:To listen to a desired program and to save power consumption by providing the 1st and 2nd coincidence detection means detecting the coincidence between a program start code and a program start identification code, and between a program end code and a program end code identification code and an electronic switch and supplying power to an amplifier and/or a display device for a receiver via the electronic switch. CONSTITUTION:When the desired program selected by a program selection switch 6 is started, the 1st output from a coincidence detecting circuit 4 is given to a set input terminal S of a flip-flop circuit 7 and the electronic switch 8 is closed by an H output from a terminal D. Then the operating power supply is fed to an amplifier AMP and a display device 8, a demodulation output by a tuner section 2 is reproduced from a speaker SP and a reception frequency is displayed by a display device 10. When the present desired program is finished for reception, the 2nd output is given to a reset input terminal R of the flip- flop circuit by the incoming of the end code pattern to reset the flip-flop circuit 7, the level of the output of the terminal D goes to L to open the electronic switch 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention receives broadcast radio waves on which a program identification signal is superimposed when broadcasting specific information such as traffic information, weather forecasts, or news. It relates to radio receivers.

[Conventional technology]

The traffic information broadcasting system (i) currently being put into practical use in West Germany
ARr) has a low frequency signal for identification superimposed on 57 KHz by AM, and this signal is constantly sent out while traffic information is being broadcast.

Therefore, the receiver side is equipped with means for detecting a low frequency signal for identification, and traffic information can be heard using the output from this means as a key.

However, in such a system, although it can be effectively used to transmit one specific piece of information, such as traffic information, it can also be used to transmit different types of programs, such as weather forecasts and news, depending on the type. There is a limit to how many types of discrimination can be made so that only the necessary things can be heard.

[Purpose of the invention]

Therefore, this invention transmits a different program identification code for each type of program, and the receiver side sets the required listening program in advance, so that only one type of necessary information or multiple types of information can be transmitted. This makes it possible to listen to information, and an object of the present invention is to provide a program identification receiver that can receive such broadcasting systems.

In addition, in this invention, power consumption is reduced by stopping power supply to the amplifier that amplifies the demodulated output and/or the display mechanism of the receiver while waiting for reception. It is an object of the present invention to provide a program identification receiver that can prevent over-discharge of TV programs.

[Embodiments of the invention]

As mentioned above, this invention is capable of identifying and receiving the information content sent by broadcasting, but before explaining the configuration of the receiver, we will explain the broadcasting method used in this invention. There will be a need.

Figure 2 shows an outline of the format of the programs to be transmitted. Traffic information and other information programs have different start code patterns as shown by X in Figure 2.
It is sent in 2 bits x 4 words for 3 seconds. After this sentence, 1
ff) Information etc. are sent, and when this ends, a termination code pattern of 12 bits x 4 words is sent for 3 seconds as shown by Y, and the program moves on to the next program B.

This start and end code pattern is used in the audio signal, for example 24. Take Hz and 32Hz, FSK (Freque
The pattern is sent out as 0, 1 data by modulation. Therefore, on the receiver side, a 12-bit pattern output can be obtained by feeding 24 II z and 32 IT Z.

The start code pattern at this time can be set in various combinations within the range of several bits out of the 12 bits, and it is possible to identify many types of broadcast content by combinations of 1 and 0. can. Note that there is no problem in operation if only one type of termination code pattern is set.

The broadcasting system explained above is an example in which an identification signal is superimposed on the low frequency part of an audio signal, but in the case of medium wave radio broadcasting, for example, it is also possible to frequency modulate the carrier wave and send out an FSX signal. In this case, the receiver side can extract the FSX signal from the intermediate frequency signal.

FIG. 1 is a block diagram showing an embodiment of the present invention.
is an antenna, and 2 is a tuner section, the output of which is connected to an amplifier AMP, and the t1mA output amplified here is applied to a speaker SP and reproduced as an audio signal.

3 is a program identification signal detection circuit connected to the demodulation output terminal of the tuner section 2, and its output terminal is connected to the coincidence detection circuit 4. Outputs from a program start code pattern setting circuit 5a and a program end code pattern setting circuit 5b are applied to this -number output circuit 4, and the program start code pattern setting circuit 5a is further provided with a program selection switch. 6 is connected.

The -number output from the -number output circuit 4 is connected to the cent input terminal S of the flip-flop circuit 7, and the second match detection output from the match detection circuit 4 is connected to the flip-flop circuit 7. is connected to the reset input terminal R of.

The D output terminal of the flip-flop circuit 7 is connected to an electronic switch 8, which is controlled to close when the flip-flop circuit 7 is set and open when the flip-flop circuit 7 is reset. This electronic switch 8 has one end connected to the power supply 9 and the other end connected to the amplifier AM.
P and is connected to the display 10 of the tuner section 2,
Therefore, by closing the electronic switch 8, the operating power is supplied to the amplifier AMP and the display 10, the demodulated output provided by the tuner section 2 is amplified and reproduced from the speaker sp, and the received frequency etc. are displayed on the display 10. Is displayed. Although not shown in the drawings, operating power is directly supplied from a power source 9 to each section indicated by reference numerals 2 to 7 in FIG. 1, without going through an electronic switch 8.

FIG. 3 shows a specific example of the silk identification signal detection circuit 3, the number output circuit 4, the program start code pattern setting circuit 5a, the program end code pattern setting circuit 5b, and the program selection switch 6 in FIG. It is. That is, in FIG. 3, the program identification signal detection circuit 3 has a low-pass filter 31, a frequency discrimination circuit 32, and a comparator 33, and the demodulated output of the tuner section 2 is selected by this filter 31 only for low-frequency components, and is converted into an FSK signal. is taken out. This FSX
The signals may be, for example, 24 Hz and 32 Hz, as described above.
This signal is discriminated by a frequency discrimination circuit 32, and the shift information is extracted by a comparator 33 as a 12-bit digital signal.

This 12-bit digital signal is applied as a serial signal to a shift register 41, and this register 41 converts this serial signal into a parallel signal and outputs it to a terminal. ~ bring to DI+. Each output terminal Do=D of this shift register 41
I+ is connected to each one input terminal of an exclusive OR circuit (hereinafter referred to as EX-OR) 43. (
(In FIG. 3, EX-OR is shown as a representative one, and the others are omitted.) Also, each other input terminal of this EX-OR 43 is connected to the output terminals of 12 columns in the program start code pattern setting circuit 5a. Each EX-OR 43 compares each bit between the shift register 41 and the program start code pattern setting circuit 5a. Each comparison output of this EX-OR 43 is input to the NOR circuit 44, and therefore only when each bit of the shift register 41 and each bit of the program start code pattern setting circuit 5a all match.
.

The R circuit 44 acts to provide the I] output.

Similarly to the above, each output terminal Do"-D of the shift register 41
Each input terminal of the EX-OR 45 is connected to o, and each output terminal of the program end code pattern setting circuit 5b is connected to the other input terminal, and the output of each EX-OR 45 is input to a NOR circuit 46. There is. Therefore, the NOR circuit 46 produces an H output only when the bits of the shift register 41 and the program end code pattern setting circuit 5b all match.

The program selection switch 6 is composed of, for example, a button switch that can be turned on or off independently, and by turning it on, a predetermined number corresponding to a specific program is selected.
The 2-bit pattern is the program start code pattern setting circuit 5.
A is output as parallel data.

Therefore, when the desired program selected by the program selection switch 6 is started, the first output is provided from the negative output circuit 4 to the cent input terminal S of the flip-flop circuit 7.
The electronic switch 8 is closed by the H output from the D terminal. Therefore, as described above, operating power is supplied to the amplifier AMP and the display 8, the demodulated output from the tuner section 2 is reproduced from the speaker SP, and the received frequency etc. are displayed on the display 10.

When the reception of the desired program set in advance is completed,
Due to the arrival of the termination code pattern, the above-mentioned - several schools appeared]? δ4
A second output is then provided to the reset input terminal R of the flip-flop circuit 7, so that the flip-flop circuit 7 is reset and the output of its D terminal becomes L, opening the electronic switch 8. Therefore, the supply of operating power to the amplifier AMP and the display 10 is stopped, and the reproduction of the demodulated output from the speaker SP and the display of the received frequency and the like are also stopped.

〔Effect of the invention〕

Since this invention is configured as described above, when a desired information program is broadcast, it is automatically played back so that the information can be reliably heard, and the information program is It has the function of stopping the playback when the playback ends and transmitting only what the individual desires and needs.

In addition, the system is configured to cut off the operating power to the amplifier and display when the reception mode is not desired, so even if the reception mode is set for a long time while the car is stopped (engine is stopped), the battery will not be overcharged. The inconvenience of causing discharge can be prevented.

In the embodiments described above, the power supply to both the amplifier and the display device is stopped during standby, but the power supply to only one of them may be stopped if necessary.

Other methods include muting the amplifier or blocking data transmission to the display.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a format diagram of a program in the broadcasting system used in the present invention, and FIG. 3 is a specific example of a program identification signal detection circuit and several output circuits. It is a wiring diagram showing an example. DESCRIPTION OF SYMBOLS 1...Antenna, 2...Tuner section, 3...Program identification signal detection circuit, 4...-Several calibration output circuit, 5a...
Program start code pattern setting circuit, 5b... Program end code pattern setting circuit, 6... Program selection switch, 7.
...Flip-flop circuit, 8...Electronic switch, 9
...power supply, 10...indicator, AMP...amplifier,
sp...Speaker.

Claims (1)

[Claims] In a receiver that receives broadcast waves with a program identification code superimposed on a carrier wave or a part of the audio band, the program start code obtained from the carrier wave or reception demodulation output and the program start identification code preset on the receiver side are a first coincidence detection means for detecting a coincidence; a second coincidence detection means for detecting a coincidence between a program end code obtained from a carrier wave or a received demodulated output and a program end identification code set in advance on the receiver side; 1st above
an electronic switch that is closed by the output of the second coincidence detection means and opened by the output of the second coincidence detection means;
A program identification receiver configured to supply power to an amplifier for amplifying the received demodulated output and/or a display of the receiver via the electronic switch.