JPS6128226A - Program identification receiver - Google Patents

Abstract

PURPOSE:To listen surely to a required listening program by providing a means detecting the coincidence between a program start code and a program start identification code preset at the receiver side and reproducing a reception demodulation output and a means receiving an output from a timer and stopping the reproduction of the reception demodulation output so as to preset the required program. CONSTITUTION:When a desired program selected by a program selection switch 6 is started, the 1st output is given to a set input terminal S of a flip-flop circuit 7 from a coincidence detecting circuit 4 and an output H is fed to a control circuit 8 from a terminal Q. Then an amplifier AMP amplifies a demodulated output from a tuner section 2 and reproduces it from a speaker SP. When a desired information program is finished for reproduction, the 2nd output is given to an OR circuit 9 by the coincidence detection circuit 4 with the incoming of an end code pattern and an H output is fed to a reset input terminal R of the flip-flop circuit 7. Thus, the Q output of the circuit 7 goes to L, muting is fed to the amplifier AMP or the operating power is interrupted to stop the reproduction of the demodulated output from the tuner section 2.

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 (commonly known as API) currently in use in West Germany uses AM to superimpose a low-frequency signal for identification on 57 KHz, 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. However, there is a limit to how many types of discrimination can be made so as to select only what is necessary.

[Purpose of the invention]

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

In addition, in this invention, when a program end identification code is received, the playback is automatically stopped so that only the desired information can be listened to. The program identification receiver is equipped with a function to forcibly cancel the playback after a predetermined period of time (when the car enters a tunnel, etc.), and can avoid unnecessary reception that is not desired. This is what we are trying to provide.

[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.
2 bits x 4 words are sent for 3 seconds. After that, traffic 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 takes, for example, 24 Hz and 32 Hz in the audio signal, and is called 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 an FSK demodulator that discriminates between 24 Hz and 32 Hz.

This l11 start code pattern can be set in various combinations within the range of several bits out of the 12 bits, and the combination of 1.0 makes it possible to identify many types of broadcast content. can do. Note that there is no problem in operation if only one type of termination code pattern is set.

The broadcasting system described above is an example in which an identification signal is superimposed on the low frequency portion 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 F'SK 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 demodulated 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 1 summer tone output terminal of the tuner section 2, and the output terminal thereof 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 the coincidence detection circuit 4, and a program selection switch 6 is further connected to the program start code pattern setting circuit 5a. It is connected.

The first coincidence detection output from the coincidence detection circuit 4 is connected to the set input terminal S of the RS flip-flop circuit 7,
Furthermore, the Q output terminal of this RS flip-flop circuit 7 is connected to a control input terminal of a control circuit 8. This control circuit 7 receives the Q output of the flip-flop circuit 7 L-1
A control output is sent to the amplifier AMP, which acts to amplify the reproduced signal from the tuner section 2 and output it to the speaker SP.

On the other hand, the second coincidence detection output terminal from the coincidence detection circuit 4 is applied to one input terminal of the OR circuit 9.
The output terminal G of the circuit 9 is connected to the reset input terminal R of the flip-flop circuit 7. -1- OR circuit 9
The output terminal 1 of a timer circuit 10 is connected to the other input terminal of the oscillator 11, and this timer circuit 10 receives the Q111 output of the flip-flop circuit 7 and is cleared, counts up the output of the oscillator 11, and counts up the output of the oscillator 11 to a predetermined value. According to the count amount of , Qn acts without producing an output l].

FIG. 3 shows a specific example of the program identification signal detection circuit 3, coincidence detection circuit 4, program start code pattern setting circuit 5a, program end code pattern setting circuit 5b, and program selection switch 6 in FIG. 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 filtered by this filter 31 to select only the low-frequency components. The FSK signal is extracted. This FS
As mentioned above, the X signal is, for example, 24 Hy, and 32
This is a shift-keyed signal of Hz, which is discriminated by the frequency discrimination interval 12832, and the comparator 33
The shift information is extracted as a 2-bit digital signal.

This 12 hit 1 digital signal is shifted;・Register 41
This register 41 converts this serial signal into a parallel signal and sends it to the terminal. ~Do bring. Each output terminal Do"D of this shift register 41
++ is connected to each one input terminal of an exclusive OR circuit (hereinafter referred to as EX-OR) 43. (
In Figure 3, EX-OR is shown as a representative one, and the others are omitted) Also, this EX-01-? Each of the 43 input terminals is connected to the input terminal 1 in the program start code pattern setting circuit 5a.
It is connected to two columns of output terminals, and each EX-OR 43 compares each hint between the shift register 41 and the program start code pattern setting circuit 5a. This EX-OR43
Is each comparison output Nor? Therefore, the above N is inputted to the circuit 44 only when each bit of the shift register 41 and each bit i in the program start code pattern setting circuit 5a all match.

It acts so that the R circuit 44 provides an output of (1).

Similarly to the above, each output terminal I]o~[ of the shift register 41
)+1 has IEX-OR, 45 each, and the other input terminals have program end code pattern setting circuit 5.
The output terminals of EX-OR 45 are connected to each other, and the output of each EX-OR 45 is input to a NOR circuit 46. 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 starts, the first output is sent from the coincidence detection circuit 4 to the set input terminal S of the flip-flop circuit 7, and the output I from the Q terminal is controlled. Applied at 1/8th B. As a result, the amplifier AMP amplifies the demodulated output from the tuner section 2 and reproduces it through the speaker SP.

When the desired information program has been reproduced in this manner, a second output is provided from the coincidence detection circuit 4 to the OR circuit 9 due to the arrival of the end code pattern, and is passed through the OR circuit 9 to the reset input of the flip-flop circuit 7. A force of 11 m is applied to terminal R. For this reason, the Q output of the 7Pflosop circuit 7 becomes +7, and muting is applied to the amplifier AMP via the control circuit 8, or its operating power is cut off, and reproduction of the demodulated output from the tuner section 2 is stopped.

In addition, while receiving and playing the desired information program, for example, the 1 channel may be entered and the program end code may not be received, and even though the desired broadcast program has ended, other broadcast programs may not be received and played. A situation may arise where the situation persists.

In order to prevent this, in this embodiment, the Q output terminal of the flip-flop circuit 7 is connected to the clear input terminal of the timer circuit 10, and as soon as the Q output becomes [■], the timer circuit 10 receives the clock from the oscillator 11. count amplifier for a predetermined amount (for example, 5 minutes or 1 minute).
0 minutes), the terminal Qn is configured to provide an H output to the OR circuit 9. As a result, a reset input is input to the flip-flop circuit 7, forcing the flip-flop circuit 7 into a reset state and stopping reproduction of the demodulated output from the tuner section 2.

〔Effect of the invention〕

Since this invention is configured as follows, 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 When the playback is completed, the playback can be stopped and automatically switched to playback using a tape recorder, for example.

Furthermore, even if the end code of a program is missed, the reproduction of the program can be stopped after a specific time has elapsed due to the action of the timer circuit, thereby preventing the inconvenience of continuing to reproduce an undesired program.

[Brief explanation of drawings]

Figure 1 is a block diagram showing an example of the fruits of this invention;
FIG. 3 is a diagram showing the format of a program in the broadcast system used in the present invention, and FIG. 3 is a result diagram showing a specific example of a program identification signal detection cycle and a coincidence detection circuit. DESCRIPTION OF SYMBOLS 1... Antenna, 2... Tuner part, 3... Program identification signal detection circuit, 4... Coincidence detection circuit, 5a...
Program start code pattern setting circuit, 5b... Program end code pattern setting circuit, 6... Program selection switch, 7.
...Flip-flop circuit, 8...Control circuit, 9...
-OR circuit, 10...timer circuit, 11...oscillator, AMP...amplifier, SP...speaker.

Claims (2)

[Claims] (1) In a receiver that receives broadcast waves with a program identification code superimposed on a carrier wave or part of the audio band, the program start code obtained from the carrier wave or reception demodulation output and the program start identification preset on the receiver side are used. a coincidence detecting means for detecting coincidence with the code; a means for receiving the output of the coincidence detecting means and reproducing the received demodulated output; and a timer means for starting counting elapsed time upon receiving the output of the coincidence detecting means; A program identification receiver comprising means for receiving the output from the timer means and stopping reproduction of the received demodulated output after a predetermined time has elapsed. (2) In a receiver that receives broadcast waves with a program identification code superimposed on a carrier wave or part of the audio band, the program start code obtained from the carrier wave or reception demodulation output and the program start identification preset on the receiver side are used. a first coincidence detection means for detecting a coincidence with a code; and 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 preset on the receiver side. means for receiving the output of the first coincidence detecting means and reproducing the received demodulated output; and timer means for starting counting the elapsed time upon receiving the output of the first coincidence detecting means; an OR means for generating an output upon receiving either the output of the timer means or the output of the second coincidence detection means obtained after the elapse of the time period; A program identification receiver comprising means for.