JPS60249435A - Program discriminating receiver - Google Patents

Abstract

PURPOSE:To listen to only required information by transmitting a program discrimination code and setting preliminarily a required listening program in the receiver side. CONSTITUTION:For example, 24Hz and 32Hz in an audio signal are taken to transmit program start and end code patterns as data ''0'' and ''1'' by FSK modulation. If the transmitted code pattern coincides with a code pattern set in the receiver side, a controller 71 receives this coincidence signal and outputs a key off signal to a controller terminal of a switch 81 and separates a keyboard part 8 and key scan input terminals Q0-Q2 in a high impedance to make it impossible to change the reception frequency and the reception band and receives the program corresponding to the coinciding code pattern. When the program is terminated, the controller 71 detects this termination and releases transmission of the key off signal.

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 Kl-Iz, and this signal is constantly sent out while traffic information is being broadcast. has been done.

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 are limits to being able to distinguish between different types of things so that you only hear what you need.

[Object of the present invention] Therefore, the present invention transmits different program identification codes for each type of program, and the receiver side sets the necessary listening programs in advance, so that only the necessary information of the IMH or It is possible to listen to various types of information, and the object of the present invention is to provide a program identification receiver that can receive such broadcasting systems.

Furthermore, as mentioned above, different program identification codes can be reproduced and used, so as will become clear later in the explanation, the receiver is capable of distinctive operations, making it possible to create a receiver that is easy for users to use. It becomes possible to provide

[Example of the present 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 the outline of the format of the programs to be transmitted. Traffic information and other programs have different start code patterns of 12 bits x 4 words, as shown by X in Figure 2. Sent for 3 seconds. After this, traffic information etc. are sent, and when this ends, an end code pattern of 12 pints 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, 24Hz and 32H,z in the audio signal, and is called FSK (Frique
cy 5hift Keying) modulation to 0,
The pattern is sent out as 1 data. Therefore, on the receiver side, a 12-bit pattern output can be obtained by using an FSX demodulator that distinguishes between 24 Hz and 321 (z).

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

FIG. 1 is a block diagram showing an embodiment of the present invention.
2 is an antenna, and 2 is a tuner section, the output of which is connected to the output terminal Out, where the output of the tuner for eight cycles is obtained.

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; This coincidence detection circuit 4 is configured to receive outputs from a program start code pattern sending circuit 5a and a program end code pattern sending circuit 5b, and a program selection switch 6 is further connected to the program start code pattern sending circuit 5a. It is connected.

The output end of the coincidence detection circuit 4 is connected to a control circuit 7, which receives a command signal from the keyboard 8 and a detection signal from the coincidence detection circuit 4, and controls the tuning of the tuner section 2. Alternatively, control such as band switching is performed.

FIG. 3 shows the program identification signal detection circuit 3, coincidence detection circuit 4, and program start code pattern transmission times F! in FIG. ! I5a
, a specific example of the program end code pattern sending circuit 5b and the program selection switch 6 is shown. That is, the third
In the figure, the program identification signal detection circuit 3 is a low-pass filter 3.
1, a frequency discrimination circuit 32, and a comparator 33. Only the low frequency components of the demodulated output of the tuner section 2 are selected by the filter 31, and an FSK signal is extracted. As mentioned above, this FSK signal is obtained by shift-keying the 241-[z and 32Hz signals, for example, and is discriminated by the frequency discrimination circuit 32 and sent to the comparator 33.
The shift information is extracted 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 Dl+. Each output terminal Do"D of this shift register 41
n is connected to each one input terminal of an exclusive OR circuit (hereinafter referred to as EX-OR) 43. (Figure 3 shows EX-OR as a representative, and the others are omitted)
Further, each other input terminal of this EX-OR 43 is connected to the output terminal of 12 columns in the program start code pattern sending circuit 5a, and each EX-OR 43 controls the shift register 41 and the program start code pattern sending circuit 5a. Compare each bit. Each comparison output of this EX-OR 43 is input to a NOR circuit 44, and therefore, only when each bit of the shift register 41 and each bit of the program start code pattern sending circuit 5a all match, the above N is executed.

The R@ path 44 acts to provide an H output.

Similarly to the above, each output mDo to D1 of the shift register 41
1 is connected to each input terminal of the EX-OR 45, and the other input terminal is connected to each output terminal of the program end code pattern sending circuit 5b, and the output of each EX-OR 45 is input to a NOR circuit 46. There is. Therefore, only when all the hints in the shift register 41 and the program end code pattern sending circuit 5b match, the N and OR circuit 46 outputs a 1 (output).

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 sending circuit 5.
A is output as parallel data.

FIG. 4 shows details of the control circuit 7 and keyboard 8 portions. This control circuit 7 includes a PLL section 72 that supplies a local signal to be applied to the tuner section 2, and a PLL section 72 that supplies a local signal to be applied to the tuner section 2.
A controller 71 that controls the local signal frequency etc. generated in the section. and a keypad 73 connected to the keyboard 8. The keyboard 8 also has an analog switch 8 that passes or blocks the keyboard column output.
1 is connected.

The controller 71 always sequentially outputs I] pulses to the rows of the keyboard 8, namely Ko, +, and 2. For example, when the 6nd moment Chris isochi in Fig. 41 is pressed, H Pulse is Ko
is sent to the Qo scan input, and the controller 71 switches the receiving hand of the tuner section 2 and changes the data of the PLL section 72 depending on the presence or absence of this H pulse, thereby enabling reception of other bands.

If the transmitted code pattern matches the code pattern set on the receiver side, the controller 71 receives this matching signal and outputs a key-off signal to the control terminal of the analog switch 81, and performs key scanning with the keyboard section 8. The input terminal Qo" is separated from the input terminal Q2 by high impedance. Therefore, once the program identification signal is received, it is impossible to change the receiving frequency of the receiver or the receiving hand even if you operate the keyboard 8. On the other hand, when the program ends, When the termination code pattern is received, a termination command signal is applied to the controller 71 by the minus number output circuit 4, the sending of the key-off signal from the controller 71 is canceled, and when the keyboard 8 is pressed, the manual part of the key scan is activated. The controller 71 performs operations corresponding to the switches on the keyboard 8, making it possible to switch the reception frequency and reception band.

[Effects of the present invention]

As described above, according to the present invention, when a program has been identified and reception has started, changing of the reception frequency and reception band is prohibited, even if the channel selection button is operated incorrectly during reception. You can also hear all the information you want.

Furthermore, even if a receiver and tape player are combined and an interrupt means is added to receive identification signals and listen to traffic information while the tape player is playing, changing the receiving frequency and receiving band is prohibited during reception. Therefore, it is possible to receive the next program end pattern without missing it, and it is possible to reliably control the tape player to start operating again in response to this program end pattern. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of this invention, FIG. 2 is a diagram of the format of a program in the broadcasting system used in this invention, and FIG. A wiring diagram showing a specific example, FIG. 4 is a block diagram showing the connection relationship with the control circuit and the keyboard. ■...Antenna, 2...Tuner section, 3...Program identification signal detection circuit, 4...-Several output circuit, 5a...
Program start code pattern sending circuit, 5b... Program end code pattern sending circuit, 6... Program selection switch, 7.
...Control circuit, 8...Keyboard.

Claims (1)

[Claims] A receiver that receives broadcast waves with a program identification signal superimposed on a part of the audio band includes an identification signal detection means for detecting the program identification signal, and an output of the identification signal detection means and a preset program identification code. 1. A program identification receiver comprising: a coincidence detecting means for detecting a coincidence, the program discriminating receiver being configured to prohibit a change in receiving frequency or receiving hand upon receiving an output from the coincidence detecting means.