JPH063883B2 - Additional information receiver - Google Patents

Description

The present invention relates to an additional information receiver that receives additional information data.

(B) Conventional technology In recent years, RDS (radio) that multiplexes digital data such as alternative frequency data and traffic information identification signals into FM radio signals.
(data system) is drawing attention. This RDS standard is the RDS specification "S" compiled by the European Broadcasting Union (EBU).
pecifications of the Radio Data System RDS for VHF
/ FM Sound Broadcasting, "EBU Document Tech.3244-E,
Mar. 1984. According to this, RDS
Data consists of 4 blocks as one group, a PI code (Program identification code) is always written in the first block, and a second block shows what is written in the third and fourth blocks. It is an address block to be designated.

By the way, in the RDS receiver, since it is necessary to process the RDS data and the normal digital tuning process, a microcomputer having a high processing capability is required. Therefore, it is desirable to use two microcomputers, perform RDS data processing on the one hand, and perform digital tuning processing including key scanning and muting control on the other hand to transfer data between the respective microcomputers. However, in order to transfer data between the microcomputers, it is necessary to perform interrupt processing, and there is a drawback that the response time is generally slow.

(C) Problems to be Solved by the Invention Accordingly, one microcomputer detects the TA code (identification code in traffic information broadcast), transfers the data to the other microcomputer, and the other microcomputer When switching the functions and muting control to make the traffic information playable, it became impossible to play the traffic information for the data transfer time between the respective microcomputers (the importance of traffic information is that of general broadcasting). It is generally high compared to the other, and it is not preferable to lack some traffic information.

(D) Means for Solving the Problem An additional information receiver of the present invention is such that a signal relating to reception of a specific program from the first microcomputer is given to the second microcomputer via a key matrix circuit.

(E) Operation The present invention is configured as described above, and since the second microcomputer can detect the signal related to the reception of the specific program from the first microcomputer by the key scan, it is not necessary to perform the interrupt processing and the normal operation is possible. The routine processing enables function switching and / or muting control in a very short time.

(F) Embodiments Embodiments of the present invention will be described with reference to the drawings. Figure 1 shows
The block diagram of the RDS receiver of this invention is shown, (1) the antenna, (2) the tuner circuit which inputs the signal of this antenna, outputs the FM demodulation signal, the local oscillation circuit is formed with the PLL synthesizer There is. (3) is the tuner circuit (2)
RDS decoder that demodulates the RDS modulated signal extracted from the FM demodulated signal, reproduces the clock, and performs group synchronization and error correction of the demodulated RDS data, (4) is a tape circuit that outputs the reproduced signal of the cassette tape, ( Five)
Is a function switch for selectively switching the output signals of the tuner circuit (3) and the tape circuit (4), and (6) is an amplifier for amplifying the output signal of the switch via the muting circuit (7). (8) is the function switch (5)
A driving circuit (9) for driving a preset key (P1) to access frequency data stored in advance in a memory of a second microcomputer (11) described later.
(P3), a memory key (M) used for writing the frequency data in the memory, a traffic information key (TP) for giving a command to receive traffic information, and a tape / command for switching between tape and radio. Radio key (T / R) and TA key (TA) for instructing the start of reproduction of traffic information
Is a key matrix circuit including. Here, the preset keys (P1) to (P3), the memory key (M), the traffic information key (TP) and the tape / radio key (T / R) are momentary switches, and the T / A key (TA) is a transistor switch. It is composed of. A control signal output from TAOUT of the first microcomputer (10) described later is given to the transistor switch which is the T / A key (T / A), and is turned on based on this control signal.
-It is configured to turn off. (10) is the RDS
The first microcomputer that processes the RDS data from the decoder (3) outputs the control signal of the TA key (TA) from TAOUT. (11) is the second microcomputer,
The key matrix circuit (9) is scanned and data is transferred with the first microcomputer (10).
Frequency data is given to the local oscillation circuit of the tuner circuit (3), and the drive circuit (8) and the muting circuit
Control (7).

FIG. 2 shows a TP (Traffic program idenification) (traffic information broadcasting station identification signal) code and a TA (Traffic annou).
ncement identification) (identification signal during traffic information broadcasting), it shows the format of one group of RDS data, and the TP code and TA code (1 bit each) are assigned to a predetermined position of the second block.

The relationship between the TP code and the TA code is defined as shown in the table below.

FIG. 3 is a timing chart, and the operation will be described below based on this. First, tape / radio key (T / R)
The tape circuit (4) is selected by, the second microcomputer (11) switches the function switch (5) to the tape circuit (4) side through the drive circuit (8), and then the traffic information key (TP). ) Is operated, the first microcomputer (10) and the second microcomputer (11) search for a traffic information broadcasting station and make the tuner circuit (2) stand by at a predetermined station. Then, in this state, when the second microcomputer (11) detects the TA code "1" a predetermined number of times within a predetermined time, it changes TAOUT from "L" level to "H" level and the TA key Turn on (TA). At this time, since the second microcomputer (11) constantly performs the key scan, it immediately detects the change of the TA key (TA) and outputs the mute signal to the muting circuit (7) for a predetermined time, and , Function switch (5) via the drive circuit (8) while outputting this mute signal
Is switched to the tuner side and the traffic information is reproduced. Next, when the first microcomputer (10) does not detect the TA code "1" for a predetermined time, it changes TAOUT from "H" level to "L" level and turns off the TA key (TA). . At this time, the second microcomputer (11) outputs a mute signal to the muting circuit (7) for a predetermined time in the same manner as described above, and while outputting the mute signal, the second microcomputer (11) passes through the drive circuit (8). Switch the function switch (5) to the tape side.

FIG. 4 shows a block diagram of an RDS receiver according to another embodiment, which will be described below by using the same reference numerals in the same configuration as FIG. Reference numerals (101) and (102) denote first and second tuner circuits that receive the signal of the antenna (1) and output an FM demodulated signal. The local oscillator circuit is composed of a PLL synthesizer. (103) is the first and second tuner circuits (101), (102)
Tuner selector switch that selectively switches the output signal of
Reference numeral 04) is a drive circuit for driving the tuner changeover switch. In this case, the RDS decoder (3) inputs the output signal of the first tuner circuit (101), and the first microcomputer (10) processes the frequency data in the first tuner circuit (101) in addition to processing the RDS data. And controls the drive circuit (104).

Therefore, in this configuration, the tuner selector switch (1
With the second tuner (102) side selected by 03) (function switch (5) may be either), search the traffic information broadcasting station with the first tuner circuit (101) as in the case of FIG. To do. Then, the first microcomputer (1
When TAOUT of 0) changes from "L" level to "H" level, the second microcomputer (11) outputs a mute signal and always switches the function switch (5) to the tuner side, or the first microcomputer. (10) switches the tuner selector switch (103) to the first tuner (101) side at the switching timing of the function switch (5). Furthermore, TAOUT of the first microcomputer (10)
Is changed from "H" level to "L" level, the second microcomputer (11) outputs a mute signal and returns the function switch (5) to the original state,
Further, the first microcomputer (10) has a tuner changeover switch (10) at the changeover timing of the function switch (5).
3) is switched to the second tuner circuit (102) side.

(G) Effect of the Invention The present invention is configured as described above, and since the second microcomputer can detect the signal related to the reception of the specific program from the first microcomputer by the key scan, it is not necessary to perform the interrupt processing. The processing can be performed by a normal routine, and it is possible to shift from the detection of the reception of the specific program to the reproduction of the specific program in a very short time, and it is possible to prevent a part of the specific program from being lost.

[Brief description of drawings]

FIG. 1 is a block diagram of an RDS receiver of the present invention, and FIG. 2 is a diagram showing a format of RDS data, and FIG.
The same figure is a timing chart, and FIG. 4 is a block diagram of an RDS receiver of another embodiment. (2) ... Tuner circuit, (101), (102) ... First and second tuner circuits, (3) ... RDS decoder, (9) ... Key matrix circuit, (10) ... First microcomputer, (11) … Second microcomputer.

Claims (1)

[Claims] 1. A receiver for receiving additional information data included in an FM broadcast signal, comprising: a tuner circuit for receiving FM broadcast; and additional information data extracting means for extracting the additional information data from the FM broadcast signal of the tuner circuit. A first microcomputer for processing the additional information data from the extracting means, a key matrix circuit including at least a key for instructing a change of the reception frequency, and a data transfer with the first microcomputer and the key matrix circuit. A second microcomputer for monitoring output, the second microcomputer being configured to input a signal relating to reception of a specific program from the first microcomputer via the key matrix circuit, and It is possible to control so that the specific program is reproduced upon detection. Additional information receiver according to claim.