JPS6265516A - Stereo receiver for automobile - Google Patents

Abstract

PURPOSE:To realize the operation of preset scanning with ease of use by fetching information such as cassette tape reproduction, radio broadcast, ARI station or information into a CPU while the preset scan of the ARI mode is in progress. CONSTITUTION:When the preset scan is applied in the ARI mode at the radio broadcast state, a preset station is scanned while the ARI station is held for a prescribed time and the said station is held till the end of information only when the information of traffic information is applied. In case of the preset scan in the ARI mode during the cassette tape reproduction state, only when the information of the traffic information is applied, the said station is held till the end of information, and after the end, the preset scan is restarted and the cassette tape is restored to the reproducing state.

Description

[Detailed description of the invention]

[Industry, 1-Field of Application 1 The present invention is directed to traffic information swallowing (Automobile R
adi. information (hereinafter abbreviated as API)
The present invention relates to a stereo receiver for an automobile equipped with a car stereo with a built-in receiver.

[Summary of the invention]

The present invention provides the following features: When performing a bricht scan in ARI mode during radio A broadcast or cassette tape playback,
This is a stereo receiver for automobiles that can automatically switch to broadcasting traffic information from a preset station.

[Prior Art 1] In recent years, there has been a demand for traffic information systems to alleviate traffic congestion, and ARIfi transmission has already been adopted as a traffic information system in West Germany. The above API broadcasting system has a three-step system configuration using SK, [)K, and BK multiplied signals, and each step is as listed below. h) Broadcasting system using SK double signal FM broadcasting stations that adopt this system have a 57KH2 t1 signal as an identification signal, frequency modulate this to the main carrier, and broadcast it, and the in-vehicle receiver side receives 57KH2.
By detecting the presence or absence of KHz, it is possible to distinguish between FM broadcasting stations that are broadcasting traffic information, and receive traffic information by receiving broadcasts from the FM broadcasting station. (2)r) Using K signals Broadcasting System FM broadcasting stations that adopt this system will broadcast general program broadcasts (in addition to the traffic information broadcast station identification signal using the SK double signal mentioned above
SK double signal 57KHzkmD is used for traffic information broadcast sporadically (approximately 4 roads per hour) in between (music, news, etc.)
Broadcast with K signal added. 57Kt-1 of this DK signal
z is amplitude-modulated at 125KHz, and the main carrier is frequency-modulated and broadcast, and the receiver side transmits 57K.
By detecting the OK signal that is amplitude modulated to H2, it is possible to identify that traffic information is being broadcast. This OK double signal identification makes it possible to distinguish between general program broadcasts and traffic information broadcast in between. 1) to prevent missing traffic information, or to switch to traffic information reception by detecting l') K signal during cassette tape playback. (3) Broadcasting system using BK double signal FM broadcasting stations that adopt the Kono system broadcast local traffic information and different traffic information for each region, so BK double signal and SK double signal are used as area identification signals. 57Kl
- AQ is sent by applying amplitude modulation to IZ. B by region
The modulation frequency of each K-fold signal is an integer fraction of 57Kl-12, and in the ART system, it is 23.75 Hz,
28.27 Hz, 34.93 Hz, 39,
581-1z, 45.6Hz, 53.98H
It is divided into six categories of z. On the receiver side, by identifying the BK double signal, it is possible to receive regional traffic information. As an FM receiver for such a traffic information system as described above, one having the configuration shown in FIG. 6 has been known. A typical P L l synthesizer tuner is shown here, including a high frequency amplifier 1. Mixer 2. Intermediate frequency amplifier4. A receiving circuit including an FM detector 5° multiplexer 6, a volume 7, a low frequency amplifier 8, and a speaker 9,
The local oscillator 3 in the front end is used as a voltage controlled oscillator, and the microcomputer 11 generates P
A channel selection circuit is provided. The microcomputer 11 has a configuration of a -L distribution PLl- channel selection circuit, which divides the vCO signal of the local oscillator 3, compares this frequency-divided signal with a reference frequency signal, and obtains a phase comparison output. A circuit 12 is provided, and the phase comparison output is converted into a control voltage applied to the local oscillator 3 via a low-pass filter 10. In the microcomputer 11, the CP
U13 controls the P1-1 circuit 12, and the RAM 14 has several preset memory addresses A-F. Then, when the switch 15 for preset scanning is turned on, the CPU 13 scans the preset station while having a hold time of several seconds from the station next to the currently called preset station. For example, if the preset scan switch 15 is turned on while receiving channel A, the channel shifts to channel B, and after holding for several seconds, shifts to channel C. Continuing this operation I
f calls channels one after another like A-+B→C-r)...F-IA)B... [Problems to be Solved by the Invention] Receiving API broadcasts using such a preset scan method has the disadvantage that it is very difficult to use due to the relationship with the above-mentioned API broadcast system. The present invention has been made based on the above circumstances, and is based on the API
When operating the preset scan mode, the CPU captures information such as whether the vehicle is playing a cassette tape, radio broadcasting, API station, information, etc., allowing for easy-to-use preset scan operation. The purpose of this invention is to provide a stereo 6-A receiver. (Means for Solving the Problem 1) For this purpose, the present invention provides a power hit car stereo receiver with a built-in ARI receiver, which is equipped with a preset scan function that constantly scans preset memory stations. When performing a preset scan in API mode, hold the ARI station for a predetermined time while scanning the preset station, and hold the same station until the end of the information only if traffic information is being provided. When performing a preset scan in ARI mode, only if traffic information is being provided, hold the station until the information ends, and then restart the preset scan and switch to API mode to return to the cassette tape playback state. [Embodiment] Hereinafter, an embodiment of the present invention will be specifically explained with reference to FIGS. 1 to 5. In FIG. 1 to 5
is the same as the configuration in the description of the conventional example, so the same parts are given the same reference numerals and the description will be omitted. Furthermore, here, reference numeral 16 is a switch signal during playback of the cassette tape, which is taken into c p Ll 13 . Also, the sign @1
7 is an SK decoder which takes out an SK multiplied signal from the output of the 1M detector 5;
3rd: Determine the ARI station from which the data is being taken in. Further, reference numeral 18 is a DK decoder which also takes out the r)K signal from the output of the 1M detector 5, and in order to determine whether the ARI station is broadcasting traffic information (information is being provided), the signal is sent to 11. CPU 13
be incorporated into. Reference numeral 19 is a source switching switch provided between the multiplexer 6 and the volume 7, and is used to switch between radio broadcasting and tape recorder playback broadcasting. The switch 19 is connected to the DK decoder 1
When the DK double signal is decoded from 8, the source is switched to the radio broadcasting side. Further, when the magnetic head 21 reproduces data as usual, the signal is sent to the volume 1 via the equalizer 20 and the switch 19. With this configuration, when the API broadcast mode is not set, that is, when the API switch 22 is in the OFF state, radio broadcast or tape recorder playback is performed as usual. When the API switch 22 is turned on (API broadcast mode), when the preset scan switch 15 is turned on in the radio broadcast state, only ARI stations are preset scanned and held for several seconds. If information is being provided (issuing traffic information) during this time, the information will be held until the end of the information. Here, after starting a preset scan and calling a preset channel, the CPU 13 determines whether or not the SD double signal FM station is being received as a signal from the 1F amplifier (signal 23). If there is an SD multiplied signal, it is assumed that the preset channel is being received, and then the CPLJ 13 looks at the Sr) signal and the SK multiplied signal. If the preset channel being received is an ARI station, the SK decoder 17 decodes the presence or absence of the SK multiplied signal, since the SK multiplied signal is being transmitted.
If there is a K times signal, information on the SK times signal is given to the CPU 13. Further, the SK decoder 17 outputs the SK multiplied signal A.
Detects the M-modulated DK multiplied signal. The DK double signal is a signal that is constantly used by ARI stations during information. Then, the CPU 13 receives the SD multiplied signal S
When the K times signal is detected and it is determined that an ARI station is being received, that station is held for several seconds and at the same time the signal from the DK decoder 18 to 11 is observed. By looking at the DK double signal, it becomes clear whether or not information is currently in progress. If there is a DK double signal, the hold state is maintained until the rlK signal disappears. When there is no OK double signal, the hold is released and the station moves to the next preset station. A preset scan can be realized by sequentially repeating this operation. -F In the explanation, in the case of 8R1 station, if there is no SD double signal or SK double signal of that preset channel, the next preset channel is immediately called. This time chart is as shown in FIG. The pre-hat scan operation during tape playback is as follows. During tape playback, nothing other than information is needed, so if the r')K signal is not present, the ARI station immediately shifts to the next channel. When an ART station providing information is detected, the tape playback sound is switched to radio broadcasting (by switching the switch 19), so that the information can be heard. For this purpose, when the preset scan switch 15 is turned on, the CPU 13 calls the next preset channel, detects the SD double signal, detects the SD double signal SK Shintan, and scans this and that. Initiate a hold. Then, the hold is continued until there is no DK double signal. r) K decoder 18
If the switch 19 is changed when the DK double signal is present and the preset scan is performed during tape playback, whether or not to hold the OK double signal will be determined by the presence or absence of the OK double signal, and during the hold period, the radio broadcast will be listened to even while the tape is being played. be. CPU
13 continues to detect the presence or absence of the DK double signal, and
As soon as there is no doubled signal, it moves to the next preset channel. Similarly, for the next channel, the operations of detecting the SD multiplied signal, the SK multiplied signal and the SD multiplied signal, and the DK multiplied signal detection are performed. When the OK decoder 18 determines that the OK signal has been issued at the time of transition to the next channel, the switch 19 is switched to return to tape playback. Further, the CPU 13 determines based on the signal 16 whether or not the tape is being played back. Such operation continues until the preset scan switch 15 is turned off. Although the above embodiment shows the case where it is applied to preset scanning, it is natural that it can also be applied to the case of normal A-1 tuning. Adaptable. In other words, it is not limited to PLL channel selection tuners. The flowcharts in FIGS. 4 and 5 show the program flow in the case of a preset scan during a radio broadcast on CP (month 3) and in the case of a preset scan during tape playback. Determines whether the station currently being received is a preset channel or not, and if not,
Step 2) of calling the A channel of RAM 14,
If so, call the next channel.Step 3
). Then, in step 4, it is determined whether or not there is an SD double signal, and if there is an SD double signal, then step 5
The presence or absence of the SD and SK multiplied signals is determined, and if so, a hold time timer is started in step 6, and the operation is continued until the end of the hold time in step 7. When the hold time has expired, the presence or absence of the DK double signal is determined in step 8, and if there is, that state is maintained, and if not, the process moves to step 3 in the same way as in the case where there is no signal in each step 4.5. In Figure 5, in step 11, the state is currently being tuned (although it is not being broadcast because the tape is being played).
It is determined whether or not the station is the Priscella channel. If not, the A channel of the RAM 14 is called up (step 12), and if so, the next channel is called up (step 13). Then, in step 14, it is determined whether the SO double signal is present, and if there is an SD double signal, the presence or absence of the SD and SK double signals is determined in the next step 15, and if there is, in step 16, the D
This state is maintained until the K times signal disappears. If no credit is obtained in each step 14, 15 and 16, the process moves to step 13. [Effects of the Invention] As described in detail above, according to the present invention, while performing a preset scan, it is possible to always search for ARI stations that are conducting information, making the preset scan much easier to use than in the past. One effect is that it can realize the following.

[Brief explanation of drawings]

Fig. 1 is a hob block diagram of an embodiment of the present invention, Fig. 2 is a time table diagram of preset scan during tuner operation, Fig. 3 is a time table diagram of preset scan during tape playback, and Fig. 41! 1 and 5 are flowcharts, and FIG. 6 is a block diagram of a conventional example. 1... Nine-frequency amplifier, 2... Mixer, 3... Local oscillator, 4... IF amplifier, 5... FM detector,
6...Multiplexer, 7...Volume, 8...
・Low frequency amplifier, 9... Speaker, 10... Low pass filter, 11... Microcomputer, 12.
...PL 1 circuit, 13...CP Ll, 14...
・RAM, 15...preset scan switch,
16...Signal, 17...SK decoder, 18...
DK decoder, 19... Selector switch, 20... Equalizer, 21... Magnetic head, 22... API switch, 23... SF') signal.

Claims (1)

[Claims] A cassette car stereo receiver with a built-in receiver that can receive traffic information broadcasts has a preset scan function that constantly scans preset memory stations, and when performing preset scan in traffic information broadcast mode in radio broadcast mode, traffic information broadcast stations Scan the preset station while holding for a predetermined period of time, and only if traffic information is being provided, hold the same station until the information ends, and when preset scanning in traffic information broadcast mode while the cassette tape is being played, traffic information will be displayed. The vehicle is characterized by holding the same station until the end of the information only when the information is being transmitted, and restarting the preset scan after the end, and automatically switching to the traffic information broadcasting mode so as to return to the cassette tape playback state. stereo receiver.