JPS5892121A - Radio receiver for car mounting - Google Patents

Abstract

PURPOSE:To search stations of the same content of broadcast during running of cars, by providing a means for discriminating the content of the same broadcast by detecting several times or more that the moment when sound is interrupted takes place at the same pattern. CONSTITUTION:Data of a station during reception at present is stored in an area 6a of a memory 6. Data of a station to be checked is stored in an area 6b. When a demodulation output detecting circuit 4 detects the intermission of sound, a control section 5 operates a muting circuit 8 and replaces the data in the areas 6a and 6b. Through the data in the area 6a, tuner 2 receives a corresponding station and when the discrimination output from a level discriminating circuit 3 is lower than the level of the station at present stored in the area 6a, the data in the areas 6a, 6b are again replaced. Thus, the stations of the same content can automatically be sought.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an on-vehicle radio receiver that searches for stations with the same broadcast content while the vehicle is running.

With conventional in-vehicle radio receivers, when driving long distances, if you leave the service area of the station you are receiving, the reception signal hJ
In order to worsen the A, I did not have to operate the selectable stations. To save you time, I memorized several laps in advance.
A method has also been proposed in which the station is switched to a station with a good reception level in the memory. However, if such a thing is to be memorized in advance, it is very difficult to memorize the frequency of broadcasting stations with the same broadcast content, which is very time consuming.

The present invention' aims to provide an in-vehicle radio receiver that eliminates such trouble at all, and is capable of detecting gaps in the broadcast content in which the sound is interrupted in the same pattern several times or more. , it is determined that the broadcast content is the same with probability, and automatically finds the same broadcast content without memorizing it in advance, and when the station being received becomes weak, the reception level between the same broadcast content that B has found This is an improvement in that if it is good, you can clearly see it at this station. In this case, there is a possibility that the sound of other broadcasting stations also stops, and this probability is assumed to be 172.

The probability of misjudgment is (-H)" when one continuous detection is made, which is approximately 0.1% or less at 1mm10, and 99.9fI.
This means that it can be determined with a probability of 6.

However, if the test station is not modulating (such as when broadcasting is suspended) or is very quiet, i!
! There were flaws to judge. The present invention has been made to improve this drawback. That is, a 1 judgment was ensured by detecting the voice interruption, seizing the opportunity for the voice to rise again, and checking whether the voice was rising in synchronization with the inspection station. However, since the station switches to another station when the audio starts up, it is necessary to stop the audio only during this switching black period to stop the noise, and if you do this too often, it may interfere with reception. . Therefore, in reality, check the synchronization of audio interruptions several times or more.
If you check the rise of this sound when you can't hear the difference between the content and the content, there will be almost no problem with reception. - A detailed explanation will be given below with reference to drawing C゛ζ. The fH1 diagram is an example of the present invention. Antenna (1)
is connected to the tuner (2), and the received signal is connected to the tuner (2).
supplied to A part of the signal tuned by the tuner (phantom) is given to the level judgment circuit (3). Detected at the level of stages.

This level is supplied to the control section (5).

Further, a part of the demodulated output of the tuner (2) is applied to a demodulation level detection circuit (4). The demodulation output detection circuit (4) detects a pause period in the demodulated audio, for example, if the broadcast content is speech, and supplies this period detection signal to the control unit (5). In addition, part of D[J is supplied to the control unit (6) via a time constant circuit @, but this time constant circuit 01 is designed to prevent false detection of sound rise due to pulse noise etc. It has been inserted.

In addition, the output of the tuner (2) is connected to the muting circuit (8
) to the low frequency amplifier (9) to amplify 8f'
L, given to speaker 0Q.

Now, the data of the station currently being received is stored in the current data memory (
6) is stored in the current data area (6m), this data is given to the tuning voltage generation circuit (7), and the tuner) uses this tuning voltage generation circuit (7).
is tuned based on the output of This tuning voltage generation circuit (7) is constituted by, for example, a PLL frequency synthesizer. In action.

First, the tuning voltage generation circuit (7) generates a tuning voltage based on frequency data in the data area (6th area). Then, the tuner (2) tunes to the current station based on the tuning voltage given from the tuning voltage generating circuit (7) and receives the broadcast program.

The reception signal of the current station received by the tuner (2) is given to a level determination circuit (3), and the demodulated output is given to a demodulated output detection circuit (4).

The output of this level determination circuit (3) is accumulated and averaged by the control section, and then stored as the reception level of the current station. When asked, the output of the demodulation output detection circuit (4) was detected for a certain period of time (for example, this period was about several am to 100 sna), and that voice and pause were detected.

Perform the following sequence of actions.

First, the control part (6)
) is given a t-neeting signal to attenuate the audio output level and interrupt the audio in order to prevent the generation of noise.

Next, the current station data area (
The frequency data stored in 6a) and the inspection station data area (6Th) are swapped, and the frequency data stored in the original inspection station data area (6k) is replaced by the tuning voltage generation enclosure (7). via tuner (2)
given to. The tuner (2) tunes to that frequency and receives the corresponding station 4. Then, the reception level of the inspection station received by the tuner (2) is determined by the level judgment circuit (3).
), and its level is determined. The level signal determined by the level determination circuit (3) is given to the control section (f+J fζ.
5) compares this level with the memorized reception level of the current receiving station, and if the reception level of the current station is higher, it immediately returns to the current station data area (6a) of the current data memory (6). The frequency data stored in the calibration station data area (6b) is replaced with the frequency data stored in the calibration station data area (6b).

The control section (5) has a muting circuit (
Turn off the Otori NEETING signal that was being given to 8) to cancel the audio interruption, and also to
6 frequency data is incremented (or decremented) by the minimum inter-station space.These operations are performed within several meters to several tens of meters.

Since this is the moment when the audio is interrupted, it will not interfere with the reception of the current station's broadcast. Then, when there is a moment when the audio is interrupted again, a repeating signal is given to the muting circuit (8) in the same manner as described above to interrupt the audio and respond to the frequency data of the inspection station data area (6k). receive the station and determine its reception level.

As usual, the frequency data in the inspection station data area (6b) changes from band edge to band edge within the reception band, but at some point, the reception (J level of the inspection station is higher than the reception level of the current station). Let's talk about summer.

At this time, the control section (1) is connected to the demodulation output detection circuit (4).
captures the output and detects whether the audio is interrupted. If the sound does not stop, it is determined that the broadcast program is different, and the system returns to receiving the current station in the same way as if the reception level was low.

Also, at one point, this reception level also exceeded.

If voice and pauses are also detected, turn the control unit (
Even if I return to the current station in May, I will change the frequency data in the inspector data area (6b). The same inspector is then inspected again during the first period of sound and wailing. In this way, if the audio stops at the same time a predetermined number of times, for example six times in a row, the following operation will be performed for the first and sixth time. That is,
In the same way, the sound level is detected by changing to the inspector.
If the inspector also finds that the sound has stopped, he immediately returns to the current station and waits for the time constant circuit (b) and output to rise. At the moment when the output of this time constant circuit (b) rises, the operator changes to the inspector in the same way, detects the output of the demodulation level detection circuit (4), and immediately returns to the current station [cancels NEETING]. At this time, if the voice is rising in the same way, the inspection of this station will continue, but if the inspector's voice is interrupted at this time, it will be determined that broadcast F'[ is different, and the data area of station f will be checked. (6k) is rewritten to the next station. Now, if the inspection is carried out in the same way as the 6th time on the same day, and 1 inspection is continued, the first 8th box will detect audio interruptions, and if the inspector's audio is also interrupted, the control l
&1s (In May, the data stored in the inspection station data area (6h) of the current station memory (6) is swapped with the side of the current station data area. Neating is canceled. In other words, the receiving frequencies are swapped. Therefore, the station automatically switches to a station with the same broadcast content and a higher reception level.In other words, in this example, the rising edge of ! The operation is repeated.As a result, it is possible to keep track of and receive stations with good reception conditions, always with the same broadcast content.

Therefore, when the car moves and enters the service area of another broadcasting station with the same content, the car radio can automatically switch to the frequency of that broadcasting station.

As described above, according to the present invention, if you select a certain broadcasting station, it will automatically switch to a station with the same content and good reception level, so there is no need for any channel selection or memory operations. It is possible to realize an in-vehicle radio receiver without

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of the in-vehicle radio receiver of the present invention. In the figure, (1) is the antenna, (2) is the tuner, (
j) is a level judgment circuit, (4) is a demodulation level detection circuit,
(5) is the control section, (6) is the current data area,
((Ia) is the current station data area, (ah) is the inspection station data area, (7) is the tuning voltage generation circuit,
(8) is a muting circuit, (9) is a low frequency amplifier,
α・ is a speaker, and (b) is a time constant circuit. Agent Makoto Kuzuno

Claims (1)

[Claims] (υMeans that can switch to the receiving state of another station (hereinafter referred to as the inspector) for a very short time while receiving a certain corpse (hereinafter referred to as the current station), a reception level detection circuit, and a demodulated audio level A detection circuit is provided, and when the demodulated output of the current station stagnates for a certain period of time, it switches to the testing station for a short time, and detects that the reception level of the testing station at this time is above a predetermined value and that the demodulated output is It has been detected continuously on several occasions that the demodulated output has stalled in the same way as the current station above, and on at least one of these occasions, the moment the demodulation output that has been stalled rises again, the signal is switched back to the above-mentioned test corpse. Similarly, when it is detected that the demodulated output of the inspection station is rising, the in-vehicle radio receiver determines that the inspection station is a broadcasting station with the same content as the current station. □(2) A patent claim characterized in that the output of the demodulated audio level detection circuit is taken out and interrupted by a certain time constant circuit; and the moment when the demodulated output rises is detected to prevent malfunction due to noise. The in-vehicle radio receiver according to item 1.