JPS60214682A - On-vehicle television receiver - Google Patents

Abstract

PURPOSE:To eliminate troublesome channel switching and to obtain optimum receiving condition in an area during running by switching automatically to channel broadcasting the same content in good receiving condition when previous receiving condition is deteriorated. CONSTITUTION:A main receiver 2 and a sub-receiver 5 are connected to an antenna 1 of an on-vehicle TV receiver that can receive radio waves of VHF and UHF bands and a VHF broadcast receivers 21, 51 and UHF receivers 22, 52 are provided in receivers 2, 5 respectively. It is decided by a same broadcast deciding circuit 6 whether the content of channel broadcast outputted by a video signal outputting device 3 and a sound outputting device 4 received by the receiver 2 and the content of channel broadcast received by the receiver 5 are the same or not, and added to a controlling circuit 7. When receiving condition of the channel being received by the receiver 2 is deteriorated, channel is switched automatically to the channel of the receiver 5 that is in good receiving condition. Thus, troublesome channel switching is eliminated, and optimum receiving condition is obtained in the area in which the car is running.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to an in-vehicle television receiver that is capable of receiving television broadcasts in an optimal reception condition in areas where +44-screen TVs are running.

(b) Conventional technology There are two types of television broadcasting in the frequency band: the VHF band and the River F band.
, 3, 42, 48CH, etc.), and the broadcasting of each channel is hereinafter referred to as channel broadcasting. Currently, depending on the area, the radio wave situation is poor in some areas, and it is impossible to receive TV broadcasts in the VI'(F' band), so the same broadcasts'?i: U HF' Imperial TV broadcasts There are some areas that are able to receive the same content.In some areas, the same content is broadcast on different channels in the same li!it wave number band.

By the way, some vehicles with 1' range can receive television broadcasts, but in such vehicles V)-I
If you are driving while watching F-band TV broadcasts and arrive at an area with poor radio wave conditions, reception may deteriorate and you may not be able to receive satisfactory video and audio. In such cases, TV broadcasts with the same content? 1-U) (If you are in a local area that provides F band, you can receive it by changing the reception band to UHF band and switching to a channel broadcasting the same content, but at that time, the video will be temporarily lost.) It is troublesome to change the f range and channel frequency in itself.
;2 (ifl 'Wf area & U 1 (F Ift ni151 exchange*-i'L) may not be known at all that it is possible to receive UI (F band) that has the same content as TV broadcasts in the VHF band If you do not know whether your area is being broadcasted on TV, you will either switch to another channel with different broadcast content or give up on TV broadcasting.

By the way, in the case of radio IN transmission, in areas where e, L tunpa, and 111 are unpopular, the radio waves sent from the key station (11Q transmission station) are sent to the 111 relay station. The car radio detects the silent periods of the audio signals of the broadcasts from the key station and the middle school 1st station and compares them by 1☆. A car radio subsystem has been proposed that automatically switches the dial if the received broadcast content is the same (Japanese Patent Laid-Open No. 57-206121).
. However, in this case, the silent period of audio number 4 can be detected because it appears frequently when the broadcast content is spoken words such as conversation, but it does not appear for a long time when the broadcast content is music, so this method cannot detect it. It is not possible to determine whether the broadcast contents are the same or not.

Therefore, when considering television broadcasting, there is a fact that television broadcasting includes an F':J vertical synchronization signal, and the phase of this vertical 1u synchronization signal differs from broadcast station to broadcast station.

(c) Purpose of the invention and components Even when the vehicle is driving in an area with poor radio wave conditions, if the reception condition of the channel broadcasting that you are watching becomes poor, it will automatically switch to a channel broadcasting the same content with good reception condition. The purpose is to eliminate the hassle of switching channels and to enable you to watch the channel with the best reception in the area you are flying. A first receiving means receives the channel broadcast, and a second receiving means receives the channel broadcast received by the first receiving means, and a second receiving means receives the broadcast from another channel. an output means for outputting/J broadcasting of one of the channels, and a vertical dome signal included in the channel broadcasting to determine whether the broadcast contents of the channel broadcasts received by the two receiving means (4 means) are the same. and a same broadcast discriminating means which discriminates based on the same broadcast discriminating means, and determines whether the receiving condition of the one channel broadcast which is outputted from the output means is good or bad, and when it is determined that it is not good or bad, i'jit records the broadcast from the broadcast discriminating means. A signal indicating whether or not the contents are the same is input, and when it is determined that the broadcast contents are not the same in each of the broadcast discriminating means described in 111, the output means outputs a signal indicating whether the broadcast contents are the same or not. Outputs a switching signal to switch one channel broadcasting to another channel broadcasting with the same broadcast content as ntJ, and as a result of switching based on the switching signal, the content of the other channel broadcasting is changed to the one channel broadcasting. When the content of the broadcast is the same as that of the broadcast, or when the broadcast determination means in 1111 determines that the broadcast content is the same, the reception state of the other channel broadcast is compared with the reception state of the one channel broadcast, and the When the receiving condition of the other channel broadcast is better, the control means outputs a signal for switching the output of the RIQ output means to the other channel broadcast having the same broadcast content.

) Example The present invention' based on the following drawings? i: Explain.

Figure 1i A car TV receiver according to the present invention 1ni
This is a block diagram of example t, and 1 is VI (F band (/,)
T[Wave TJ HF iit+I (DNIi wave reception antenna, :l:Reception 1N21 (hereinafter referred to as V) that receives television broadcasting in the tVHF band)] F ld transceiver 2
1) and a receiver 22 (hereinafter referred to as the U Tl F broadcast receiver 22) for receiving TV broadcasts of the total number of TV broadcasts. 4-(for video that outputs video based on the video signal included in the channel broadcast of the received TV broadcast)] pupil. 4 is the channel broadcast of the TV broadcast received by the main receiver 2. (sounds included in) 4j signal, an audio output device that outputs all audio based on the 4j signal, and a receiver 51 (hereinafter referred to as U TI F l
ie transmitter/receiver 51) To receive/receive television broadcasting in the F band (4th +(U 52 (+"J
, lower V) IF broadcast receiver (t-t 1 52 and 16) is built-in 11. This is a sub-receiver. Received by 6-digit main receiver 2 and sent to video output device wl 3.1! Voice output device F
The content of the channel broadcast output from 74) and the content of the channel broadcast received by the sub-receiver 5 (,4-5)
(The same broadcast judgment circuit 7 determines whether the transmitted contents are the same or not. The broadcast judgment circuit 7 sends a command signal (described later) to the main receiver 2 and the sub receiver 5), and This is a control circuit that compares the status of the receivers 2 and 5 and detects the reception letter 1 of the main receiver 2 to determine whether it is good or bad.

Next, the operation of the television receiver will be explained based on the flowchart shown in No. 21-A.

Imma, v n F −Hly, 1: (, I HF
4Hy-c Assuming that you are driving in an area where you can receive channel broadcasts with the same content, you can receive TV broadcasts in the VHF band with main receiver 2, and UH with L sub receiver 5.
Let us consider the case (F-1) in which F-band television broadcasting is being received. First, the main receiver 2 receives the V.
Output device i'/3 for TV broadcasting in the II F band
, F-2) If the reception condition of the channel broadcast outputted from 4 is good or bad, the control circuit determines whether it is good or bad.
The HF broadcast receiver 21 continues receiving part 1''!.Meanwhile,
When the reception condition is not good, a command signal for notifying the channel broadcast received by the F broadcast receiver 21 and outputted by the output device 3.4 is sent from the control circuit 7 to the sub reception Ia.
At the same time, a command signal for determining whether the broadcast contents of the television broadcasts received by the receiver 2.5 are the same is output from the control circuit 7 to the same broadcast determination circuit 6. (F-3). Then, based on this command signal, the same broadcast determination circuit 6 determines the broadcast content of the channel broadcast received by the VHF broadcast receiver 21 and output from the output devices @ 3 and 4, and the channel received by the UHF broadcast receiver 51. It is determined whether the broadcast contents of the broadcast are the same or not (F-4), and as a result, when the broadcast contents are the same, a command signal to that effect is sent from the same broadcast determination circuit 6 to the control circuit 7.
is issued and is regulated based on Directive No. 18? 1lIll
At step 7, the receiving state of the V II F broadcast receiver 21 and the receiving state of the UI (F broadcast receiver 51) are compared.
(F-5). Therefore, we installed 4 TJ II F broadcast receivers 5
1 reception state is V)l Ti' broadcast receiver 21
When it is better, the main receiver (i-4+,
A command signal to that effect is output to q2, and the main reception fFi
+ Sub-receive Jli2 reception band and channel (M 4+
The IJTIF broadcast receiver 510 channels of ``IJ TIF broadcast receiver 510'' change to scattering (F-6).In this way, when the reception condition of the main receiver 2 is poor, the reception of the main receiver 2 (
Since the broadcasting area and channel are automatically switched to the channel broadcasting of the sub-receiver 5 which is receiving broadcasts with the same content as the main receiver 2, after that, the
HF broadcast reception 1-21 The V HF that was being received until then
Receive UHF broadcasts on channels with the same content! ! 11i22 can be continuously received.

Meanwhile, in step (F-4), the VHF broadcast receiver 2
When the broadcast content of channel 1 and the broadcast content of channel broadcast of TJ HF broadcast receiver 51 are not the same, a command signal to that effect is output from the same broadcast determination circuit 6 to the control circuit 7, and the command signal is is output to the sub-receiver 5, and based on the command signal, the UHF broadcast is received (broadcast content of channel 510 is output to the VHF broadcast receiver 2).
The channel broadcast of the receiver 51 is changed so that the broadcast content is the same as that of the first channel broadcast (F-7). In addition,
In step (F-5), V HF If! i, the reception state of the transceiver 21 is higher than that of the U ITF broadcast receiver 51
When it is better, a command signal to that effect is output from the control circuit 7 to the sub-receiver 2, and based on that command signal, the UHF
Broadcast reception +! Receive channel A51 broadcast on VHF (better reception than Iku21)
"C Change to another channel broadcasting the same content (F-7).

In addition, (F-2) (F-3) (F-4) (F-5) (F
While step -7) is completed, the channel broadcasting received by the VHF scattering receiver 21 with equal to 17
If the sub-receiver 5 receives the output from t<f3,4, it will be broadcast on a channel with poor reception even if the same content is being broadcast on another channel. The output from

Figure 3 is a detailed block diagram of the in-vehicle Tetobi receiver, with the antenna at 10 and 30il surrounded by a chain line.
Main receiver 30 that receives television broadcasts in the VTIF band and UTI F band; 40 surrounded by chain lines is a sub receiver that can receive television broadcasts in the VHF band and UTI F band. Of these, 31 are a high frequency amplifier that selects and amplifies a desired channel broadcast from the positive waves induced in the antenna 10, and 1 that is used to obtain an intermediate IJ8 wave signal.
A high frequency circuit in which a VT (F high frequency circuit 311 and UHF high frequency circuit 3) 2 consisting of an M wave number converter is built-in;
32 is a video intermediate frequency amplifier that amplifies the video intermediate frequency signal obtained by the frequency converter; 33 is a video detector that extracts the video intermediate frequency signal from the video intermediate frequency signal; and 34 is a video amplifier that amplifies the video detection output signal. Reference numeral 35 includes a synchronization circuit that extracts a synchronization signal from the output of the video detector 33 and separates it into a vertical synchronization signal and a horizontal synchronization signal, and a synchronization circuit that controls horizontal and vertical oscillators (not shown) using the synchronization signal. This is a synchronization/scanning device that generates a wave signal and includes a deflection coil (not shown) of a cathode ray tube (not shown), which is the image output device 50, and a scanning device that deflects an electron beam.

36 is an audio intermediate frequency amplifier that amplifies the audio intermediate frequency signal obtained by the high frequency circuit 310 frequency converter; 37;
An audio detector detects the FM modulated wave signal from the audio intermediate frequency amplifier 36 to obtain an audio signal, and an audio amplifier 38 amplifies the audio signal obtained by the FM detection to drive the speaker 53. 54 is a video intermediate frequency amplifier 32 for controlling the reception state of the main receiver 30 by 117J.
This is a main-side receiving state detector connected to the main receiving state detector, and specifically, it detects the level, distortion, etc. of the video intermediate IM wave signal. ” J-build receiver 8 (consisting of 41 out of 40 high-frequency amplifiers)
A high frequency circuit 412 for 1/= tr Tl p' is built in, and a high IF wave circuit 42 is a video intermediate circuit 1. Cut wave multiplier, 43V, 1 video detector,
44 is a synchronization signal detector that detects vertical synchronization signal C4 from the video signal obtained by the video detector 43. a sub-side receiving state detector 56 connected to the video intermediate frequency amplifier 42 to check the receiving state of the sub-receiver 40;
Is it the main reception I? This is a synchronization signal comparator to check whether the received broadcast contents of A30 and sub receiver 40 are the same. It detects the phase difference of the vertical synchronization signal included in the vertical synchronization signal included in the main receiver 30 based on the output from the reception state detector 57. This is a control device that compares and determines whether the reception conditions of the main and sub sides are good or bad based on the output from the main side, or outputs a command signal to the high frequency circuits 31 and 41 to force the channel to be eliminated.

Next, among the operations of the above television receiver, the main receiver I 3
Only the operation (step (F-4) in the second step) of determining whether the broadcast contents of the channel broadcasts received by the sub-receiver 40 and the sub-receiver 40 are the same will be described.

In general, if the receiving broadcasting stations are different, the phase of the vertical synchronization signal included in the television signal from each broadcasting station will be different, so by detecting this phase shift, that is, the phase difference, it is possible to determine whether the receiving broadcasting stations are the same or not. It can be determined whether the broadcast contents of the received channel broadcasts are the same. Therefore, in this embodiment, in order to determine whether the broadcast content of the channel broadcast received by the main receiver 30 and the broadcast content of the channel broadcast received by the sub receiver 40 are the same, the main receiver 30 Synchronization/scanning device 1135 and sub receiver 4
The phase difference between the vertical synchronizing signals from the synchronizing signal detector 44 of 0 is detected. That is, in response to a command signal from the control device 57 to determine whether the broadcast contents of the channel broadcasts received by the main receiver 30 and the four sub-receivers 40 are the same, , the synchronization signal comparator 56 determines whether the phase difference between the vertical synchronization signals separated by the main reception 1130 and the sub reception tIIA 40 is greater than or equal to a predetermined value (for example, 10% of the period π of the vertical synchronization signal). However, if it is equal to or greater than a predetermined value, it is determined that the receiving broadcasting stations, that is, the broadcast contents are different, and conversely, if it is within the one-time period, it is determined that the broadcast contents are the same.

With this configuration, if the reception card on the main receiver of the channel broadcast that is being output is bad, the control device can be used. a
Since Node 7J automatically switches to Node 7J from other channels broadcasting the same content with good reception on the sub-tg receiver, it is possible to use Node 7J in areas with poor radio wave conditions while the vehicle is driving. There is no need to manually change the channel according to the reception status when the main receiver is connected, and there is no need to worry about the video being cut off during the switching operation, and you can receive broadcasts of the same content as the channel broadcasts being received by the main receiver. All conversations and music can be received reliably. In addition, if you do not know that you can receive signals by switching to the EUHF reception band at a point where the reception condition has deteriorated, or if you are at a point where the reception condition has deteriorated, you can use the UI (F band television broadcast Even if you don't know if you live in an area where this service is available, you can conveniently receive the same content as VHF TV broadcasts on UHF channel broadcasts.

In addition, the main reception is done with the above-mentioned in-vehicle TV receiver! l
2 receives UHF band television broadcasting, and sub-receiver 5 receives V.
When receiving TV broadcasts in the HF band, if the reception condition of the main receiver 2 becomes poor, the channel broadcast output from the output device 3.4 will broadcast the same content received by the sub receiver 5. The output will be automatically changed to the broadcasting channel that has good reception.

In this embodiment, when the reception signal 111 of the channel broadcasting that is currently outputting video and audio becomes poor, another channel broadcasting the same content and with good reception is transferred to the frequency band (LLF'). .

(UHF) (if the channel broadcast being output is in the VHF band, the TI F band, UTI F band
'1 VHF band) TV broadcasting, but if there is another channel broadcasting with good reception in the same frequency band, the output may be switched to that channel broadcasting. Further, a microcomputer may be used as the control device. Also, you can use the vehicle's TV receiver to
, (2) There are many devices that allow only the sound of television broadcasts to be heard, and if the present invention is applied to such vehicle television receivers, it is possible to reliably hear the music dissipated.

In addition, in this embodiment, a sub-receiver is provided in the (IIL) of the main receiver, but the sub-receiver is not provided and the VI (reception of the TV broadcast receiver of the F band and U HF band) built in the main receiver is used. The channel may be changed by comparing the waves.

(E) Effects of the Invention As explained above, the present invention provides a first receiving means for receiving a predetermined channel broadcast of television broadcasts;
The channel broadcast received by the receiving means includes: a second receiving means that receives another channel broadcast; an output means that outputs one of the channel broadcasts received by the two receiving means; same broadcast determining means for determining whether the broadcast contents of the channel broadcasts received by the receiving means are the same based on a vertical synchronization signal included in the channel broadcasts, and one channel broadcast outputted from the output means. It is determined whether the reception condition is good or bad, and when it is determined that the receiving condition is not good, a signal indicating whether or not the broadcast contents are the same is manually transmitted from the same broadcast determining means, and when the broadcast contents are determined to be not the same by the same broadcast determining means. In this case, the output means outputs a signal for switching the broadcasting of another channel that is not outputted to the broadcasting of another channel that has the same broadcast content as the broadcasting of the one channel, and as a result of switching based on the switching signal, the broadcasting of the other channel is The broadcast content of the channel broadcast is
(iif) When the broadcast content is the same as that of one channel; (1) When the broadcast discriminating means determines that the broadcast content is the same, (e) When the reception condition of the other channel broadcast is better than the reception condition of the channel broadcast, a signal is sent to switch the output from the output means to the other channel broadcast having the same broadcast content. This is an h'q configuration having a control means for outputting. In this way, when the vehicle enters an area with poor radio wave conditions while driving, it eliminates the hassle of having to manually switch the reception band or channel broadcast depending on the reception area, and the video is temporarily interrupted during the switching operation. Channel broadcasting 2 with optimal reception conditions in the area where you are driving without being lost at t1
You can see it.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the in-vehicle television receiver according to the present invention, FIG. 2 is a flowchart for explaining the operation of the television receiver according to the present invention, and FIG. 3 is the same as shown in FIG. 1. FIG. 2 is a detailed block diagram of a television receiver. 1.10...Antenna, 2.30...Main receiver, 3.50...Video output device, 4...Audio output device, 5.40...Sub receiver, 6... Same broadcast determination circuit, 7... control circuit, 31.41... high frequency circuit,
32゜42...Video intermediate 1 waver, 33, 43'.
...Video detector, 34...Video amplifier, 35...Synchronization/scanning device, 36...Audio intermediate frequency amplifier, 37
...Audio detector, 38...Audio amplifier, 53...
Speaker, 54... Main side reception status detector, 55.
-Sub-side reception status detector, 56...Synchronization signal comparator, 57...Control device patent applicant Hiroo Tsuchi Suzuki, Patent Attorney, Nissan Motor Co., Ltd.

Claims (1)

[Claims] A first channel for receiving a predetermined channel broadcast among television broadcasts.
The receiving means and the channel broadcast received by the first receiving means are replaced by the second receiving means which receives another channel broadcast, and the channel broadcast which is not received by the two receiving means. an output means for outputting an output; an identical broadcast determination means for determining whether the contents of the channel broadcasts received by the two receiving means are the same based on a vertical synchronization signal included in the channel broadcast; and the output means. A judgment is made as to whether the reception condition of one channel broadcast outputted from the channel is good or bad, and when it is judged as bad, a signal indicating whether or not the broadcast contents are the same is manually sent from the same broadcast discrimination means, and the same broadcast is received. When the determining means determines that the broadcast contents are not the same, a switching signal for switching the other channel broadcast which is not outputted from the output means to the first channel broadcast having the same broadcast contents as the one channel broadcast; Output 1/JL, based on the iil note till exchange signal! XI
&! When the broadcast content of the channel broadcast is the same as the one channel broadcast in 1111, the broadcast discriminating means determines that the broadcast content is the same. q) When broadcasting on the other channel, check the reception status of the one channel rI.
1.4) If the condition of the other channel broadcast (i4 condition σ) is better than that of the other channel broadcast, the output from the output means is sent to the same broadcast content. 1. A vehicle-mounted television receiver FR1, characterized in that it has a control means for outputting a signal for switching to the other channel broadcast.