JP3531538B2 - TV receiver - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver capable of receiving a plurality of types of television broadcasts in which the broadcast system and the frequency allocation of broadcast channels are individually set.

[0002]

2. Description of the Related Art Conventionally, in television broadcasting, standards for video signals such as horizontal synchronizing signals and the number of vertical scanning lines, frequency of audio carrier (frequency difference with respect to video carrier) and modulation method (A
Various standards such as audio signal standards of M modulation, FM modulation, etc. have been established, and as a broadcasting system in which these television broadcasting standards are summarized, the number of scanning lines, field frequency, channel bandwidth, upper and lower side waves Bandwidth, video modulation method, audio carrier frequency, audio modulation method, etc. B method, G method,
Standard broadcasting systems such as H system, I system, D system, K system, L system, and M system, and NTSC system, PAL system, SECA
Color systems such as the M system are known. As for these broadcasting systems, different systems are adopted for each country or region.

In addition, in each broadcasting system, the bandwidth (channel bandwidth) of one channel of the broadcast signal and the position (frequency) of the video carrier and the audio carrier within the band are defined, but the broadcasting is actually performed. At this time, a broadcast frequency is further allocated to each broadcast channel, and the frequency allocation for each broadcast channel is different for each country or region.

Therefore, in order to receive a television broadcast in a plurality of countries or regions having different broadcasting systems or frequency allocations of broadcast channels, the type of television broadcasting adopted in each country or region (specifically, the broadcasting system and A television receiver that supports each broadcast channel's frequency allocation) is required, and in particular, residents of areas where various broadcast waves of different types of TV broadcasting reach, or mobile units in multiple countries or areas of different types of TV broadcasting are required. There has been a demand for a television receiver compatible with various television broadcasts among travelers who travel by (automobile, railroad, ship, etc.).

On the other hand, conventionally, as a navigation device, an external television tuner (television receiving device) receives a video signal of each system of NTSC, PAL, and SECAM set for each country, and receives a television broadcast image of each system. Video signal (composite signal) for displaying the video signal from the TV tuner in order to display on the display device.
It is proposed that the conversion method when converting to is automatically switched according to the current location detected using a GPS receiving device or the like (in other words, according to the video signal method set for each country). (Japanese Patent Laid-Open No. 7-105409).

[0006]

However, the device of this proposal automatically converts the video signal input from the TV tuner into the display video signal when outputting the display video signal to the display device. As a TV tuner that receives and demodulates a broadcast signal and inputs a video signal, a plurality of TV receivers capable of receiving different TV broadcasts in different countries or regions are required. Can't answer.

On the other hand, since the proposed technique switches the video signal conversion system according to the present location,
By applying this technique to a television receiver, it is possible to demodulate video signals of different systems in the television receiver.

That is, in the television receiver, frequency allocation for each broadcast channel necessary for selecting (converting to an intermediate frequency) a broadcast signal of a desired broadcast channel,
By changing the demodulation method when demodulating the video signal from the intermediate frequency signal (broadcast signal after frequency conversion) of the desired broadcasting channel obtained by the channel selection according to the current location, the broadcasting system and the broadcasting channel It is possible to receive a plurality of television broadcasts having different frequency allocations and demodulate the video signal of the desired broadcast channel.

However, even if a television receiving apparatus capable of demodulating a video signal of a broadcasting system different in each country or region is developed by adopting the above-described technique in the television receiving apparatus, the demodulating apparatus can be used in the apparatus. Although it is possible to reproduce the television broadcast image based on the video signal, the problem occurs that the audio signal cannot be normally received and demodulated, and the audio cannot be reproduced.

That is, the broadcasting system of television broadcasting set for each country or region is different not only in the standard of the video signal but also in the standard of the audio signal (frequency of the audio carrier wave and modulation system of the audio signal). Among the standards of the audio signal, the frequency of the audio carrier (difference in frequency of the audio carrier with respect to the video carrier; audio carrier-video carrier) is +4.5 MHz, +5.5 MHz, +6 MHz, +.
There are various standards such as 6.5 MHz, and even if voice modulation signals with different frequencies are input to the demodulation circuit for voice demodulation, the demodulation circuit side demodulates only the voice modulation signal in a specific frequency band. Therefore, it becomes impossible to normally receive and demodulate the audio signal.

The present invention has been made in view of the above problems, and is capable of receiving a plurality of types of television broadcasts in which the broadcasting system and the frequency allocation of broadcast channels are individually set, and moreover, each television broadcast is desired. An object of the present invention is to provide a television receiver capable of reliably demodulating a video signal and an audio signal of a broadcast channel.

[0012]

According to another aspect of the present invention, there is provided a television receiving apparatus according to claim 1, wherein the tuning control means selects a type and a broadcasting channel of television broadcasting to be received from the outside. When the station command is received, the control data of the television broadcast and the broadcast channel corresponding to the channel selection command are read from the control data storage unit, and the channel selection unit and the frequency conversion unit are controlled according to the control data.

Therefore, the channel selection means frequency-converts the broadcast signal of the specific broadcast channel of the specific television broadcast corresponding to the channel selection command so that the broadcast signal becomes the first intermediate frequency signal for video demodulation,
The frequency conversion means converts the frequency-converted broadcast signal into
The audio modulation signal included in the broadcast signal is frequency-converted so as to become the second intermediate frequency signal for audio demodulation, and the video demodulation means and the audio demodulation means provide the broadcast signal and the audio demodulation signal of the specific broadcast channel. However, they are always input at a constant frequency as the first intermediate frequency signal and the second intermediate frequency signal, respectively.

Therefore, according to the television receiver of the present invention, not only the frequency allocation of the broadcast channel but also the frequency standard of the audio signal (specifically, the deviation of the audio carrier from the video carrier) varies depending on the broadcasting system. It becomes possible to receive a plurality of TV broadcasts and demodulate video signals and audio signals respectively, and output the demodulated video signals and audio signals to an external monitor (display device) or speaker to select a channel. The video and audio of the specific broadcast channel selected by the means can be received respectively.

Therefore, the television receiving apparatus of the present invention can receive a plurality of types of television broadcasts in which the broadcasting system and the frequency allocation of the broadcasting channel are individually set, and the frequency allocation of the broadcasting system and the broadcasting channel is carried out. Residents in areas where multiple types of broadcast waves reach different areas, or mobiles (vehicles, vehicles) in multiple countries or areas with different types of television broadcasting (broadcasting system and frequency allocation of broadcast channels)
For a traveler traveling by train, ship, etc., various television broadcasts can be listened to by one television receiving device, which is a very convenient television receiving device.

By the way, as described above, in the broadcasting system of television broadcasting, not only those having different frequency characteristics of the audio signal (difference in frequency of the audio carrier with respect to the video carrier) but also NTSC, PAL, SECAM, etc. There are various broadcasting systems such as different color systems of video signals and different modulation systems of audio signals such as FM modulation and AM modulation.

Further, in particular, in the television receiving apparatus according to the first aspect, the broadcast signal selected by the channel selecting means is frequency-converted so that the audio modulated signal becomes the preset second intermediate frequency. , It is possible to receive a television broadcast of a plurality of broadcasting systems having different frequency characteristics of an audio signal, select a broadcast signal of a desired broadcast channel among them, and demodulate a video signal and an audio signal respectively. If the video demodulating means can demodulate only a video signal of a specific color system, or if the audio demodulating means can demodulate only an audio signal of a specific modulation system, the area where the television receiver can be used is limited.

Therefore, in order to enable the television receiver to receive television broadcasts in which not only the frequency characteristics of the audio signal but also the color system of the video signal are received, the method of claim 2
As described above, the video demodulation means is configured to be able to demodulate a plurality of video signals of different standards (color system etc.), and the channel selection control means side receives the channel selection command when it receives the channel selection command. The demodulation operation of the video demodulation means may be set so as to demodulate the video signal of the standard adopted in the television broadcasting corresponding to the command.

In order to enable the television receiver to receive a television broadcast having a different modulation method as well as the frequency characteristic of the audio signal, the audio demodulating means is modulated as described in claim 3. A plurality of audio signals of different systems can be demodulated respectively, and when the tuning control means receives a tuning command, the audio signal of the modulation system used in television broadcasting corresponding to the tuning command. It is preferable to set the demodulation operation of the voice demodulation means so as to demodulate.

That is, if the television receiver is configured as described in claim 2, even if the color system of the broadcast signal of the specific broadcast channel selected by the channel selection means is different, the video demodulation means. In the above, it becomes possible to demodulate the video signals of the respective systems, and when the television receiving device is configured as described in claim 3, the audio frequency-converted into the second intermediate frequency by the frequency converting means. Even if the modulation method of the carrier wave is different, the audio demodulation means can demodulate the audio signal from the audio modulation signal modulated by each method.

When the video demodulating means is adapted to demodulate the video signal of each system, if the display device as the output destination of this video signal does not support the video signal of each system, the demodulated system The TV broadcast image cannot be reproduced based on the video signal. Therefore, when the receiving device connected to the television receiving device of the present invention (particularly claim 2) cannot reproduce the video signals of a plurality of systems adopted in each television broadcast, the television receiving device is further It is advisable to provide video conversion means for converting the video signal from the video demodulation means into a video signal of a specific system that can be reproduced by the display device.

Further, in this case, in order to make the type of the output video signal correspond to the various display devices, the video conversion means uses the video signal input from the video demodulation means as a video of a specific system selected from a plurality of systems. It may be configured so that it can be converted into a signal and output, and the system of the video signal output by the video conversion means can be arbitrarily set by an external operation or a command from the display device side.

In the case where the television receiving device is provided with the video converting means as described above, the video signal output by the video converting means may be any video signal capable of reproducing an image on the display device. Instead of the video signals of the above-mentioned color systems used, for example, a video signal or the like for R, G, and B dedicated to a display device can be used. It is possible to expand the types of display devices that can be connected to.

By the way, in the television receiver of the present invention , when the user inputs a channel selection command for a desired broadcast channel, a broadcast signal of a specific broadcast channel corresponding to the channel selection command is automatically selected and the broadcast is performed. Video and audio signals will be demodulated from the signal, but in areas where the broadcast waves of the specific broadcast channel specified by the tuning instruction do not reach, the video and audio signals of that broadcast channel will not be demodulated. .

Therefore, in order to ensure that the television receiver receives the broadcast signal, it is necessary to determine what television broadcast the user can actually receive out of the television broadcasts that the television receiver can receive. It is necessary to grasp the information, select a television broadcast to be viewed from the receivable television broadcasts, and input a tuning instruction representing the broadcast channel of the television broadcast. In order to select a receivable TV broadcast, if the TV receiver cannot search for a receivable TV broadcast at the current location, the user can actually use the receiver with a local magazine or newspaper. It is difficult to use because you have to find out which TV broadcasts you can receive.

Therefore, in the present invention (claim 1), the television
In order to further improve the usability of the receiving device, the television receiving device is provided with a search function for automatically searching currently available television broadcasts and broadcasting channels, and the user can input a tuning command based on the search result. I'm trying
It

That is, in the television receiver according to the first aspect , when the search channel selection command output means receives a search command for a receivable broadcast from the outside, the channel selection control means receives the received channel by the device. A channel selection command corresponding to all possible broadcast channels of each television broadcast is sequentially output for each broadcast channel. Then, the reception state determination means causes the video demodulation means and the audio demodulation means to generate the video signal and the audio signal of the specific broadcasting channel corresponding to the selection command each time the search selection command output means outputs the selection command. It is determined whether or not has been demodulated. When the reception state determining means determines that the video signal and the audio signal of the specific broadcast channel can be demodulated, the receivable broadcast storing means outputs the selection signal output by the search channel selection command output means at that time. The television broadcast and the broadcast channel corresponding to the station command are stored in the receivable broadcast storage means as broadcasts that can be actually received by the device at present, and the notification means is receivable stored in the receivable broadcast storage means. Inform the user of the broadcast.

Therefore, according to the television receiver of the present invention (Claim 1) , not only can a plurality of television broadcasts be received and the video signal and the audio signal of the desired broadcast channel can be demodulated, It is possible to automatically search for a TV broadcast that can actually be received and notify the user, and the user can know the TV broadcast that the TV receiver can currently receive from the notification result.

On the other hand, as described above, whether or not the video signal and the audio signal can be demodulated is determined for each broadcast channel of all television broadcasts that can be received by the device, and the determination result is notified to the user. This causes a problem that it takes more time to search for receivable broadcasts as the number of types of television broadcasts to be received and the number of broadcast channels of the television broadcasts increase.

Therefore, in the television receiver of the present invention,
Is a current location detecting means for detecting a current location, and area information storing means for storing area information indicating an area where a broadcast radio wave of each television broadcast to be received reaches for each television broadcast. When the search tuning command output means receives the search command from the outside and outputs the tuning command to the tuning control means, the current location detected by the current location detection means and the area information storage means are stored. It is also possible to specify a television broadcast whose broadcast radio wave reaches the current location based on the area information thus obtained and output a tuning instruction corresponding to each broadcast channel of the identified one or a plurality of television broadcasts.

That is, according to the television receiver of the fourth aspect , the search channel selection command output means specifies the television broadcast whose broadcast radio wave reaches the current location in searching the currently receivable television broadcast, Since the channel selection command is output for each broadcast channel of the specified TV broadcast,
Reduce the number of broadcast channels that output tuning instructions,
The time required to search for receivable broadcasts can be shortened.

Next, according to the television receiver of the present invention (claims 1 to 4) , it is possible to receive television broadcasts having different broadcast systems and frequency allocations of broadcast channels.
As described in claim 5, a mobile body (a car, a railroad, a ship, etc.) that moves in a country or region in which the type of television broadcasting is different.
If it is configured as a mobile-device television receiver mounted in, the effect can be exhibited more effectively. Special
In addition, does the television receiver of the present invention (claims 1 to 4) have a search function for automatically searching for receivable broadcasts ?
Et al., If mounted on a mobile, it especially makes it possible to automatically search a receivable broadcast which changes according to the movement of the movable body
Therefore , the usability can be improved.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a television receiver 10 and its peripheral devices according to an embodiment of the present invention.

The television receiver 10 of this embodiment is adapted to receive a plurality of types of television broadcasts having different broadcast systems and frequency allocations of broadcast channels and to demodulate video signals and audio signals of desired broadcast channels. is there. Therefore, in the television receiver 10, as shown in FIG.
Receiving antenna 2 that can receive broadcasting waves of various television broadcasts, the user inputs a command to select a specific broadcast channel, or a search command for a broadcast that can actually be received (hereinafter referred to as a receivable broadcast). For this purpose, an operation unit 4, a display device 6 that receives a video signal from the television receiving device 10 to display an image, and a speaker 8 that receives an audio signal from the television receiving device 10 and emits a sound are connected.

The television broadcast signal received by the receiving antenna 2 is input to the television receiver 10 as a received signal, and the received signal is received by the tuner section 12 at the tuner section 12.
By being input to the mixer 12b together with the local oscillation signal (hereinafter, referred to as a local oscillation signal) of the frequency f1 generated by the frequency variable oscillator (hereinafter, simply referred to as an oscillator) 12a, the mixer 12b converts the received signal into a reception signal. Frequency conversion is performed so that the broadcast signal of the specific broadcast channel in the included specific television broadcast becomes the first intermediate frequency signal.

In the tuner section 12, the mixer 12b
The frequency-converted reception signal is input to the bandpass filter (BPF) 12c, and the broadcast signal for the specific broadcast channel converted to the first intermediate frequency signal is extracted. Then, the broadcast signal is further divided into two by a distribution circuit 12d, and one of the broadcast signals is demodulated as a video intermediate frequency signal PIF for video demodulation via a bandpass filter (BPF) 12e. The other broadcast signal output to the unit 14 is a bandpass filter (BPF).
Audio intermediate frequency signal SIF for audio demodulation via 12f
1 is output to the frequency conversion unit 22.

The tuner section 12 corresponds to the channel selecting means of the present invention, and the oscillation frequency f1 of the oscillator 12a is controlled by a control signal CF1 from a microcomputer (hereinafter, referred to as a microcomputer) 30 described later. To be done.
Next, the video demodulation section 14 corresponds to the video demodulation means of the present invention (particularly claim 2), and the tuner section 1 is converted from the video intermediate frequency signal PIF input from the tuner section 12.
The video signal of the specific broadcast channel selected in 2 is demodulated.

The video demodulation unit 14 uses the standards such as the number of scanning lines, the field frequency, the video modulation system, and NTSC.
It is configured to demodulate video signals from various broadcasting signals of different color systems such as H.264, PAL and SECAM systems. As shown in the figure, demodulation circuits (in the figure The first demodulation circuit 14a, the second demodulation circuit 14b, and the third demodulation circuit 14c corresponding to the color system are provided).

Then, the video demodulation section 14 is provided with the microcomputer 30.
According to the control signal CDV from, the demodulation circuit used for demodulating the video signal is switched to perform the demodulation operation corresponding to the modulation system or the color system of the video signal.
The video signal is demodulated from the video intermediate frequency signal PIF input from the terminal 2.

Next, the video signal demodulated by the video demodulation unit 14 is converted into the video signal conversion unit 16 as the above-mentioned video conversion means.
Then, after the display device 6 connected to the device 10 is converted into a display video signal of a predetermined system capable of reproducing a television broadcast image, it is output to the external display device 6 via the video output switching unit 18. To be done.

The video signal conversion unit 16 and the video output switching unit 18 respectively have control signals CV1 and CV1 from the microcomputer 30, respectively.
The video signal conversion unit 16 operates according to CV2.
Converts the video signal from the video demodulation unit 14 into a display video signal of a system corresponding to the control signal CV1 from the microcomputer 30, and the video output switching unit 18 converts the display video signal to be output to the display device 6. The display video signal from the video signal converter 16 or the message display video signal output from the microcomputer 30 is switched.

The video signal demodulated by the video demodulation unit 14 is input to the synchronization detection unit 20 which detects the presence / absence of the synchronization signal. Then, the synchronization detection unit 20 to the microcomputer 30
A detection signal SVI indicating the presence / absence of a synchronization signal is output to. On the other hand, the frequency conversion unit 22 corresponds to the frequency conversion unit of the present invention, and mixes the audio intermediate frequency signal SIF1 input from the tuner unit 12 with the local oscillation signal of the frequency f2 generated by the oscillator 22a. The audio intermediate frequency signal SIF1 is further input by inputting to the device 22b.
Second intermediate frequency signal SIF in which the sound carrier has a constant frequency
Convert frequency to 2.

The oscillator 22a is a variable frequency oscillator capable of controlling the oscillation frequency f2, like the oscillator 12a of the tuner section 12, and the oscillation frequency f2 is the microcomputer 3
It is controlled by a control signal Cf2 from 0. Then, the second intermediate frequency signal SIF 2 for audio demodulation that has been frequency-converted by the frequency conversion unit 22 is input to the audio demodulation unit 24.

Next, the audio demodulation unit 24 corresponds to the audio demodulation means of the present invention (particularly claim 3), and the tuner unit 12 receives the second intermediate frequency signal SIF2 input from the frequency conversion unit 22. The audio signal of the specific broadcast channel selected in is demodulated. Further, the audio demodulation unit 24 can switch the demodulation operation according to the modulation system of the audio signal so that the FM demodulation circuit 24a and the AM demodulation circuit 24b can be switched.
And two types of demodulation circuits.

Then, the voice demodulating section 24 uses the microcomputer 30.
By switching the demodulation circuit used for demodulating the audio signal in accordance with the control signal CDA from the second intermediate frequency signal SIF2 in which the audio carrier wave input through the tuner unit 12 and the frequency conversion unit 22 has a constant frequency, The demodulation operation corresponding to the modulation system of the audio signal is performed to demodulate the audio signal.

The audio signal demodulated by the audio demodulation unit 24 is passed through the audio output switching unit 26 to the external speaker 8
And is input to the voice detection unit 28. Then, the audio output switching unit 26 adjusts the level of the audio signal from the audio demodulation unit 24 (the volume of the audio reproduced by the speaker 8) or outputs the audio signal to the speaker 8 according to the control signal CAU from the microcomputer 30. The voice demodulator 24
The audio signal demodulated in step 1 or the audio signal for notifying the audio message output from the microcomputer 30 side is switched. Further, the voice detection unit 28 uses the second intermediate frequency signal SI.
The presence / absence of an audio signal is detected from the audio carrier signal level of F2, and the audio detector 28 outputs a detection signal SAU indicating the presence / absence of an audio signal to the microcomputer 30.

On the other hand, the microcomputer 30 receives the channel selection command or the search command input from the operation unit 4, and receives the tuner unit 1
2 and the oscillation frequencies f1 and f2 of the oscillators 12a and 22b in the frequency conversion unit 22 are controlled respectively, so that the tuner unit 12 and the frequency conversion unit 22 can receive the broadcast signal of the specific broadcast channel of the specific TV broadcast. The tuner section 12 is caused to perform frequency conversion of the audio modulation signal of the selected and selected broadcast channel to a specific frequency, and further, the tuner section 12 is caused to select the demodulation operation of each of the video and audio demodulation sections 14 and 24. The demodulation units 14 and 24 execute control to demodulate the video signal and the audio signal in accordance with the broadcasting system of the video signal and the audio signal of the specific broadcast channel.
The U30a, the ROM 30b, the RAM 30c and the like are mainly configured.

In the ROM 30b of the microcomputer 30, in addition to a control program for causing the CPU 30a to execute such control, control data for tuning and demodulation necessary for the CPU 30a to execute control according to the control program ( Channel selection data and demodulation data) are stored in advance. The ROM 30b functions as the control data storage means of the present invention.

Of the control data stored in the ROM 30b, the tuning data is sent to the tuner section 12 and the frequency conversion section 22 by broadcasting the broadcast signal and audio modulation signal of the desired broadcast channel to the demodulation sections 14 described above. , 24 are for converting an input signal into a signal of a predetermined frequency band (video intermediate frequency signal PIF and second intermediate frequency signal SIF2) capable of respectively demodulating a video signal and an audio signal. Specifically, FIG. As illustrated in 2 (a), Country A broadcasting, Country B broadcasting,
As described above, the oscillation frequencies f1 and f2 of the oscillators 12a and 22a for channel selection and frequency conversion corresponding to each broadcast channel are stored for each type of television broadcast that the device 10 receives.

The data shown in FIG. 2A is for terrestrial television broadcasting in Japan,
Necessary to operate the tuner unit 12 so that the video carrier of each broadcast channel (CH1 to CH62) becomes 58.75 MHz and operate the frequency conversion unit 22 so that the sound carrier of each broadcast channel becomes 10.7 MHz. 3 shows an example of the oscillation frequencies f1 and f2 of the respective oscillators 12a and 22a.

The demodulated data stored in the ROM 30b is the broadcasting system of the video and audio signals of the specific broadcast channel selected by the tuner 12 for the demodulation operations of the video and audio demodulation units 14 and 24. For example, as shown in FIG. 2B, the number of scanning lines, the field frequency, the color system, etc. are set for each type of television broadcast that the device 10 receives. The broadcast system of the video signal and the modulation system of the audio signal are stored.

Next, in FIG. 3, when the user operates the operation unit 4 to input a search command for the currently receivable television broadcast to the television receiver 10, the CPU 30 of the microcomputer 30 is instructed. It is a flowchart showing the receivable broadcast search process executed by

As shown in FIG. 3, when this process is started, in S110 (S represents a step), the apparatus 1
A search target broadcast type acceptance process for accepting the type of TV broadcast for which receivable broadcasts should be searched out of all the TV broadcasts for which 0 is the reception target is executed. Since this processing takes time if the subsequent search processing is performed for all broadcast channels of all the television broadcasts that the television receiving apparatus 10 receives, the type of television broadcast to be searched for in the subsequent search processing is used. This is a process for the user to input, for example, a list of all TV broadcasts to be received (specifically,
By generating image data representing a list of broadcast types including country names, place names, etc. such as A country broadcasting, D area broadcasting, etc., and outputting the image data to the video output switching unit 18, the video output switching unit 1
8 causes the display device 6 to output a video signal for display corresponding to the image data, displays a list of all receivable television broadcasts on the display device 6, and the user operates the operation unit 4 according to the display screen. It is executed in such a procedure as to accept the type of the television broadcast specified through.

In S110, if the user inputs a search command for all TV broadcasts, or if the type of TV broadcast to be searched for is not specified within a predetermined time, the device 10 is targeted for reception. All TV broadcasts that have been set are set as search targets. When the type of the television broadcast to be searched for the receivable broadcast is set by the process of S110, the type number (1, 2, 3 ...) Is given to each of the set television broadcasts in S120, and then, An initial value "1" is set as the type number n of the television broadcast to be searched.
Further, in subsequent S130, an initial value "1" is set to the channel number (CH number) m representing the broadcast channel to be actually selected in the television broadcast of the type number n.

The display format of the actual broadcast channel is
It is set for each country or region (in other words, for each type of television broadcasting), and in addition to numbers that are simply assigned from "1", letters that are assigned alphabets such as "A", "B" .... There are various display formats, such as those excluding a specific number, but here, it is assumed that all numbers are given in order from "1".

Then, in the following S140, the demodulation data for the television broadcast (n broadcast) adopted in the specific country or region corresponding to the currently set type number n is read from the ROM 30b, and in the following S150, The demodulation operations of the video demodulation unit 14 and the audio demodulation unit 24 are set according to the demodulation data.

Further, in S160, the tuning data of the broadcasting channel (mCH) corresponding to the currently set CH number m is read from the ROM 30b, and in the subsequent S170, the tuner unit 12 and the frequency converter are converted according to the tuning data. Oscillation frequency f of each oscillator 12a, 22b in the section 22
1 and f2 are set. The processes of S140 to S170 correspond to the tuning control means of the present invention.

As a result, the tuner section 12 and the video demodulation section 1
4, the frequency conversion unit 22 and the voice demodulation unit 24, respectively,
Of the television broadcasts corresponding to the type number n, the broadcast signal of a specific broadcast channel corresponding to the CH number m is selected, and the video signal and the audio signal are demodulated from the selected broadcast signal.

Therefore, in the following S180, it is determined whether or not the video signal is actually demodulated by the video demodulation unit 14 based on the detection signal SVI from the synchronization detection unit 20, and if the video signal is demodulated. In subsequent S190, it is determined based on the detection signal SAU from the voice detection unit 28 whether the voice demodulation unit 24 has actually demodulated the voice signal.

If it is determined in S190 that the audio signal is demodulated (in other words, if both the video and audio signals can be demodulated), the broadcast currently selected by the tuner unit 12 is selected. Is determined to be receivable, and the subsequent S
At 200, the type and broadcast channel of the television broadcast corresponding to the type number n and the CH number m are stored in the RAM 30c as receivable broadcasts, and the process proceeds to S210.

When it is determined in S180 or S190 that the video signal or the audio signal cannot be demodulated, it is determined that the broadcast currently selected by the tuner unit 12 cannot be received normally. , S210. Then, the processing of S180 and S190 is
Corresponds to the onset Ming reception state determining means, the processing of S200 corresponds to the receivable broadcasting storage means of the onset bright, S200
RAM 30c in which receivable broadcasts are stored by the processing of
Corresponds to receivable broadcast memory means of the onset bright.

Next, in S210, it is determined whether or not the search operation (search) for all broadcast channels of the television broadcast corresponding to the classification number n is completed. If the search operation has not been completed, the CH number m is incremented in S220 in order to execute the search for the next broadcast channel, and then the process proceeds to S160 again.

On the contrary, if it is determined in S210 that the search operation for all broadcast channels has been completed, S23.
Then, it is determined whether or not the search operation (search) for all types of TV broadcasts to be searched is completed. Then, if the search operation for all types of TV broadcasts is not completed, the type number n is incremented in S240 to change the TV broadcast to be searched, and then the process proceeds to S130. If it is determined that the search operation for the TV broadcast of is completed, S2
Move to 50.

It should be noted that, as described above, S110 to S130 which are executed to initialize the type number n and the CH number m of the television broadcast for the receivable broadcast search and then sequentially update these numbers n and m. and processing S210~S240 correspond to the search tuning command output means of the onset bright.

Then, in S250, the list of all the receivable broadcasts stored in the RAM 30c is judged on the display device 6 by the above-mentioned series of processing, and it is judged that the receivable signal is currently receivable. Then, in step S260, all the broadcast channels input by the user are accepted according to the displayed list of receivable broadcasts, and the received broadcasts of the television broadcasts that can be received by the device 10 are received. After executing the reception / registration process of the received broadcast stored in the RAM 30c as the broadcast channel, the process is finished.

When the list of receivable broadcasts is displayed on the display device 6 in S250, as in the case where the list of all television broadcasts to be received is displayed on the display device 6.
By generating image data representing the type of receivable broadcast and a broadcast channel and outputting the image data to the video output switching unit 18, the video output switching unit 18 causes the display device 6 to display a video signal corresponding to the image data. Is output.

Further, in S260, the broadcast channel of the received broadcast stored in the RAM 30c is used as a selectable broadcast channel when the user thereafter inputs a tuning command through the operation unit 4. Then, when a specific broadcast channel is selected from the broadcast channels registered as the received broadcast by the channel selection command input by the user through the operation unit 4, the CPU 30a causes the television broadcast of the broadcast channel. RO demodulated data corresponding to the type of
The demodulation operation of the video demodulation unit 14 and the audio demodulation unit 24 is set according to the demodulation data read from the M30b, and the tuning data corresponding to the broadcast channel is stored in the ROM.
30b, and the oscillators 12a, 22 in the tuner 12 and the frequency converter 22 according to the tuning data.
The oscillation frequencies f1 and f2 of b are set, and the above S140-
The same processing (tuning processing) as the tuning control means similar to S170 is executed.

As described above, in the television receiver 10 of this embodiment, a desired broadcast channel is selected from a plurality of television broadcasts having different broadcasting systems and frequency allocation of broadcast channels, and the broadcast signal is selected. , A video intermediate frequency signal capable of demodulating the video signal in the video demodulation unit 14 (first
Intermediate frequency signal) Control data of the tuner section 12 for frequency conversion to PIF (oscillation frequency f of oscillator 12a)
1) and a second intermediate frequency signal SI capable of demodulating an audio signal (audio carrier) contained in the broadcast signal frequency-converted by the tuner unit 12 by the audio demodulation unit 24.
The control data of the frequency conversion unit 22 for frequency conversion into F2 (oscillation frequency f2 of the oscillator 22a) is stored in the ROM 30a of the microcomputer 30 as tuning data, and the type and broadcast channel of the television broadcast to be received. Is set, the oscillators 12a, 22 in the tuner unit 12 and the frequency conversion unit 22 are set in accordance with the corresponding tuning data.
a is controlled respectively, and the frequencies f1 and f2 of each station-generated signal are made to correspond to the tuning data.

Therefore, the frequencies of the broadcast signal (video modulation signal) and the audio modulation signal input to the video demodulation unit 14 and the audio demodulation unit 24 do not change depending on the type of the television broadcast received, A modulated signal to be demodulated can always be input to each of the demodulation units 14 and 24 at a constant frequency. Therefore, according to the present embodiment, it is possible to receive not only the frequency allocation of the broadcast channel but also the television broadcast in which the frequency characteristic of the audio signal (the frequency difference between the audio carrier and the video carrier) differs depending on the broadcasting system. In addition, in the present embodiment, the video demodulation unit 14 is configured to demodulate various video signals such as video signals of different color systems, and the audio demodulation unit 24 is configured to demodulate audio signals of different modulation systems. In the configuration, when receiving the television broadcast, the microcomputer 30 automatically sets the demodulation operation of each of the demodulation units 14 and 24 according to the type of the television broadcast to be received. Therefore, according to this embodiment,
It is possible to receive not only the frequency allocation of the broadcast channel and the frequency characteristic of the audio signal, but also the television broadcast having a different video signal standard and a different audio signal modulation method.

Further, in the television receiver 10 of this embodiment, if a search command is input through the operation unit 4, the television that can be actually received by the device 10 by the receivable broadcast search process shown in FIG. Broadcasts are automatically searched, and the results are displayed on the display device 6. Therefore, the user does not need to input a channel selection command for each broadcast channel in order to search for receivable television broadcasts, and usability can be improved.

As described above, the television receiver 10 of the present embodiment can demodulate the video signal and the audio signal of the desired broadcast channel selected from various television broadcasts having different broadcasting systems and frequency allocation of broadcast channels. In addition, because it is possible to automatically search for receivable TV broadcasts, for residents in the area where various broadcast waves reach, travelers who move in countries or areas with different types of TV broadcasts with mobile bodies, etc. It becomes a very convenient TV receiver.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can take various forms. For example, when the television receiver 10 of the above embodiment is mounted on a moving body such as an automobile,
Since the receivable TV broadcast changes with the movement of the mobile body, in this case, a device having a current location detection function such as a navigation device separately mounted on the mobile body or a dedicated current location detection device is used. It is also possible to detect the current location, specify the type of television broadcast from which the broadcast wave reaches, and search for a receivable broadcast channel for the television broadcast. Hereinafter, an example of the case where the television receiver 10 is configured in this way will be described.

First, as shown by the dotted line at the bottom of FIG.
A television receiver including a navigation device including a current position detecting device such as a GPS receiver and a GPS receiver dedicated to the television receiving device 10 as the current position detecting device 50 (corresponding to the current position detecting means according to claim 4 ). 10 is connected to the present position detection device 50 so that the present position information can be taken into the microcomputer 30.

On the other hand, in the ROM 30b of the microcomputer 30,
In addition to the tuning data and demodulation data shown in FIG.
Receivable area data as shown in (a) is stored in advance. This receivable area data is used for the television receiver 1
An area (broadcast wave arrival area) where 0 is actually expected to be received by the broadcast wave of the country or region where it is to be received and can be received by the television receiver 10 is a television broadcast such as Country A broadcast, Country B broadcast ... It is set for each type.

That is, for example, since the broadcast radio wave of country A reaches neighboring countries across the border, its radio wave reach range is predicted in advance, and this is used as area information (area a) corresponding to map data, for example. Area information is set for each broadcast radio wave in each country or region by a procedure such as setting, and this is stored in the ROM 30b in advance. still,
The ROM 30b in which the area information is stored in this way functions as the area information storage means according to claim 4 .

In the receivable broadcast search process shown in FIG. 3, which is executed by the CPU 30a when a search command is input from the operation unit 4, the above-described search target broadcast type reception process (S110) is executed immediately after the process is started. 4), the search target broadcast type setting process (S1) shown in FIG.
10 ′) is executed. Incidentally, this process (S110 ')
It is a process for realizing the function as the search tuning command output unit according to claim 4 .

That is, this search target broadcast type setting process (1
In 10 '), first, in S310, the current position detection device 50
The current location (for example,
(Absolute coordinates on map data) are detected. And then S
At 320, the type of television broadcast that can be received at the current location is detected from the area information including the current location (broadcast wave arrival area) by searching the receivable area data, and at S330, the receivable area data is detected. One or more television broadcasts obtained as a result of the search are set as receivable broadcasts (broadcast channels that can be actually received) as television broadcasts to be searched.

In this way, the type of television broadcast predicted to reach the current location of the broadcast wave is detected from the current location information of the mobile unit and the receivable area data, and the detected television broadcast becomes the search target. If the setting is made as the television broadcast, the receivable broadcast search process executed after S120 can be efficiently performed, and the time required to search for the receivable broadcast can be shortened.

On the other hand, in the above embodiment, the description has been made assuming that the broadcasting system of television broadcasting and the frequency allocation of broadcasting channels are simply different for each country or region. For example, for television broadcasting using terrestrial waves in the VHF or UHF band. SH using artificial satellites (broadcasting satellites and communication satellites in Japan) as relay stations
Even in the same country or region, there may be television broadcasts with different broadcasting systems and frequency allocations of broadcast channels, such as television broadcasts using F-band satellite waves.

Even in such a case, the present invention is applied to the television receiving apparatus, the tuning data and the demodulation data are set for each type of television broadcasting, and the video demodulation unit 14 and the audio demodulator are set. If the demodulation unit 24 is provided with a video and audio demodulation circuit corresponding to each broadcasting system and its operation is switched, the television broadcasting of each system can be performed in an area where the radio waves of the television broadcasting of these plural systems reach. It is possible to receive and demodulate the video and audio signals, and receive the television broadcast and demodulate the video and audio signals in a region where only the radio wave of the television broadcast of one system reaches.

Since the frequency band of broadcast radio waves differs between terrestrial television broadcasting and television broadcasting using artificial satellites, a dedicated antenna is required for each receiving antenna. When configuring a television receiver capable of receiving television broadcasting, a mixer circuit that mixes the received signals from the respective receiving antennas may be provided in the input path of the received signal to the tuner unit 12.

Further, for example, even in the case where a television broadcast is made in a different broadcasting system different from the standard broadcasting system adopted in that country, only in a specific area such as a prefecture or a municipality in Japan, By applying the invention, it is possible to realize a television receiving device capable of receiving a television broadcast of a standard broadcast system and a television broadcast of a heterogeneous broadcast system.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a configuration of a television receiving device and peripheral devices thereof according to an embodiment.

FIG. 2 is an explanatory diagram showing a data configuration of tuning data and demodulation data.

FIG. 3 is a flowchart showing receivable broadcast search processing.

FIG. 4 is an explanatory diagram showing a structure of receivable area data and a search target broadcast type setting process using the same.

[Explanation of symbols]

2 ... Receiving antenna, 4 ... Operation part, 6 ... Display device, 8 ... Speaker, 10 ... Television receiving device, 12 ... Tuner part, 1
2a ... Oscillator, 12b ... Mixer, 14 ... Video demodulation unit, 1
6 ... Video signal conversion unit, 18 ... Video output switching unit, 20 ... Synchronization detection unit, 22 ... Frequency conversion unit, 22a ... Oscillator, 22
b ... Mixer, 24 ... Voice demodulation section, 26 ... Voice output switching section, 28 ... Voice detection section, 30 ... Microcomputer (microcomputer), 50 ... Current location detection device.

Claims (5)

(57) [Claims] 1. A television receiver capable of receiving a plurality of types of television broadcasts in which the broadcasting system and the frequency allocation of the broadcast channels are individually set, and the television receiver from the receiving antenna capable of receiving the broadcast radio waves of each television broadcast. Channel selection means for frequency-converting the received signal so that the broadcast signal of the specific broadcast channel in the specific television broadcast becomes the first intermediate frequency signal for video demodulation, and the channel selection means to convert to the first intermediate frequency signal A video demodulation means for demodulating a video signal from the broadcast signal thus generated, and a broadcast signal converted into the first intermediate frequency signal by the tuning means, and an audio modulation signal included in the broadcast signal is used for audio demodulation Frequency conversion means for frequency-converting to an intermediate frequency signal; audio demodulation means for demodulating an audio signal from the audio modulation signal converted into the second intermediate frequency signal by the frequency conversion means; Control data necessary for frequency conversion of a broadcast signal and a sound modulation signal into a first intermediate frequency signal and a second intermediate frequency signal by the tuning means and the frequency conversion means, respectively for each broadcast channel of television broadcasting. When the control data storage means in which is stored and a channel selection command indicating the type and broadcast channel of the television broadcast to be received from the outside are received, the control data storage means receives the television broadcast and the broadcast channel corresponding to the channel selection command. When the control data is read out, the tuning control means for controlling the tuning means and the frequency conversion means according to the control data, and the search instruction for the receivable broadcast from the outside are received,
For the control means, each television broadcast that can be received by the device is
Send a tuning command for all broadcast channels to each broadcast channel.
Search channel selection command output means for sequentially outputting each channel, and each time the search channel selection command output means outputs the channel selection command.
The video signal and the audio demodulation means.
And reception status determination to determine whether or not the audio signal has been demodulated
Means and the reception state determination means to detect the video signal and the audio signal.
If it is determined that the demodulation has been successful, then the search tuning finger
TV corresponding to the tuning command output by the command output means
The transmission and broadcasting channels are the broadcasts that can be actually received now.
Receivable broadcast storage means for storing in receivable broadcast storage means
And a receivable broadcast stored in the receivable broadcast storage means.
A television receiver , comprising: an informing unit for informing a user . 2. The video demodulating means is configured to be able to demodulate a plurality of video signals of different standards, respectively, and when the tuning control means receives the tuning command, the television broadcasting corresponding to the tuning command. 2. The television receiving apparatus according to claim 1, wherein the demodulation operation of the video demodulating means is set so as to demodulate a video signal of the standard adopted in (1). 3. The audio demodulating means is configured to be able to demodulate a plurality of audio signals having different modulation systems, respectively, and when the tuning control means receives the tuning command, the television corresponding to the tuning command. The television receiver according to claim 1 or 2, wherein the demodulation operation of the audio demodulation means is set so as to demodulate an audio signal of a modulation system adopted in broadcasting. 4. A present location detecting means for detecting a present location, and area information storing means for storing area information indicating an area where a broadcast wave of each television broadcast to be received reaches for each television broadcast. When the search tuning command output means receives the search command, the broadcast radio wave is transmitted to the current location based on the current location detected by the current location detection means and the area information stored in the area information storage means. 4. The television according to claim 3 , wherein the television broadcast to be received is specified, and a tuning instruction corresponding to each broadcast channel of the specified one or more television broadcasts is sequentially output to the tuning control means. Receiver. Wherein said television receiver, according to claim 1 to claim 4 television receiver according to any one, characterized in that mounted on the moving body is a mobile television receiver device used.