JPH099166A - Video/audio output system - Google Patents

Abstract

PURPOSE: To allow a viewer to listen to a voice not outputted from a speaker when images are displayed on plural screens of, e.g. a television receiver. CONSTITUTION: The video/audio output system is made up of a transmission section 4 sending audio signals not sounded from speakers 3L, 3R (audio signals of a main screen 2A or a sub screen 2B or audio signals of slave screens of all screen channels) in the case of displaying split screens consisting of a main screen 2A and a sub screen 2B or full screen channels of a CATV system, a reception section 5 receiving and demodulating the audio signals sent from the transmission section 4, and a headphone 6 providing an output of the audio signal demodulated by the reception section 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video / audio output system capable of simultaneously displaying a plurality of screens and transmitting and outputting the sound of a desired screen among the screens.

[0002]

2. Description of the Related Art Recent television receivers include, for example, a plurality of built-in tuners (terrestrial broadcasting, satellite broadcasting, etc.),
It is possible to simultaneously display a plurality of images supplied from an external device such as a video deck or a laser disc player. For example, as shown in FIG. 15A, a cathode ray tube 71 (Cath
A display part of an ode Lay tube (hereinafter referred to as a CRT) is divided into, for example, left and right, and a main screen 71A and a sub-screen 71B of the same size can be displayed. Then, on these screens, it is possible to select and display an image desired by the user from the images supplied from the above-mentioned tuners and external devices.

The audio output of the two-split screen is, for example, the main screen 7
Only the sound of 1A is output from the speakers 72L and 72R, and when the sound of the sub-screen 71B is desired to be output from the speakers 72L and 72R, the sound is switched by an operation means such as a remote commander,
Only the sound of the sub screen 71B can be output.

Recently, CATV (Cable Televisi
on ... Cable television) system has spread, and as one of its services, as shown in FIG. 15 (b), simultaneously displaying the screens of all channels that can be received by the CATV tuner 73. You can do it. The user has a sub-screen 71a of all channel screens.
71o can be displayed as a menu screen, and a desired program can be selected from the programs displayed on this screen. When this all channel screen is displayed, the speakers 72L and 72R have no relation to the program content B.
GM (Back Ground Music) will be output.
The menu screen and BGM are set and broadcast as one channel of the CATV system.

[0005]

However, as shown in FIG.
In the case of the two-split screen shown in (a), since the sound output from the speaker can output only the sound of either the main screen or the sub-screen, a plurality of users can use one television receiver. You can watch different images in, but it is impossible to listen to different sounds. Further, since the all-channel screen shown in FIG. 15B displays the image information sent from the broadcasting station side as it is, it is impossible to select the sound on the receiving side.
The speaker outputs BGM that has nothing to do with the program content. Therefore, it is impossible to select and listen to the sound of each screen among all the channel screens.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and video display means capable of synthesizing and displaying images from a plurality of video sources at the same time, Audio output processing means for outputting a sound corresponding to one of the plurality of images displayed on the video display means, all sounds of the plurality of images, or the sound output of sounds for the plurality of images A video / audio output system is configured to include a voice transmitting unit that transmits a voice that is not output from the unit and a voice receiving unit that receives the voice transmitted from the voice transmitting unit.

[0007] In addition, a video source in which a video and audio of each broadcast of a plurality of selectable channels are set, and a channel for supplying a video signal for displaying a list of the video of each broadcast is set; A video display unit capable of displaying an image of the selected channel; an audio tuner unit capable of demodulating and outputting the audio of the selected channel in the video source regardless of the video display unit; A voice transmitting unit capable of transmitting the voice of the channel of the image displayed on the display unit and the voice output from the voice tuner unit, and the voice transmitted from the voice transmitting unit can be received and output. A video / audio output system is configured by including audio receiving means.

[0008]

According to the present invention, when a plurality of screens are displayed at the same time, it becomes possible to transmit and listen to the sound not output from the speaker from the inside of the device body.

[0009]

EXAMPLES Examples of the present invention will be described below in the following order. 1. Sending the audio of the sub screen of 2 split screen. 1-1. System overview. 1-2. Circuit block configuration of a television receiver. 2. Switching of the two-split screen audio on the receiving side. 2-1. System overview. 2-2. Circuit block configuration of a television receiver. 2-3. Circuit block configuration of the transmitter. 2-4. Circuit block configuration of the receiver. 2-5. The principle of voice selection. 3. Audio transmission of individual screens of all channels of CATV. 3-1. System overview. 3-2. Circuit block configuration of a television receiver. 4. Switching on the receiving side of the sound of all channel screens of CATV. 4-1. System overview. 4-2. Circuit block configuration of a television receiver. 4-3. Circuit block configuration of the transmitter. 4-4. Circuit block configuration of the receiver. 5. Integrated receiver and headphones. 5-1. System overview. 5-2. Enlarged view of headphones.

<< 1. Sending the audio of the sub screen of 2 split screen. >><1-1. System Overview> First, referring to FIGS. 1 and 2, as a first embodiment, an example of transmitting sub-screen audio of a two-divided screen of a television receiver will be described. FIG. 1 is a diagram showing an outline of the video / audio output system of the first embodiment. The television receiver 1 has, for example, a wide type CRT 2 having an aspect ratio of 16: 9. Further, for example, a tuner such as a terrestrial broadcast tuner and a satellite broadcast tuner is built in, and a video signal supplied from each tuner can be selected and displayed as a normal normal or wide size screen. For example, a plurality of video signals supplied from the tuner can be used to form a two-split screen including a main screen 2A and a sub-screen 2B having a 4: 3 aspect ratio.

The speakers 3L, 3R output the sound of the screen currently displayed on the CRT 2 when displaying a normal screen, and when displaying a two-split screen as shown, for example, the main screen 2A. It is designed to output only the voice. When the two-split screen is displayed, the transmission unit 4 modulates the audio signal of the sub-screen 2B and transmits it to the reception unit 5, for example. The receiving unit 5 has a receiving antenna A ₂ , a connection terminal for the headphones 6, and the like, and is separated from the television receiver 1, and when the power is turned on, the audio signal transmitted from the transmitting unit 4 can be received. The audio signal demodulated and amplified here can be output from the connected headphones 6.

<1-2. Circuit Block Configuration of Television Receiver> Next, a circuit block configuration of the television receiver 1 will be described. 2 is a circuit block diagram showing a main part of the television receiver 1 shown in FIG. 1, and the same parts as those in FIG. 1 are designated by the same reference numerals. The main tuner 7 is composed of, for example, a terrestrial broadcast, and the sub tuner 8 is composed of, for example, a tuner for receiving a satellite broadcast, and selects a broadcast wave according to the user's selection. The video signal processing units 9 and 10 detect an audio signal from the received signals selected by the main tuner 7 and the sub tuner 8, respectively, and perform various video signal processes to output RGB signals.

The synthesizing / selecting unit 11 includes a video signal processing unit 9,
One of the RGB signals supplied from 10 is selected, or each RGB signal is combined to form a two-split screen consisting of the main screen 2A and the sub-screen 2B shown in FIG.
Output to T2. Main screen 2 when configuring a 2-split screen
A is composed of the image selected by the main tuner 7, and the sub-screen 2A is composed of the image selected by the sub-tuner 8, and a synthesis process such as Snd ₁ is performed. The audio signal Snd ₁ supplied from the video signal processing unit 9 is supplied to the audio processing unit 12 and subjected to various kinds of signal processing, then amplified by the amplifier 13 and output from the speaker 3 (L, R). That is, the main tuner 7
The sound of the image selected in step 1 and forming the main screen 2A is output from the speaker 3 (L, R).

The audio signal Snd ₂ output from the video signal processing unit 10 is also supplied to the transmitting unit 4. Where the audio signal Sn
After being subjected to a predetermined modulation processing, d ₂ is transmitted from the transmitting antenna A ₁ and received by the receiving unit 5 via the receiving antenna A ₂ . Then, the receiver 5 receives the audio signal Snd ₂ transmitted from the transmitter 5, demodulates the audio signal Snd ₂ , and supplies the demodulated signal to the connected headphones 6. That is, the sound of the sub screen 2A selected by the sub tuner 8 is output from the headphones 6.

The control unit 14 is responsive to various commands input from the remote commander RC via the light receiving unit R, for example, channel selection by the main tuner 7 and sub-tuner 8, image selection by the synthesizing / selecting unit 11, image synthesizing, or Control of various signal processes in the video signal processing units 9 and 10 and the audio processing unit 12 is performed.

As described above, when a two-split screen is displayed on the CRT 2, the sound of the image displayed on the sub-screen 2B is output from the headphones 6 via the transmitting unit 4 and the receiving unit 5, whereby the speaker 3 ( It becomes possible to listen to the sound that is not output from L, R).

Although the two tuners of the main tuner 7 and the sub-tuner 8 are given as an example of the video source, other than this, for example, a video deck to which a video signal is supplied from the outside, a laser disc player or the like may be used. You can
Furthermore, even when the video source is configured by the main tuner 7, the sub-tuner 8, and the three or more split screens by the video deck, the laser disc player, etc., the speaker 3 (L, R)
It is also possible to output voices other than the voice output from the headphone 6.

<< 2. Switching of the two-split screen audio on the receiving side. >><2-1. System overview. > Next, FIGS.
Therefore, an example in which the receiving unit selects the audio signal transmitted from the transmitting unit will be described as the second embodiment. FIG. 3 is a diagram showing an outline of the video / audio output system of the second embodiment, and the same parts as those in FIG. 1 are designated by the same reference numerals. In the second embodiment, the transmitting section 16 can superimpose a plurality of audio signals on the same carrier wave and transmit the same from the transmitting antenna A ₁ as described later in detail with reference to FIG. The receiving unit 28 and select key K ₁ is provided in this embodiment, a user from the audio signal received by the receiving antenna A ₂ by operating the select key K ₁ as described in detail later in FIG. 6 A desired audio signal can be selected and output to the headphones 6.

<2-2. Circuit block configuration of a television receiver. 4 is a diagram showing a partial circuit block of the television receiver shown in FIG. 3, and the same portions as those in FIG. 2 are designated by the same reference numerals. As shown in the figure, the television receiver of the second embodiment has substantially the same block configuration as the television receiver of the first embodiment, but in this embodiment, the audio processing units 12 and 15 are used. The two types of audio signals Snd ₁ and Snd ₂ output from are supplied to the transmission unit 16. That is, the audio signals Snd ₁ and Snd _{2 of} each video source (main tuner 7, sub tuner 8, etc.) are simultaneously modulated and transmitted.

The receiving unit 28 receives the voice signals Snd ₁ and Snd ₂ transmitted from the transmitting unit 16 with the receiving antenna A ₂ , and
The desired sound signal Snd ₁ or Snd ₂ selected by the select key K ₁ shown in ( ₁₎ can be demodulated and output to the headphones 6.

As in the first embodiment, the two tuners of the main tuner 7 and the sub-tuner 8 are given as video sources, but other than this, for example, a video deck to which a video signal is supplied from the outside, It may be configured by a laser disc player or the like. Further, when the video source is composed of a main tuner 7, a sub-tuner 8 and three or more split screens by a video deck, a laser disc player, etc.,
It is also possible to output voices other than the voices output from the speakers 3 (L, R) from the headphones 6.

<2-3. Circuit block configuration of the transmitter. > FIG. 5 is a diagram showing a circuit block constituting the transmitter 16 in the second embodiment. The modulators 17a and 17b surrounded by the alternate long and short dash line have substantially the same block configuration as the input stage of the transmitter 16. Modulator 1
Reference numerals 8 and 18 receive the audio signals Snd ₁ and Snd ₂ from the audio processing units 12 and 15, respectively, and perform predetermined modulation processing. The modulated signals modulated by the modulators 18, 18 are pseudo noise (PN) by the multipliers 20, 20.
The PN sequence generated by the sequence generator 19 is multiplied to form a spread spectrum signal (hereinafter referred to as SS signal).

The SS signal is multiplied by different orthogonal functions W / F ₁ and W / F ₂ output from the orthogonal function generators 21a and 21b in multipliers 22 and 22, respectively, and then the adder 23 is added.
Are added together to form one signal. Then, the band is limited by the band pass filter 24, amplified by the high power amplifier, and transmitted from the transmitting antenna A ₁ . Orthogonal function W / output from the orthogonal function generators 21a and 21b
F ₁ and W / F ₂ are, for example, one of Hadamard functions
Walsh Function etc.

In the present embodiment, the example in which the audio signals Snd ₁ and Snd ₂ of the two tuners of the main tuner 7 and the sub-tuner 8 are multiplied by the carrier waves of the same frequency, the number corresponding to the number of tuners is 2. Although the example in which the orthogonal function generators 21 and 22 are provided has been described, when an external device such as a VCR or a laser disc player is used as described above,
The modulation part is formed by the number corresponding to the number of external devices,
An orthogonal function generator that generates different orthogonal functions may be provided in each modulator.

<2-4. Circuit block configuration of the receiver. > FIG. 6 is a diagram showing a circuit block constituting the receiving unit 28. The transmitting antenna A of the transmitting unit 16 shown in FIG.
_The audio signals Snd ₁ and Snd ₂ transmitted from ₁ are received by the antenna A.
_The signal is received at ₂ , then amplified by the low noise amplifier 29, and then band-limited by the bandpass filter 30. The audio signals Snd ₁ and Snd ₂ band-limited by the bandpass filter 30 are
In the multiplier 32, the PN sequence generated from the pseudo noise sequence generator 31 is multiplied, and the pseudo noise sequence generator 31 is the pseudo noise sequence generator 1 of the transmitter 16.
It is configured so that a PN sequence equivalent to 9 can be generated, and despreading is performed here.

The multiplier 33 includes orthogonal function generators 34a and 3a.
The orthogonal function output from 4b and selected by the select switch SW ₁ and output is multiplied by the signal despread in the multiplier 32. The orthogonal function generator 34a is, for example, the orthogonal function W / generated by the orthogonal function generator 21a of the transmitter 16.
F ₁ , and the orthogonal function generator 34b is an orthogonal function generator 21b.
The same orthogonal function as the orthogonal function W / F ₂ generated in 1 can be generated. The demodulator 36 demodulates the signal supplied from the multiplier 33. However orthogonal function W by the select switch SW ₁ as will be described in detail later /
When F ₁ is selected, only the audio signal Snd ₁ multiplied by the orthogonal function W / F ₁ in the transmission unit 16 is selected, and when the orthogonal function W / F ₂ is selected by the select switch SW ₁ , Only the audio signal Snd ₂ multiplied by the orthogonal function W / F ₂ is demodulated in the transmitter 16 and supplied to the headphones 6 via the output terminal t.

The receiving unit 28 described here has two orthogonal function generators 34 corresponding to the transmitting unit 16 described above.
Although an example in which a and 34b are provided has been described, when a video deck, a laser disc player, etc. are connected to the main body of the television receiver 1 and the number of video sources is 3 or more,
The orthogonal function generator 21 (a, b ...
..) corresponding to the number of 3 or more orthogonal function generators 34
(A, b ...) may be provided.

<2-5. The principle of voice selection. > Hereinafter, the principle that the receiving unit 28 can select the output voice will be described. The transmitter 16 modulates the audio signals Snd ₁ and Snd ₂ by the modulators 18 and then multiplies the PN sequence to convert into SS signals, and further, the audio signals of the respective video sources (main tuner 7 and sub tuner 8). Snd ₁ , Snd ₂
Different orthogonal functions W / F ₁ and W / F ₂ are multiplied for each.
The characteristics of the SS signal generated by multiplying the orthogonal function W / F ₁ or W / F ₂ cannot be demodulated unless the receiving section 28 multiplies the same PN sequence, for example. Furthermore, the orthogonal function generator 2 corresponding to each video source
By providing 1a and 21b and multiplying them by different orthogonal functions, audio signals Snd ₁ and Sn of a plurality of video sources can be obtained.
It has the property that d ₂ can be multiplexed on a carrier of the same frequency.

After despreading the received signal by multiplying the received signal by the PN sequence, for example, when it is desired to demodulate only the audio signal Snd ₁ of the main tuner 7, the select switch SW ₁ is switched to the terminal a side. Orthogonal function W / F ₁
The main tuner 7 in the demodulation unit 36 is multiplied by
It becomes possible to demodulate only the audio signal Snd _{1 of} . Further, for example, when it is desired to demodulate only the audio signal Snd ₂ of the sub-tuner 8, the select switch SW ₁ is switched to the terminal b side and the orthogonal function W / F ₂ is multiplied to obtain the demodulation unit 3
6, it becomes possible to demodulate only the audio signal Snd ₂ of the sub tuner 8. In the second embodiment as described above, by connecting the headphones 6 to the receiving unit 5, the user selects one of the sounds while listening to both the main screen 2A and the sub screen 2B and listens to the headphones 6. It is possible.

<< 3. Audio transmission of individual screens of all channels of CATV. >><3-1. System overview. > Next, as a third embodiment, a case of transmitting individual screen audio of all channel screens of the CATV system will be described. FIG. 7 is a diagram showing an outline of the video / audio output system of the third embodiment.
The television receiver 40 of this embodiment also has a wide-type CRT 41 having, for example, a 16: 9 aspect ratio, and a tuner such as a terrestrial broadcasting tuner and a satellite broadcasting tuner. Further, in this embodiment, the CATV tuner 4 is used.
3 is provided so that the broadcast program supplied from the broadcasting station by wire can be viewed.

As will be described later with reference to FIG. 8, the CATV tuner 43 is provided with a tuner dedicated to audio in addition to the conventional configuration. For example, when all channel screens are selected, a child screen that constitutes all channel screens is displayed. The sound of any one of the screens 41a to 41o can be selected and output.

The video signal supplied from each tuner can be selected to be displayed as a normal normal or wide size screen, and can be supplied from each tuner as in the first and second embodiments. It is configured such that a two-split screen can be formed by a plurality of generated video signals.

When displaying a normal screen, the speakers 42L and 42R output the sound of the currently displayed screen,
Further, as shown in the figure, when the all-channel screen supplied from the CATV tuner 43 is displayed, for example, a predetermined BGM supplied simultaneously with the all-channel screen is displayed.
It is designed to output only. When the transmission unit 44 displays all channel screens, for example, the CATV
The audio signal selected by the audio-only tuner built in the tuner 43 is modulated and transmitted to the receiving unit 45.

The receiving unit 45 has a receiving antenna A ₂ , a connection terminal for the headphones 6 and a select key K ₁ as in the receiving unit 28 described with reference to FIG. 3, but in this embodiment, the select key K ₁ is used. By operation, the audio signal transmitted from the transmission unit 44, that is, the audio signal selected by the audio-only tuner of the CATV tuner 43 can be received and selected. And this receiving unit 45
The audio signal demodulated and amplified in (4) is output from the connected headphones 6.

<3-2. Circuit block configuration of a television receiver. FIG. 8 is a diagram showing a partial circuit block of the television receiver and the CATV tuner 43 shown in FIG. The CATV tuner 43 is connected to the main body of the television receiver 40 by a dedicated cable or the like as an external input device, and is independent of the channel selection unit 46 for selecting a channel of a normal broadcast program and the channel selection unit 46. An audio-only tuner 47 capable of selecting only audio is provided. Voice-only tuner 47 is provided as a tuner for selecting the voice of the child screen 41a~41o When viewing an example all channels screen, selected here sound signal Snd ₂ were various signal processing by the audio processing unit 52 facilities After being transmitted 44
Is supplied to.

The tuner 48 selects broadcasting waves such as terrestrial broadcasting and satellite broadcasting. Although only one is shown here for the sake of convenience, in practice, for example, as shown in FIG. 2, two tuners (main tuner 7, sub-tuner 8) are used.
Etc.) may be provided.

The switch SW ₂ selects a reception signal supplied from the channel selection unit 46 and the tuner 48 of the CATV tuner 43 and supplies either one to the video signal processing 49. The video signal processing unit 49 subjects the received signal selected by the switch SW ₂ to predetermined signal processing to obtain RGB signals.
The signal is supplied to the CRT 41 and the audio signal Snd ₁ is output to the audio processing unit 50. After the audio signal is processed by the audio processing unit 50,
The signal is amplified by the amplifier 51 and output from the speaker 42 (L, R), or supplied to the transmitting unit 44. That is, the audio of the broadcast demodulated by the tuner 48 or the audio of the broadcast program selected by the channel selection unit 46 (including BGM of all channel screens) is output from the speaker 42 (L, R).

The transmitting section 44 is an audio signal processing section 50,
And 52, the audio signals Snd ₁ and Snd are input and predetermined modulation processing is performed. The transmission unit 44 has the same function as the transmission unit 16 described above with reference to FIG. 5, and the audio signals Snd ₁ and Snd _{2 are included.}
And the audio signal Snd ₁ supplied from the audio processing unit 50 is multiplied by, for example, an orthogonal function W / F ₁ ,
The audio processing unit 52 selected by the audio-only tuner 47
The audio signal Snd ₂ output from the above is multiplied by the orthogonal function W / F _2, and then added and transmitted from the transmitting antenna A ₁ .

The receiving unit 45 is also the receiving unit 2 described with reference to FIG.
8 has a configuration similar to that of FIG. 8, and multiplies either the orthogonal function W / F ₁ or W / F _{2 in} the preceding stage of demodulating the audio signals Snd ₁ and Snd ₂ transmitted from the transmission unit 44, thereby obtaining the channel selection unit. 46, or only the audio signal Snd ₁ or Snd ₂ selected by the audio-only tuner 47 can be demodulated and output by the headphones 6.

That is, when all channel screens are selected by the channel selection unit 46, the speaker 42 (L,
Although RGM outputs BGM for all channel screens, it becomes possible to output any one of the sub screens 41a to 41o selected from the audio dedicated tuner 47 from the headphones. Therefore, the user can display the video on the screen of all channels and the sub screen 41a from the headphones.
It becomes possible to monitor the sound of ~ 41o.

As in the first and second embodiments, the two tuners of the built-in tuner 48 and the CATV tuner 43 are given as image sources, but other than this, for example, an image signal is supplied from the outside. It may be configured by a video deck, a laser disc player, or the like.

<< 4. Switching on the receiving side of the sound of all channel screens of CATV. >><4-1. System overview. > Next, as a fourth embodiment according to FIGS. 9 and 10, a case where the sound of all channel screens is switched on the receiving side will be described. FIG. 9 is a diagram showing the structure of the video / audio output system of the fourth embodiment. As shown in the figure, also in the case of the present embodiment, the television receiver 40, the CATV tuner 43, the transmitter 53,
The receiving unit 54 is provided with a tuning key K ₂ in addition to the select key K ₁ , although the receiving unit 54 and the like are configured. That is, in this embodiment by operating the channel selection keys K ₂ if you select the full channel screen is configured to be able to select the voice of the child screen 41A～41o.

<4-2. Circuit block configuration of a television receiver. > FIG. 10 is a diagram showing some circuit blocks of the television receiver 40 and the CATV tuner 43 shown in FIG. In this embodiment, although the configuration is almost the same as that of the third embodiment, a plurality of audio dedicated tuners 47a to 47o corresponding to the child screens 41a to 41o constituting the all-channel screen in the CATV tuner 43, respectively. Is provided. And audio-only tuners 47a-47
audio signal Snd output from o to ₂ a _{~Snd 2} o simultaneously supplied to the transmitting section 53, and be transmitted from the transmitting antenna A ₁ is multiplied by a different orthogonal function.

<4-3. Circuit block configuration of the transmitter. As shown in FIG. 11, the transmission unit 53 has a configuration in which a plurality of modulation units 53 are provided, and for example, the modulation unit 53A corresponding to the audio signal Snd ₁ supplied from the audio processing unit 50, and Audio tuners 47a-47
modulation unit 53a~53o corresponding to the audio signal Snd ₂ a ~Snd ₂ o supplied from o so that the is provided. And
Audio signal Sn supplied from the audio processing units 50 and 52
Orthogonal function W / F different for d ₁ and Snd a to Snd ₂ o depending on the orthogonal function generators 21A and 21a to 21o, respectively.
It is configured to multiply by _{1 to} W / F16 for transmission.
Here, for example, the orthogonal function W / F ₁ is added to the audio signal Snd ₁ supplied from the channel selection unit 43, and the audio signals Snd ₂ a to
Snd ₂ o is adapted to be multiplied by orthogonal functions W / F _{2 to} W / F ₁₆ , respectively.

<4-4. Circuit block configuration of the receiver. The receiving section 54 receives the transmission signal at the receiving antenna A ₂ and demodulates it. However, by multiplying it by a predetermined orthogonal function before the modulation, the channel selecting section 4
6 or only _{one of} the audio signals Snd ₁ or Snd a to Snd ₂ o output from the audio dedicated tuners 47a to 47o can be demodulated. Here, for example, FIG.
2, the orthogonal functions W / F _{1 to} W similar to the orthogonal function generators 21a and 21a to 21o of the transmitter 53 are shown.
/ F16 generating orthogonal function generator 34A, 34a-34
o is provided.

For example, when the select key K ₁ is operated, the select switch SW3 is switched, and the orthogonal function supplied from the orthogonal function generator 34A or the tuning switch SW4 is selected and multiplied by the multiplier 33. The audio of either the channel selection unit 46 or the audio-only tuner 47 is selected and output. here,
When connected to the terminal e, the multiplier 33 is provided with the orthogonal function generator 3
The orthogonal function W / F ₁ generated at 4 A is supplied, and the demodulation unit 35 demodulates only the audio signal Snd ₁ selected by the channel selection unit 46.

If the tuning key K ₂ is operated with the terminal f of the select switch SW ₃ selected by the select key K ₁ , the orthogonal function W / F ₂ ~ generated by the orthogonal function generators 34a ~ 34o. One of W / F ₁₆ is selected and multiplied by the multiplier 33, and the audio signal Snd ₂ supplied from the audio dedicated tuners 47a to 47o is selected.
Only one of a to Snd ₂ o can be demodulated. That is, when the user operates the channel selection key K ₂ , the sound output from the sound-only tuners 47a to 47o can be selected and output by the receiving unit 54. Further, it is possible to demodulate different voices in each receiving unit by using a plurality of receiving units and selecting and multiplying different orthogonal functions in each receiving unit.

<< 5. Integrated receiver and headphones.
>><5-1. System overview. > FIG. 13 is a diagram showing an outline of the video / audio output system of the fifth embodiment. Television receiver 40, CATV as shown
Tuner 43, transmitter 53 and receiver, select key K
_1. Headphones with integrated tuning key K ₂ etc. That is, in this embodiment, the sound transmitted from the television receiver 40 can be directly received by the headphones and selected.

<5-2. Enlarged view of headphones. 〉
FIG. 14 is an enlarged view showing the headphones 55 shown in FIG. The speaker units 56 and 57 output right sound and left sound from a built-in speaker connected to the headband 58. In the present embodiment, for example, a receiving section 59 is provided inside the speaker section 57, and the transmitting section 54 of the television receiver 40 is provided.
The reception antenna 60 can directly receive the audio signal transmitted from the. The receiving unit 58 is configured to demodulate the audio signal received by the receiving antenna 60, but is configured similarly to the receiving units 28 and 54 shown in FIGS. 6 and 12 described above, and the operating unit 61. Since the orthogonal functions W / F _{1 to} W / F ₁₆ can be selected and multiplied by operating the select key, the channel selection key, etc. provided in, the user can demodulate only the audio of the broadcast program desired by the user. Can be output.

As described above, by incorporating the receiving unit in the headphones, the receiving unit separately disposed on the floor, for example, as shown in the first to fourth embodiments, becomes unnecessary,
Furthermore, there is no need to connect the receiving section and the headphones with a cable. Also, when the receiving unit is configured separately, it is necessary to operate the select key and the tuning key provided in the receiving unit when performing voice selection. Although it was necessary to do so, by providing an operation unit for tuning in the headphones, it becomes possible to perform voice selection on the spot.

[0051]

As described above, the video / audio output system of the present invention can display a predetermined screen output from a speaker when displaying a split screen including two or three screens, for example. In addition to being able to do so, it becomes possible to listen to each voice using a speaker and headphones. Therefore, for example, it is suitable when two or more different programs are desired to be watched. Also, for example, CATV
By installing a tuner for audio only in the system,
The image of the receivable channel is displayed as a sub screen at the same time. When the all channel screen is displayed, the sound of the sub screen that could not be heard from the speaker can be transmitted and can be heard with headphones. .

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a video / audio output system according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a partial circuit block of the television receiver of the first embodiment.

FIG. 3 is a diagram showing an outline of a video / audio output system of a second embodiment.

FIG. 4 is a diagram showing a partial circuit block of a television receiver according to a second embodiment.

FIG. 5 is a diagram showing a partial circuit block of a transmitter of the second embodiment.

FIG. 6 is a diagram showing a partial circuit block of a receiver of the second embodiment.

FIG. 7 is a diagram showing an outline of a video / audio output system of a third embodiment.

FIG. 8 is a diagram showing a partial circuit block of a television receiver according to a third embodiment.

FIG. 9 is a diagram showing an outline of a video / audio output system of a fourth embodiment.

FIG. 10 is a diagram showing a partial circuit block of a television receiver according to a fourth embodiment.

FIG. 11 is a diagram showing a partial circuit block of a transmitter of the fourth embodiment.

FIG. 12 is a diagram showing a partial circuit block of a receiver of the fourth embodiment.

FIG. 13 is a diagram showing an outline of a video / audio output system of a fifth embodiment.

FIG. 14 is a diagram showing an external appearance of a receiver-integrated headphone according to a fifth embodiment.

FIG. 15 is a diagram illustrating an overview of a split screen and an all-channel screen of a conventional television receiver.

[Explanation of symbols]

2A main screen 2B sub screen 7 main tuner 8 sub tuner 4, 16, 44 transmitter 5, 28, 45, 59 receiver 19, 31 pseudo noise sequence generator 21, 21a to 21o, 34, 34a to 34o orthogonal function generation Parts 41a to 41o Sub screen 43 CATV tuner 46 Channel selection unit 47, 47a to 47o Audio-only tuner 55 Headphones 61 Operation unit

Claims (2)

[Claims] 1. A video display unit capable of synthesizing images from a plurality of video sources and displaying them at the same time, and outputting a sound corresponding to one of the plurality of images displayed on the video display unit. Audio output processing means, all audio of the plurality of images, or audio transmission means for transmitting audio not output from the audio output means out of audio for each of the plurality of images, and transmitted from the audio transmission means A video / audio output system comprising: a voice receiving means for receiving a voice. 2. A video source in which a channel for supplying video and audio of each broadcast of selectable channels and a video signal for displaying a video of each broadcast are set, and from the video source A video display unit capable of displaying an image of a selected channel; an audio tuner unit capable of demodulating and outputting a sound of a selected channel in the video source regardless of the video display unit; A voice transmitting unit capable of transmitting the voice of the channel of the image displayed on the display unit and the voice output from the voice tuner unit, and the voice transmitted from the voice transmitting unit can be received and output. An audio / video output system comprising: an audio receiving unit.