JP2008011253A - Broadcast receiving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broadcast receiving device that enables each of a plurality of viewers to listen to only the sound of a desired program when the plurality of viewers view a plurality of programs on one display simultaneously. <P>SOLUTION: The broadcast receiving device 1 has first and second speakers 13A and 13B disposed on the left and right of the display 12 and third and fourth speakers 14A and 14B for muting disposed nearby the speakers 13A and 13B. On the display 12, first and second pictures 16 and 17 can be displayed on the left and right simultaneously; and the speaker 14A is driven having the opposite phase from the speaker 13B on the opposite side and the speaker 14B is driven having the opposite phase from the speaker 13A on the opposite side to reduce the sound from the speaker 13B for a viewer 18 and the sound from the speaker 13A for a viewer 19. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a broadcast receiving apparatus capable of simultaneously displaying received images of two broadcast programs on one display.

  When a TV has the same performance and function as a dedicated audio device, an atmosphere equivalent to viewing or listening to music by the audio device is required. For example, when using a TV installed in a living room, There is a desire to eliminate daily noises other than the music you want to listen to, such as human voices and sounds from the dining space.

  As a response to this type of request, for example, there is a television system disclosed in Patent Document 1, and when a reproduction sound is output from a front speaker, a sound having a phase opposite to that output from the front speaker is output. Even if the sound output from the rear speaker is attenuated and the sound from the front speaker is attenuated and the TV is viewed in the living space, it is difficult to hear the sound of the TV in the dining space.

On the other hand, as a conventional television receiver having a display with a relatively large screen size, a picture-in-picture, a picture-by-picture, two screens that can simultaneously display a screen of a plurality of channels (or programs) There are models equipped with functions such as a dual window that displays the left and right.
JP 2004-7039 A

  However, according to a conventional television receiver, when a plurality of viewers try to watch a broadcast of a plurality of programs whose images are simultaneously output on a display, the sound (sound and music) of each program is output at the same time. Therefore, for each viewer, the sound of the program that is not viewed becomes annoying, and the sound of the program that the user wants to listen to is difficult to hear.

  Therefore, an object of the present invention is to provide a broadcast receiving apparatus in which when a plurality of programs are viewed simultaneously by a plurality of viewers on a single display, each viewer can hear only the sound of the desired program. There is to do.

  In order to achieve the above object, the present invention displays display means for displaying an image of a first broadcast program on the left side and displaying a second broadcast program on the right side, and a first sound of the first broadcast program. A first speaker for outputting, a second speaker for outputting the second sound of the second broadcast program, and an output level of the first sound at a front left side of the display means. Provided is a broadcast receiving apparatus comprising control means for making the output level of the second sound higher than the output level of the first sound in front of the right side of the display means. .

  According to the broadcast receiving apparatus of the present invention, when a plurality of viewers view a plurality of programs at the same time on one display, each viewer can hear only the sound of a desired program.

(Configuration of broadcast receiver)
FIG. 1 shows an outline of a broadcast receiving apparatus according to an embodiment of the present invention. The broadcast receiving apparatus 1 includes a display 12 using a liquid crystal display or a plasma display on the front surface of a housing 11, two left and right first and second speakers 13A and 13B (first and second main speakers), and a third. , Fourth speakers 14A and 14B (first and second auxiliary speakers), a plurality of operation buttons 15, a remote controller (hereinafter referred to as "remote controller") 2, and the like.

  The remote controller 2 includes buttons for mode setting, channel selection, volume adjustment, distance setting for setting the distance between the broadcast receiving apparatus 1 and the viewers 18 and 19, and infrared light corresponding to the operation of the button. It is comprised so that the optical signal by can be output. Further, the remote controller 2 includes a microphone (not shown) and has a function of transmitting data related to sound generated by the user when setting the distance to the broadcast receiving apparatus 1.

  The housing 11 includes a receiving circuit that receives radio waves from the antenna, displays an image on the display 12 and outputs an audio signal, and includes first and second programs (channels) corresponding to the first and second programs (channels). The screens 16 and 17 can be simultaneously output to the display 12. For example, as shown in FIG. 1, the first screen 16 is viewed by the viewer 18, and the first screen 17 is viewed by the viewer 19. It can be done.

  The first to fourth speakers 13A, 13B, 14A, and 14B may have the same specifications, but the first and second speakers 13A and 13B are for normal stereo or monaural audio output, and the fourth and fifth speakers are used. Speakers 14A and 14B are speakers for audio output in opposite phases for reducing sounds other than programs viewed by the viewer.

  The operation button 15 includes a power button, a volume adjustment button, a channel selection button, a mode setting button, a distance setting button, and the like, and can be operated by the user.

(Circuit configuration of broadcast receiver)
FIG. 2 shows a circuit configuration of the broadcast receiving apparatus. The broadcast receiving apparatus 1 is mainly configured by a main control unit 21 configured with a CPU and the like. The main control unit 21 includes a receiving unit 22 that receives radio waves from a broadcasting station via an antenna 21, A remote control receiver 23, a display controller 24, a position detection amplifier 25 to which a microphone 26 is connected, and an audio output unit 5 are connected. Here, the main control unit 21 and the display control unit 24 constitute display means.

  The main control unit 21 includes a CPU, a ROM, and the like. The main control unit 21 performs overall control and management in the network-compatible TV 5 according to a program stored in the ROM, and selects a program based on the operation content of the remote controller 2. It has a circuit configuration for executing volume adjustment and the like.

  The receiver 22 includes at least two tuners that receive broadcasts such as VHF bands, UHF bands, and satellite broadcast bands, and each circuit has a circuit configuration that generates a video signal and an audio signal.

  The remote control receiving unit 23 includes an infrared transmission circuit that demodulates the optical signal from the remote control 2 to generate an operation signal and outputs the operation signal to the main control unit 21. In addition, the remote control receiving unit 23 is configured to output information related to the distance between the front surface of the broadcast receiving device 1 and the viewers 18 and 19.

  The display control unit 24 has a circuit configuration for driving the display 12 by a video signal from the receiving unit 22.

  The position detection amplifier 25 is a circuit that amplifies the sound from the microphone 26 and outputs a position detection audio signal to the main control unit 21.

(Configuration of audio output unit)
The audio output unit 5 includes a left audio amplifier 51, a right audio amplifier 52, antiphase generation circuits 53 and 54, delay circuits 55 and 56 as first and second delay circuits, and output amplifiers 57 to 60. Has been.

  The left audio amplifier 51 and the right audio amplifier 52 have the same circuit configuration, and are circuits that individually amplify analog left and right audio signals to a predetermined level.

  The reverse phase generation circuits 53 and 54 have the same circuit configuration, and have a circuit configuration that generates a signal having a phase difference opposite to (180 degrees) from the waveform phase of the audio signal output to the delay circuits 55 and 56. .

  The output amplifiers 57 to 60 have the same circuit configuration. The output amplifiers 57 and 58 power-amplify the audio signals from the left and right audio amplifiers 51 and 52 to drive the first and second speakers 13A and 13B. The output amplifiers 59 and 60 are circuits that amplify the audio signals from the delay circuits 55 and 56 and drive the third and fourth speakers 14A and 14B.

  The delay circuits 55 and 56 are configured so that the audio signals generated by the anti-phase generation circuits 53 and 54 have a phase difference of 180 ° with respect to the audio signals from the left and right audio amplifiers 51 and 52. , 54 is a circuit configured to delay the audio signal.

(Broadcast receiver operation)
FIG. 3 shows the directionality of the sound output of the speaker in the broadcast receiving apparatus. The operation of the broadcast receiving apparatus 1 will be described with reference to FIGS. Note that it is desirable for the viewer 18 to view the broadcast receiver 1 on the extension line of the first speaker 13A and the viewer 19 on the extension line of the second speaker 13B.

  As shown in FIG. 1, when two viewers 18 and 19 view different programs with the broadcast receiving apparatus 1, the remote control 2 is operated to set the two-screen display mode, and the viewers 18 and 19 view the program. Select the program (channel) you want. By this operation, the radio wave of the selected program is received by the receiving unit 22, demodulated into a video signal and an audio signal for each program, and each signal is output to the main control unit 21.

  The main control unit 21 sends the video signals of the two programs processed by the receiving unit 22 to the display control unit 24, and displays the screens 16 and 17 of the two programs on the display 12 as shown in FIG. 2 screen. On the other hand, the audio signal of the two programs is applied by the main control unit 21 to the audio signal corresponding to the first screen 16 to the left audio amplifier 51, and the first speaker 13A is driven by the output amplifier 57. The audio signal corresponding to the first screen 17 is applied to the right audio amplifier 52, and the second speaker 13 </ b> B is driven by the output amplifier 58.

  In this state, each of the viewers 18 and 19 can simultaneously hear the sound of two programs (including music, etc., hereinafter referred to as sound), and it is difficult to distinguish the sound of the program to be viewed. Therefore, a voice interference prevention mode is set in which the viewers 18 and 19 can hear only the voice corresponding to the front screen. The audio interference prevention mode is set by either the viewer 18 or 19 operating the remote control 2 or the operation button 15.

  After setting the audio interference prevention mode, the user operates the operation button 15 or the remote controller 2 to set the distance between the broadcast receiving apparatus 1 and the viewers 18 and 19. When the remote controller 2 is used, after the distance setting button is pressed, one of the viewers 18 and 19 strikes once. This sound is collected by a microphone built in the remote controller 2, and the detection signal is converted into an optical signal at the timing of the sound generation, and transmitted from the remote controller 2 to the broadcast receiving apparatus 1. At the same time, the clapping sound is collected by the microphone 26 of the broadcast receiving apparatus 1. When the listening positions of the viewers 18 and 19 are different from the front surface of the broadcast receiving apparatus 1, each of the viewers 18 and 19 operates the remote controller 2 and sets the distance by tapping their hands.

  The broadcast receiving apparatus 1 measures the time from the reception timing of the signal related to the distance from the remote controller 2 to the time when the sound that the microphone 26 hits the hand is collected by the main control unit 21, and this is measured by the broadcast receiving apparatus 1. A delay time td corresponding to the distance between the front and the viewers 18 and 19 is set. When the viewers 18 and 19 individually set the distance, the delay time td corresponding to each is set.

  In the broadcast receiving apparatus 1, audio signals having phases different by 180 ° with respect to the audio signals output to the output amplifiers 57 and 58 are generated by the anti-phase generation circuits 53 and 54 and output to the delay circuits 55 and 56. The delay circuits 55 and 56 output the audio signals from the antiphase generation circuits 53 and 54 to the output amplifiers 59 and 60 with a delay of the delay time td. When there are two delay times td, the delay times td are individually set in the delay circuits 55 and 56.

  The sound output of the third speaker 14 </ b> A driven by the output amplifier 60 is radiated from the lower side of the first speaker 13 </ b> A driven by the output amplifier 57. Since the sound from the second speaker 13B is 180 ° out of phase with the sound from the third speaker 14A, the sound is canceled by the third speaker 14A. The sound on the 17th side is reduced, and the sound of the first speaker 13A can be heard well.

  On the other hand, the sound output of the fourth speaker 14B driven by the output amplifier 59 is radiated from the lower side of the second speaker 13B driven by the output amplifier 58. Since the sound from the first speaker 13A is 180 ° out of phase with the sound from the fourth speaker 14B, the sound is canceled by the fourth speaker 14B, and the viewer 19 receives the left sound, that is, the first screen. The sound on the 16th side is reduced, and the sound of the second speaker 13B can be heard well.

  Thus, as shown in FIG. 3, the first sound field 3 is formed for the viewer 18 and the second sound field 4 is formed for the viewer 19. In addition, after setting the distance between the broadcast receiving apparatus 1 and the viewers 18 and 19, even if moving backward from the initial position, resetting of the distance is almost unnecessary.

(Effect of embodiment)
According to the present embodiment, the following effects are obtained.
(A) Even when the viewers 18 and 19 individually view each of the multi-screens (first and second screens 16 and 17) on the display 12, a sound field is formed for each program and the audio is viewed. The viewers 18 and 19 can enjoy the program without being disturbed by the sound of other programs.
(B) If the distance is set for each of the viewers 18 and 19, the optimum mute can be obtained for each viewer.

  In the above embodiment, the distance from the viewer to the speaker is determined by operating the remote controller 2 or the operation button 15. However, the broadcast receiving apparatus 1 is equipped with an ultrasonic distance sensor or the like, and is regularly provided. The position and distance of the viewer may be measured, and the delay times of the delay circuits 55 and 56 may be updated.

[Other embodiments]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from or changing the technical idea of the present invention. For example, the left and right speakers 13A and 13B can be configured as a multi-speaker composed of two or more such as a tweeter, a squawker, and a woofer. Furthermore, although the third and fourth speakers 14A and 14B are disposed below the first and second speakers 13A and 13B, they may be disposed in the opposite directions or may be disposed sideways. .

It is a block diagram which shows the outline of the broadcast receiver which concerns on embodiment of this invention. It is a block diagram which shows the circuit structure of a broadcast receiver. It is explanatory drawing which shows the directionality of the sound output of the speaker in a broadcast receiver.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Broadcast receiver 2 Remote control 3 1st sound field 4 2nd sound field 5 Audio | voice output part 12 Display 13A 1st speaker 13B 2nd speaker 14A 3rd speaker 14B 4th speaker 16 1st screen 17 Second screen 18, 19 Viewer 21 Main control unit 22 Receiving unit 23 Remote control receiving unit 24 Display control unit 25 Position detection amplifier 26 Microphone 51 Left audio amplifier 52 Right audio amplifier 53, 54 Reverse phase generation circuit 55, 56 Delay Circuit 57-60 Output amplifier

Claims (7)

Display means for displaying an image of the first broadcast program on the left side and displaying the second broadcast program on the right side;
A first speaker for outputting a first sound of the first broadcast program;
A second speaker for outputting a second sound of the second broadcast program;
The output level of the first sound is set higher than the output level of the second sound at the left front side of the display means, and the output level of the second sound is set to the output level of the first sound at the front right side of the display means. A broadcast receiving apparatus comprising control means for making the output level higher than the output level. The first speaker includes a first main speaker that outputs the first sound and a first auxiliary speaker that cancels the second sound,
The broadcast reception according to claim 1, wherein the second speaker includes a second main speaker that outputs the second sound and a second auxiliary speaker that cancels the first sound. apparatus.   The control means reverses the phase of the audio output of the first auxiliary speaker and the second main speaker, and reverses the phase of the audio output of the second auxiliary speaker and the first main speaker. The broadcast receiving apparatus according to claim 2, wherein: The control means has a predetermined delay amount in the audio signal of the first auxiliary speaker according to the distance between the first auxiliary speaker and the second main speaker and the predetermined position in front of the left side of the display means. And grant
Giving a predetermined delay amount to the audio signal of the second auxiliary speaker according to the distance between the second auxiliary speaker and the first main speaker and a predetermined position in front of the right side of the control means. The broadcast receiving apparatus according to claim 2.   The control means sets the sound output level of the second speaker at a predetermined position in front of the left side of the display means so that it cannot be heard, and the control means sets the first speaker at a predetermined position in front of the right side of the display means. 2. The broadcast receiving apparatus according to claim 1, wherein the audio output level is set to a level at which it cannot be heard.   The control means measures the distances from the first and second speakers to the predetermined positions in the left front and the right front of the display means, and determines the predetermined delay amount according to the distances. The broadcast receiving apparatus according to claim 4, wherein   The broadcast receiving apparatus according to claim 6, wherein the control unit measures the distance based on an arrival time at which the sound generated at the predetermined position reaches the vicinity of the display unit.