JPH01130700A - Av surround system - Google Patents

Abstract

PURPOSE:To enjoy a sound field corresponding to a TV screen by providing a sound field processor for reading a sound field switching signal recorded on a control track at the time of a reproduction and driving plural speakers. CONSTITUTION:The main speakers S1-S4 disposed on both the sides of a display device 3 are provided with the speakers S5, S6 for the sound field disposed at both the sides backward of a viewer, for instance. In VTR deck 2, a recording circuit for recording the sound field switching signal on the control track of a magnetic tape or a track capable of post recording is incorporated and the plural types of sound field switching signals for switching to the sound field according to a scene at the time of a picture recording are recorded. At the time of the reproduction, a sound signal is supplied to the sound field processor 4 through a sound signal line l2. Thereby, the sound field is automatically switched by the sound field switching signal inputted through a switching signal line l3, thereafter, amplified to a suitable level by an amplifier 5 and outputted from the speakers S1-S4 (or S1-S6).

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an AV surround system, and particularly to an AV surround system equipped with an automatic sound field setting function.

(Technical background) Due to the amazing development of electronics technology,
The rise of the AV (audio/visual) industry, which is one of its application fields, is remarkable. In Japan, there are now almost no households that do not have at least one TV (television) installed, and audio equipment such as tape recorders and even VTRs (video tape recorders) are becoming increasingly popular. In audio equipment, it is now 2 ah.
(Channel) Stereo is the norm, but T
Even in V, stereo (so-called audio multiplexing) systems are becoming increasingly popular. In response to this, VTR models with two audio tracks have been developed, making it possible to record audio multiplex programs and signals from video cameras equipped with stereo microphones.

On the other hand, in the audio field, there is something called Dolby Surround (sigma trademark), which is being implemented in recording and reproducing devices exclusively for audio. Also, left and right 2c
Attempts are being made to create a playback sound field that is even closer to the actual sound field space by increasing the number of audio channels and performing special signal recording and playback, in addition to stereophoning. Such functions and systems have not yet been introduced into video equipment.

[Prior art and its problems]

85I encoded into a Dolby surround audio signal! By playing back the software with a dedicated processor, it is possible to express movement in the front and rear directions, but it is not possible to express the sound field space such as a room or hall. In addition, although various sound field processors are available as stand-alone products, one that has the ability to replace the 1i7J in synchronization with video signals has not yet been realized. Furthermore, conventional audio multiplexing T
In V, speakers are installed on the left and right sides of a display screen such as a CRT, and if there is a sound source on the left side of the screen, the sound is emitted from the left speaker, and the sound from the sound source on the right side of the screen is emitted from the right speaker. As a result, we were able to create a certain degree of realism. However, for example, by setting a sound field mode that matches the sound field displayed on the display screen (changes such as room → outdoors → hall → church), watching TV can create an atmosphere that makes you feel as if you are actually there. I couldn't do that.

[Means for solving problems]

The AV surround system of the present invention includes a recording and reproducing device capable of recording and reproducing a sound field switching signal on a control track or a track capable of dubbing of a recording medium, and an image reproduced and demodulated from the recording medium by this recording and reproducing device. A display device that displays signals, multiple speakers that output multiple channels of audio signals that are reproduced and demodulated from a recording medium by this recording and reproducing device, and sound recorded on a control track or one rack that can be used for dubbing. By comprising a sound field processor that reads field switching No. 13 during playback and switches the sound field to a sound field according to the signal to drive a plurality of speakers, it is possible to select an appropriate sound field according to the displayed screen. We are trying to provide a new AV surround system that automatically switches to
It is something that

(Embodiment) An embodiment of the AV surround system of the present invention will be described with reference to FIG. 1 and subsequent figures. FIG. 1 is a basic system block diagram of an AV surround system 1 of the present invention, in which 2 is a VTR deck compatible with the present invention, and 3 is a display device a such as a CRT.

4 is a sound field processor, 5 is an amplifier (audio amplifier), 81
- S4 are main speakers installed on the left and right sides of the display @ position 3, and b 51 S e are speakers for a sound field installed, for example, on the rear left and right sides of the viewer.

The VTR deck 2 has a built-in recording circuit (not shown) for recording sound field switching signals on the control track of the magnetic tape used or on the track that can be used for dubbing. A sound field mode setting key group 22 is provided at a predetermined location on the operation surface 21 of (A), which records a plurality (two or more) types of sound field switching signals for switching to a sound field depending on the scene. This key group 22 (V
The TR Deck 2 can record sound field switching signals not only when recording on magnetic tape (not shown), but also on the control track of recorded software or on a track that can be used for dubbing. has been done. In addition, 2
3 is an insertion slot for inserting and ejecting a cassette tape, and Sv is a power switch.

Insert the recorded source (videotape) into slot 2
3 and press the playback key 24, the video signal among the signals recorded on the tape is demodulated by a well-known video signal processing circuit (not shown) built into the VTR deck 2, and the video signal is Display device 3 via signal line 11
The audio signal is supplied to the 7i field setter 4 via the audio signal line 12, where the sound field is automatically switched by inputting it via the VJ switching signal line 13. After that, it is amplified to an appropriate level by amplifier 5 and output to speakers S1 to S4 (or S+"S
Output from a).

Next, the sound field processor 4 which is the main part of the system of the present invention
The specific configuration, operation, etc. will be explained with reference to FIG. In this figure, at a3, In + is a digital audio signal input terminal, In 2 is an atelolog audio signal input terminal, 31 is an EIAJ format DIR (digital interface receiver), 32 is an AlO2 converter, and 33 is a DAP (digital acoustic signal input terminal).
cs Processor), which is one of the custom ICs developed by the applicant.
SP (Digital Signal Pro -
5sessor) LSI (Large scale integrated circuit)
It is. M1= , 34 is RAM
(Random A cccss M e
s+ory), 35.36 is a D/A converter, 37F, 37B is a DIT (Dioital Interfa) for front and rear digital output signals, respectively.
ce Transmitter), 38 is a DAP microcomputer, and 39 is a system microcomputer.

VR+ ”-VR5 is a variable resistor, of which VR
s~VR5 work together as a master volume. Further, Sw2 is a switch for switching between 4 ah and 6 channels, and in the illustrated state, 6 channels are reproduced. In addition, a
Since the configuration of the re-signal system is the same for both left and right channels, only one channel is shown and the other is omitted. Both digital and analog input audio signals can be used, and in the case of a digital signal, it is converted to 29s combination by DIR31 of EIAJ format, BGK (Bit C1ock), LRCK
(left/right switching clock) is input to the DAP 33. The analog audio signal is converted into a digital signal by the A/D converter 32 and sent to the DAP as 16-bit serial data.
33. DAP33 is DAP microcomputer 38
Performs digital sound field processing based on actual sound field data according to instructions from. The DAP microcomputer 38 processes signals while exchanging signals with the system microcomputer 39.
is operated by the user in accordance with an operation signal from the key(s) 22 or the remote controller 41, and drives the display 26 to display what sound field has been designated. DAP33
Location of source, direct sound.

Data and calculation formulas such as anti-oJ sound are preset,
Here, the input audio signal is subjected to a series of signal processing, and then D
/A converter 35, 36 converts it back to an analog signal and outputs it, and at the same time outputs DIT37F.

Digital signal (output as a bow) from 37B.
The digital output signal is used to supply a DAT (digital audio tape) recorder or an amplifier device with a built-in D/A converter.

Next, using the AV surround system 1 of the present invention,
CTL (control) of video tape, which is a recording medium
An example of a method for recording a switching signal on a track will be described. Among the current videotape recording formats, VASS (Video Address 3ea
rch System): There is quite a bit of leeway in the L-D, so it is most desirable to record it during this VASS mailing month. As an example, if 4 bits are used for the switching signal, it becomes possible to switch between 16 types of sound fields. Also, V A
S S (The i Q can also record on commercially available pre-recorded tapes (those with folded tabs to prevent erasure), so the user can change the sound field of their choice to suit the situation by switching signals. It is also possible to record. Therefore, V
By attaching a terminal for reading and outputting the ASS signal to the VTR deck and equipping the sound field processor 41111 with an input terminal for it, the sound field processor 4 automatically switches the sound field pattern (speakers S1 to S54 (88) The optimum sound field is
It is better to configure it so that

As an example of an optimal sound field, in the case of an outdoor scene such as that displayed on the TV screen (display device) 3 in Fig. 1, sound should be emitted from all speakers, and the sound source (for example, a locomotive) The sound of running) is output from the speakers at each position at an appropriate rate according to the movement of the running sound.
Each speaker from the front left to the rear left), and the sound field may be set such that the reflected sound is an echo from the mountains in front, etc.

In the above explanation, the sound field processor 4 is described as a separate unit, but it may also be incorporated into the VTR deck 2, and the recording/reproducing media are magnetic tapes and VTRs, but are not limited thereto. A sound field switching signal may be recorded in advance at the time of creation), a magnetic disk, etc., and the playback device is not limited to a video deck, but may also be an audio disk including a video disk player, a magnetic recording/playback device, etc.

(English) Since the AV surround system of the present invention is configured as described above, you can enjoy viewing images on a TV screen, etc., and the audio can be heard regardless of the size of the room in which you are viewing. It has the feature and effect that it can be viewed in a sound field suitable for the scene on the V screen.

[Brief explanation of the drawing]

FIG. 1 is a basic block diagram of the AV surround system of the present invention, and FIG. 2 is a block diagram of the sound field processor, which is the main part of the system of the present invention. 1...AV surround system, 2...VTR
deck, 3... display device, 4... sound field processor,
5... Amplifier, 22... Key group, 24... Playback key, 31... DIR, 32... A/D converter, 33
...DAP134...RAM, 35.36...D
/, A converter, 37F, 37B...DIT, 38
...DAP microcomputer, 39...system microcomputer,
In + ~ In 2... Input terminal 'f, S + ~ S6
...Speaker, Sv2...4ch-6ch switching switch, VR1-VR5...variable resistor.

Claims (1)

[Claims] A recording and reproducing device capable of recording and reproducing a sound field switching signal on a control track or a track capable of dubbing of a recording medium, and a display device that displays a video signal reproduced and demodulated from the recording medium by the recording and reproducing device. and a plurality of speakers that output multi-channel audio signals reproduced and demodulated from the recording medium by the recording and reproducing device, and reproducing the sound field switching signal recorded on the control track or the track capable of dubbing. 1. An AV surround system comprising: a sound field processor that reads the signal and switches to a sound field according to the signal to drive the plurality of speakers.