JPH11113084A - Sound recording apparatus having stereophonic sound recording function and method thereof - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a sound recording apparatus having a three-dimensional sound recording function and a method thereof. An audio recording device includes: an audio input unit; an audio localization unit that separates and modulates a sound input through the input unit so as to exhibit a three-dimensional sound effect;
A recording unit that records the stereophonic sound output from the acoustic localization unit. Thus, by applying the sound localization processing to the sound recording device, the sound reproduction device including the two-speaker audio system can hear the stereophonic sound without any additional device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound recording apparatus having a three-dimensional sound recording function, and more particularly, to a sound reproducing apparatus comprising a two-speaker audio system for realizing a three-dimensional sound effect through three-dimensional sound source diffusion. The present invention relates to a sound recording apparatus having a three-dimensional sound recording function capable of recording an input sound signal on a sound recording medium after sound localization, and a method thereof.

[0002]

2. Description of the Related Art Stereophonic sound refers to a sound having spatial diffusion.
Is a sound that corresponds to monophonic sound recorded by two microphones and gives a three-dimensional effect to the auditory sense through the diffusion of a three-dimensional sound source. The sound recorded in two or more channels is reproduced to give a sense of direction to the sound. It gives a sense of perspective and exhibits the effect of three-dimensional sound. Normally, a stereo record, a stereo tape, and a stereo broadcast give a three-dimensional effect to two channels, but it is desirable to use three or more channels in order to exhibit more effective three-dimensional sound effects.

[0003] A sound recording device is a sound obtained from nature,
This is a device for recording the sound reproduced from the sound recording medium or the sound received from the broadcasting station on the sound recording medium, and is referred to as a cassette recorder, a camcorder or the like. Meanwhile, 2
-A sound reproducing device comprising a speaker audio system is provided with left and right output speakers, and reproduces a sound signal recorded on a sound recording medium or a sound signal received from a broadcasting station, such as a cassette player or a television receiver. . In particular, the stereophonic sound recording device and the stereophonic sound reproducing device record and reproduce the recorded and reproduced sound in two or more channels.

[0004]

SUMMARY OF THE INVENTION The present invention applies a sound localization device to a sound recording device and records the sound localized in a sound recording medium, so that a general sound reproducing device can be used without any additional device. A first object is to provide a sound recording apparatus having a three-dimensional sound recording function capable of listening to a sound whose sound has been localized, and a second purpose is to provide a three-dimensional sound recording method.

[0005]

According to the first aspect of the present invention, there is provided a sound recording apparatus comprising: a sound input unit;
The sound input through the sound input means, a sound localization unit that separates and modulates a sound source so as to exhibit a three-dimensional sound effect, and a recording unit that records the three-dimensional sound output from the sound localization unit. It is characterized by including.

In order to achieve the second object, the sound recording method according to the present invention comprises a step of separating and modulating the sound input through the sound input means, and a step of separating the separated and modulated sound from the sound recording medium. Recording on the left and right sound recording channels, respectively. In the present invention, the step of separating and modulating the three-dimensional sound separates and modulates the sound according to a standard separation distance between two speakers of the sound reproducing apparatus.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the attached drawings. FIG. 1 is a diagram showing a configuration of a sound reproducing apparatus including a general two-speaker audio system. 1 includes an audio system unit 10, a left (L) speaker 12, and a right (R) speaker 14. Here, a sound reproducing device including a two-speaker audio system is combined with a sound recording device shown in Table 1 below to perform its function. That is,
A sound reproducing device that reads sound recorded on a sound recording medium and outputs the read sound to a speaker is combined with a sound recording device that records stereophonic sound on a sound recording medium as shown in Table 1 below.

[0008]

[Table 1]

A sound reproducing apparatus such as a television receiver comprising a two-speaker audio system shown in FIG. 1 uses two input means such as a camcorder, that is, a microphone, to convert external sound into three-dimensional sound on a recording medium. Combined with a sound recording device for recording. That is, an audio recording device such as a camcorder is connected to an audio reproducing device such as a television receiver by a coaxial cable, and an audio signal recorded together with a video signal photographed by the camcorder is transmitted by an audio reproducing device such as a television receiver. Will be played.

A sound recording device such as a camcorder that records stereophonic sound records stereophonic sound on a sound recording medium using two microphones. However, sound reproduced through a sound reproducing device such as a television receiver including a two-speaker audio system cannot exhibit the effect of stereophonic sound recorded on a sound recording medium as stereophonic sound. This is because the effect of separating stereophonic sound at the time of recording is small, and the separation distance of the 2-speaker mounted on the sound reproducing device is so narrow that the effect of separating stereophonic sound reproduced from the sound recording medium cannot be exhibited.

[0011] Therefore, in order to solve the above-mentioned problems, an acoustic localization device is attached to a sound reproducing device including a two-speaker audio system. The sound localization device is mounted on a sound reproduction device composed of a two-speaker audio system, and separates standard three-dimensional sound recorded on a sound recording medium in order to efficiently produce three-dimensional sound, thereby providing three-dimensional perspective and sense of direction. An apparatus that modulates standard stereophonic sound reproduced from a recording medium so that a user can hear stereophonic sound in a three-dimensional space. That is, the effect that the separation distance between the two speakers mounted on the sound reproducing device is virtually widened can be exhibited.

Of course, as a method for realizing an effective three-dimensional sound effect, Dolby is composed of four channels: two channels for front left and right speakers, a center channel for center speakers, and a surround channel for reproducing rear signals. Surround stereophonic technology has already been put to practical use, but the scope of the present invention is to apply a sound localization technology to a sound recording device in order to exhibit a three-dimensional stereophonic effect in a sound reproducing device including a two-speaker audio system. Technology.

Accordingly, as shown in FIG. 2, the sound localization device is attached to the TV of the sound reproduction device, and the three-dimensional sound recorded on the sound recording medium is separated, modulated and reproduced.
Since the effect of widening the virtual separation distance between the two-speaker is exerted, the sound reproducing device including the two-speaker audio system can also exhibit the effect that the listener can hear with three-dimensional sound.

FIG. 2 is a diagram showing a sound reproducing apparatus including a two-speaker audio system to which a sound localization apparatus is attached. 2 includes an audio system unit 20, a left speaker 22, and a right speaker 24.
Consisting of Here, reference numerals 22 'and 24' indicate speakers having a virtual separation distance obtained by mounting the acoustic localization device.

FIG. 3 is a detailed block diagram of the audio system unit 20 shown in FIG. 2, which shows a reproducing unit 32 for reproducing an audio signal recorded on an audio recording medium 30, and a sound reproduced by the reproducing unit 32. Separate and modulate virtual speaker 22 ',
A sound localization unit 34 that produces a three-dimensional sound effect by generating an effect of a speaker separation distance such as 24 ′, and an amplifier unit that amplifies an audio signal output from the sound localization unit 34 and outputs the amplified signal to the speakers 22 and 24. (AMP) 36.

The sound reproducing apparatus comprising the two-speaker audio system shown in FIG. 2 is provided with an acoustic localization device to separate and modulate the standard stereophonic sound recorded on the sound recording medium 30 during reproduction to provide a two-speaker sound. A three-dimensional sound effect can be exhibited by achieving the effect of increasing the separation distance. However, since the sound reproducing apparatus should be equipped with another sound localization unit 34, additional hardware costs are required and the sound quality during reproduction is deteriorated.

Therefore, when another acoustic localization device is to be installed, it is necessary to carefully select a device to which it is applied. At present, in consideration of a situation in which a sound reproducing device including a two-speaker audio system is more widely used than a sound recording device capable of recording stereophonic sound, the sound localization device is more applied to the sound recording device than to the sound reproducing device. Mounting is more efficient. This is because the sound recording device equipped with the sound localization device separates and modulates the sound that is recorded so as to exhibit the stereophonic effect during reproduction, and records the sound on the sound recording medium. This is because a normal sound reproducing device that reproduces a reproduced sound signal can hear stereophonic sound without any additional device. Therefore, there is a need for a technique for attaching the sound localization device to the sound recording device or applying the sound localization device to a newly developed sound recording device.

FIG. 4 is a diagram showing a simple configuration of the sound recording apparatus. The sound recording device shown in FIG. 4 includes a recording unit 42 that records an external sound signal input via two microphones 40a and 40b on a recording medium. However, as described above, the acoustic signal recorded on the acoustic recording medium is 2-
Since the two-speaker separation distance of the sound reproduction device including the speaker audio system is short, a three-dimensional sound effect cannot be achieved.

FIG. 5 is a diagram showing a sound recording apparatus having a three-dimensional sound recording function according to the present invention. The sound recording apparatus having the three-dimensional sound recording function shown in FIG. 5 includes a left and right microphones 50a and 50b, a sound localization unit 52 that separates, modulates, and outputs a three-dimensional sound signal input via the left and right microphones 50a and 50b. An acoustic recording unit 54 records the acoustic signal processed by the localization unit 52 on an acoustic recording medium.

FIG. 6 shows another embodiment according to the present invention.
An audio localization unit 62 for separating and modulating the audio signals L and R output from the reproduction unit 60 including the speaker audio system, and recording the audio signals L ′ and R ′ output from the audio localization unit 62 on an audio recording medium. This is a sound recording device having a sound recording unit 64 that performs the recording. FIG. 7 is a diagram for explaining the stereophonic sound recording method according to the present invention. A stereophonic sound is input through two microphones (S70). The stereophonic sound input through the microphone is separated and modulated (S72).

Here, in the process of separating and modulating the three-dimensional sound, the three-dimensional sound is separated and modulated according to the standard separation distance of the two-speaker in a sound reproducing device including a two-speaker audio system. The separated and modulated sound is recorded on the left and right sound recording channels of the sound recording medium, respectively (S
74 stages).

[0022]

As described above, according to the sound recording apparatus having the stereophonic sound recording function and the method therefor according to the present invention, by applying the sound localization processing to the sound recording apparatus, it is possible to perform 2-
Even a sound reproducing device including a speaker audio system can hear stereophonic sound without any additional device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a sound reproducing device including a general two-speaker audio system.

FIG. 2 is a diagram showing a sound reproduction device including a two-speaker audio system to which a sound localization device is attached.

FIG. 3 is a detailed configuration diagram of an audio system unit shown in FIG. 2;

FIG. 4 is a diagram showing a simple configuration of an acoustic recording device.

FIG. 5 is a diagram showing a sound recording device having a three-dimensional sound recording function according to the present invention.

FIG. 6 is a diagram showing another embodiment according to the present invention.

FIG. 7 is a diagram for explaining a stereophonic sound recording method according to the present invention.

[Explanation of symbols]

 50a left microphone 50b right microphone 52 sound localization unit 54 sound recording unit

Claims (3)

[Claims] 1. A sound recording apparatus, comprising: a sound input unit; a sound localization unit that separates and modulates a sound input through the sound input unit so as to exhibit a three-dimensional sound effect; A recording unit for recording the stereophonic sound output from the localization unit, the acoustic recording device having a stereophonic recording function. 2. A sound recording method, comprising the steps of: separating and modulating three-dimensional sound input via sound input means; and recording the separated and modulated sound in left and right sound recording channels of a sound recording medium. And a three-dimensional sound recording method. 3. The stereophonic sound recording method according to claim 2, wherein the step of separating and modulating the stereophonic sound separates and modulates the sound in accordance with a standard separation distance between two speakers of the sound reproducing apparatus. .