JPH07107599A - Headphone receiver - Google Patents

Abstract

PURPOSE:To reduce the sense of isolation due to mounting the headphone and to obtain the natural sound image by providing a microphone so that the proper surrounding sound can be received at the same time. CONSTITUTION:In the DM6, for example, a pair of microphones are provided at the same relational position as man's and are arranged near the listener. The surrounding sound collected by the microphones 7L and 7R is outputted and is received by frame transmission transducers 10L and 10R by a listener 12 with a headphone 9 mounted. Thus, an original sound signal is accepted through the sound image location processing by superimposing circuits 3L and 3R and the proper surrounding sound is collected by the microphones 7L and 7R. Thus, the sense of isolation due to mounting the headphone 9 can be reduced and the natural sound image can be obtained by giving the mental state of no-headphone like a speaker system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headphone listening device for obtaining a sound image image equivalent to that when a two-channel acoustic signal is received by a headphone by a speaker system.

[0002]

2. Description of the Related Art Ordinary stereo or monaural signal sources are generally produced for the purpose of listening to a speaker system, except for special recording signals from a dummy head microphone or the like. Therefore, it is originally not suitable for listening through headphones. In fact, if a stereo or monaural signal is directly guided to a pair of headphone acoustic transducers and listened to, a very unnatural sound image (a sound image stays in the head or clings to the vicinity) is obtained. Therefore, in order to avoid such an auditory phenomenon, it has been considered to preliminarily add electrical signal processing to a stereo or monaural signal assuming a sound reproduction state by a speaker system.

The purpose of the method is to electrically simulate the acoustic transmission system from the speaker system to the positions of both ears of the listener to reproduce the sound pressure and phase supplied to both ears during headphone reproduction. It is to be the same (equivalent) as time. A correction circuit for such signal processing is disclosed in, for example, Japanese Patent Laid-Open No. 56-67,000,
No. 2-145900, No. 3-90200,
It is disclosed in gazettes such as Japanese Utility Model Publication No. 4-80200.

[0004]

By the way, as is well known, a room has a sound field diffused over a wide area. The listener is exposed to a large number of sound sources and spatial sound in a diffuse sound field. First, a first sound image is basically formed by direct sound, and then a sound image diffused by reverberant sound is formed. That is, the sound image of the direct sound is absorbed in the sound image of the reverberant sound as if it disappears into the space. Therefore, it is understood that not only the sound image by the direct sound but also the diffused sound image is necessary for the sound image localization. In addition, when entering a sound field like an indoor space, the listener generally immediately recognizes whether the room is
Has a conceptual impression of size and other characteristics.
This conceptual impression is called a spatial impression, and this spatial impression is clearly created by listening to the sound of the space.

Therefore, according to the conventional headphone listening device, when the headphone is worn, it is disconnected from the surroundings, and the ambient sound in the space cannot be heard. Therefore, the listener forms a psychologically uncomfortable spatial impression due to the difference between the visual impression and the auditory impression of the spatial impression of the room. Therefore, due to the difference between the information obtained from the visual sense and the information obtained from the auditory sense, the idea that the information obtained from the auditory sense is incorrect occurs. Therefore, for example, even if a sound image localized sound signal is given and the sound image is actually localized to the listener, the localized sound image cannot be obediently accepted. Further, the sense of disconnection from the surroundings due to wearing the headphones gives a feeling of fatigue to the auditory mechanism and nerves, and is likely to give a psychological state (a feeling of strangeness) different from the reproduction by the speaker system. As described above, according to the conventional headphone listening device, there is a problem that a natural sound image cannot be obtained (the out-of-head localization feeling of sound is insufficient) due to the feeling of disconnection from the surroundings by wearing the headphone. It was

Therefore, the present invention has been made by paying attention to the above-mentioned points, and the acoustic original signal is arithmetically processed to be listened to, and at the same time, an appropriate ambient sound is also listened to, so that the surroundings by wearing the headphones are provided. It is an object of the present invention to provide a headphone listening device that reduces a feeling of disconnection from the sound and obtains a natural sound image (sufficient out-of-head localization of sound).

[0007]

A headphone listening apparatus according to the present invention is provided with a convolution circuit for calculating a transfer function at a listening position in an audio signal transmission system, and an output of the convolution circuit is received by the headphones. An apparatus, comprising a microphone for capturing ambient sound and means for listening to the sound captured by the microphone, wherein the output of the convolution circuit and the sound captured by the microphone are simultaneously listened to. It achieves the purpose.

A headphone listening apparatus having a convolution circuit for calculating a transfer function at a listening position in an audio signal transmission system, which includes a microphone for capturing ambient sound, an output of the convolution circuit, and the microphone. The above-mentioned object is achieved by providing a mixing means for mixing the sound and the output of the mixing means with the headphones.

Further, in the headphone listening apparatus as described above, the microphone is attached to the headphone to achieve the above object.

[0010]

Embodiments of the headphone listening apparatus of the present invention will be described below with reference to the accompanying drawings. First, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a first embodiment of a headphone listening device according to the present invention. In the figure, 1 is a headphone listening device, 2 is an input terminal for an original acoustic signal, 3L is a convolution circuit for an L channel signal, 3R is a convolution circuit for an R channel signal, 4L,
4R is a D / A converter, 5L and 5R are amplifiers, 6 is DM
(Dummy head recording microphone), 7L and 7R are microphones, 8L and 8R are microphone amplifiers, 9 is headphones, 10L and 10R are bone conduction transducers, and 11
L and 11R are headphone speakers, and 12 is a listener.

An original digital audio signal (monaural signal), which is the object of signal processing capable of controlling the sound image localization of the audio signal, is convolved via the input terminal 2 with the convolution circuits 3L, 3L.
When supplied to R, D / A converters 4L and 4R, amplifier 5
The sound image-localized acoustic signal is output to the headphone speakers 11L and 11R of the headphone 9 via L and 5R. On the other hand, DM6 is, for example, a pair of microphones 7.
L and 7R are provided just like the positional relationship of both ears of a human being, and are placed near the listener. Then, the ambient sounds picked up by the microphones 7L, 7R are output, and, for example, the bone conduction transducers 10L, 1 to the listener 12 wearing the headphones 9 via the microphone amplifiers 8L, 8R.
It is heard by the 0R.

In the convolution circuits 3L and 3R, for example, the filter coefficient for localizing the sound image in an arbitrary direction on the horizontal plane is set. That is, for example, the microphone 7 of the DM 6 by the actual sound source at a certain position with respect to the position of the DM 6
The measured and calculated filter coefficient is set so that the impulse responses of L and 7R and the impulse responses of the microphones 7L and 7R of DM6 when the headphones are attached to DM6 are substantially matched (the degree of correlation is almost 1). To be done. or,
A DSP is specifically used for the convolution circuit, and convolution is performed by the filter provided therein.

Here, the bone conduction transducer 10L,
It is considered that the ambient sound is mixed into the sound signal subjected to the sound image localization processing via 10R, which causes a problem, but normally, the listener 12 can obtain only the necessary sound by acquiring and selecting. Yes, it is well known that this is commonly referred to as the cocktail effect, so that such contamination does not hinder the sound image localization of the acoustic signal, but in some cases the level of contamination is Can be controlled appropriately.

It should be noted that any ambient sound may be collected by using a microphone provided just like the positional relationship between human ears. For example, a microphone is provided near the outside of a headphone speaker to collect ambient sound. You may make it sound. Further, the means for allowing the listener to hear the ambient sound is not limited to the bone conduction transducer, and may be, for example, a speaker, and a headphone speaker that outputs an acoustic signal and another headphone speaker that outputs the ambient sound should be provided inside the headphones. You may

As described above, according to the first embodiment of the present invention, the original acoustic signal is subjected to sound image localization processing by the convolution circuits 3L and 3R and is received, and an appropriate ambient sound is given to the microphones 7L and 7R. Since the sound can be picked up and listened to by the headphones, the feeling of disconnection from the surroundings due to wearing headphones can be reduced (contributes to the formation of a spatial impression), and a headphone-like psychological state equivalent to that of a speaker system can be given to create a natural sound. Of the sound (sufficient out-of-head localization of the sound) can be obtained, and at the time of listening, there is an advantage that it is kind to the auditory mechanism and nerves (no fatigue).

Next, a second embodiment of the present invention will be described with reference to FIG. It should be noted that the same reference numerals are used for the same or corresponding components as in the first embodiment of the present invention described above, and the description thereof may be omitted. FIG. 2 is a block diagram showing a second embodiment of the headphone listening device according to the present invention. In the figure, 20 is a headphone listening device, 2
2 is an input terminal for the original acoustic signal, 23L and 23R are adders,
Reference numeral 24 is a headphone, 25L and 25R are headphone speakers, 26L and 26R are microphones, and 27L and 27R are delay circuits.

The input terminal 22 of the headphone listening device 20
The monaural digital audio original signal supplied to the convolution circuits 3L and 3R via the sound source is subjected to sound image localization processing and input to the adders 23L and 23R via the D / A converters 4L and 4R. The headphones 24 include the headphone speaker 2
A pair of left and right microphones 26 near the outside of the 5L and 25R
L and 26R are installed, the ambient sound is picked up in conjunction with the movement and rotation of the listener's head, and the delay circuit 27L,
27R, adder 23 via microphone amplifier 8L, 8R
Input to L and 23R. In the adders 23L and 23R, the acoustic signals subjected to the sound image localization processing and the ambient sound are appropriately added, and the headphone speaker 2 is output via the amplifiers 5L and 5R.
It is supplied to 5L and 25R. Here, the delay circuit 27L,
27R prevents howling from occurring.

As described above, according to the second embodiment of the present invention, the acoustic original signal is subjected to sound image localization processing by the convolution circuits 3L and 3R, and a suitable ambient sound is provided to the pair of headphones 24. Since the microphones 25L and 25R can collect and add the sound, it is possible to reduce the feeling of disconnection from the surroundings by wearing the headphones (contribute to the formation of a spatial impression), and to provide a headphone-less psychological state equivalent to that of the speaker system. As a result, an image of a natural sound (sufficient out-of-head localization of the sound) can be obtained, and at the same time, there is an advantage that it is kind to the hearing mechanism and nerves (not fatigued) when listening.

The signal processing may be added with a sound image expansion processing. The ambient sound may be collected not only by the above-described means but also by a pair of microphones, or by a plurality of pairs of microphones. Further, the headphones may be of an inner ear type.

[0020]

As described above, according to the headphone listening apparatus of the present invention, since the feeling of disconnection from the surroundings due to wearing of the headphones is reduced, the headphone-less psychological state equivalent to that of the speaker system is provided. An image of natural sound (sufficient out-of-head localization of sound) can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a headphone listening device according to the present invention.

FIG. 2 is a block diagram showing a second embodiment of the headphone listening device of the present invention.

[Explanation of symbols]

1,20 Headphone listening device 3L, 3R Convolution circuit 7L, 7R, 26L, 26R Microphone 9,24 Headphones 10L, 10R Bone conduction transducer (means for listening to sound captured by microphone) 23L, 23R Adder (mixing means)

Claims (3)

[Claims] 1. A headphone listening device in which a convolution circuit for calculating a transfer function at a listening position is provided in an audio signal transmission system, and an output of the convolution circuit is listened to by a headphone. A headphone listening apparatus comprising: a unit configured to receive a sound captured by the microphone, wherein the output of the convolution circuit and the sound captured by the microphone are simultaneously listened to. 2. A headphone listening device having a convolution circuit for calculating a transfer function at a listening position in an audio signal transmission system, comprising: a microphone for capturing ambient sound; and an output of the convolution circuit and the microphone. A headphone listening apparatus, comprising: a mixing unit configured to mix a sound that is generated with the head unit, and the output of the mixing unit is received by a headphone. 3. The headphone listening apparatus according to claim 1, wherein the microphone is attached to the headphone.