JPS606155B2 - acoustic signal reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an audio signal reproducing device using headphones that allows the user to listen to sound in a state extremely similar to that obtained by emitting sound from a speaker device into a natural space. .

When listening to stereo sound, it is desirable to reproduce the stereo signal with a speaker device and radiate the sound into a natural space to create an acoustic condition, but in ordinary homes, stereo sound reproduction using a speaker device is not satisfactory due to the surrounding environmental conditions. There are many things.

If the stereo sound reproduction using the speaker system is not satisfactory for the reasons mentioned above, stereo sound reproduction using headphones may be considered.However, as is well known, when listening with headphones, the reproduced sound image is It feels like it is located in the forehead of the person (being in the head).This is called the lateralization effect.This lateralization effect causes significant discomfort to the listener, so when playing stereo sound with headphones, However, it is necessary to improve the sound image so that the sound image spreads in front of the listener, as when playing stereo sound using a speaker device.

Therefore, several methods have been proposed to reduce the above-mentioned lateralization effect and enable listening similar to that of a speaker device.

For example, means for obtaining a directional detection signal related to head movement with respect to an arbitrary reference direction, means for controlling the time difference and bell of each channel signal applied to the headphones using the directional detection signal, and A method has been proposed that includes means for combining different channel source signals with each of the channel signals and applying the synthesized signal to the left and right sides of the headphone, respectively.

If such a stereo sound signal reproducing device is used, it becomes possible to reproduce stereo sound under conditions similar to those of a speaker device.

However, the above-mentioned stereo sound signal reproduction method using headphones that has been proposed in the past has an extremely complicated structure and includes various problems that must be solved in terms of commercialization.

In view of the above-mentioned points, the present invention provides a signal input circuit of a headphone that receives a binaural signal or a signal equivalent thereto as an input signal, and includes a delay circuit that is controlled by a control signal related to the horizontal rotational movement of the head. It is an object of the present invention to provide an acoustic signal reproducing device that can reduce the lateralization effect and provide listening similar to that of a speaker device. Embodiments of the present invention will be described below based on the drawings.

First, as a means for detecting horizontal rotational movement of the listener's head in the left or right direction with respect to an arbitrary reference direction and obtaining two control signals related to the horizontal rotation direction, for example, In order to detect changes in the horizontal rotational movement of Detects horizontal rotational movement of the lion's head to the left or right, and generates two control signals related to the horizontal rotational movement, i.e., horizontal rotational movement of the head to the left with respect to the median plane. A control signal 4 related to the movement of the head and a control signal 5 related to the horizontal rotational movement of the head rightward with respect to the median plane are obtained.

Delay devices 6 and 7 whose time difference is varied by the two control signals 4 and 5 are provided on lines 8 and 9 through which binaural signals or signals equivalent thereto are transmitted.
The variable delay devices 6 and 7 can be considered to be mechanical delay device control or electrical delay time control. Further, the time difference that the variable delay device 6.7 gives to the binaural signals or equivalent signals transmitted through the lines 8 and 9 must be set in advance to have the characteristics shown in FIG. That is, the time difference characteristic b, which is emphasized at least twice as much as the time difference characteristic a that occurs between both ears in relation to the direction of incidence of sound at the real head, can be given to the binaural signal or a signal equivalent thereto. There is. Further, the time difference has a characteristic that the closer it is to the median plane of the head, the more steeply the change can be made. If the delay device satisfies the above-mentioned conditions, reproduction similar to that achieved by a speaker device can be achieved even when using only one pair of headphones.

Therefore, the present invention provides means for detecting the direction and magnitude of head movement with respect to an arbitrary reference direction and obtaining a control signal depending on the interlocking direction and magnitude, and a binaural signal or an equivalent signal to be applied to headphones. In an audio signal reproducing apparatus, the acoustic signal reproducing apparatus includes a delay device that provides a time difference between the delay devices and a means for changing the signal delay time of the delay device in accordance with the control signal. Since the condition of characteristic curve b, which indicates the relationship between the time difference occurring between both ears, is satisfied, it is possible to listen to the reproduced sound through headphones in a state similar to that when the sound is reproduced by a speaker device, without being affected by the surrounding environment. becomes possible. Furthermore, unlike conventionally proposed acoustic signal reproducing devices, it is not necessary to simultaneously satisfy the two conditions of time difference and bell difference, so the structure can be simplified. Brief Description of the Drawings Figure 1 is a block diagram showing an embodiment of the acoustic signal reproduction device according to the present invention, and Figure 2 is a characteristic diagram showing the relationship between the direction of incidence of sound and the time difference that occurs between both ears. be.

1...Supporting means, 2...Detector, 3...
...Detection ring, 4,5...Control signal detection circuit, 6,7...Delay device, 8,9...Line, 1
0...Headphones.

fu diagram 2nd figure

Claims (1)

[Claims] 1. Means for detecting the direction and size of the head movement with respect to an arbitrary reference direction and obtaining a control signal dependent on the direction and size of the movement, and providing a time difference between a binaural signal or an equivalent signal applied to the headphone. In an audio signal reproducing device comprising a delay device and means for changing the signal delay time of the delay device in accordance with the control signal, the delay device provides a time difference between binaural signals or signals equivalent thereto, which An acoustic signal reproducing device characterized in that the magnitude of the control signal is selected so as to emphasize the signal at least twice as much as the time difference between the sounds applied to both ears in accordance with the direction of incidence of the sound.