JPH0795877B2 - Multi-dimensional sound field reproduction device - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a multi-dimensional stereophonic sound field reproducing apparatus, and particularly to reproducing a rear two-channel speaker of a four-channel stereo with headphones supported by an ear or a head. The present invention relates to a 4-channel stereo reproduction device which reproduces signals of the rear two channels by applying electrical processing.

[Technical background of the invention and its problems]

Conventionally, there are various methods for a 4-channel stereo playback device, but in order to enable sufficient 4-channel stereo playback in the same space as in the case of 2-channel stereo playback, the Japanese Patent Publication No. The stereo reproducing apparatus described in Japanese Patent No. 53-13963 has been known. That is, this stereo reproduction device is a headphone including a left speaker and a right speaker arranged in front of the listener's left front and right front, and left and right reproduction units mounted on the left and right ears of the listener and each having an acoustic conversion element. The left and right reproduction units are provided with through holes or cutouts that communicate with the outside, respectively. Through the through holes or cutouts, the left front reproduction sound and the right front reproduction sound reproduced by the left speaker and the right speaker are formed. Is transmitted to the left and right ears of the listener, and a delay device is provided in the signal path to each of the acoustic conversion elements to delay the signal supplied to the acoustic conversion elements to reproduce the reproduced sound. The reproduced sound is transmitted to the left and right ears of the listener together with the left front reproduced sound and the right front reproduced sound, and the left front reproduced sound and the right front reproduced sound are stereophonic together. It is obtained to perform the raw.

However, in the reproduction method by the stereo reproduction device described above, there is a distance difference between the reproduction sound of the front left and right speakers and the reproduction sound of the left and right speakers of the ears when reaching the ear, and it is necessary to correct it. In addition, although the delay device is arranged in the signal path of the left and right speaker of the ear, there is a drawback that the polarity of each signal of the left and right speaker of the ear cannot be switched and the phase cannot be shifted.

[Object of the Invention]

This invention has been made to eliminate the above-mentioned conventional drawbacks, by inserting the delay processing means, the phase shifting means, and the polarity switching means in series in the signal path of the headphones on the left and right of the ear. The purpose is to enable various three-dimensional sound field reproduction by operating these independently.

〔Example〕

Hereinafter, a multidimensional sound field reproducing device of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an example thereof,
In the figure, 10 is a stereo listener and 11 is a listener.
A left channel speaker arranged in front of the left side of 10 and a right channel speaker 12 arranged in front of the listener 10 on the right side. Reference numeral 13 is a driver unit for the left ear of the headphones attached to the listener 10, and 14 is a driver unit for the right ear. The headphones having the driver units 13 and 14 for the left and right ears are arranged at a position slightly apart from the listener 10, and the listener 10 has the driver units for the left and right ears.
The reproduced sound from the left and right channel speakers 11 and 12 arranged in the front can be heard together with the reproduced sound from the sound sources 13 and 14. Reference numeral 15 is an audio amplifier having a 4-channel signal output terminal, 16 and 17 are delay processing devices for delaying left and right rear signals, and 18 and 19 are switching between processing with the signal 16 and passing. It is a device. By the delay processing devices 16 and 17 and the switching devices 18 and 19, there is provided delay processing means for performing delay processing on a signal and capable of selecting whether to perform delay processing on the signal or not. Composed. 20 and 21 are phase shifters that shift the phase to the left and right rear signals.
Is a switching device that switches between processing the input signal at 20 and passing it. A phase shift processing means for shifting the phase of the input signal by the phase shift devices 20, 21 and the switching devices 22, 23, and selecting whether to perform the phase shift or not To be done. Reference numeral 24 is a polarity switching device that switches the polarity of the input signal and the right ear driver unit 14, and 25 is a polarity switching device that switches the polarity of the input signal and the left ear driver unit 13. Reference numerals 26 and 27 are volume control volumes for adjusting the left and right rear signals, respectively.

Next, the operation of the present invention will be described. Front left and right channel signals produced by audio amplifier 15
L _F and R _F are supplied to the front left and right channel speakers 11 and 12 to be reproduced, and rear left and right channel signals L _B and R _B are delayed by the switching devices 18 and 19, respectively.
Input to 16,17. The rear left and right channel signals L _B and R _B processed by the delay processing devices 16 and 17 are then respectively transferred to the switching device 2
It is input to the phase shifters 20, 21 via 2, 23, adjusted to a predetermined phase, and input to the polarity switching circuits 24, 25. The outputs of the polarity switching devices 24 and 25 are adjusted in volume by the volume adjusting volumes 26 and 27, and then input to the left and right ear driver units 13 and 14 constituting headphones, respectively, to reproduce the reproduced sound to the listener 10.

In this way, the front left and right channel signals L _F , R _F of the audio amplifier 15 are reproduced by the left and right channel speakers 11 and 12,
Delay treatment devices 16 and 17, phase shift devices 20 and 21, and a polarity switching device that are provided with rear left and right channel signals in their signal paths.
Listener 1 by freely processing signals by 24, 25
With 0, the reproduced sounds can be heard together as 4-channel stereo from the headphones of the front left and right channel speakers 11 and 12 and the headphones of the left and right ear driver units 13 and 14.

Here, by shifting the signal phase of the phase shift device 20, 21 by the switching device 22, 23, the driver unit for the left and right ears 1
Intracranial localization of 3,14 reproduced sounds can be relaxed. It is also possible to increase the feeling of expansion around the head by using the polarity switching device to make the phases of the rear left and right signals input to the left and right driver units 13 and 14 opposite to each other. Further, when delay processing is performed on the signals using the delay processing devices 16 and 17, it is possible to increase the feeling of spread around the head. In this case, by providing a delay processing time difference between the delay processing devices 16 and 17, respectively. It is possible to further increase the feeling of lateral spread of the head.

It should be noted that although in the above-described embodiments, the description has been made for a 4-channel signal, it is also possible to use a normal 2-channel stereo signal as this signal. The left channel signal in this case two-channel stereo playback L, and right channel signal R, the output signal L _F of the audio amplifier 15 shown in FIG. 1, R _F, L _B, respectively R _B, L _F
= L, R _F = R, L _B = L−R, and R _B = L−R, the listener can hear the reproduced sound that obtains an indirect sound around the head.

〔The invention's effect〕

As described above, according to the present invention, a left channel speaker and a right channel speaker, which are arranged to the front left and right of a listener and into which a front left channel signal and a front right channel signal are input, respectively, and a rear left channel signal. Left and right 2 to which the rear and right channel signals are input respectively
Two driver units, each of the two driver units having a structure that does not acoustically block the ear canal and the external free space when worn on the left and right ears, In each of the signal paths of the driver unit, a delay processing means for delaying the signal and selectable with or without delay processing, and a phase of the input signal , And a phase transition processing means capable of selecting whether or not to perform the phase transition and a polarity switching means capable of inverting the polarity of the input signal are inserted and connected in series. Since each of the means can be operated independently, it becomes possible to freely adjust the feeling of sound spread around the head in stereo sound field reproduction. It is possible to provide an excellent multi-dimensional sound field reproducing apparatus.

[Brief description of drawings]

FIG. 1 is a block diagram showing a multidimensional sound field reproducing apparatus according to the present invention. 10 …… listener, 11, 12 …… left and right front channel speakers, 13, 14 …… left and right ear driver unit, 15 …… audio amplifier, 16, 17 …… delay processing device, 18, 19 …… switching device , 20,21 ...... Phase shift device, 22,23 ...... Switching device,
24,25 …… Polarity switching device, 26,27 …… Volume control volume.

Claims (1)

[Claims] 1. A left-channel speaker and a right-channel speaker, which are arranged on the left and right of the front of the listener and receive a front left channel signal and a front right channel signal, respectively, and a rear left channel signal and a rear right channel signal. It has two driver units on the left and right to be input,
Each of the two driver units is equipped with headphones having a structure that does not acoustically block the ear canal and the external free space when attached to the left and right ears, and the respective signals of the two driver units on the left and right of the headphones are provided. In the path, a signal is subjected to delay processing, and a delay processing means capable of selecting whether or not the signal is subjected to delay processing and a phase transition of the input signal are provided. , And a phase transition processing means that can select whether to apply the phase transition or not.
A multidimensional sound field reproducing apparatus characterized in that polarity switching means capable of inverting the polarity of an input signal is inserted and connected in series, and each of these means can be operated independently.