JPS60227599A - Stereo acoustic device - Google Patents

Abstract

PURPOSE:To give simultaneously a stereo feeling and a forward sense of a sound image to the audience by supplying collected sounds of a microphone mounted on a pseudo head to headphones of the audience and a forward speaker. CONSTITUTION:A reproduction signal from a tape recorder 5 and a signal from a tuner 11 are selected by interlocking switches 13a and 13b, supplied to headphones 4a and 4b of open air type through delay circuits 34a and 34b and amplifiers 10a and 10b, and given to an audience 6. Right and left signals at the output sides of the switches 13a and 13b are supplied to a speaker 7 through a mixer 8 and an amplifier 9. The speaker 7 is arranged forward the audience 6. By supplying collected sounds of right and left microphones 2a and 2b mounted on a pseudo head 1 to the headphones 4a and 4b and the speaker 7, a stereo feeling and a forward sense of a sound image can be obtained simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a pinaural stereo sound device.

BACKGROUND TECHNOLOGY AND PROBLEMS Generally speaking, it is possible to judge a sound image in almost all directions using a sound source consisting of signals from two left and right channels.
If you play the channel signal on a handphone, you should be able to hear a very natural stereo sound.

However, it is known from experience since birth that humans judge sounds coming from the front almost visually, and they are more sensitive to the location of the sound source when they hear a sound coming from behind than when they hear a sound coming from the front. The accuracy is high. Therefore, even if the signal recorded by the artificial bait microphone is listened to by the hesodophone, the sound image tends to move backward as a whole and cannot be obtained from the front.

OBJECTS OF THE INVENTION The present invention avoids the above-mentioned drawbacks, provides not only a stereo feeling, but also a sense of the front of the sound image, thereby achieving naturalness, and furthermore, the sound from the left and right handphones and the sound from the front sound image. By adjusting the time for each listener, the unnaturalness is further eliminated.

Summary of the Invention The present invention transmits signals obtained by left and right microphones attached to bait to a pair of left and right speakers, such as hesodophones, which are placed on either side of the listener's ears, respectively, through delay circuits. At least a signal obtained from the microphones on the left and right sides of the bait, or a signal obtained by mixing them, is supplied to the speaker to be placed in front of the pair of speakers, such as the hesodophone, in addition to being supplied independently. The above-mentioned object can thus be achieved.

EXAMPLE An example will be described below with reference to FIG. (1) is the lure, (1a) is the front side, (2a) and (2b) are the microphones, and (3a) and (3b) are the signal transmission system from the microphones. (11) is a tuner from which demodulated left and right stereo signals are obtained.

This tuner (11) and microphone (2a) (
The signal from 2b) is sent to the mutually interlocking changeover switch (12
a) (12b) and is supplied to the two-channel tape recorder (5) for recording.

The playback signal from the tape recorder (5) and the signal from the tuner (11) are transferred to the selector switch (1) which is linked to each other.
3a) (13b) and delay circuits (34a) (34b) and amplifiers (10a), respectively.
(10b) and is supplied to open-air type hesodophones (4a) and (4b). (6) is the listener. The left and right signals obtained at the output sides of the changeover switches (13a) and (13b) are mixed by a mixer (8) and supplied to a speaker (7) through an amplifier (9).

This speaker (7) is placed in front of and apart from the listener (6). Also, amplifiers (9), (10a) (1
0b) Tone control can be added to both.

Therefore, the listener (6
) The listener listens with open-air type hesodophones (4a) and (4b) placed near the listener (6), and also has a speaker (7) in front of the listener (6), so the listener can feel both the stereo and the forward feeling. Can be done.

FIG. 2 shows another embodiment, in which parts corresponding to those in FIG. 1 are designated by the same reference numerals.

In this example, when reproducing with two speakers (7a) (7b), the signals of both channels are transmitted through phase inverters (31a and 31a) respectively.
) (31b) and frequency characteristic addition circuit (32a)
(32b') through mixer (33a) (33b
) and mix it with the signal of the other channel to obtain unnatural left and right sounds from the speakers (7a) and (7b), respectively.

FIGS. 3 and 4 show still another embodiment, in which parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and their explanation will be omitted. In the example shown in Figure 3, simply the signal transmission system (3a) (3b)
This is the case where speakers (7a) and (7b) are connected to the speakers (7a) and (7b), respectively, and the example shown in FIG. 4 is the case where one of them is omitted.

Open air type hesodophone (4a) (4b)
Examples of this are shown in FIGS. 5 to 7. (14) is the main body of the handphone. This is usually a well-known small earphone, that is, it is held in the ear by itself, and includes a case (15) containing an electro-acoustic converter and a cylindrical part (15) protruding from a part of the case (15).
6) (Ondo) and more. Usually, a relatively soft cylindrical body is further fitted onto the cylindrical portion (16), and this cylindrical body is fitted into the external auditory canal (19) shown in FIG. 5.

(20) is the auricle, and (21) is the so-called earlobe.

A trumpet body (17) is attached to the cylindrical portion (16) of the hesodophone body (14) described above, and the trumpet body (17) is inserted into the recess (22) formed on the lower side in the vicinity of the ear canal. Fit inside. In this case, the casing (15) of the headphone body (14) and the trumpet body (17) may be formed so as to sandwich the protrusion (23) on the upper part of the earlobe (21), or the trumpet body (17) may be does not necessarily have to be curved, and may be flat. In addition, there is an open air type handphone (4a) (
4b) is not limited to the above-mentioned example, and the same applies even if the speakers are placed near the left and right ears of the listener (6).

As the lure (1), one shown in FIG. 8 can be used. That is, in this example, a cassette-type tape recorder box is used as bait, and pseudo ears (24
a) and (24b), and attach the pseudo external auditory canal (24b) to this.
Microphones (2a) and (2b) are housed inside the microphones (2a) and (25b), and the signals collected by these microphones (2a) and (2b) are transferred to the tape (25b).
6). (7) is a speaker, (
27) is the legitimate child of Tuning, (28) is the dial, (
29) is the eldest child of the selector switch, and the headphone (
It is possible to switch between operating only the headphones (4a) and (4b), operating the headphones (4a) and (4b) and the speaker (7) at the same time, or operating only the speaker (7). (30) is the eldest child of the people adjustment, and allows the volume and sound quality of the hesodophone (4a) (4b) and speaker (7) to be adjusted separately. (3I) These are the jacks for the Hesodophone (4a) and (4b).

Effects of the Invention According to the present invention described above, the sound collected by the left and right microphones (2a) and (2b) attached to the pseudo H (11) is transmitted to the speaker (6) placed near the listener (6). In this example, the open air type Hesodopho 7 (4a)
and (4b),), so of course there is a stereo feeling, but since there is a speaker (7) in front of the listener (6), the listener also feels a front feeling as well as a stereo sound. It has the characteristics of being able to avoid the drawbacks of conventional closed-type hesodophones.

Further, according to the present invention, the delay circuits (34a) (34b) are inserted in the transmission system to the hesodophones (4a) (4b), respectively, so that the hesodophones (4a) (4b) are transmitted to the listener (6). ) and the front speaker (7)
(or (7a) (7b)) It has the characteristic of being able to match the arrival time with the sound from (7a) and (7b), thereby further eliminating unnaturalness.

Further, according to the present invention, since it is sufficient to transmit two-channel signals, the pseudo head side may be the same as a conventional pinaural stereo system, and only the listening side may be equipped with a speaker (7) in front of the listener. Since only a few steps are required, the overall device is hardly complicated and has the characteristics of being easy to handle.

[Brief Description of the Drawings] Figures 1 to 4 are connection diagrams showing respective embodiments of the device according to the present invention, and Figure 5 is a partially cross-sectional view showing the state of use of the device used in the present invention. 6 is a perspective view of the headphone body, FIG. 7 is a perspective view of the trumpet body,
FIG. 8 is a front view of an example of a pseudo head that can be used in the present invention. (1) is a pseudo head, (28) and (2b) are microphones on the left and right sides, (4a) and (4b) are a pair of left and right speakers such as hesodophones, and (7) is placed at a distance from the listener. This is a great speaker.

Claims (1)

[Claims] The signals obtained by the left and right microphones attached to the bait are independently supplied to a pair of left and right speakers, such as headphones, to be placed on both sides of the listener's ears via respective delay circuits. For speakers that should be placed in front of a pair of speakers, such as a pair of hesodophones, at least the microphones on the left and right sides of the lure should be placed at °C.
A stereo sound device configured to supply the obtained signals or a signal obtained by mixing them.