JPS60204200A - Headphone device - Google Patents

Abstract

PURPOSE:To make a sound source position toward the head constant by applying sound volume control to an output of two sounding bodies to that the output is larger at a side closer to the reference sound source and smaller at a side remote from the reference sound source through the use of an output of a gyro compass. CONSTITUTION:The two sounding bodies 12, 13 are fitted to a support 11 and the gyro compass 14 is titted to the center of the support 11. Then amplifiers 15, 16 ampliifying power for headphone drive to right/left audio signals SM generated from the soind source 17 such as a record player are connected to the sounding bodies 12, 13. Moreover, a bus 18 transmitting a directional signal SD outputted from the gyro compass 14 is connected to the amplifies 15, 16. Since the signal SD in response to a shifted amount when the head is shifted from a prescribed direction is outputted by setting the compass 14 in the prescribed direction at the start of listening, the amplifiers 15, 16 are controlled so that the sound volume of the approaching side is larger and the sound volume of parting side is smaller thereby localizing the sound source position even if the head direction is changed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a hellaphone device, which is used for listening to music and other purposes.

[Technical background of the invention]

The headphone device is used to listen to various sounds such as listening to music such as a portable stereo cassette player, listening to translations at the Ori International Conference, etc. by wearing a sounding device near the ear or inserting it into the ear. It is widely used for

Most of these headphone devices are of a binaural type in order to provide a stereophonic effect and to reduce the mixing of external sounds.

In such a binaural hellophone device, the sound image is always localized at a position midway between both ears. In other words, Figure 1 (
If the volume entering from both ears / and d are equal as shown in a), the sound source appears to be in the front direction as shown by arrow 3, but if you turn your head as shown in Figure 1(b), Even if the sound is changed, the sound t1 that enters both ears does not change, so the sound source is felt to be in the front direction of the head regardless of the actual sound source position, and relative localization with respect to the human being can be obtained.

[Problems with back υ technology]

However, with conventional headphone devices that produce a certain localization relative to the head, there is no particular problem when the eyes are closed, but when the sound source can be identified and visual acuity or sense of balance is used together, Something unnatural happens. In other words, if the natural sound source is the moon and 1311<1, the front station entering from both ears is equal when facing the front, as shown in Figure 2 (a), and when the direction of the head is changed, it is as shown in Figure 2 (b). As shown, the volume l' that enters the left ear near the sound source is larger than the volume λ' that enters the right ear, and the sound source direction 3 with respect to the whole body does not change, and absolute localization can be obtained. Radphone devices cannot achieve such localization, and there is a problem in that an unnatural phenomenon occurs in which sounds are heard from a position different from the visually recognized sound source position.

[゛Object of the invention]

The present invention has been made in an attempt to solve the above-mentioned problems, and it is an object of the present invention to provide a headphone device in which the absolute sound source position can be heard at a constant level even if the direction of the head is changed while the headphone device is being worn.

[Summary of the invention]

In order to achieve the above object, the present invention provides a headphone device having two sounding bodies worn on each ear, in which a sound source detects the relative direction of a reference sound source viewed from the center between the one sounding body. By the direction detector and the output of this sound source direction detector! A feature of this feature is that it is equipped with a volume control device that increases the output of the two sounding bodies on the side closer to the sound source and decreases the output on the side farther from the sound source.The sound source position remains absolutely constant even when the direction of the head is turned. It is possible to obtain a natural localization that allows you to hear the sound according to your position and feel the natural sound volume with your ears.

[Embodiments of the Invention] Some embodiments of the invention will now be described in full detail with reference to the drawings.

FIG. 3 is a block diagram showing the configuration of an embodiment of the headphone device according to the present invention, in which two sounding bodies /, 2 and 13 are attached to the support body //, and a gyro compass /4' is shown. It is attached to the center of the support //. Furthermore, amplifiers /S and /A are connected to the sounding bodies 12 and /3 to amplify the power for driving the headphones for the left and right sound signals SM generated from the sound source 17 such as a record grayer. Amplifier /S and /
A path /8 for transmitting the direction signal Sok output from the gyro compass /lI is connected to 6.

By setting this gyro compass in a certain direction at the beginning of listening, when the head deviates from this direction, it outputs a direction signal SD corresponding to the amount of deviation, so the volume is louder on the closer side and louder on the far side. The amplifier /, t, /A can be controlled to reduce the sound on the side where the head is facing, and it is possible to obtain a very natural localization in which the sound is heard from a fixed position no matter which direction the head is turned. can.

Fig. ψ is a block diagram showing another embodiment, in which the support 2/ has λ sounding elements 28. - and 23, reference signal receivers J and M are attached which receive all three ultrasonic reference signals St3 transmitted from four reference signal transmitters placed at reference points serving as virtual sound source positions. The reference signals received by the reference signal receivers YuS and Yu6 are transmitted to the regulators 2? ``f1'' quantity ratio signal Sv is outputted by
An acoustic signal S generated by the sound source 30.

Amplifiers that amplify power require a lot of human power.

The basic structure of such a headphone device is shown in FIG.

According to this, the reference signal date s issued from the four reference signal transmitters is received by the reference signal receivers 2.8' and 2.8', and is sent to the distance and angle detection section 27a, and is sent to the receiver 25.8'.・
;The angle of the transmitter 21 with respect to the net connecting 16f is detected,
Further, the left and right volume ratios are calculated by the on-dispersion ratio calculating section 27b.

The subtraction of this distance h(, angle, and volume ratio) will be explained in detail with reference to FIG.

Now, when the front of the head is facing the reference signal transmitter 2μ located at the reference point, the distance between the reference signal transmitter and the center point O of the reference signal transmitter 2μ and the reference signal transmitter 2'l is 1. year,
Left sacral receiver 25 when the head orientation is compared by θ
Let the distance between J and the transmitter be IL, and the distance between the receiver J on the right side and the transmitter be IB, and the pulse-modulated ultrasonic waves emitted from the transmitter Koda reach both receivers, 2, and M. Let TL and TF+ be the time taken to reach the point, respectively, then the speed of sound can be expressed as m and [2. Therefore, the left and right distance ratio is LL/
, = T L7TR The volume can be adjusted using . However, if LL and IB are sufficiently large for the distance d between the receiver and 26, the volume ratio is TL/TR, so the volume ratio can be corrected using an appropriate constant α. In that case, the volume ratio can also be calculated using the known attenuation rate U(1) of the sound in the air and the attenuation rate V(
You can use this to write the following.

Here, θL and θR can be determined from TL -'rR1'' using the triangular space &, especially when receivers 25 and 2 are facing opposite directions on the same straight line as shown in Figure 6. In this case, θL=θR. The left and right sound electric ratio signals IEV thus determined are input to the amplifiers 2g, 2q, and the amplifiers 2g, 2? convert the acoustic signal SM from the sound source 30 into a reference sound source. Since the side closer to the reference sound source is adjusted to be larger and the side farther from the reference sound source is adjusted to be smaller, even if the direction of the arm is changed,
The sound should always come from the reference sound source position,
You can obtain absolute localization similar to that of natural sounds.

In the embodiments described above, left and right volume adjustment is performed by the amplifier, but this amplifier is used by the other receivers 2. S', 2
It may be an amplifier separate from the sound source device provided on the support body 2/other together with t, or an amplifier forming part of the sound source device.

Although the position of the reference sound source is fixed in the embodiments shown in Figures 1 through 6, it can also be moved. For example, as shown in FIG. 7, when listening to simultaneous interpretation at an international conference or the like through a headphone device ν, a reference syllable transmitter ψ/a-J! is placed in front of each speaker. /b1, and if it is switched in accordance with the detection, the interpreter's voice can be heard from the speaker's position. In Figure 7, although Interpreter J is in a different position from the actual speaker A, by selecting the reference sound source transmitter F/a'iz, the interpreter It is easy to identify the speaker by receiving the immediate impression that A is speaking in the translated language.

The embodiment shown in Fig. g is applied to a flight simulator for airplane pilot training, and is used for collision accident avoidance training. According to this, the reference sound source oscillator 5
This is done by receiving a reference signal from a model of an airplane equipped with an aircraft, so the way the sound is heard matches the sense of sight and balance.

In the above embodiments, a pulse-modulated ultrasonic wave is used as the reference signal, but if it is possible to easily measure distance and position, a radio wave generator or receiver suitable for these characteristics may be used. Also, in the examples, there is no mention of the directivity of the receiver, and any directivity such as omnidirectional or unidirectional can be used. When a loud volume is generated, it is possible to change the direction of the head by 1 rcr so that the volume is heard as a low volume @ [Effects of the Invention] As described above, the present invention According to the method, the output of the sounding body is determined by the output of a sound monument direction detector that detects the relative direction of the reference sound source with respect to the sounding body worn in both ears. Since the volume is controlled to reduce the 'llj', it is possible to achieve natural localization, as if listening to natural sounds with the ears, regardless of the orientation of the head.In particular, this naturalness is important for visual perception and balance. It is thicker when all the senses are used together, for example when music is played all the time while dancing.

[Brief explanation of drawings]

FIG. 7 is a diagram showing sound localization in a conventional hellaphone device, FIG. 41 is a diagram showing sound localization in natural sounds, and FIG. 3 is a block diagram showing an embodiment of the present invention using a gyro compass. FIG. V is a block diagram showing another embodiment of the present invention using ultrasonic waves, FIG. 5 is a block diagram explaining the embodiment shown in FIG. A diagram showing the principle of detecting the distance jiiIt direction between the transmitter and the reference signal receiver, and FIG. 7 and FIG. r are diagrams showing other embodiments to which the present invention is applied. /,,2.7',,2'... front sound, 3. sound source direction, //
, 2/... support, /, 2, /3, . 2.
2, 23... sounding body, 15. /Otsu, +2g. λ9...Amplifier, 6. /7. ．． 30... sound source, /ll.
Gyro compass, evaluation... reference signal transmitter, 3. Yuotsu...Reference signal receiver, 27...Adjuster 1.27a
. . . distance angle detection unit, 27b . . . tone group ratio calculation unit. One agent for fishing Kiyoshi Inomata First cause Figure 2 [ Figure 5 Figure 3 7 Figure 6

Claims (1)

[Scope of Claims] /0 A headphone device having one sounding body worn on each ear, comprising a sound source direction detector for detecting the relative direction of a reference sound source with respect to the λ sounding bodies, The hellophone device is configured to control the volume of the outputs of the λ sounding bodies so as to increase the outputs on the side closer to the reference sound source and decrease the outputs on the side farther from the reference sound source according to the output of the detector. 2. The hellophone device according to claim 1, wherein the sound source direction detector is a gyroscope. 3. The hellophone device according to claim 1, wherein the sound source direction detector receives an ultrasonic signal emitted from a reference sound source position and determines the sound source direction by calculating the position with respect to the reference sound source. 4. The headphone device according to claim 1, wherein the reference sound source position is a fixed point. j. The hellophone device according to any one of claims t% to 3, wherein the reference sound source position moves. 6. The Hellaphone device according to claim 5, wherein the reference sound source position is moved by switching between a plurality of reference sound source positions using a switch.