JPH05183998A - Headphone - Google Patents

Abstract

PURPOSE:To easily simulate the realistic sound of presence obtained by speakers with the use of the headphone by turning the head. CONSTITUTION:The headphone is provided with a sensor detecting the head turn angle and a modulator changing sound signals inside the headphone. As shown in the illustration 1, the sensor and modulator sets the location of a sound source 1 in advance. The sensor detects the turn angle theta between the set position and the present location of the head 2, and the modulator changes signals according to the delay and sound pressure of the sound obtained by the angle theta.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to headphones used for listening to sounds such as headphone stereo.

[0002]

2. Description of the Related Art In a conventional headphone, as shown in the configuration diagram of FIG. 5, L and R sound signals generated in an audio device are reproduced as they are in S _L and S _R of the headphone and can be heard. There is.

[0003]

However, in the above-mentioned prior art, it is possible to hear an unnatural and realistic sound when the head is rotated, contrary to the localization ability of the stereo speaker, only by hearing the sound with the headphones. could not.

It is an object of the present invention to provide a headphone which allows the user to easily hear a realistic sound even with headphones.

[0005]

A headphone of the present invention is characterized by having a headphone, a modulator for changing a sound signal, and a sensor for detecting a rotation angle inside the headphone.

[0006]

Example 1 A headphone has a sensor for detecting a head rotation angle and a modulator for changing a sound signal inside.

As shown in FIG. 1, a sensor detects a rotation angle θ between the sound from the sound source 1 and the current direction of the head 2. Therefore, the shift amount Δh between the left and right headphone positions is obtained from the rotation angle θ detected as shown in the configuration diagram of FIG. The amount of deviation Δh at this time is

[0008]

## EQU1 ## Δh = d × sin θ. Next, the sound delay Δt due to the deviation amount Δh is obtained.
At this time, Δt is

[0009]

## EQU2 ## Δt = Δh ÷ C However, C = 340 [m / sec] (sound velocity). The left and right sound pressures P due to the deviation amount Δh are also obtained.
At this time, if the sound pressure P is a sound from one point in the setting direction, and the sound field intensity is I ₀ ,

[0010]

[Equation 3]

If r >> Δh ÷ 2, then P _L is

[0012]

[Equation 4]

Further, the numerator and denominator are (1 + Δh ÷
r),

[0014]

[Equation 5]

[0015] Similarly, if P _R is also performed,

[0016]

[Equation 6]

[0017] Next, considering the case of stereo etc., since there are sound sources at two places on the left and right as shown in FIG. 2, it is necessary to input both the R and L sounds to the headphones S _L and S _R , respectively. For the sake of simplicity, for example, in the case of symmetrical positions, first focusing only on the right speaker, the distance r ′ to the sound source is

[0018]

Equation 7] ^{r '= √ (r 2 +} B 2/4) , and the angle of incidence α of the sound,

[0019]

## EQU8 ## α = Tan ⁻¹ (B / 2 / r). As a result, the deviation amount Δh is

[0020]

## EQU9 ## Δh _R = d × sin (α). Therefore, the sound delay Δt due to the deviation amount Δh is

[0021]

## EQU10 ## Δt _R = Δh _R ÷ C. As a result, the sound pressure P generated by the sound source R3
Is

[0022]

[Equation 11]

Similarly, for the sound source L4,

[0024]

[Equation 12]

[0025] Next, considering the head rotation angle θ, the deviation amount Δh is

[0026]

[Formula 13] Δh _R = d × sin (θ−α)

[0027]

## EQU14 ## Δh _L = d × sin (θ + α), which can be obtained by substituting the sound delay Δt described above and the sound pressure P into the equation.

Accordingly, the sound delay Δt generated by the sound source R3 and the sound source L4 described above and the sound pressure P are generated in the respective signals of the headphones S _L and S _R.

That is, the signals L and R input to the headphones are modulated into signals corresponding to the sound delay and sound pressure, and the sounds are reproduced from the headphones S _L and S _R.

(Second Embodiment) Headphones, a sensor for detecting a head rotation angle inside the headphones, an acoustic device, and a modulator for changing a sound signal inside the acoustic device.

As in FIG. 1, the direction of the sound source 1 is stored in the sensor, and the sensor detects the rotation angle θ depending on the set direction and the current direction of the head 2. Therefore, the rotation angle θ detected as shown in the configuration diagram of FIG. 4 is transmitted to the audio device, and the amount of deviation Δh and the sound delay Δt due to the amount of deviation Δh are transmitted in the audio device as in the first embodiment. The left and right sound pressures P due to the deviation amount Δh are obtained.

Therefore, the sound device modulates the output sound signal into a signal corresponding to the sound delay and sound pressure, and sends the signal to the headphone, and the headphone outputs the modulated sound from the headphones S _L and S _R. To reproduce.

(Embodiment 3) In the sound delay Δt and the sound pressure P obtained in the first and second embodiments, the sound is further delayed so as to emphasize the sound delay Δt, and the sound pressure P The sound pressure can be further weakened to emphasize the dynamics.

[0034]

As described above, by rotating the head, it is possible to easily experience a realistic sound obtained from a speaker or the like with headphones.

[Brief description of drawings]

FIG. 1 is a first headphone according to a first embodiment of the present invention.
FIG.

FIG. 2 is a second headphone according to the first embodiment of the present invention.
FIG.

FIG. 3 is a configuration diagram of headphones according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram of headphones according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a headphone according to a conventional technique.

[Explanation of symbols]

 1 sound source 2 head 3 sound source R 4 sound source L

Claims (2)

[Claims] 1. Headphones comprising a headphone, a modulator for changing a sound signal, and a sensor for detecting a rotation angle inside the headphone. 2. Headphones comprising a headphone, a sensor for detecting a rotation angle inside the headphone, an acoustic device such as a headphone stereo, and a modulator for changing a sound signal inside the acoustic device.