JPS5944199A - Headphone device - Google Patents

Abstract

PURPOSE:To locate a sound source to a position at the outside of a head, by providing an electric control system giving a head transfer function at the reproduction of a stereo speaker in a stereo signal transmission system to a headphone main body so as to detect and control the turning of the head and forward and backward movement. CONSTITUTION:An acoustic signal from a signal source is inputted from a terminal 11, a part is given to a controller 12 as it is, and the other is given to the controller 12 via a time delay line 13 giving a transfer function as an indirect sound and a crosstalk adding system 14. The output of the controller 12 passes through a head parallel progressing control section 16 detecting the parallel progress of the head in a backward and a forward direction and controlling the change in the intensity via a head turning control section 15 detecting the turning of the head and giving a time difference to left and right ears, and drives a headphone main body 17. Thus, the position of the sound source is located at the outside of the head same as the reproduction from a speaker.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a headphone device capable of localizing the reproduced sound image outside the head while listening head-to-head.

Conventional configurations and their problems In general, headphone devices have a reproduced sound image localized in the user's head, which often gives the user a feeling of fatigue. and,
Attempts have been made to localize the reproduced sound image outside the head by adding indirect sound even when listening through headphones. FIG. 1 shows a conventional headphone device. In Fig. 1, the input signal from a signal source such as a tape recorder or record player applied to the input terminal 1 not only enters the controller 2 as a direct sound system, but also is provided to realize an indirect transfer function. The signal is applied to the controller 2 via the time delay line and frequency characteristic weighting system 3, and further through the crosstalk addition system 4, and is supplied to the head body 6 from the output terminal 5. However, in this method, unlike actual stereo speaker listening, the transfer functions of the simulated direct and indirect sound paths do not change due to human movement.

For this reason, it is fundamentally different from speaker listening in terms of sound image localization, and has the disadvantage that the sound image of front hemostasis becomes ambiguous.

OBJECTS OF THE INVENTION An object of the present invention is to provide a headphone device that allows a listener to hear a reproduced sound image that corresponds to the movement of the listener when listening to reproduction through a speaker.

Structure of the Invention The hesodophone device of the present invention detects the movement of the head of a headphone listener, and changes the transfer function of an electrical control system provided in the transmission system of the main body of the headphone device based on the detection result. It is composed of According to such a configuration,
Since head-related transfer functions during stereophonic power reproduction can be given to the electrical control system according to head movements of the headphone listener, the reproduced sound image can be perceived to be almost the same as when listening to stereophonic reproduction even when listening to headphones. It has the advantage of being able to

DESCRIPTION OF THE EMBODIMENTS FIG. 2 shows an embodiment of the present invention, in which 11 is an input terminal to which an input signal from a tape recorder, record player, etc. as a signal source is applied, and 12 is an input terminal. A controller which applies the input signal applied to the terminal 11 as a direct sound, 13 a time delay line and frequency characteristic weighting system which gives the input signal a transfer function as an indirect sound, and 14 a controller which similarly gives a transfer function as an indirect sound to the input signal. The indirect sound signals processed by these circuits are added to the two direct sounds in the controller 12. The output from the controller 12 is supplied to the headphone body 17 via the head rotation control section 16 and the head rotation control section 16.

Here, as shown in FIG. 3, the head rotation control section 16 is controlled by a control signal obtained by adding a head rotation detection signal from a rotation sensor 18 to a control section 19 and converting it into an appropriate DC voltage. The time differences Δt (θ-30°) and Δt(θ-(-30
0)) and absolute value difference circuits 22 and 23 that provide the absolute value differences IHθ/H3゜l and IHθ/H-3ol of the transfer functions are provided for each channel signal transmission system of the two-channel stereo. ing. These time difference circuits 20. The absolute value difference circuits 22 and 23 are controlled by voltage controlled oscillators 24 and 26 and voltage controlled amplifiers 26 and 27 to which the L current voltage as the second control signal is applied.

On the other hand, the head translation control section 16 sends the distance difference detection signal from the displacement sensor 28 to the control section 29 as shown in FIG.
In addition, the circuit is configured to be controlled by a control signal converted into an appropriate DC voltage, and time difference circuits 30 and 31 giving a time difference T (Δd) and an absolute value difference IHθ'/H3
Absolute value difference circuits 32 and 33 for providing o1 are provided for each channel signal transmission system of channel stereo. These time difference circuits 30 and 31 and absolute value difference circuit 32
．． 33 is a voltage controlled oscillator 34.35 and a voltage controlled amplifier 36.3 to which the i current voltage as the control signal is applied.
It is controlled by 7. Specifically, when the head translates back and forth as shown in FIG. 5, if the head moves to the reference angle 300 or θ', the time difference is T(Δd)'; Δd e cos 30°/C. −Δ
The absolute value difference IHθ'/H1 can be simulated by controlling the change in intensity due to the distance difference Δa-('i/2) to the sound source.

In this way, according to this embodiment, the indirect sound delay line 13
Since headphone playback is performed via the losstalk generation system 14, direct sound/indirect sound control unit 12, forward rotation control unit 16, and head translation control unit 16 to the listening headphone body 17, subtle movements of the head are reflected in the sound image of the listening sound. This has the advantage of bringing about changes similar to those when listening to an actual speaker, and providing a hearing sensation as if one were listening to a speaker. In particular, it has the advantage that the rise in the sound image in the median plane is clearly suppressed.

Effects of the Invention As detailed above, according to the present invention, the transfer function of the electrical control system provided in the transmission system to the head device main body is configured to change in accordance with head movements of the headphone listener. Therefore, there is an advantage that substantially the same reproduced sound image can be perceived when the sound is reproduced inside the speaker.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional hesodophone device, and FIG. 2 is a block diagram showing an embodiment of the headphone device of the present invention.
Figures 3 and 4 are specific circuit configuration diagrams of the main parts of the device, and Figure 5
The figure is an explanatory diagram of the operation of the device. 12-...-One Sac Controller, 13 Life Fist...Time Delay IA Line, 14##1III611 Crostorf System, 1
5.φ...Fist rotation control unit, 16...Head translation control unit, 17...Headphone body. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure=555- 4th rI! J Figure 5

Claims (1)

[Claims] An electrical control system that can provide a head-related transfer function during stereo speaker playback is installed in the stereo signal transmission system to the headphone body, and the head-related transfer function of this electrical control system is applied to the vertical axis of the listener's head movement. A headphone device configured to change according to circumferential rotation and longitudinal translation.