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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a sound transmission path
from a speaker to a listener, and FIG. 2 is a block diagram showing a configuration of an
embodiment of the present invention. 11a, 11b... Equalizer having transfer function HA / HE,
12a, 12b. 13b ииииии T2 delay circuit, 14a, 14b ииииииии Equalizer with transfer function HD / HE, 15a,
'15b ииииии Delay characteristic T3, transfer function HC / HD Reverberation circuit having, 16a,
16b иииииииииииииииииииииииииииииии Listener, 4a, 4b иииииииииии Vibration unit with transfer function HE.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bone conduction
receiver adapted to provide a listener with a natural sound image localization that listens to a
normal speaker reproduction sound. Generally, when listening to the sound emitted from the
speaker, the sound reaches the ears through various transmission paths as shown in FIG. That is,
the sound emitted from the speaker l travels through the space directly as A, B and reaches both
ears of the listener 2, and as C, D, the surrounding wall 1- / AJ? ??????????????
??? ????????? '3' or the ceiling, etc. to reach both ears. However, for example, when
listening to the sound with headphones, it is different from the case of the speaker sound, and
there is no crosstalk or reflection sound existing in the speaker sound, so the localization of the
sound image is only in the head and the width is also right and left. Only on the line segment of
That is, the headphone device does not include the transfer characteristics corresponding to the
paths of C, D, etc. in FIG. By the way, the ear perceives 19 sounds in the vibration of the tympanic
membrane and also senses the cartilage around the outer ear, but even in a bone conduction
receiver in which this cartilage is vibrated according to the sound, localization of the sound
image is similar to the headphones Only in the head, natural sound image localization could not
be obtained as the speaker sound was heard with both ears. In order to solve the abovementioned drawbacks of the prior art, the present invention adds a pseudo circuit that simulates
the transfer characteristic of the propagation path which the speaker sound normally passes to
reach the ear, and gives a natural sound image localization to the listener. Providing a bone
conduction handset. Hereinafter, the embodiment will be described in detail with reference to the
drawings. 2-pal? ? 4. j, 71 и Fig. 2 shows an embodiment of the present invention and is an
example of a stereo channel. Now, the transfer characteristic of the sound of the path A in FIG. 1
is temporarily represented by the transfer function HA-, and similarly, those of the paths B, C and
D are respectively represented by '-fLHBIHOIHD. In addition, since the vibration units 4a and 4b
that vibrate the cartilage have various characteristics, their transfer function is represented by
H1. Further, it is assumed that the sound source (corresponding to the speaker in FIG. 1) is
located in front of the listener and in a symmetrical position. In FIG. 2, 11. Is an equalizer having
a transfer function HA / H, and 16a is an adder. Then, since the vibration unit 4a has the transfer
function H1, this equalizer 11. A transfer function H-M can be realized by the line of the adder
16a-vibration Unino 4a. Next, 12m is a reverberation addition circuit having a delay element
having a delay characteristic of the propagation time difference ?1 of the sound in path A and
path B in FIG. 1 and a transfer function HB /) IM, so that equalizer 1+, The transfer function 1B is
realized by the line of the reverberation addition circuit 12a the adder 16b and the oscillation
Unino 4b.
Further, 13a is a delay port 3-075't 'having a delay characteristic of ?2,', ',' r и, # 1 ? ? '-') path,
14m is an equalizer with a transfer function HD / H, +, 15m is The transfer characteristics of the
reflection paths C and D such as the wall in FIG. 1 can be realized with a reverberation addition
circuit having a delay element of ? 3 and the transfer characteristic He / HD. Although the R line
has been described above, the transfer characteristic of each path in the stereo channel can be
realized by giving the same characteristic to the circuit corresponding to each circuit of the R
line. In this embodiment configured as described above, each signal of the stereo channel passes
through an equalizer or reverberation circuit having various transfer functions, and is added to
the adder 16a. As they are synthesized at 16b and applied to the vibration units 4a and 4b,
natural sound localization can be given to the listener as if listening to the speaker sound, and
the sense of reality can be increased. ?
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