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Description or title of the invention
Signal correction device for head 7 on
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for
synthesizing a signal suitable for reproduction and listening on a headphone. More particularly,
the present invention can be applied to the electrical signal processing of a normal sound
reproduction signal, in particular for the localization of sound images, by providing a pinaural
signal that gives the same full sense of hearing as the dummy head microphone sound collection
signal. It is an attempt to provide a new device that can
Signal correction device for head 7 on
Hereinafter, the present invention will be described in detail based on the drawings. It is known
that when a normal speaker signal etc. is reproduced and listened directly with a headphone, the
sense of localization in the head of the sound image is generated, whereas if the sound pickup
signal by the dummy head microphone is reproduced and listened similarly It is generally known
that the sound image is localized outside the head. Because of this, the effect of localization
outside the head of sound tends to be thought of as an attribute in the dummy head microphone
sound pickup method, but in fact such an effect makes the dummy head microphone extremely
close to the sound source or anechoic. When the room sound is picked up, a sense of localization
in the head of the sound image is generated at the time of signal reproduction, while when the
user listens to a one-point microphone sound pickup signal or the like including a reflected
sound component sufficiently It can be said that it is more dependent on the reflection-.zeta.
Component in the signal reproduced by the headphone than the interposition of the dummy head
itself that the constant feeling can be obtained EndPage: 1. From the above, it is possible to
synthesize a pinaural signal giving a similar auditory sense effect (sense of localization outside
the head of a sound image) by including an appropriate reflected sound component in the signal
regardless of whether the sound is collected by the dummy head microphone However, the
simple addition of the thermal reflection sound component is incomplete and can not obtain a
sufficient out-of-head localization effect, and the characteristic of the pinaural polarization
including the reflection sound component is It is considered that sufficient out-of-head
localization effects occur in terms of sensitivity only when specific conditions are satisfied.
Therefore, in order to clarify the desired characteristic conditions and to determine the effective
signal processing system, the following sensory test was tried. Figure 1 (at ˜ jdl are the four types
of reverberation synthesis circuits used in this age, and the combination of attenuator 1 and
delay circuit 2 gives Figure 1 (alO features 1 and 1 are shown in Figure 2 1al; 3 Figure 1 fbl
characteristics are shown in Figure 2 (bl and Figure 1 (cl characteristics are 2 FIG. 1 al and FIG. 1
(characteristics of di are respectively shown in FIG. 2 al). Here, 3 is a caro calculator. FIG. 3
shows a sensory experiment apparatus, in which the signal from the signal source 4 is branched
into two lines and supplied to the two lines (A and B) of the reverberation synthesis circuit 5, and
the outputs thereof are headphones f3a, 6b. And the subject 7 listens. The circuits of al to fdl
shown in FIG. 1 are added to A and B of the reverberation synthesis circuit 5 of the sensory test
apparatus of FIG. 3 and the evaluation results of the window outside the head of the sound image
are shown for all combinations. In Figure 4 and Figure 5.
In this case, the reproduction level, the indirect sound energy and the reverberation time are
performed under the same conditions. In FIG. 5, the relationship between a and a% b, 5% C and
0% d and d is slightly different in time width Δ ° C. between pulses of impulse response. As
seen in FIGS. 4 and 6, the combination of the reverberation synthesis circuits changed the sense
of the head position of the sound image and was divided into three 4-patterns. In FIG. 4 and FIG.
5, the evaluation symbol ■ indicates in-head localization, S indicates out-of-head localization, and
0 indicates out-of-head localization. Considering the results of this sensory experiment, there is a
common point on the physical characteristics between the two systems of reverberation
synthesis circuits giving the same pattern of localization, and a certain correspondence between
the common characteristics and the localization pattern A relationship is found. That is, assuming
that all the transfer functions of each system of two systems of reverberation synthesis circuits
are each human (To month,> a in B) A′′rtI)) / B (; ttv) = 1, 1 (in-head localization) When try> /
H is yo> 1 to 1A, S (out-of-head near-field localization IA (, iu) /) J <; lu) I = xT: and τ τA (鉋
'control)'% = QO And @ O (outside of head positioning). From the above, when the reverberation
is applied for the purpose of the localization outside the head of the sound image, it is necessary
to make only the phase characteristics different as shown in FIG. 6 while keeping the amplitude
transfer characteristics the same between the two systems. It can be said. Here, FIG. 6 (at
indicates an amplitude transfer ratio characteristic between two systems, and a mountain
indicates a phase difference characteristic. In this case, the phase difference frequency
characteristic exhibits a pattern of cyclically advancing and retarding. In addition, when listening
to the sound in the sound field, the reverberation energy provided to the listener's binaural
position is closer to the binaural position compared to the spread of the normal sound field
space, and from all directions In order for the reflected sound to be incident on the head almost
equally, it is considered that the same amount of noise between the both ears and the
reverberation time (corresponding to the reverberation envelope) are also the same length.
Therefore, in the present invention, two systems of reverberation generation circuits shown in
FIG. 3 are formed, and all circuits as shown in FIG. The reverberation time (• reverberation
envelope) is equal between the two systems, the power ratio of the reverberation signal to the
direct sound signal is equal between the 02 systems, and the transmission amplitude frequency
characteristics are identical between the 02 systems EndPage: 2 A dummy head microphone
sound pickup signal can be added to the headphone by satisfying the respective conditions that
the advance / delay relationship between the two systems of phase or group delay time
periodically reverse gold repetition as frequency increases. It is possible to provide a pinaural
signal giving the same listening sensation.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a 1 to (d are reverberation synthesis circuits
having different reverberation characteristics) Fig. 2 fat-ldl show the twin pulse responses in Fig.
1 (al-(di respectively). FIG. 3 is a circuit diagram used in the sensory test of the present invention.
FIGS. 4 and 5 are tables showing the results of evaluation results j 倹 using the apparatus of FIG.
FIG. 6 is a inertia view showing the conditions of the present invention. 1 ... attenuator, 2 ... Direi
circuit, 3 ... Chikararo adder, 4 ... signal source, 5 ... two systems of reverberation synthesis circuit
6a, 6b ... headphone, 7 .. -Listener Lffff Application Applicant Trio Ltd. 7-EndPage: 3Z 4 EndPage: