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Description 1, title of the invention
Stereo system
3. Detailed Description of the Invention The present invention relates to the improvement of a
stereo system having a reverberation device. In conventional stereo reproduction, it is necessary
to reduce the company's reverberation in order to improve the localization of the sound source,
and to increase the reverberation in order to increase the sense of the sound / field expansion. It
was difficult for the spread to satisfy both sides of the sense. Therefore, the present invention is
intended to provide a stereo system in which a delay device is used in combination and
reverberant sound is uncorrelated so that the spreading which has been in a contradictory
relationship until now is reconciled with a sense of excitement and localization of a sound source.
It is. One embodiment will be described with reference to the following drawings. FIG. 1 shows an
embodiment in a two-channel stereo reproduction system, and it is essential to place an audio
signal input for L and R channels between each speaker 1.2. The main signal amplifier 3.4 is
connected, and a part of the signal from each audio signal input end is mixed in the mixer 5 to
put the signal from the mixer 5 through the delay unit 6 and remaining EndPage [7] The
reverberation signal and main signal are mixed in the amplifiers 3 and 4 by adding each output
from the reverberation adding device γ to the amplifier 3.4. On the other hand, FIG. 2 shows a
slight modification of FIG. 1. The reverberation sound from the reverberation adding device 1 is
reproduced by the speaker 0.11 through all the amplifiers 8, 9 and a total of 4 speakers, 2.10.11
To create a sound field. In the above, the reverberation adding device 7 includes two
reverberation generating devices & 7. , 72. And reverberation generator γ7 with The circuit
shown in FIG. 3 is separately used for T2. In FIG. 3, it is desirable that 12 is a reverse phase
amplifier of a gay yg (g <1), 13.14 is an adder, and 15 is a gain in the range of 1−g2) ゝ 3QmS. ,
A positive phase amplifier of gain g, and a delay circuit 11 of time τ. The impulse response
characteristic of this reverberation generator has the characteristic shown in FIG. 3 and the
frequency characteristic is flat. In the case where one shown in FIG. 3 is used separately, the
delay time τ and the key gt are made different, and the correlation coefficient between the
outputs of the reverberation generating devices 71 and 72 is set to zero. From the above,
according to the circuit shown in FIG. 1 or FIG. 2, by the delay device 6, the influence of time
delay appears on the reverberation sound with respect to the main signal, and therefore the
sound field is changed by changing this delay time. You can control the arrival time of the
reverberation sound that corresponds to the primary reflection of the room that has a large
influence on the sense of spread.
This delay time is a few ms to a sound field that makes the spreading feeling of the buzzing
sound compatible in the best state. Also, since the reverberation sound is uncorrelated between
both channels, the localization of the sound image formed by the original sound by the main
signal There is little to be affected, so it is possible to satisfy both the sound image localization
and the sound image localization in the best condition. On the other hand, FIG. 4 is a block
diagram for adding a residual signal metal to create a signal (source) to be reproduced, in which
the signals from a plurality of microphones 18 are mixed by the mixer 19 with amplified ones, It
is divided into two channels and then configured as in the case of 1-IK'1. 20 and 21 ° are
amplifiers. In this case, localization of the sound source can be formed by reproducing the output
signals from both channels entirely in the stereo system without the usual reverberation adding
device. Although the above embodiments have been described for the case of two channels, the
same can be realized for more than two channels, and the effect can be achieved by increasing
uncorrelated reverberation signals regardless of the number of channels. growing. Also, the
reverberation generator 71 * T * may be a mechanical reverberation generator, a reverberation
room and a microphone. From the above, when playing back in a dead room with a short
reverberation time, a great effect will be exhibited.
4. Brief description of the drawings. FIG. 1 is a block diagram of a stereo system on the
reproduction side, FIG. 2 is a block diagram of another embodiment of the stereo system
EndPage: 2 on the reproduction side, and FIG. FIG. 4 is a block diagram of the stereo system on
the source creation side. 5 ······ Mixer 6 ········ Delay device 7 ··········· Reverberation device '-v- Ichino
EndPage: 3