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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a conventional
reverberation adding apparatus, FIG. 3 is a block diagram of a reverberation adding apparatus
according to an embodiment of the present invention, and FIG. FIG. 5 is a diagram showing the
phase shift amount versus frequency characteristic of the phase shifter and the frequency
characteristic of the output signal of the adder, and FIG. 5 is a block diagram of another
embodiment of the present invention. 1.2 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
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DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reverberation
adding apparatus for adding reverberation to a stereo second channel signal, and when applied
to a stereo source, such as a source where a singer is localized at the center of a speaker 272'y2,
especially a speaker, a central stereotactic singer When applied to a source that is localized, it is
difficult for reverberation to be added to the singing voice of the central localization singer, so
that changes in echo feeling and sound image localization can be reduced and natural
reproduction can be performed as usual, and so-called surroundings other than central
localization It is an object of the present invention to add a desired reverberation to a localization
signal to realize a sense of breadth in a stereo reproduction sound field. FIG. 1 and FIG. 2
respectively show the conventional reverberation adding apparatus. In FIG. 1, 1 and 2 are stereo
signal input terminals, and 3 is an adder. The adder 3 is a circuit that adds stereo signals in phase
and level at the same phase to create a signal sum. This sum signal is input to a reverberation
generating circuit 4.1 using a spring, or a signal delay element such as a BBD (analog signal delay
1 element) or the like. The sum signal at this time contains the central localization signal and the
ambient localization signal at the same level. (In the general case, the central localization signal
level is distributed to each of the two channels at a level 13 dB lower than the level of the three
surrounding localization signals so that the reproduction level becomes the same at stereo
standard listening. 2.) Centrally Localized Signal 1 Ambient localized signals are converted to
reverberant signals at equivalent levels. The reverberation signal is positive-phase added to one
of the stereo signals by the adder 5, and the other is also positive-phase added by the adder 6,
and the direct signal and the reverberation signal are mixed and output to the respective signal
output terminals 7, 8 Ru. In the conventional apparatus shown in FIG. 1, a reverberation signal is
added to ?1 for both the ambient sound and the central localization sound, and a considerable
amount of reverberation is added to the singing voice (central localization vocal). This will cause
a large tonal change in the reproduced sound of the signal, which plays a central role in stereo
north. In order to eliminate the disadvantages of the prior art, the apparatus shown in FIG. 2 and
FIG. This second prior art example is the one in which the adder 3 total subtracter 9 of the circuit
shown in FIG. 1 is substituted, and the stereo signal is the signal sum in FIG. In the example, the
signal difference is taken by the subtracter e. In this No. 4 difference configuration, the same
four-level signal between the stereo second channels, that is, the central localization component
(vocal) is not completely canceled by the subtracter 9 and is not input to the reverberation
generation circuit, It is an excellent device in that reverberation is added only to the ambient
localization signal without adding reverberation to the central localization signal, but it is also a
configuration to emphasize the signal difference component between the two channels.
Therefore, due to the recorded contents of the stereo source, for example, on microphone
recording with less difference signal components and off microphone recording with many
difference signal components, a large fluctuation occurs in the output signal level of the
subtractor 9, and the sound field width feeling is added by the reverberation addition effect. In
the setting of, there is a drawback that the stereo source dependency becomes large. The present
invention provides a reverberation adding apparatus capable of eliminating the drawbacks of the
conventional example shown in FIG. 1 and the second cause, and an embodiment of the present
invention will be described below with reference to FIG. . In FIG. 3, 1 and 2 are stereo signal
input terminals, and one input signal is directly input to the positive phase input terminal of the
adder 3, and the other input signal is positive through the phase shifter 10. Input to the phase
input terminal. The phase shift amount of this phase shifter 10 is small in the low frequency
region of the input signal and becomes large as it shifts to the high frequency region, and takes
the limit flik of the desired set value -? degree in the sufficiently high frequency region. In this
embodiment, the phase shift amount limit value ?? is set to ?? = ??. The stereo input signal
characteristic in this case will be described. When the signal is inputted only to the input
terminal 2, the output signal of the adder 3 is obtained as an output signal which is compared
with the human power signal, and is inputted to the other input terminal 1. The signal is phaseshifted to the input terminal signal phase VC by the phase shifter 10, and is phase-shifted by the
phase-shifter setting phase shift characteristic. However, the frequency # 4 does not change and
is output from the adder 3. That is, the signal independent of each input signal terminal becomes
the output signal of the adder 20 as it is and becomes the input signal of the reverberation
generator 4 through the bypass filter 11. Next, the output signal characteristic of the adder 3 in
the case of a signal such as the same homology level signal of the second stereo signal, that is,
the voice of the singer becomes the characteristic shown in FIG. 9 Assuming that the effective
value QB of the input signal level of the input terminal 1 and the effective value of the input
signal level of the input terminal 2 are C, the output No. 18 level A of the adder 3 is the phase
shift amount or ?-9 It becomes. In the case of a singer or the like homologous level signal, since
it is B-C, when the extreme value of the phase shift amount is set to -? as shown in FIG. 4, A = o,
and output to the adder 3 Does not occur. As described above, by interposing the phase shifter
10i to one of the adders 3 for adding stereo signals in this manner, it becomes possible to give a
frequency characteristic only to a central localization signal of a singer or the like. The frequency
characteristic of the embodiment shown in FIG. 3U has a low pass characteristic as shown in FIG.
In this case, the output level of the middle low band signal becomes relatively high, and only the
middle low band signal of the central localization signal is output.
For this reason, in the present invention, the bypass filter 11 is inserted in the subsequent stage
of the adder 3 to cut the low band so that the band pass filter characteristic 7 is formed by Yori
Total. By setting the phase shift characteristics of the phase shifter 10 and the cutoff frequency
of the bypass filter to appropriate values as described above, the input signal frequency
characteristics to the reverberation generation circuit by the central localization signal and the
signal level are localized. With respect to a signal (signal of only one channel), it is possible to set
narrow band and low level with freedom. The output .degree. Signal of the reverberation
generator 4 is added to the original input signal by the adders 5 and 6 and is output to the
output terminals 7 and 8 as a reverberation added signal. FIG. 5 shows another embodiment of
the present invention. In this embodiment, the output of the phase shifter 1o is input to the
phase inverting terminal of the subtractor 9, and the frequency characteristic with respect to the
stereo homological level is such that a local minimum is obtained at low frequency and a local
maximum is obtained at high frequency. In the embodiment shown in FIG. 3, the output signal
frequency characteristic of the adder 3 is opposite. In this case, the insertion filter is a low pass
filter 12. The present invention is configured as described above, and according to the present
invention, the following effects can be obtained. 8 (1) Of the stereo signal components, it is
possible to make the reverberation signal addition amount added to the signal of the singer or
the like which is the central localization component smaller than that of the surrounding
localization component, and the change in the tone of the singer or the like is small. You can get
a sense of space. (It is possible to obtain the reverberant addition effect of the playback side
regardless of the recording situation of the stereo signal. (3) The phase characteristics of the
input signal to the reverberation circuit, the setting freedom to the signal level, and the effect
setting of the reproduction sound field can be arbitrarily set by the phase shifter and the filter
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