Electrical audio signal processing systems and devices – Binaural and stereophonic
Patent
1986-10-17
1988-04-05
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
381 98, 381109, H04S 100
Patent
active
047364262
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a circuit for localization shift of a sound image and is optimum for use in a stereo system.
BACKGROUND ART
Normally, a graphic equalizer can adjust levels in each of a plurality of divided bands and set a frequency correction curve by some visible means. By using such a graphic equalizer, a sound image or a tone color of a musical instrument or the like which occupies a specific band can be changed. However, localization of the musical instrument can be shifted to some extent but smooth shift and shift operation with natural feeling cannot be obtained by the graphic equalizer.
DISCLOSURE OF THE INVENTION
The present invention has been made in consideration of the above problems, and has as its object to shift freely the sound image, distinctly in response to a shift operation with natural feeling.
A graphic balancer of the present invention has level adjusting means for increasing or decreasing signal levels of sound signals of two channels in individual bands. The level adjusting means of the two channels are synchronously operated in opposite directions, so that the levels can be increased at one channel and decreased at the other. Thus, levels of right and left channels can be balanced in individual bands.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a basic circuit diagram of a graphic balancer according to one embodiment of the present invention;
FIG. 2 is a circuit diagram according to another embodiment of the present invention in which a graphic equalizer and a graphic balancer employs a common circuit and is switched over to use;
FIG. 3 is a circuit diagram according to still another embodiment of the present invention in which a graphic equalizer and a graphic balancer are switched in individual bands;
FIG. 4 is a basic circuit of a graphic equalizer.
BEST MODE OF CARRYING OUT THE INVENTION
Before describing the present invention, a basic circuit of a conventional graphic equalizer will be described below with reference to FIG. 4. A circuit shown in FIG. 4 is for one of a plurality of divided bands and has operational amplifiers 1L and 1R and resonators 2L and 2R for right and left channels. The resonators 2L and 2R are connected to movable terminals of volume controls 3L and 3R whose middle points are grounded. The volume controls 3L and 3R are connected between output terminals and negative feedback input terminals of the operational amplifiers 1L and 1R.
The right and left volume controls 3L and 3R are synchronized. When both of the movable terminals thereof are moved to the left in FIG. 4, levels of the negative feedback input terminals of the operational amplifiers 1L and 1R are decreased by the resonators 2L and 2R according to a voltage division ratio of negative feedback resistors 4L and 4R and the volume controls 3L and 3R, thereby increasing an output level of this band. When the movable terminals of the volume controls 3L and 3R are moved to the right in FIG. 4, the voltage division ration which is determined by output resistors 5L and 5R of the operational amplifiers 1L and 1R and by the volume controls 3L and 3R is varied by the resonators 2L and 2R, thereby attenuating an output level of this band. The output levels of right and left channels are amplified or attenuated in the same direction.
FIG. 1 shows a basic circuit of a graphic balancer according to one embodiment of the present invention. The circuit shown in FIG. 1 is substantially the same as that of the graphic equalizer shown in FIG. 4 except that the movable terminals of the volume controls 3L and 3R in the left and right channels are synchronously moved in opposite directions. More specifically, when the volume control 3L in the left channel is moved to the left to increase the output gain, the movable terminal of the volume 3R in the right channel is moved to the right, thereby decreasing the output level. In this case, a musical instrument having its root near f.sub.0 of the resonators 2L and 2R is moved to the left channel in terms of acoustic image. This also
REFERENCES:
patent: 3195067 (1965-07-01), Klein et al.
patent: 4046960 (1977-09-01), Veale
patent: 4577540 (1986-03-01), Yamana
patent: 4612665 (1986-09-01), Inami et al.
Ide Teruhisa
Kinoshita Tsutomu
Ohtsu Masahiro
Isen Forester W.
Sony Corporation
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