Multi-directional stereo multiple recording apparatus with constant acceleration cutting
AssigneeNippon Columbia Co., Ltd.
InventorYoshihisa Kamo
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Abstract
A multi-directional stereo multiple recording and reproducing apparatus is disclosed in which a plurality of sound source signals are encoded to a plurality of main- and sub-channel signals, the encoded main-channel signals and a carrier signal of a frequency f.sub.c which is angle-modulated with the sub-channel signals are mixed through a filter circuit, and the modulated signal is recorded on a lacquer master disc by a constant acceleration cutting and then reproduced therefrom.
Claims10
A multi-directional stereo multiple recording apparatus comprising:
- a. encoder means for encoding a plurality if input signals corresponding to a plurality of sound sources in a plurality of main-channel signals and sub-channel signals;
- b. mixer means for producing a multiplex signal;
- c. means for applying said main-channel signals from said encoder means to said mixer means;
- d. angle-modulator means for angle-modulating a carrier signal of a given frequency by said sub-channel signals to produce modulated sub-channel signals;
- e. filter means for further modulating at a constant acceleration said modulated sub-channel signals interposed between said angle-modulator means and for applying said modulated sub-channel signals to said mixer means;
- and
- f. cutter means for recording the output of said mixer means on a groove of a lacquer disc.
A method for recording sound on a lacquer disc by engraving said disc in a constantly accelerating cut, comprising the steps of encoding a plurality of input signals corresponding to a plurality of sound sources in a plurality of main channel signals and sub-channel signals, causing said sub-channel signals to angle modulate a carrier signal of predetermined frequency to produce modulated sub-channel signals, filtering said modulated sub-channel signals to further modulate said sub-channel signals to a constant acceleration responsive to the engraving of said disc, applying said main-channel signal and said accelerated sub-channel signals to a mixer and thereafter applying said mixed signal to an engraving stylus for engraving said disc.
Dependencies are inferred from the claim text.