G - Physics – 11 – B
Patent
G - Physics
11
B
352/11, 352/20
G11B 20/00 (2006.01) G11B 20/12 (2006.01) H04N 5/92 (2006.01)
Patent
CA 1310747
ABSTRACT OF THE DISCLOSURE A sound field expansion system applicable to a magnetic recording and reproducing apparatus (VTR) which can expand the sound field in a simple construction. In the sound field expansion system. a circuitry for virtually forming two comb filter characteristics is provided by adding a first audio signal and a second audio signal delayed by a predetermined interval of time with respect to the first audio signal and adding the first audio signal which is passed through a phase shift circuit which shifts the phase of the first audio signal so that the reproduced sound field can remarkably be expanded. Furthermore. a correction circuit for providing a predetermined frequency characteristic for the first or second audio signal is installed so that an acoustic image having a desired frequency band can be positioned. The first and second audio signals may be monaural or stereophonic and are derived from demodulations of audio frequency-modulated (AFM) signal recorded on a common track of a magnetic tape together with a one-field video signal in a frequency division multiplex mode and time-axis-compressed pulse-code- modulated audio (PCM) signal recorded on the common track together with the one-field video signal in a time share mode.
523926
Mitsuhashi Takamichi
Tomioka Masao
Gowling Lafleur Henderson Llp
Sony Corporation
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