发明名称 |
SOUND FIELD EXPANSION SYSTEM FOR A VIDEO TAPE RECORDER |
摘要 |
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. |
申请公布号 |
CA1310747(C) |
申请公布日期 |
1992.11.24 |
申请号 |
CA19860523926 |
申请日期 |
1986.11.27 |
申请人 |
SONY CORPORATION |
发明人 |
MITSUHASHI, TAKAMICHI;TOMIOKA, MASAO |
分类号 |
G11B5/027;G11B20/00;H04N5/92;H04N5/928;H04S1/00 |
主分类号 |
G11B5/027 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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