FM MODULATION MAGNETIC RECORDING AND REPRODUCING DEVICE FOR MULTICHANNEL SOUND SIGNAL

PURPOSE:To reproduce a sound free of waveform distortion by providing demodulation circuits corresponding to heads individually, and switching sound signals demodulated during an overlap period in which both resproducing heads scan on a magnetic tape at the same time. CONSTITUTION:Sound signals of t...

Full description

Saved in:
Bibliographic Details
Main Authors ITOU SHIGEYUKI, OWASHI HITOAKI, WATAYA YOSHIZUMI
Format Patent
LanguageEnglish
Published 10.01.1984
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
Online AccessGet full text

Cover

More Information
Summary:PURPOSE:To reproduce a sound free of waveform distortion by providing demodulation circuits corresponding to heads individually, and switching sound signals demodulated during an overlap period in which both resproducing heads scan on a magnetic tape at the same time. CONSTITUTION:Sound signals of two channels are recorded together with a video signal in such a way that a sound of one channel is FM-demodulated and frequency-multiplexed in the upper band of the sound band of the other sound and then they are FM-modulated at a time. Both FM sound signals are separated from the outputs of preamplifiers 24 and 25 individually through BPFs 51 and 52, and demodulated by demodulators 53 and 54. The 1st sound signal reproduced by reproducing heads 22 and 23 are sent from LPFs 55 and 56. The 2nd FM-modulated sound signal is reproduced by BPFs 57 and 58 and demodulated by demodulators 59 and 60. Changeover switches 63 and 64 are operated in the overlap period in which the signals are reproduced by reproducing heads 22 and 23 at the same time.
Bibliography:Application Number: JP19820111710