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Title: Multichannel record disc recording system
Abstract:
A multichannel record disc recording system comprises automatic gain control circuits for each of the multichannels a control voltage, representing the phases and levels of the multichannel signals, control the gain of the automatic gain control circuits. An operational circuit at the output of the automatic gain control circuits produces an output sum signal and a difference signal. The difference signal, is angle modulated and multiplexed with the sum signal. The resulting multiplexed signal is recorded on a record disc. Each of the automatic gain control circuits carries out a gain control operation so that the maximum level of the output sum signal does not exceed a predetermined level, and the maximum level of the output signal of the automatic gain control circuit exceeds one half of the predetermined level.
Other info: Inventors: Sasamura, Kohei (Sagamihara, JA) Ishigaki, Yukinobu (Yamato, JA) Application Number: 462648 Filing Date: 1974-04-22 Publication_date: 1976-04-27 Assignee: Victor Company of Japan, Ltd. (Yokohama, JA) Primary Class(es): 369/47.16 369/47.25, 369/88, 369/90, 369/175, 381/20 Other Classes: US Patent Ref:
Other Refs: Other References: "4-Channel Matrix How Good Is It?" by Walters Radio-Electronics Mar. 1973 pp. 35-38. | |