JPH0260383U

JPH0260383U -

Info

Publication number: JPH0260383U
Application number: JP13978688U
Authority: JP
Priority date: 1988-10-26
Filing date: 1988-10-26
Publication date: 1990-05-02

Description

[Brief explanation of drawings]

第１図、第２図は本考案の磁気再生装置に用い
られる輝度信号再生回路の第１及び第２実施例構
成図、第３図は従来の磁気再生装置に用いられる
輝度信号再生回路の構成図である。２……高域フイルタ回路、３，６，１３，１６
，２０，２３……リミツタ回路、４，８……低域
フイルタ回路、５，１８，２１，２４……加算回
路、７，１４，１７……ＦＭ復調回路、９……デ
イエンフアシス回路、１２，１９，２５……非反
転増幅回路、１５，２２，２６……反転増幅回路
、……ダブルリミツタ回路。 1 and 2 are configuration diagrams of first and second embodiments of a luminance signal reproducing circuit used in the magnetic reproducing device of the present invention, and FIG. 3 is a configuration diagram of a luminance signal reproducing circuit used in a conventional magnetic reproducing device. It is a diagram. 2...High frequency filter circuit, 3, 6, 13, 16
, 20, 23... Limiter circuit, 4, 8... Low-pass filter circuit, 5, 18, 21, 24... Addition circuit, 7, 14, 17... FM demodulation circuit, 9... De-emphasis circuit, 12, 19, 25... Non-inverting amplifier circuit, 15, 22, 26... Inverting amplifier circuit,... Double limiter circuit.

Claims

[Claims for Utility Model Registration] (1) A magnetic reproducing device equipped with a luminance signal reproducing circuit that demodulates a magnetically recorded FM signal to obtain a reproduced luminance signal, wherein the luminance signal reproducing circuit reproduces an FM luminance signal. a high-pass filter circuit that obtains a high-frequency signal from the FM luminance signal; a low-pass filter circuit that obtains a low-pass signal from the FM luminance signal; a first limiter circuit that removes noise near the carrier frequency from the high-frequency signal; a first adder circuit that outputs an added signal obtained by adding the low-frequency signal to the output signal of the first limiter circuit; and a second limiter that outputs a first limiter signal with the same amplitude of the added signal. circuit and
a first FM demodulation circuit that demodulates the first limiter signal; a third limiter circuit that outputs a second limiter signal having the same amplitude as a signal having a polarity opposite to that of the addition signal; and the second limiter circuit. a second FM demodulation circuit that demodulates the signal; and a second FM demodulation circuit that outputs an added demodulated signal obtained by adding the first and second demodulated signals.
1. A magnetic reproducing device comprising: an adding circuit; and a de-emphasis circuit that de-emphasizes a signal corresponding to the added demodulated signal and outputs the reproduced luminance signal. (2) A magnetic reproducing device comprising a luminance signal reproducing circuit that demodulates a magnetically recorded FM signal to obtain a reproduced luminance signal, the luminance signal reproducing circuit comprising: a high frequency signal reproducing circuit that obtains a high frequency signal from the FM luminance signal a first limiter circuit that outputs a first limiter signal obtained by removing noise near the carrier frequency from a signal corresponding to the high frequency signal; a second limiter circuit that outputs a second limiter signal obtained by removing noise near the carrier frequency from an inverted high-frequency signal obtained by inverting the polarity of the high-frequency signal; a first addition circuit that outputs a first added signal obtained by adding a signal corresponding to the low-frequency signal to the first limiter signal; a second addition circuit that outputs a second addition signal obtained by adding signals corresponding to the inverted low-frequency signal obtained by the above-mentioned inverted low-frequency signal; third and fourth limiter circuits that output third and fourth limiter signals; first and second FM demodulation circuits that demodulate the third and fourth limiter signals;
a third addition circuit that outputs an added demodulated signal obtained by adding the first and second demodulated signals; and a de-emphasis circuit that de-emphasizes a signal corresponding to the added demodulated signal and outputs the reproduced luminance signal. A magnetic reproducing device comprising: