SECAM SIGNAL PROCESSING CIRCUIT

SECAM SIGNAL PROCESSING CIRCUIT

PURPOSE:To stably reproduce an FM chroma signal by providing a FMAGC circuit for stabilization of the reproducing level of a low band converted FM chroma signal between a regenerative preamplifying circuit and an FM limiter circuit and supplying the output signal of the FMAGC circuit to the FM limit...

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Hauptverfasser: AOI YOSHIHIRO, FUJIMURA TERUO
Format: Patent
Sprache:eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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creator AOI YOSHIHIRO
FUJIMURA TERUO
description PURPOSE:To stably reproduce an FM chroma signal by providing a FMAGC circuit for stabilization of the reproducing level of a low band converted FM chroma signal between a regenerative preamplifying circuit and an FM limiter circuit and supplying the output signal of the FMAGC circuit to the FM limiter circuit. CONSTITUTION:An FMAGC circuit 19 to stabilize the level of a 1/4 FM chroma signal is provided in the preceding stage of an FM limiter circuit 12. The output signal of a regenerative preamplifying circuit 2 is supplied to the FM limiter circuit 12 through a low pass filter 11 after being variably amplified by the circuit 19 so that the FM signal component has a certain amplitude. At this time, the output signal of the circuit 19 has a sufficiently large amplitude whether the reproduced output of a magnetic head 1 has a large amplitude exceeding a certain value or a small amplitude. Consequently, the 1/4 FM chroma signal of the low pass filter 11 based on the output signal of the circuit 19 always has the amplitude by the FM limiter circuit 12 to have a certain amplitude independently of the reproduced output of the magnetic head 1.
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CONSTITUTION:An FMAGC circuit 19 to stabilize the level of a 1/4 FM chroma signal is provided in the preceding stage of an FM limiter circuit 12. The output signal of a regenerative preamplifying circuit 2 is supplied to the FM limiter circuit 12 through a low pass filter 11 after being variably amplified by the circuit 19 so that the FM signal component has a certain amplitude. At this time, the output signal of the circuit 19 has a sufficiently large amplitude whether the reproduced output of a magnetic head 1 has a large amplitude exceeding a certain value or a small amplitude. Consequently, the 1/4 FM chroma signal of the low pass filter 11 based on the output signal of the circuit 19 always has the amplitude by the FM limiter circuit 12 to have a certain amplitude independently of the reproduced output of the magnetic head 1.</description><language>eng</language><subject>ELECTRIC COMMUNICATION TECHNIQUE ; ELECTRICITY ; PICTORIAL COMMUNICATION, e.g. TELEVISION</subject><creationdate>1992</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19920228&amp;DB=EPODOC&amp;CC=JP&amp;NR=H0463090A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76289</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19920228&amp;DB=EPODOC&amp;CC=JP&amp;NR=H0463090A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>AOI YOSHIHIRO</creatorcontrib><creatorcontrib>FUJIMURA TERUO</creatorcontrib><title>SECAM SIGNAL PROCESSING CIRCUIT</title><description>PURPOSE:To stably reproduce an FM chroma signal by providing a FMAGC circuit for stabilization of the reproducing level of a low band converted FM chroma signal between a regenerative preamplifying circuit and an FM limiter circuit and supplying the output signal of the FMAGC circuit to the FM limiter circuit. CONSTITUTION:An FMAGC circuit 19 to stabilize the level of a 1/4 FM chroma signal is provided in the preceding stage of an FM limiter circuit 12. The output signal of a regenerative preamplifying circuit 2 is supplied to the FM limiter circuit 12 through a low pass filter 11 after being variably amplified by the circuit 19 so that the FM signal component has a certain amplitude. At this time, the output signal of the circuit 19 has a sufficiently large amplitude whether the reproduced output of a magnetic head 1 has a large amplitude exceeding a certain value or a small amplitude. 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CONSTITUTION:An FMAGC circuit 19 to stabilize the level of a 1/4 FM chroma signal is provided in the preceding stage of an FM limiter circuit 12. The output signal of a regenerative preamplifying circuit 2 is supplied to the FM limiter circuit 12 through a low pass filter 11 after being variably amplified by the circuit 19 so that the FM signal component has a certain amplitude. At this time, the output signal of the circuit 19 has a sufficiently large amplitude whether the reproduced output of a magnetic head 1 has a large amplitude exceeding a certain value or a small amplitude. Consequently, the 1/4 FM chroma signal of the low pass filter 11 based on the output signal of the circuit 19 always has the amplitude by the FM limiter circuit 12 to have a certain amplitude independently of the reproduced output of the magnetic head 1.</abstract><oa>free_for_read</oa></addata></record>
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subjects ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
title SECAM SIGNAL PROCESSING CIRCUIT
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