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    • 30. 发明专利
    • CHANNEL SELECTOR
    • JPS5577282A
    • 1980-06-10
    • JP14994278
    • 1978-12-06
    • HITACHI LTD
    • HONDA AKIRANAKAGAWA JIYUNICHIHAGIWARA YOSHIMUNESAWASE TERUMITAKAI ATSUSHIKIDA YUUZOUFURUHATA MAKOTOSATOU MITSUNARI
    • H03J7/18H04N5/44
    • PURPOSE:To expand a correction extent and to realize LSI-implementaion by letting a variable voltage oscillator correct a code signal for channel selection by a turning error correction signal. CONSTITUTION:This channel selector consists of signal processing circuit 2 which generates control signal (b) turning ON-OFF the operation of an AFS (automatic frequency control) circuit, error correcting control signals (f) and (g) setting the output frequency of VCO to the best value, automatic search instruction signal (e), stop signal (h) and write instruction signal (i) of a work generator, and sweep speed change signal (j), work generator 3, D/A converter 4, LPF5, automatic search signal generating circuit 6, information memory 7 for obtaining the control voltage of voltage variable elements provided as many as needed channels, clock signal divider 8, clock pulse generator 9, etc. Further, TV main body 1 is provided with terminal 1-1 applying frequency control voltage (a) to a local oscillator for channel selection, terminal 1-2 for signal (b), terminal 1-3 for signal (c) obtained when a horizontal synchronizing signal is detected, and terminal 1-4 extracting output (d) of a frequency discriminator.