Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1980-12-08
1982-11-30
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455169, 455192, 3581931, 3581951, H03J 702, H03J 722, H04N 550
Patent
active
043619088
ABSTRACT:
A channel search and selection system for a televison receiver, using a voltage synthesizer system, comprises a channel selection voltage generator for producing a continuously changing control voltage, an electronic tuner which receives this control voltage and a television signal of a channel corresponding to the control voltage to convert the television signal to an intermediate frequency signal, an amplifier for receiving and amplifying the intermediate frequency signal, and a frequency discriminator for receiving the amplified intermediate frequency signal and producing an output voltage according to the degree of deviation of the intermediate frequency signal from a predetermined frequency. This output voltage is fed to the channel selection voltage generator circuit for controlling the control voltage. The system also comprises a television signal state discriminator for detecting whether or not the electronic tuner is correctly receiving a television signal and producing an output signal when it is not, and a voltage holding means for receiving the output signal produced from the television signal state discriminator circuit and also the control voltage supplied from the channel selection voltage generator circuit and preventing the variation of the control voltage during the presence of the output signal from the television signal state discriminator circuit. Thus, even when the television signal of the selected channel temporarily vanishes or is reduced in its intensity level, the control voltage supplied to the electronic tuner does not vary, so the electronic tuner is held ready for again receiving the selected channel television signal.
REFERENCES:
patent: 3737787 (1973-06-01), Wolfram
patent: 3753172 (1973-08-01), Sakamoto
patent: 3968441 (1976-07-01), Garskamp
patent: 3980968 (1976-09-01), MA
patent: 4240115 (1980-12-01), Kamiya
patent: 4295165 (1981-10-01), Watanabe et al.
Hitachi , Ltd.
Ng Jin F.
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