Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1979-02-06
1981-01-27
Richardson, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455232, 455226, 455177, 363 60, 307264, H04B 116, H03J 312
Patent
active
042479495
ABSTRACT:
An input signal is applied to a first limiting amplifier circuit, and an output of the first limiting amplifier circuit is applied to a second limiting amplifier circuit. An output of the second limiting amplifier circuit is applied to a third limiting amplifier circuit. The output signal of the first limiting amplifier circuit is applied to a first detector circuit, the output signal of the second limiting amplifier circuit is applied to a second detector circuit, and the output signal of the third limiting amplifier circuit is applied to a third detector circuit. Bias means for stipulating the bias states of the first, second and third detector circuits are coupled to the third detector circuit. An output signal of the third detector circuit is applied to the second detector circuit as a bias signal, and an output signal of the second detector circuit is applied to the first detector circuit as a bias signal. An output signal of the first detector circuit exhibits a level corresponding to the sum among the output signals of the first, second and third limiting amplifier circuits.
REFERENCES:
patent: 3673499 (1972-06-01), Avins et al.
patent: 3701022 (1972-10-01), Graft
patent: 3727138 (1973-04-01), Traub
patent: 3753120 (1973-08-01), Ohasawa
patent: 3932768 (1976-01-01), Takahashi et al.
patent: 4059802 (1977-11-01), Ohsawa et al.
patent: 4109206 (1978-08-01), Namata
Homma Makoto
Ienaka Masanori
Kominami Yasuo
Watanabe Kazuo
Chin Tommy P.
Hitachi , Ltd.
Richardson Robert L.
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