Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1997-09-03
2000-05-16
Hunter, Daniel S.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551923, 455255, 455257, H04B 110
Patent
active
060648678
ABSTRACT:
A receiving apparatus is disclosed which comprises: a receiving circuit for receiving time-division-duplexed first and second radio wave paging signals, having the same carrier frequency, including first and second data having different first and second data rates respectively, a frequency converting circuit for frequency-converting an output of the receiving circuit with a local oscillation signal from a local oscillator; a demodulator for demodulating an output of the frequency converting circuit and outputting a demodulated signal; a detection circuit for detecting the synchronizing word from the demodulated signal, detecting whether a frame synchronizing condition is established, and detecting whether the first radio wave signal is being received; a frequency error detection circuit for detecting a frequency error in the output of the demodulation means; and a frequency control circuit responsive to the detection circuit for controlling a local oscillation frequency of the local oscillator according to the detected frequency error only while the first radio wave signal is being received. Automatic frequency controlling is effected only during the interval of receiving the desired radio wave paging signal.
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Hunter Daniel S.
Matsushita Electric - Industrial Co., Ltd.
Nguyen Thuan T.
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