The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 16, 2000
Filed:
Sep. 03, 1997
Makoto Takemoto, Yokohama, JP;
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.