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:
Sep. 22, 1998
Filed:
Feb. 01, 1996
James A Hutchinson, IV, San Diego, CA (US);
Jan C Ault, Santee, CA (US);
Qualcomm Incorporated, San Diego, CA (US);
Abstract
A system and method for processing wideband data within digital FM transceiver. A digital FM demodulator within the transceiver produces a demodulated information signal in response to the FM signal. The digital FM receiver also includes a wideband message processing section for recovering message information from the demodulated information signal. A word register circuit within the wideband message processing section stores one or more repetitions of a message word recovered from the demodulated information signal. During operation of the FM receiver in a control channel mode, a dotting detector within the wideband processing section is used for detecting a first dotting sequence within the demodulated information signal. Similarly, the dotting detector serves to detect a second dotting sequence within the demodulated information signal during operation in a voice channel mode. A word sync sequence is also identified within the demodulated information signal prior to storage of the one or more repetitions of the received message word within the word register circuit. A reconstructed message word is then generated by comparing corresponding bits within the one or more repetitions of the one message word. A message prefilter determines whether a processor interrupt should be generated by ascertaining whether the reconstructed message word is of a predefined type. A digital FM transmitter of the transceiver is controlled on the basis of busy-idle channel status information recovered from the demodulated information signal.