Patent ID: 6990157

Claim:
A digital FSK demodulation apparatus, comprising: a first input for receiving an IF signal; a digital frequency determiner coupled to said first input for producing digital information indicative of a frequency of said IF signal in response to said IF signal; a digital symbol determiner coupled to said digital frequency determiner and responsive to said digital information for determining a symbol represented by said frequency of said IF signal; and a resolution adjuster coupled between said digital frequency determiner and said digital symbol determiner for processing said digital information over time to produce time-processed digital information, said digital symbol determiner responsive to said time-processed digital information for determining said symbol; wherein the resolution adjuster includes a latch coupled to said digital frequency determiner for respectively maintaining a previous instance of said digital information; an adder coupled to said digital symbol determiner and said latch for adding said digital information to said previous instance of said digital information to produce said time-processed digital information, and a gating circuit having an input coupled to said latch and having an output coupled to said adder for gating to said adder selected ones of said digital information and said previous instance of said digital information.