Architecture for an AM/FM digital intermediate frequency radio

Details Architecture for an AM/FM digital intermediate frequency radio Architecture for an AM/FM digital intermediate frequency radio

2006-10-17

2006-10-17

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Convertible to different type

C455S196100, C455S205000, C455S323000, C375S324000

Reexamination Certificate

active

07123892

ABSTRACT:
An AM/FM DIF radio has an IF to audio converter that provides an audio signal from an IF signal responsive to a clock signal. During the processing of the IF signal, a spurious signal is intentionally generated. The spurious signal is based on the predetermined offset which is included in the IF signal applied to an A/D converter. The predetermined offset is greater than or equal to half of the AM bandwidth and less than or equal to the system bandwidth. The spurious signal is generated at a frequency proportional to the sum of an imprecision offset and the predetermined offset. A low pass filter removes the spurious signal while preserving the desired portion of the audio signal.

REFERENCES:
patent: 4470147 (1984-09-01), Goatcher
patent: 4688264 (1987-08-01), Miura
patent: 5387913 (1995-02-01), Park et al.
patent: 5732337 (1998-03-01), Wargnier et al.
patent: 6002924 (1999-12-01), Takano
patent: 2001/0044285 (2001-11-01), Hirayasu

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