Pulse or digital communications – Equalizers
Reexamination Certificate
2007-01-23
2007-01-23
Phu, Phuong (Department: 2611)
Pulse or digital communications
Equalizers
C375S232000, C381S103000
Reexamination Certificate
active
10974233
ABSTRACT:
A system (10) and method (50) of equalizing an audio signal from a factory installed radio (30) using an interface unit (10) between the factory installed radio and a replacement load (34) can include the steps of measuring (52) an existing equalization for the factory installed radio in the interface unit, analyzing (64) the existing equalization to provide a measure of an existing frequency response suited for an old load, generating (66) a substantially inverted frequency response to the existing frequency response, and applying (74) the inverted frequency response to the replacement load to provide a desired response. Such as system can include an interface unit (12) having an automatic input level control unit (14), an analog to digital converter or digitizer (16), a DSP (18) providing an output to a DAC (20), a level booster unit (22) and a processor such as a microcontroller unit (24).
REFERENCES:
patent: 4227046 (1980-10-01), Nakajima et al.
patent: 4748669 (1988-05-01), Klayman
patent: 5319713 (1994-06-01), Waller et al.
patent: 6115476 (2000-09-01), O'Conner et al.
Audiocontrol, “EQS Owner's Enjoyment Manual,” 1-18, 2001.
Kelly Campbell
Lindquist Carl
Macmillan Bruce
Matro Felix
Smith Manville
Akerman & Senterfitt
JL Audio, Inc.
Meles Pablo
Phu Phuong
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