Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Reexamination Certificate
2007-01-02
2007-01-02
Ngo, Chuong D. (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
Reexamination Certificate
active
10651402
ABSTRACT:
An architecture for a biquad (70), second-order infinite impulse response (IIR) digital filter, that is capable of operating at maximum efficiency, is disclosed. The biquad (70) includes coefficient memory (50) and data memory (52), along with control circuitry (53) that loads values from these memories (50, 52) into a coefficient register (52) and a data register (54), respectively. A multiplier (55) multiplies the values in the coefficient register (52) and data register (54), with the resulting product being stored in a product register (58). An accumulator (59) adds successive product results to derive a new output value in each instance of the IIR filter. A shadow register (60) temporarily stores the output of the accumulator (59) from a previous instance, permitting this output to be stored in the data memory (52) at a later time in the sequence. This permits the order of operations in the second and successive biquads to be altered so that each successive biquad instance can start well before the previous result is derived; as a result, the multiplier (55) is fed with values each cycle, enabling maximum efficiency operation.
REFERENCES:
patent: 4117541 (1978-09-01), Ali
patent: 4228517 (1980-10-01), Constant
patent: 4561065 (1985-12-01), Matsuda
patent: 6584481 (2003-06-01), Miller
Allred et al., “A Low Cost, High-Performance, Digital Audio Processor”, Silicon for Audio—16th UK Conference (AES, 2001), pp. 57-63.
TAS3103 Digital Audio Processor with 3D Effects Data Manual (Texas Instruments, Oct. 2002).
Brady III W. James
Ngo Chuong D.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
LandOfFree
Biquad digital filter operating at maximum efficiency does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Biquad digital filter operating at maximum efficiency, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Biquad digital filter operating at maximum efficiency will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3763397