Apparatus for and method of digital signal processing

Details Apparatus for and method of digital signal processing Apparatus for and method of digital signal processing

1992-02-24

1994-03-08

Mai, Tan V.

Boots, shoes, and leggings

3647241, G06F 1531

Patent

active

052933296

ABSTRACT:
Apparatus for and a method of digital signal processing utilises a technique known as sub-band decomposition and reconstruction. A plurality of input channels are provided each of which is mixed with a vernier frequency correction. In a multiplexer implementation, a fast fourier transform (FET) weighted overlap-add demultiplexer is provided for decomposing each input channel into sub-bands. The sub-band outputs are decimated by a factor to the common input sampling rate of a multiplexer, the sub-bands from each channel then being passed into the appropriate ports of an FFT weighted overlap-add multiplexer by a switch matrix. The multiplexer reconstructs the individual channels, interpolates each channel up to the output sampling rate of the FDM signal, mixes each channel up to its assigned carrier frequency in the frequency division multiplexed (FDM) (FDM) and multiplexes the channels. This provides a computationally efficient architecture with the flexibility to accommodate channels of differing bandwidths.

REFERENCES:
patent: 4691292 (1987-09-01), Rothweiler
patent: 4829378 (1989-05-01), LeGall
patent: 4918524 (1990-04-01), Ansari et al.
Michael R. Portnoff, "Implementation of the Digital Phase Vocoder Using the Fast Fourier Transform", IEEE Transactions on Acoustics, Speech, and Singal Processing, vol. ASSP-24, No. 3, Jun. 1976, pp. 243-248.
S. Joseph Campanella et al., "A Flexible On-Board Demultiplexer/Demodulator", pp. 299-303, no publication date available.
R. E. Crochiere, "A Weighted Overlap-Add Method of Short-Time Fourier Analysis/Synthesis", IEEE Transactions on Acoustics, Speech, and Singal Processing, vol. ASSP-28, No. 1, Feb. 1980, pp. 99-102.

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