Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Patent
1996-04-16
1998-10-13
Chin, Stephen
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
704205, 704500, H04B 166
Patent
active
058223703
ABSTRACT:
The input signal is filtered by bandpass filters having different passbands. These filtered signals are input to power detectors that average the power present in each band. A comparator compares each power level signal to a predetermined power threshold to determine if information is present in any of the bands. If information is present in the upper bands, the information is transformed by a discrete wavelet transform and is thresholded and then shifted to the lower bands. The process by which the shifting operation was accomplished is stored in a code book band. An inverse wavelet transform generates the compressed signal by transforming the signals from the wavelet domain to the time domain. If the signal was compressed, the code book signal is transmitted with the compressed signal to a receiving unit for decompression. If the signal was not compressed, the code book signal and the original input signal is transmitted to the receiving unit. The receiving unit receives the transmitted signal and reconstructs the original input from the transmitted signal, either directly or by re-spreading and transforming the compressed signal from the transmitted signal responsive to the code book signal embedded with the transmitted signal.
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Aura Systems, Inc.
Chin Stephen
Ghayour Mohammed
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