Resources Contact Us Home
Two-stage compression and expansion of coupling processed multi-channel sound signals for transmission and recording

Image Number 3 for United States Patent #5873065.

A multi-channel signal compressor for compressing digital sound signals in the respective channels of a multi-channel sound system. The apparatus comprises a first-stage compression system and a second-stage compression system. In the first-stage compression system, a coupling circuit performs coupling between the digital sound signals of at least two of the channels to generate coupling-processed signals, one for each of the channels. A compressor circuit receives the coupling-processed signals from the coupling circuit and frequency divides each coupling-processed signal into frequency range signals in respective frequency ranges, and compresses the frequency range signals obtained by dividing each coupling-processed signal to generate a first-stage compressed signal. In the second-stage compression system, a determining circuit receives the first-stage compressed signal for each channel from the first-stage compression system and determines an energy for each channel from the first-stage compressed signal of the respective channel. A channel bit apportionment decision circuit operates in response to the determining circuit, and apportions a predetermined number of bits among the channels to apportion a number of bits to each channel. Finally, an additional compressor additionally compresses the first-stage compressed signal of each channel using, for each channel, the number of bits apportioned to the respective channel by the channel bit apportionment decision circuit.

  Recently Added Patents
Method and system for detecting data modification within computing device
Electronic product design
Sign language keyboard and sign language searching apparatus using the same
3D structured memory devices and methods for manufacturing thereof
5-HT.sub.3 receptor modulators, methods of making, and use thereof
Methods of operating non-volatile memory devices during write operation interruption, non-volatile memory devices, memories and electronic systems operating the same
Architectural panel with Tarwe and grass
  Randomly Featured Patents
Pass-thru electrical connector assembly
Tool of cemented carbide for cutting, punching or nibbling
Geospatial modeling system providing windowed geospatial model data inpainting and related methods
Scorch resistant, crosslinkable composition containing mixture of copper and metal dithiocarbamates
Apparatus, method, and software for limiting session rates in a computer network
Domain name service system and method thereof
Comparator for chemical testing of water
Vehicle suspension system
Method for adaptation of pressure of an overlapping upshifting
Restriction detecting systems for clothes dryer exhaust systems