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
System and method for displaying a constant time selection context menu interface
Re-establishing push notification channels via user identifiers
Systems and methods for determining muscle force through dynamic gain optimization of a muscle PID controller for designing a replacement prosthetic joint
Solid-state imaging device
Polar nematic compounds
Shoe upper
Methods and systems for determining the reliability of transaction
  Randomly Featured Patents
Range-finder, three-dimensional measuring method and light source apparatus
Coolable blade
Branch connection in a high pressure fuel rail with gasket
Method for the static analysis of concurrent multi-threaded software
Window frame profile
Valve operating mechanism for internal combustion engine
Semiconductor laser device having a COD-preventing structure
Tissue material process for forming bioprosthesis
Cross-connection architecture for SDH signals comprising time-and-space division switch groups