Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Optical fixing device and image forming apparatus
Vehicle wheel rim protector
Antenna array system
Communication device
Method for determining an object class of an object, from which light is emitted and/or reflected to a vehicle
Autobrake and decel control built-in test equipment
State control of remote hosts for management of distributed applications
  Randomly Featured Patents
Pig launcher/receiver
Anti-friction device
Method of utilizing polyacrylic hot-melt adhesives
Bike rack
Mat base plate
Thread cutting die and method of manufacturing same
Automatic power control circuit for use with a radio telecommunication apparatus
Elongated twin feed line RFID antenna with distributed radiation perturbations
Broadcast communication system and method for providing users with information associated with a geographical area
Headlamp for vehicle