Resources Contact Us Home
Codec system and method

Image Number 8 for United States Patent #7239253.

A sound codec including a compression portion and a decompression portion. The compression portion separates the incoming sound packet bandwidth into frequency sub-bands using a bank of infinite impulse response (IIR) filters. In accordance with the invention, the lower frequency signals are divided into more sub-bands than the higher frequency signals. Once the signals are divided into sub-bands, each sub-band signal is quantized. The resulting signals of all of the quantized sub-bands are then sent out over a communications link along with the filter state at the end of each sound packet. The decompression portion recombines the individual sub-band signals together (using a bank of infinite impulse response (IIR) filters) to form the audio data using the filter states to configure the reconstruction.

  Recently Added Patents
Semiconductor light-receiving device
Shallow trench media
Humidity indicator and method for fabricating the same
Communication terminal, communication system, server apparatus, and communication connecting method
System and method for improving text input in a shorthand-on-keyboard interface
System and method for detecting states
Multibranched polymer and method for producing the same
  Randomly Featured Patents
Plasticized polyvinyl chloride compound
Soft-sided kennel cover
Method for electronic control of a hydraulic pump
Method for analyzing glycan structure
Shielded connector having modular construction
Drop target for a pinball game
Elevator dispatching employing reevaluation of hall call assignments, including fuzzy response time logic
Virtual object adjustment via physical object detection
Seawall using earth reinforcing mats
Neonatal valved manifold