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
Systems and methods for managing data incidents
Tablet case
Method and apparatus for detecting a table of contents and reference determination
Portable wideband antenna-radiated signal generator
Cable connector
User interface for stylus-based user input
  Randomly Featured Patents
Apparatus for cleaning a steam generator by means of a high-pressure lance
Equipment and method for measuring transmittance of photomask under off axis illumination
Ultrasonic bone testing apparatus with repeatable positioning and repeatable coupling
Strain relief connector for fiber optic cable and method of making same
Method of manufacturing metal-semiconductor contacts exhibiting high injected current density
Electrophoretic development
Camera having focus detecting optical system
Process for preparing 5,11-diazatetracyclododecanes
Method for visual programming with aid of animation
Soybean variety A1024198