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
Spark plug
Viruses lacking epithelial cell receptor entry
Digital IF demodulator for video applications
Image forming apparatus and method
Combination therapy to enhance NK cell mediated cytotoxicity
Distylium plant named `PIIDIST-I`
  Randomly Featured Patents
Hydrocarbon conversion using molecular sieve SSZ-65
Laminate substrate having joining layer of photoimageable material
Radiating coaxial cable with improved flame retardancy
Plant stand
Apparatus for automatic compensation of wear upon orbiting knives in tobacco cutting machines or the like
Garment hanger
8,9-annelated-.beta.-carbolines and 8,9-annelated 3,4-dihydro-.beta.-carbolines
Electrical interconnection assembly
Interface switch for use with fibre channel fabrics in storage area networks
System and method to build a callgraph for functions with multiple entry points