Resources Contact Us Home
Process for compressing data relative to voice signals and device applying said process

Image Number 2 for United States Patent #4216354.

A voice signal is transmitted digitally at reduced bit rate by use of data compression. The original frequency components of a telephone band width of the voice signal sampled at 8 KHz and quantized with 12 bits are transformed into three parameters: SIGNAL data representing adaptive quantization for lower frequency (300-800 Hz) sub-bands; COEF data representing pre-emphasized parcor type coefficients for the higher frequency (800-3000 Hz) band; and, ENERGY data representing higher frequency short term energy level. The three parameters are multiplexed for transmission in binary-code form, thereby representing a recoding of the original binary-coded voice signals.

  Recently Added Patents
System for implementing dynamic pseudorandom keyboard remapping
Method for processing power headroom and terminal thereof
Method for controlled layer transfer
Systems and methods for universal enhanced log-in, identity document verification and dedicated survey participation
Portion of a display panel with an ambiguous facial expression icon
Use of a high-oleic and high-tocol diet in combination with a non-tocol antioxidant for improving animal meat quality
Vehicle wheel rim protector
  Randomly Featured Patents
Bistable nematic liquid crystal which remains tilted in first and second states and which is tilted according to driving voltage
Door pull
Aspartic acid derivative-containing compositions and use thereof in stimulating and/or regulating plant and plant precursor growth
Duplex profile connector assembly having retention means for assembling upper and lower connectors thereof together
Putter type golf club
Semiconductor package substrate structure and manufacturing method thereof
Aqueous preparations for treating textile substrates comprising regenerated cellulose
Failure detection in lighting systems
Wheel suspension arrangement
Methods and apparatus for interfacing between a flash memory controller and a flash memory array