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

Image Number 5 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
Food safety printer
Communication apparatus and communication system
Liquid crystal display and method of driving the same
System and method for wireless messaging in a wireless communication system
Highly stable electrolytic water with reduced NMR half line width
Receiving security risk feedback from linked contacts due to a user's system actions and behaviors
Bezel-less electronic display
  Randomly Featured Patents
Sortation conveyor apparatus and methods
Image capture device for creating image data from a plurality of image capture data, and recording medium therefor
Method and apparatus for implementing a databus voter to select flight command signals from one of several redundant asynchronous digital primary flight computers
Production process of electrode catalyst for fuel cell
Protective directory cover
Golf tee setter
System for and method of evaluating mask patterns
Operation of a forward link acknowledgement channel for the reverse link data
Method of combinatorial weighing in a combinatorial weighing machine
Encoding for pit-per-transition optical data recording