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
Plants and seeds of hybrid corn variety CH367819
Manufactured product configuration
Wound dressings
Transferring a document
Method and apparatus for wireless communication in a mesh network with central control of communication relationships
Memristive junction with intrinsic rectifier
Strongly bound carbon nanotube arrays directly grown on substrates and methods for production thereof
  Randomly Featured Patents
Flexible coolant conduit and method of making same
Polymmonium-polysiloxane compounds, methods for the production and use thereof
Carrier housing
Coding system
Instrument for aiding in property shoeing a horse
High-speed level shifter with simple circuit arrangement
Fastener for cover member and cover assembly comprised thereof
Touch sensing device and method
Sperm collection device
Water purification pitcher