Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Process for compressing data relative to voice signals and device applying said process










Image Number 4 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
Dielectric insulation medium
Method and apparatus for token-based context caching
Interference suppressing OFDM system for wireless communications
System and method of improving audio signals for the hearing impaired
Method for producing purified influenza virus antigen
Method and system for blocking hazardous information
Notebook computer
  Randomly Featured Patents
Stand stay stilts training kit
Method for constructing multiple container capacitor
Activator control method and apparatus for positioning a transducer using a phase plane trajectory trough function for a direct access storage device with estimated velocity and position state
Image display device
Manufacturing method of thin film transistor
Reducing configuration errors for managed services in computer networks
Information handling and control systems, and methods of testing the condition of electrical loads in such systems
Air-dryable resins and processes for preparing same
Method for producing maytansinol and its derivatives
Desk top electronic calculator