Resources Contact Us Home
Speech coding system using variable threshold values for noise reduction

Image Number 2 for United States Patent #4918734.

A speech coding system includes apparatus for generating a variable threshold dependent upon the power of an input speech signal, and a comparator for comparing the power of the input speech signal with the variable threshold value to generate a discriminating signal for discriminating between a period when a speech continues and a period when the speech pauses, to change the coding operation for the input speech signal in accordance with the level of the discriminating signal, thereby forming voiced and unvoiced frames independently of each other.

  Recently Added Patents
Automated hotfix handling model
Systems and methods for providing power and data to lighting devices
Method and apparatus for displaying system status with a wide range of viewing angle
Modular authoring and visualization of rules using trees
Systems of an electronic device and methods for manufacturing the same
Method and system to generate finite state grammars using sample phrases
Semiconductor device having a bonding pad and shield structure of different thickness
  Randomly Featured Patents
Electronic calculator with telephone dialer
Audio-video synchronization for digital systems
Transmission drive unit with a zero axial backlash bearing fastening, in particular for adjusting a movable part in a motor vehicle
Pyridinylamino tricyclic compounds as substance P antagonists
Density control for electroplatable polymer compositions
Method for identifying extender text table of electronic program guide in digital TV
Digital camera
Microprocessor system with multiple interrupts masked for use in electronic control or monitoring of various solid-state products
Parabolic correction signal amplitude control loop
Apparatus for texture processing of magnetic disk