Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Dynamic balance control for telephone










Image Number 8 for United States Patent #6990194.

A telephone includes a transmit channel and a receive channel, each including a bank of sub-band filters having a VAD coupled one to each sub-band filter. Each VAD measures the spectral energy in a sub-band, compares the spectral energy to a first threshold, and produces an output signal representative of whether or not the first threshold is exceeded. The voice activity detector also includes a threshold circuit for calculating a dynamically adjustable noise threshold based upon averaged measured spectral energy. A wide band or system VAD monitors echo canceling circuitry to detect voice activity and double talk. A dynamic balance control circuit maintains the transmit and receive channels in a predetermined energy ratio during double talk.








 
 
  Recently Added Patents
Circuitry for measuring and compensating phase and amplitude differences in NDT/NDI operation
Self-service administration of a database
Image forming apparatus and method for making density correction in a low resolution image based on edge determination
Cooking device and method of manufacture of the same
Dynamic learning method and adaptive normal behavior profile (NBP) architecture for providing fast protection of enterprise applications
Method for producing cathode active material for a lithium secondary battery
Near-field optical disk having surface plasmon amplification by stimulated emission of radiation
  Randomly Featured Patents
Male chastity apparatus, system, and method
System and method for network optimization
Apparatus and methods for detecting migration of neurostimulation leads
Method and apparatus for causing rapid and deep spatially selective coagulation during thermally mediated therapeutic procedures
Method and system for channel estimation in a single channel (SC) single-input multiple-output (SIMO) system
Toner for electrophotograph and process for the production thereof
Air current regulating nozzle arrangement for ventilating the interior of an automobile
Device for controlling lighting for the interiors of automotive vehicles and method for controlling said device
Piperidine/piperazine derivatives
Diagnostic golf club system