Resources Contact Us Home
Automatic gain control using root-mean-square circuitry in a digital domain conference bridge for a telephone network

Image Number 6 for United States Patent #5029162.

An automatic gain control for an inputted multiplex PCM data stream in a conferencing bridge in a telephone system. The inputted multiplexed data stream has a predetermined number of time slots wherein each time slot carries PCM speech data corresponding to an individual party in the conference call. The control of the present invention is capable of operating in .mu.-Law or A-Law companded format at a frequency of 192-256 kilobytes per second. The automatic gain control incorporates a digital root-mean-square meter, a COUNT sequence to change GAIN at predetermined intervals, and a set of GAIN rules to selectively increase or decrease GAIN based upon the output of the digital root-mean-square meter.

  Recently Added Patents
Mask blank, transfer mask, and film denseness evaluation method
Process cartridge and electrophotographic image forming apparatus
Storage system comprising multiple microprocessors and method for sharing processing in this storage system
Multistable electromagnetic actuators
Systems and methods for automobile accident claims initiation
Apparatus and methods for providing efficient space-time structures for preambles, pilots and data for multi-input, multi-output communications systems
Tailoring the band gap of solar cells made of liquid silane by adding germanium
  Randomly Featured Patents
Rotary fluid coupling
Devices for rapid temperature detection
Lightly branched higher olefin oligomerization with surface modified zeolite catalyst
Actuating downhole devices in a wellbore
Low profile socket connector
Apparatus for removing a mixture of blasting media and cleaning residues from workpieces treated with blasting media
Orthotopic total artificial heart
Safety device for steel bed rail
Sheet depositing device
Memory card audio player with a radio tuner