Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Transmitter-receiver with automatic alternation control










Image Number 2 for United States Patent #4326293.

Prior to each voice activity period, the transmitter supplies a digital preamble for coding the speech signal levels and during these periods high frequency signals modulated in substantially constant amplitude, but transmits nothing other than said preamble and said periods. On reception, a signal detector and logic elements control a switch to obtain only speech signals at the input of an attenuator. The preamble decoding circuit controls the attenuation value of the attenuator in order to resupply to the receiver output signals of the same relative level as those applied to the transmitter input.








 
 
  Recently Added Patents
Display unit and display method
Nitride semiconductor laser device
Image processing apparatus, control method for the same, and storage medium
Low-staining room temperature curable coating composition
Tiered cost model for access to a computer network
Switch redundancy in systems with dual-star backplanes
Lacrosse head
  Randomly Featured Patents
Binding machine with debinder
Wire feed system for robot welder
Additive for oil-based drilling fluids
Thermosetting concrete-containing epoxy
Probe for combined signals
Input circuit and semiconductor integrated circuit
Scented fragrance warmer
Portable storage apparatus
Three-dimensional shape data recording/display method and device, and three-dimensional shape measuring method and device
Exercise bench