Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Automatic change-over notification for a receiver










Image Number 6 for United States Patent #3944930.

Circuits for use with a receiver which notify the operator of a receiving station by means of an audio tone when an opposite station is calling or has ceased transmission. The transition of an opposite station from its transmitting to receiving state or vice versa is detected and a specific change-over sound based upon the detector output is introduced into the principal station's receiver audio amplifier circuits.








 
 
  Recently Added Patents
Prevention and treatment of osteoarthritis
Differential ring oscillator and method for calibrating the differential ring oscillator
Reducing energy and increasing speed by an instruction substituting subsequent instructions with specific function instruction
Memory device and method for repairing a semiconductor memory
Light-emitting device, film-forming method and manufacturing apparatus thereof, and cleaning method of the manufacturing apparatus
Generator with a segmented stator
Quinoline compounds and their use for treating viral infection
  Randomly Featured Patents
Instrument for laparoscopic procedure
Solid-state imaging apparatus
Incandescent to fluorescent light conversion kit
Soil decontamination system
Embossing tool and embossed product
Thread cut-off mechanism for a sewing machine
Process for producing D-.alpha.-amino acids
Non-corrosive translucent RTV compositions
Anti-dusting formulations
Heteroaromatic derivatives having an inhibitory activity against HIV integrase