Digital tone generator
Series ringing signal generator
Spontaneous caller identification with call-waiting Patent #: 5263084
ApplicationNo. 987518 filed on 12/08/1992
US Classes:379/257, For calling station (e.g., status or progress tones)379/351, Signalling integrity protection (e.g., voice signal immunity)379/361, Electronic (e.g., tone generator)379/418CALL SIGNAL GENERATING (E.G., RINGING OR TONE GENERATOR)
ExaminersPrimary: Dwyer, James L.
Assistant: Hunter, Daniel S.
Attorney, Agent or Firm
International ClassH04M 003/18
AbstractAn inband tone signaling method results in improvements in talk-off and talk-down performance without sacrificing important human factors considerations. The inband tone signal transmitter has a monitor (60) for monitoring the power level in one or more guard bands (1 and 2) of a voiceband signal. A tone generator (64) which is responsive to the monitor (60) generates the inband tone signal consisting of one or more signaling frequencies each at a level such that a desired signal-to-guard ratio is achieved at a detector (50).