Adaptive multitone signaling method
AssigneeBell Communications Research, Inc.
InventorStanley Pietrowicz
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Abstract
An 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).
Claims10
An inband tone signaling method for use in a telephone network comprising the steps of
- at a transmitter, monitoring the power in one or more guard frequency bands comprising one or more portions of a voiceband signal,
- generating at said transmitter a tone signal comprising of one or more frequencies with individual power levels selected in response to the power in a selected one or more of said guard frequency bands, and
- transmitting the tone signal to a detector.
An inband tone signaling method comprising the steps of
- receiving a voiceband signal at a central office switch of a telephone network,
- monitoring the power level in one or more guard bands of said voiceband signal,
- generating an inband tone signal whose tone power levels are dependent on the power level in a selected one or more of said guard bands,
- transmitting said inband tone signal from said central office switch to a unit of customer premises equipment, and
- detecting said inband tone signal at a detector located at said customer premises equipment.
A transmitter for use in a telephone network for generating an inband tone signal comprising
- a frequency selective signal power monitor for monitoring the power in one or more guard bands of a voiceband signal, and
- a tone signal generator for generating said inband tone signal with each individual tone power level determined in response to the power in a corresponding said one or more of said guard bands.
Dependencies are inferred from the claim text.