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US 4,924,501 AGranted
Dial pulse selection
AssigneeBritish Telecommunications plc
InventorsDavid S. Cheeseman, Arthur J. Wright
Life of this patent
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AssigneeBritish Telecommunications plc
InventorsDavid S. Cheeseman, Arthur J. Wright
Estimating the term…
A dial pulse detection system 20 has an analogue input buffer 22, an analogue to digital converter (ADC) 24, a processor 25, and an output buffer 26. Processor 25 operates on the digitally encoded samples produced by ADC 24 from the received signal to achieve detection of the dial pulse signalling data in the received signal. This detection process involves a training process and a recognition process. The training process extracts amplitude and timing characteristics of a first part of the received signal from a dialling instrument. These characteristics are then used to form a template for recognition of subsequent dialled digits. Detected digits are then made available at output buffer 26. Processor 25 includes a facility for sending an error signal to the user to indicate that dialled digits have not been correctly received.
A method of detecting dial pulse signalling data in a received signal comprising the steps of:
A method of detecting dial pulse signalling data in a received signal comprising the steps of:
A detector for dial pulse signalling data comprising:
Interactive terminal equipment comprising a detector for detecting dialled digits comprising means for processing a received signal including training means and recognition means, said training means comprising means for processing a signal known to be a dialled signal to extract timing information relating to the dialled pulses in a dialled digit in said dialled signal, said recognition means including means for using said timing information to assist in detecting dial pulse signalling data in dialled digits, and including means to transmit messages to a user inviting the user to dial digits according to the user's requirements and to provide a service to the user dependent on the digits dialled.
Dependencies are inferred from the claim text.