DIAL PULSE DETECTION

摘要

DIAL PULSE DETECTION A dial pulse detection system is disclosed which has an analogue input buffer, an analogue to digital converter (ADC), a processor and an output buffer. The processor operates on the digitally encoded samples produced by the ADC 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 the output buffer. The processor includes a facility for sending an error signal to the user to indicate that dialled digits have not been correctly received.