Patent ID: 6052409
Filing Date: 2000-04-18
Classification: H04Q

Abstract:
In a digital communication device having an analog port adapted for interconnecting an analog device to the digital communication device, a device for generating and detecting tones, comprising:a processor programmed to selectively generate one of a first set of digital tones in a generation mode and to detect one of a second set of digital tones in a detection mode;a conversion circuit, operably coupled to the processor, adapted to convert the one of the first set of digital tones generated by the processor in the generation mode to an analog tone and transmit the analog tone to the analog device; the conversion circuit further being adapted to convert an analog tone received from the analog device to the one of the second set of digital tones and transmit the digital tone to the processor when the processor is in the detection mode; andan interface circuit, operably coupled to the processor and the conversion circuit, which couples the one of the first set of digital tones generated by the processor in the generation mode to the conversion circuit and the one of the second set of digital tones to the processor when the processor is in the detection mode.