interfacing circuit of the pre - and post - treatment of audio signals before or after embodiment of the software processing by a processor

摘要

This circuit (36) makes it possible to convert them of the signals high bit rate, digitized at a high sampling frequency corresponding to a reproduction of musical quality, and signals low flow rate, digitized at a sampling frequency is low, corresponding to a reproduction of the voice quality and adapted to the execution of the software processing by the processor. The circuit, produced in hardware, comprises a coupling (50) to a bus (34) for connection to the processor, and the circuits for converting the input and output. The conversion circuits comprise of the sample memories forming the input buffer (54) and (62), as well as the circuits under - sampling (56) and on - sampling (66). A control circuit (60, 70) coordinates the management of the input and output buffer and the sequencing of the under - sampling and on - sampling, and the reception and the delivery of the input and output signals in.