Multi signal processor systems for acoustical echo control

Two multi-digital-signal-processor systems for high-speed signal processing are presented. Both systems can be configured with a variable number of processor units. Thus, there is sufficient computational power for real-time implementations of high-order adaptive filter algorithms as required for echo cancellation, e.g. in hands-free telephone equipment. One system is based on the DSP32 floating-point DSP (digital signal processor) from AT&T. Monitoring and debugging is done with a standard PC system. The second system uses Fujitsu´s MB8764 fixed-point DSP. It is controlled by an 80186 AMS-M-Bus microcomputer board. The architectures are designed to support efficient parallel implementations of high-order adaptive algorithms and of multirate systems for echo compensation in frequency subbands (i.e. block processing)