spandsp: spandsp (low-level signal processing library) spandsp: spandsp: SpanDSP is a library of DSP functions for telephony, in the 8000 spandsp: sample per second world of E1s, T1s, and higher order PCM channels. spandsp: It contains low level functions, such as basic filters. It also spandsp: contains higher level functions, such as cadenced supervisory tone spandsp: detection, and a complete software FAX machine. spandsp: spandsp: spandsp: spandsp: