I note that CML http://www.cmlmicro.co.uk are producing a full duplex CVSD Codec part number CMX639 there is also the FX619 intended for Military Comms Woops the alarm bell have just gone off at Menwith Hill :-) Regards Chris ----- Original Message ----- From: "Bob Ammerman" To: Sent: Sunday, November 12, 2000 1:00 AM Subject: Re: [EE]:Syllabic Integrator > Hey, I've got the same problem. A system that contains a CVSD chip that has > been obsoleted. > I'm wondering if it is possible to do CVSD in firmware on a PIC. > > Does anybody know of a software implementation of CVSD on any platform > whatsoever for which I can obtain the source code? > > Or a detailed description of the algorithm? > > Bob Ammerman > RAm Systems > (contract development of high performance, high function, low-level > software) > > ----- Original Message ----- > From: Jinx > To: > Sent: Saturday, November 11, 2000 7:47 PM > Subject: [EE]:Syllabic Integrator > > > > Can someone please explain estimate and syllabic integrators. I've > > looked around and keep coming up with the same three very similar > > web pages eg > > > > http://www.users.zetnet.co.uk/ross/radio/iaru-4.htm > > > > I'd like to replace a DSP chip that performs CVSD (Continuously > > Variable Slope Delta) functions for converting waves to SRAM data. > > The block diagram of the chip's input section shows the 10-bit ADC, > > comparator, estimate integrator, and syllabic integrator. The output > > is an adder + 10-bit DAC > > > > The chip produces a stream of 1-bit differences between samples > > on audio range frequencies at 64k samples/sec. Is it possible to do > > this in s/w (with external ADC/DAC) ? I like what the chip does and > > would want to keep the same specs > > > > -- > > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > > use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST > > > > > > > > > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST > > > > > -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu