Re: Structured Programming using Forth

rickman wrote:
It is very seldom that I understand where you get your information.

In this case, from the Intellasys web site. Regarding home theatre systems, well, that's one of the industries my company targets, and I've got plenty of experience in that field.

> I really don't understand you.

Then it's best to avoid me. Do you need assistance in figuring out how not to read my messages?

> I point out that the home theater
application requires more than 18 bits and your response is that I
might be confusing the width of the DAC with the size of the
calculation. I clearly said the chip would need to be at least 24
bits which is what is commonly used for high end audio.

Yes, and that's why I wrote that you seem to be confusing the width of the A/D with the width that is needed. Yes, the dominate bit-width of digital audio these days is 24 bits. But that is only the width used by the A/D and D/A converters. Even the most basic digital audio system will require more bits in the intermediate calculations used in home theatre systems.

> I don't see
where you say how many bits the SeaForth chip has and yet you somehow
come to the conclusion that it "must" be using multi-precision.

Everything I find on the Intellasys web site and elsewhere suggests that the SEAforth machine is an 18-bit machine. The instruction set summary that I see described doesn't have a multiply, but does have a multiply step that is used to synthesize a multiply. So, when discussing how the SEAforth chip will fare against DSPs, I can make the following intelligent guesses:

1. Since the processor is likely an 18-bit machine, we're going to need multi-precision math in order to do the various calculations used in modern digital audio systems.

2. Since the processor doesn't have a hardware multiply but does have a multiply step (called "+*"), it's reasonable to assume that MAC operations will be synthesized from more primitive operations.

> How
many bits is the SeaForth chip MAC?

The answer is zero, since the SEAforth chips don't have a MAC. It must be synthesized from more primitive operations.

> I seem to recall that Chuck is
rather fond of 20 bit words which might well suffice in a digital
audio app depending on the processing done. But my point is that your
post does not explain anything, it just jumps to several conclusions.

Perhaps you are having the same problem I had. Others would discuss information on the Intellasys web site and I would be unable to find it. It wasn't until I registered with them did I find that logging in to their site provided me with substantially more information than is available to the public.

I get tired of trying to communicate with you. I don't know where you
are coming from and your posts are not really responsive to what I
say.

Then please ignore me. You obviously aren't getting any benefit from conversing with me and I can assure you the opposite is also true.
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