ODP: DSP Stuff: floating point or fixed point

[Roman Sowa]

> -----Oryginalna wiadomość-----
> Od:	Ben Stuyts [SMTP:ben at stuyts.nl]
> Wysłano:	8 stycznia 1999 00:38
> Do:	Michael Maloney
> DW:	synth-diy at mailhost.bpa.nl
> Temat:	Re: DSP Stuff: floating point or fixed point
> 
> I happened to read a couple of messages on comp.dsp about how a fixed
> point  
> DSP might be actually preferable over a floating point DSP. Here are some
> 
> quotes:
> ...
> > For operations such as FIR filtering, a fixed-point part has
> > GREATER precision (i.e., LESS noise) than a floating-point
> > device. This is because all fixed-point processors (that I've
> > ever seen, at least) that operate on N-bit data provide at
> > least a 2N-bit accumulator. For example, even a lowly 16-bit
> > fixed-point device such as the TI TMS320C50 has a 32-bit
> > accumulator. Thus one can carry forward 32 bits of precision
> > in the sum involved in the filter convolution, and if
> > noise-shaping is used, one can preserve much of that precision
> > when converting back to 16-bit values.
	[Roman Sowa]  
	Say, what?...
	Not satisfied with IEEE floating point format? Why not use
	40-bit floats in SHARC. And you can also use it as 32-bit
	fixed poit DSP

	Roman
>  
>