Re: Infinite-Precision Dgital Filters


Andor wrote:
Jani Huhtanen wrote:

...
http://ieeexplore.ieee.org/xpls/abs_all.jsp?tp=&arnumber=1205815&isnumber=27140


Heh, funny. They seem to refer to coefficients represented with floating
point numbers as "infinite-precision". From the paper:
"The infinite-precision filter, h(n), is generated by the
raised cosine FIR filter design program provided by the
MATLAB ?firrcos? function.".

As far as I know, Matlab isn't really that good ;)

@Andor:
Pseudo floating-point is their representation for quantized numbers. They
encode a value in two parts: shift (exponent) and span (mantissa).

Now all the need is a sign bit, and they can drop the pseudo prefix.
Guess I gave them too much credit in my first post. Sad.


My first questoin is:

are they refering to infinite precision of the DATA or infinite
precision of the COEFFICIENTS of the filter?

I thought that the correct application of dither gives you infinite
precision of the DATA, at least thats what we have been telling the
audio guys....:-)

It appears the paper is refering to infinte precision of the
coefficients? Correct?

Mark

.

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