Slew rate X telecoms

Audio quality in standard telecom cct's is limited by the CTITT codec,
so I would assume that there is a rule of thumb slew rate for 0dB
signals to get "irrelevant" 2nd harmonic distortion.

So is it possible to have a constant for any signal level? i.e. a
constant you can multiply by pk-pk signal to get the required slew
rate?

I get as far as saying dv/dt=cos(pi)=-1, i.e. theoretically vertical,
how do I translate slew rate limit into THD? And what would be an
acceptable value of THD for telecoms?

I suppose to find the THD for a given slew I would need to integrate
between limits at the point were dv/dt of a sin=slew rate of the
cct......but getting from that concept to the constant I am looking for
is way beyond me ;-)

.

Relevant Pages

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  • Re: X-Meridian opamp replacement
    ... effects when the slew rate limit is well into the ultrasonics. ... What matters is not whether slew rate limiting happens in the audible ... be massive intermod effects on audible signals. ... amplifier was standard practice and was sufficient to stop the amplifier ...
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