algorithm of Inverse discrete wavelet transform

I don't have the book on me right now, but I'm pretty sure Vaidyanathan
uses the term "expanding" as well. "Upsampling", I think, was the term
introduced by digital audio companies that successfully managed to
obfuscate the term with "oversampling" -- at least for people
unfamiliar with the terms (see
http://www.thetadigital.com/upsampling.htm). The way I see it, the
signal has not been "upsampled" until it's been passed through a LPF
that interpolates the sequence...

Ravi Srikantiah wrote:
> The way I see it, the
> signal has not been "upsampled" until it's been passed through a LPF
> that interpolates the sequence...

In Discrete Time Signal Processing, Oppenheim uses the term "upsampling" to
mean the operation of increasing the sampling rate. The system which
performs the upsampling is refered to as "expander" or "sampling rate
expander". When LPF is added after the expander then the whole system is
refered to as "interpolator". It is also mentioned that upsampling and
interpolation are synonymous. 

So it seems that Oppenheim and you use the same terminology. I have always
though that upsampling is done by the expander and interpolation is done by
the interpolator (i.e. expander + LPF). I guess I was wrong because
expander just increases the sample rate, but not the sampling rate.

-- 
Jani Huhtanen
Tampere University of Technology, Pori