Type : Bit-reducer and sample&hold unit
References : Posted by tobyear[AT]web[DOT]de
This is a simple bit and sample rate reduction code, maybe some of you can use it. The parameters are bits (1..32) and rate (0..1, 1 is the original samplerate).
Call the function like this:
A VST plugin implementing this algorithm (with full Delphi source code included) can be downloaded from here:
Comments/suggestions/improvements are welcome, send them to: firstname.lastname@example.org
// bits: 1..32
// rate: 0..1 (1 is original samplerate)
********** Pascal source **********
// call this at least once before calling
// decimate() the first time
m:=1 shl (bits-1);
if (cnt>1) then
********** C source **********
long int m=1<<(bits-1);
float decimate(float i)
from : kaleja[AT]estarcion[DOT]com
comment : Nothing wrong with that, but you can also do fractional-bit-depth decimations, allowing
smooth degradation from high bit depth to
low and back:
// something like this -- this is
// completely off the top of my head
// precalculate the quantization level
float bits; // effective bit depth
float quantum = powf( 2.0f, bits );
// per sample
y = floorf( x * quantum ) / quantum;
from : dr[DOT]kef[AT]spray[DOT]se
comment : it looks to me like the c-line
long int m=1<<(bits-1);
doesnt give the correct number of quantisation levels if the number of levels is defined as 2^bits. if bits=2 for instance, the above code line returns a bit pattern of 10 (3) and not 11 (2^2) like one would expect.
please, do correct me if im wrong.
from : resofactor[AT]hotmail[DOT]com
comment : just getting into coding, i've mainly been working with synthedit...but would really like to move on into the bigger arena? any pointers for a DSP newbie-totally not hip on structured programming...yet! :O)
from : gary[at]dmt uk
comment : great algo, works fine.. many thanks
from : catena[AT]neostrada[DOT]pl
comment : Hey, kilelr job on that one you guys!
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