On Thu, 2010-04-29 at 16:15 +0200, tim vets wrote:

there's a very simple way do do 'sample rate reduction' (which is i think the sound you're looking for) [readsf~] | [phasor~ 100] | / [samphold~] | instant lo-fi gratification :)

This is a crude way to reduce sample rate, but not quite so to reduce bit depth.

I say crude, because if the frequency of the phasor~ is not a dividable whole number of the sampling rate, it will additionally add some jitter (which even enhances the lofi effect).

Reduced bit depth (which is what I think 'bit-crushing' means) can be achieved by dividing the signal by x, pass it through something like [int~], multiply it by x again. An [int~] can be implemented by using [wrap~] and [-~], which are both vanilla.

Roman

2010/4/29 Pierre Massat pimassat@gmail.com Same here! Only i want to use it, too.

    Pierre

    2010/4/29 David Schaffer <schafferdavid@hotmail.com>

            Hi everybody, 

                   I'd like to know if there's a bit crusher/
            lo-fi/ sonic destructor abs. somewhere out there. I'd
            like to take a look inside to see how it works, just
            out of curiosity.

            Thanks 

            D.S

            http://www.flickr.com/photos/schafferdavid/

            http://audioblog.arteradio.com/David_Schaffer/






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On Thu, 29 Apr 2010, Roman Haefeli wrote:

Reduced bit depth (which is what I think 'bit-crushing' means) can be achieved by dividing the signal by x, pass it through something like [int~], multiply it by x again. An [int~] can be implemented by using [wrap~] and [-~], which are both vanilla.

It is also worth considering adding a DC offset. Your [wrap~] solution implements a floor-function, that is, rounding downwards. You can make it round to closest, by adding x/2 before rounding downwards.

[expr int($v1)] is rounding zerowards (thus output zero corresponds to a twice bigger input range as any other input). Thus it will behave in a weird unequal way.

When the volume gets low, the _effective_ bits-per-sample gets very low, because the relative precision of integers is proportional to amplitude (which is not the case with floats). Therefore, even with 16-bit audio, if your amplitude is 0.0001 times the max, it will feel as if it were 3-bit audio. In such circumstances, the differences between the possible roundings will become quite audible.

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