Re: Sound from scratch
Re: Sound from scratch
- Subject: Re: Sound from scratch
- From: Marcelo Cicconet <email@hidden>
- Date: Mon, 9 Feb 2009 16:37:08 -0200
My contribution to the conversation is by recommending reading Puckett's book:
http://crca.ucsd.edu/~msp/techniques/latest/book.pdf
Regards,
Marcelo C.
On Mon, Feb 9, 2009 at 1:51 PM, Jens Alfke <email@hidden> wrote:
>
> On Feb 8, 2009, at 8:21 PM, Ron Olson wrote:
>
>> I'm not sure where to begin with this one, but I want to create some
>> music purely through code; no use of devices or instruments or
>> anything. That said, I don't want to to come out sounding like beeps
>> or bloops; I'd rather like to be able to play around with generating
>> sound like I can do with graphics programming.
>
> Audio synthesis seems (to my eyes) to be kind of a black art, much harder
> than manipulating existing sound. The ones who practice it are the
> synthesizer designers, and a lot of the things they do are considered trade
> secrets, so they're not published. (Even back in the '70s heyday of analog
> synths, the circuitry was more complex than you'd expect: if you took a
> scope to the supposedly sawtooth-wave oscillator, what you saw wouldn't look
> like a pure sawtooth at all, but one that had been heavily tweaked to sound
> better.)
>
> It's all math, of course, and DSP techniques to make it run fast. The
> CoreAudio part is easy — you just write a function to copy your output
> samples into a buffer and hook your function up to the input of an
> AudioUnit.
>
> Things to read up on:
> - Fourier transforms and the FFT algorithm, so you can do stuff in the
> frequency domain, like filtering (thankfully, this is implemented in the OS)
> - Subtractive synthesis (what analog synths use -- oscillators and filters)
> - FM synthesis (this is the most common technique in digital synths, such as
> the ubiquitous '80s Yamaha DX-7)
> - Analog circuit simulation (how softsynths emulate analog synths, a la
> Rebirth.)
>
> My knowledge of this is only inch-deep, so apologies if I'm spouting
> nonsense :)
>
> —Jens
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--
www.marcelocnt.com
www.impa.br/~cicconet
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