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Re: Sound head of the 'Moviola'

There is no need for "quantization".
Frequency and phase are the Fourier Transform (which is a linear, energy-preserving transform) of Amplitude in the time domain.
The Fourier Transform is really a complex, but it often gets converted to polar. More convenient sometimes, less so sometimes.

From: AUDITORY - Research in Auditory Perception [AUDITORY@xxxxxxxxxxxxxxx] On Behalf Of Kevin Austin [kevin.austin@xxxxxxxxxxxx]
Sent: Wednesday, December 29, 2010 1:29 PM
To: AUDITORY@xxxxxxxxxxxxxxx
Subject: Re: [AUDITORY] Sound head of the 'Moviola'

In the time domain, as Hugh Le Caine used to say, everything is amplitude (displacement). As I understand this, frequency and phase are derived from amplitude in [quantized] time.


On 2010, Dec 29, at 2:47 AM, ita katz wrote:

But the amplitude does not carry all the information needed to recreate the sound. Similarly, the "Sound-on-Film" entry states:

stereo variable-area (SVA) recording, encoding a two-channel audio signal as a pair of lines running parallel with the film's direction of travel through the projector. The lines change area (grow broader or narrower) depending on the magnitude of the signal.

Again, what encodes the frequency/phase?

Thank you


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