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Dual Channel FFT
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<blockquote data-quote="Peter Morris" data-source="post: 56162" data-attributes="member: 652"><p>Re: Dual Channel FFT</p><p></p><p></p><p></p><p>Hi Mark,</p><p></p><p>Perhaps Im missing something, but my understanding is as follows:</p><p></p><p>A single channel FFT does not in general measure a transfer function.</p><p></p><p>However, a single channel FFT using a pink noise source as the reference will more or less enable you to measure/calculate the transfer function.</p><p></p><p>A dual channel FFT will work with music but performs better with pink noise. As I mentioned above you can do this as you mix. This can assist you to know where to make your EQ corrections - on the system EQ or the channel strip.</p><p></p><p>The input and output samples of a dual channel FFT must be accurately time aligned (the time delay in Smaart). It requires many samples to be averaged. The resulting transfer function will exclude most of the random and reverberant noise in the measurement environment; this is the advantage over a single channel FFT or RTA measurement using pink noise.</p><p></p><p>I’m not sure if what you are proposing is a dual channel FFT where one channel comes internally from the computer or if you are proposing to use a single channel FFT where you correct for the shape of the original signal (?).</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 56162, member: 652"] Re: Dual Channel FFT Hi Mark, Perhaps Im missing something, but my understanding is as follows: A single channel FFT does not in general measure a transfer function. However, a single channel FFT using a pink noise source as the reference will more or less enable you to measure/calculate the transfer function. A dual channel FFT will work with music but performs better with pink noise. As I mentioned above you can do this as you mix. This can assist you to know where to make your EQ corrections - on the system EQ or the channel strip. The input and output samples of a dual channel FFT must be accurately time aligned (the time delay in Smaart). It requires many samples to be averaged. The resulting transfer function will exclude most of the random and reverberant noise in the measurement environment; this is the advantage over a single channel FFT or RTA measurement using pink noise. I’m not sure if what you are proposing is a dual channel FFT where one channel comes internally from the computer or if you are proposing to use a single channel FFT where you correct for the shape of the original signal (?). [/QUOTE]
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