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Dual Channel FFT
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<blockquote data-quote="Rob Spence" data-source="post: 56189" data-attributes="member: 80"><p>Re: Dual Channel FFT</p><p></p><p>One other reason to run the stimulus out to the real world is that you may want to measure the transfer function of a part of the audio system and exclude the computer and it's interfaces. For example, if I want a transfer function of the "amp rack" which may include a DSP or crossover or such, then I want to take my reference on the input to the amp rack, and the measurement on the output of the amp rack. Most often I am measuring the "system" which includes the speakers. So, I again want my reference to be after the mixing board so it isn't including things like channel eq or output eq and the measurement is from a mic.</p><p></p><p>If the reference is kept local to the computer then the transfer function includes the I/O of the computer and any thing else in the audio path. Not useful for me at least.</p></blockquote><p></p>
[QUOTE="Rob Spence, post: 56189, member: 80"] Re: Dual Channel FFT One other reason to run the stimulus out to the real world is that you may want to measure the transfer function of a part of the audio system and exclude the computer and it's interfaces. For example, if I want a transfer function of the "amp rack" which may include a DSP or crossover or such, then I want to take my reference on the input to the amp rack, and the measurement on the output of the amp rack. Most often I am measuring the "system" which includes the speakers. So, I again want my reference to be after the mixing board so it isn't including things like channel eq or output eq and the measurement is from a mic. If the reference is kept local to the computer then the transfer function includes the I/O of the computer and any thing else in the audio path. Not useful for me at least. [/QUOTE]
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