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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Time Domain measurements posted by theaudiohobby on September 18, 2004 at 18:49:00:
Frequency response is measured in the frequency domain. However, by observing the response to square waves, you can compute the frequency response. However, generally you have to sample them at two or more frequencies. Low frequency falloff is indicated by a tilt from the leading to lagging edge. The more severe the tilt, the greater the falloff. Typically 100 hz is used. For the high end, the rise time is indicitave of the falloff. The rounder the leading edge, the greater the falloff. often 10 khz is used. A frequency response peak is indicated by ringing which is several cycles of oscillation superimposed on the square wave. Complete reports of amplifiers and preamplifiers should include square wave photos. So should complete reports of phonograph cartridges. Loudspeakers rarely will show square wave response because the results are usually awful and not necessarily indicitive of how they will sound. A tone burst test which is several cycles at a particular frequency with intervening segments of zero volatge are sometimes used to indicate transient response of loudspeakers.
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Follow Ups
- Re: Time Domain measurements - Soundmind 20:26:27 09/18/04 (0)
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