A Sound Engineers Guide to Audio Test and Measurement by Glen Ballou

By Glen Ballou

I'll qualify that i have not learn the publication but. simply glancing via it after it arrived used to be disappointing. The ebook has 3 sections. part one is "Test and size" by means of Pat Brown, and is forty eight pages lengthy. It feels like a great evaluate of checking out, very like he bargains within the SynAudCon classes.
Section is "What's the Ear for? how one can defend it". it's 25 pages lengthy and whereas it appears to be like legitimate, wasn't what I anticipated during this name. part 3 is basics and devices of size. it's approximately a hundred pages of charts masking every thing shape the SI process (wow i did not recognize octillion is the identify of a bunch, that makes my lifestyles richer), to a couple uncomplicated one paragraph subject matters on easy physics, a few reliable formulation and charts for audio utilization, directly to the greek alphabet, ISO common numbers, abbreviations for 30 pages (XLPE is move associated polyethelene), to a few geometry reveiw. it's authentic filler.

It seems the content material is nice, yet easy. It was once now not a close ebook on a legitimate Engineers advisor to Audio attempt and dimension for my part. There are different books that conceal this larger. in reality this publication seems to be 3 chapters out of instruction manual for Sound Engineers. i did not search for updates. It seems to be approximately identical.

My score is low simply because it is a rehash of a component one other booklet and the content material doesn't keep on with the name rather well.

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Extra info for A Sound Engineers Guide to Audio Test and Measurement

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If one is diagnosing loudspeaker ailments, there is little reason to select a time window long enough to include the effects of late reflections and reverberation. A properly selected time window can isolate the direct field of the loudspeaker and allow its response to be evaluated independently of the room. If one is trying to measure the total decay time of the room, the direct sound field becomes less important, and a microphone placement and time window are selected to capture the entire energy decay.

This may be essential to determine whether the individual components are working properly, or if an anomaly is the result of interaction between several components. “Divide and conquer” is the axiom. 3. Select the microphone position. I usually begin by looking at the on-axis response of the loudspeaker as measured from inside of critical distance. If multiple loudspeakers are on, turn all but one of them off prior to measuring. The microphone should be placed in the far free field of the loudspeaker as previously described.

Large radiators (or groups of radiators) emitting high frequencies can extend the near field to very long distances. Line arrays make use of this principle to overcome the inverse-square law. In practice, small bookshelf loudspeakers can be accurately measured at a few meters. About 10 m is a common measurement distance for moderate-sized, full-range loudspeakers in a large space. Even greater distances are required for large devices radiating high frequencies. A general guideline is to not put the mic closer than three times the loudspeaker’s longest dimension.

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