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-   -   How do you play test tones in the field for impulse response generation? (https://www.dvinfo.net/forum/all-things-audio/107602-how-do-you-play-test-tones-field-impulse-response-generation.html)

Emre Safak November 9th, 2007 07:31 PM

How do you play test tones in the field for impulse response generation?
I am learning about how to create my own impulse responses for convolution reverb. I have the test tones, but I do not know how I would play them in the field. It sounds like so much hassle compared with popping a balloon or firing a toy gun. Does it really sound better? Is the idea in the rising sine-wave method to capture the impulse response at all frequencies? How does it technically differ from the impulse method? Doesn't the sine wave method require silence for the duration of the test tone? What happens, for example, if some noise goes off during the recording/playing of the test tone? Wouldn't that ruin the impulse response?

Gerry Gallegos November 9th, 2007 09:42 PM

convolution samples
Convolution samples "Need" to know what the source is to know how to compare an behave with them. so they have to have a baseline comparison for them to give an accurate example of the sound scape.

Emre Safak November 10th, 2007 01:53 PM

I could not relate what you said to my question.

Emre Safak November 30th, 2007 08:54 AM

I'd like to try one more time!

Does anyone actually use a sweep generator? How much does yours cost and is it portable?

Chris Barcellos November 30th, 2007 11:02 AM


Not sure what you are asking, and I am a novice at the sound side, but used a 1 k tone generated by the audio mixer in a movie I was DP on earlier this year. I since bought a tone generator from BH that plugs into XLR port to set levels. It has several different tones. Don't have any idea if that is what you are after.

Emre Safak November 30th, 2007 11:14 AM

Thanks for responding, Chris. The way it works is that you play a sine wave rising in frequency (a "sweep") and record it. I'm interested in how well it works (since practical environments are unlikely to be quiet for the duration of a sweep). The tone is not of a fixed frequency.

The generators I'm finding on Google are much higher-specced (on the frequency scale), and consequently much-higher priced, than I need.

The alternative is to get a speaker and play a sweep recording. I am concerned that this method will critically depend on the quality of the speakers (since their frequency response will get convolved into the recording). Also I do not know how I would lug around a receiver to power and feed the monitor. It sounds so impractical, that is why I was wondering what people do in practice. Popping a balloon sounds (forgive the pun) so much more convenient.

Chris Barcellos November 30th, 2007 11:19 AM

This is what I got, if it helps anything:


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