Sustain Checks

[Richard Brekne]

Thanks Michael.

I will give it a looking over

RicB

Michael Chang wrote:
> 
> At 12:02 AM 29/09/03 +0200, you wrote:
> >Just thought I'd mention that I starting a systematic collection of
> >sustain times for 3 notes in every grand piano I run into. I record each
> >pianos A5, A6, and F7 with my portable puter and also note sustain times
> >as my ear interprets them. I have a stop clock and I do 5 checks for
> >each note and take the average. Piano type, serial numbers, and general
> >condition notes are kept as well.
> >
> >The C7 was the definitive looser... with only 5.6 seconds sustain at A6.
> >The Hamburg C had 7.2 and the C3 had 7.7
> 
> Hi Richard,
> 
> A more accurate measurement, especially for the purposes of comparison,
> might be obtained by measuring decay time when final amplitude is 60dB
> below initial attack - similar to RT60 (reverberation time measurement)
> commonly used in acoustics. This way, potential subjective errors can be
> removed.
> 
> There are many software applications that can perform this test using your
> recorded file. My favorite is Spectralab:
> http://www.soundtechnology.com/download-center.htm
> 
> Michael
> Not a piano tech., but interested in the technology.
> 
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-- 
Richard Brekne
RPT, N.P.T.F.
UiB, Bergen, Norway
mailto:rbrekne@broadpark.no
http://home.broadpark.no/~rbrekne/ricmain.html
http://www.hf.uib.no/grieg/personer/cv_RB.html