maximum clock frequency
Posted: Thu Oct 18, 2012 1:39 am
What is the maximum safe clock frequency (quartz) on which the FV-1 can operate safely?
The reason for this question is the following:
We are programming acoustical octave- and third-octave filters up to 8 kHz on the FV-1. These filters require cascading of three biquad sections in order to get the frequency response according to international standards. As the number of commands is limited to 128, only 2-times oversampling is possible in the filter sections. While the filters up to 2 kHz are perfect, especially the 8-kHz filters show significant deviations due to to the fact that the frequency coefficient (together with the required hi Q-values) comes close to the critical value of 1. A higher clock frequency than the 40 kHz used now would of course give better results.
The reason for this question is the following:
We are programming acoustical octave- and third-octave filters up to 8 kHz on the FV-1. These filters require cascading of three biquad sections in order to get the frequency response according to international standards. As the number of commands is limited to 128, only 2-times oversampling is possible in the filter sections. While the filters up to 2 kHz are perfect, especially the 8-kHz filters show significant deviations due to to the fact that the frequency coefficient (together with the required hi Q-values) comes close to the critical value of 1. A higher clock frequency than the 40 kHz used now would of course give better results.