search for: recoreded

Hi: Suppose that I have a data frame as below x1 x2 x3 ... x10 wk1 wk2 ... Wk208 (these are the column names) For each record, x1, x2, x3 ... x10 are attributes. and wk1, wk2, ..., wk208 are the sales recoreded for this attribute combination. Suppose that now, that I want to do the following 1. Merge the data frame so that I have a new data frame grouped by values of x2 and x3 (for example). That is, if two records have the same values of x2 and x3, they should be summed. I tried to look at merge, tappl...

Hi All, In order to deal with acoustic echo cancellation problems of most PCs which sound cards have different capture and play frequencies. I made a trial. At first, a 1000Hz sine wave is played for a long time via a speaker and its acoustic echo is recoreded. Seconds, get the frequency of the echo by a FFT analyser. So the difference between capture and play frequencies is obtained. Thirdly, before AEC, the signal captured by the soundcard is resampled to the play frequency. The frequency step of the resampler is 0.1Hz. So for the AEC, the difference b...

...t; In order to deal with acoustic echo cancellation problems of most PCs >> which >> sound cards have different capture and play frequencies. I made a trial. >> >> At first, a 1000Hz sine wave is played for a long time via a speaker >> and its >> acoustic echo is recoreded. >> >> Seconds, get the frequency of the echo by a FFT analyser. So the >> difference >> between capture and play frequencies is obtained. >> >> Thirdly, before AEC, the signal captured by the soundcard is resampled >> to the >> play frequency. The fr...

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