Bandpass

[Jiahn K]

Hello,
I don’t quite understand how the bandpass has to do with speech recognition. The bandpass goes through several rectangular boxes, but it has a single magnitude value. Umm are you just assuming an artificial sound with a series of frequencies but uniform magnitude here?

Thanks!

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[Simon]

The bank of filters is one stage in extracting useful features from a frame of speech waveform. The diagram you show is a simple bank of rectangular filters, which would work, but in practice we typically use triangular overlapping filters.

The energy in each band is one feature. It is the total amount of energy in that frequency band, for that frame of speech. The number of filters determines how many features we extract (typically 20-30).

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