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KWS open division: clarification on LFBE pre-processing parameters

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Read the KWS open-division rules and the linked reference lines for the MFCC and LFBE options; the issue does not name specific files or tests. Confirm the canonical LFBE input shape, mel range, and whether raw-audio on-device feature extraction counts toward latency and energy, then provide a pointer to the authoritative file or commit.

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描述

Hi,

The rules allow three pre-processing options for KWS in the open division. I'd like to confirm the intended LFBE settings:

  1. Input shape: Is the LFBE feature map meant to be 40×41 or 40×49? I.e., does LFBE use the same window/stride as the MFCC reference (30 ms / 20 ms), or different values? [link to relevant lines]

  2. Mel range: MFCC appears to use ~20 Hz–4 kHz, while LFBE uses 0 Hz–8 kHz [link]. Is this intentional, or should LFBE match the MFCC range? A 0 Hz lower edge is unusual for speech, so I wanted to check it isn't a library default.

  3. td_samples: For the raw-audio option, is any on-device feature extraction considered part of the model, and therefore included in measured latency and energy?

A pointer to the canonical values (file/commit) would be great. Thanks!

Simeon

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