add demo.py for all kws models (#2107)

sugarcase

2024-09-25 8cd8e25f180b57c74f1ae7fd39001e5af4c20f8b

 funasr/frontends/wav_frontend.py

@@ -134,7 +134,7 @@
            mat = kaldi.fbank(
                waveform,
                num_mel_bins=self.n_mels,
                frame_length=self.frame_length,
                frame_length=min(self.frame_length,waveform_length/self.fs*1000),
                frame_shift=self.frame_shift,
                dither=self.dither,
                energy_floor=0.0,