26 lines
467 B
C
26 lines
467 B
C
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// Copyright (c) 2016 HR
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#ifndef FRONTEND_FFT_H_
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#define FRONTEND_FFT_H_
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#ifndef M_PI
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#define M_PI 3.1415926535897932384626433832795
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#endif
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#ifndef M_2PI
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#define M_2PI 6.283185307179586476925286766559005
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#endif
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namespace wenet {
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// Fast Fourier Transform
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void make_sintbl(int n, float* sintbl);
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void make_bitrev(int n, int* bitrev);
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int fft(const int* bitrev, const float* sintbl, float* x, float* y, int n);
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} // namespace wenet
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#endif // FRONTEND_FFT_H_
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