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speex_echo.h

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00001 /* Copyright (C) Jean-Marc Valin
00002 
00003    File: speex_echo.h
00004 
00005 
00006    Redistribution and use in source and binary forms, with or without
00007    modification, are permitted provided that the following conditions are
00008    met:
00009 
00010    1. Redistributions of source code must retain the above copyright notice,
00011    this list of conditions and the following disclaimer.
00012 
00013    2. Redistributions in binary form must reproduce the above copyright
00014    notice, this list of conditions and the following disclaimer in the
00015    documentation and/or other materials provided with the distribution.
00016 
00017    3. The name of the author may not be used to endorse or promote products
00018    derived from this software without specific prior written permission.
00019 
00020    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
00021    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00022    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00023    DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
00024    INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
00025    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
00026    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00027    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
00028    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
00029    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00030    POSSIBILITY OF SUCH DAMAGE.
00031 */
00032 
00033 struct drft_lookup;
00034 
00035 typedef struct SpeexEchoState {
00036    int frame_size;           
00037    int window_size;
00038    int M;
00039    int cancel_count;
00040    float adapt_rate;
00041 
00042    float *x;
00043    float *X;
00044    float *d;
00045    float *D;
00046    float *y;
00047    float *Y;
00048    float *E;
00049    float *PHI;
00050    float *W;
00051    float *power;
00052    float *power_1;
00053    float *grad;
00054    float *old_grad;
00055 
00056    struct drft_lookup *fft_lookup;
00057 
00058 
00059 } SpeexEchoState;
00060 
00061 
00063 SpeexEchoState *speex_echo_state_init(int frame_size, int filter_length);
00064 
00066 void speex_echo_state_destroy(SpeexEchoState *st);
00067 
00069 void speex_echo_cancel(SpeexEchoState *st, float *ref, float *echo, float *out, float *Y);
00070 

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