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1 /*
2  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AECM_AECM_DEFINES_H_
12 #define WEBRTC_MODULES_AUDIO_PROCESSING_AECM_AECM_DEFINES_H_
13 
14 #define AECM_DYNAMIC_Q                 /* Turn on/off dynamic Q-domain. */
15 
16 /* Algorithm parameters */
17 #define FRAME_LEN       80             /* Total frame length, 10 ms. */
18 
19 #define PART_LEN        64             /* Length of partition. */
20 #define PART_LEN_SHIFT  7              /* Length of (PART_LEN * 2) in base 2. */
21 
22 #define PART_LEN1       (PART_LEN + 1)  /* Unique fft coefficients. */
23 #define PART_LEN2       (PART_LEN << 1) /* Length of partition * 2. */
24 #define PART_LEN4       (PART_LEN << 2) /* Length of partition * 4. */
25 #define FAR_BUF_LEN     PART_LEN4       /* Length of buffers. */
26 #define MAX_DELAY       100
27 
28 /* Counter parameters */
29 #define CONV_LEN        512          /* Convergence length used at startup. */
30 #define CONV_LEN2       (CONV_LEN << 1) /* Used at startup. */
31 
32 /* Energy parameters */
33 #define MAX_BUF_LEN     64           /* History length of energy signals. */
34 #define FAR_ENERGY_MIN  1025         /* Lowest Far energy level: At least 2 */
35                                      /* in energy. */
36 #define FAR_ENERGY_DIFF 929          /* Allowed difference between max */
37                                      /* and min. */
38 #define ENERGY_DEV_OFFSET       0    /* The energy error offset in Q8. */
39 #define ENERGY_DEV_TOL  400          /* The energy estimation tolerance (Q8). */
40 #define FAR_ENERGY_VAD_REGION   230  /* Far VAD tolerance region. */
41 
42 /* Stepsize parameters */
43 #define MU_MIN          10          /* Min stepsize 2^-MU_MIN (far end energy */
44                                     /* dependent). */
45 #define MU_MAX          1           /* Max stepsize 2^-MU_MAX (far end energy */
46                                     /* dependent). */
47 #define MU_DIFF         9           /* MU_MIN - MU_MAX */
48 
49 /* Channel parameters */
50 #define MIN_MSE_COUNT   20 /* Min number of consecutive blocks with enough */
51                            /* far end energy to compare channel estimates. */
52 #define MIN_MSE_DIFF    29 /* The ratio between adapted and stored channel to */
53                            /* accept a new storage (0.8 in Q-MSE_RESOLUTION). */
54 #define MSE_RESOLUTION  5           /* MSE parameter resolution. */
55 #define RESOLUTION_CHANNEL16    12  /* W16 Channel in Q-RESOLUTION_CHANNEL16. */
56 #define RESOLUTION_CHANNEL32    28  /* W32 Channel in Q-RESOLUTION_CHANNEL. */
57 #define CHANNEL_VAD     16          /* Minimum energy in frequency band */
58                                     /* to update channel. */
59 
60 /* Suppression gain parameters: SUPGAIN parameters in Q-(RESOLUTION_SUPGAIN). */
61 #define RESOLUTION_SUPGAIN      8     /* Channel in Q-(RESOLUTION_SUPGAIN). */
62 #define SUPGAIN_DEFAULT (1 << RESOLUTION_SUPGAIN)  /* Default. */
63 #define SUPGAIN_ERROR_PARAM_A   3072  /* Estimation error parameter */
64                                       /* (Maximum gain) (8 in Q8). */
65 #define SUPGAIN_ERROR_PARAM_B   1536  /* Estimation error parameter */
66                                       /* (Gain before going down). */
67 #define SUPGAIN_ERROR_PARAM_D   SUPGAIN_DEFAULT /* Estimation error parameter */
68                                 /* (Should be the same as Default) (1 in Q8). */
69 #define SUPGAIN_EPC_DT  200     /* SUPGAIN_ERROR_PARAM_C * ENERGY_DEV_TOL */
70 
71 /* Defines for "check delay estimation" */
72 #define CORR_WIDTH      31      /* Number of samples to correlate over. */
73 #define CORR_MAX        16      /* Maximum correlation offset. */
74 #define CORR_MAX_BUF    63
75 #define CORR_DEV        4
76 #define CORR_MAX_LEVEL  20
77 #define CORR_MAX_LOW    4
78 #define CORR_BUF_LEN    (CORR_MAX << 1) + 1
79 /* Note that CORR_WIDTH + 2*CORR_MAX <= MAX_BUF_LEN. */
80 
81 #define ONE_Q14         (1 << 14)
82 
83 /* NLP defines */
84 #define NLP_COMP_LOW    3277    /* 0.2 in Q14 */
85 #define NLP_COMP_HIGH   ONE_Q14 /* 1 in Q14 */
86 
87 #endif
88