} QCELPFrame;
/**
- * pre-calculated table for hammsinc function
+ * Pre-calculated table for hammsinc function.
* Only half of the table is needed because of symmetry.
*
* TIA/EIA/IS-733 2.4.5.2-2/3
#define QCELP_OF(variable, bit, len) {offsetof(QCELPFrame, variable), bit, len}
/**
- * bitmap unpacking tables for RATE_FULL
+ * Bitmap unpacking tables for RATE_FULL
*
* TIA/EIA/IS-733 Table 2.4.7.1-1
*/
};
/**
- * bitmap unpacking tables for RATE_HALF
+ * Bitmap unpacking tables for RATE_HALF
*
* TIA/EIA/IS-733 Table 2.4.7.2-1
*/
};
/**
- * bitmap unpacking tables for RATE_QUARTER
+ * Bitmap unpacking tables for RATE_QUARTER
*
* TIA/EIA/IS-733 Table 2.4.7.3-1
*/
};
/**
- * bitmap unpacking tables for RATE_OCTAVE
+ * Bitmap unpacking tables for RATE_OCTAVE
*
* trick: CBSEED is written into QCELPContext.cbsign[15],
* which is not used for RATE_OCTAVE.
};
/**
- * position of the bitmapping data for each packet type in
+ * Bitmapping data position for each packet type in
* the QCELPContext
*/
static const QCELPBitmap * const qcelp_unpacking_bitmaps_per_rate[5] = {
};
/**
- * the final gain scalefactor before clipping into a usable output float
+ * The final gain scalefactor before clipping into a usable output float
*/
#define QCELP_SCALE 8192.
/**
- * table for computing Ga (decoded linear codebook gain magnitude)
+ * Table for computing Ga (decoded linear codebook gain magnitude)
*
* @note The table could fit in int16_t in x*8 form, but it seems
* to be slower on x86
1000.000/QCELP_SCALE};
/**
- * circular codebook for rate 1 frames in x*100 form
+ * Circular codebook for rate 1 frames in x*100 form
*
* TIA/EIA/IS-733 2.4.6.1-2
*/
#define QCELP_RATE_FULL_CODEBOOK_RATIO .01
/**
- * circular codebook for rate 1/2 frames in x*2 form
+ * Circular codebook for rate 1/2 frames in x*2 form
*
* TIA/EIA/IS-733 2.4.6.1-1
*/
#define QCELP_SQRT1887 1.373681186
/**
- * table for impulse response of BPF used to filter
+ * Table for impulse response of BPF used to filter
* the white excitation for bitrate 1/4 synthesis
*
* Only half the tables are needed because of symmetry.
/**
* This spread factor is used, for bitrate 1/8 and I_F_Q,
- * to force the LSP frequencies to be at least 80 Hz apart.
+ * to force LSP frequencies to be at least 80 Hz apart.
*
* TIA/EIA/IS-733 2.4.3.3.2
*/
#define QCELP_LSP_SPREAD_FACTOR 0.02
/**
- * predictor coefficient for the conversion of LSP codes
+ * Predictor coefficient for the conversion of LSP codes
* to LSP frequencies for 1/8 and I_F_Q
*
* TIA/EIA/IS-733 2.4.3.2.7-2
#define QCELP_LSP_OCTAVE_PREDICTOR 29.0/32
/**
- * initial coefficient to perform bandwidth expansion on LPC
+ * Initial coefficient to perform bandwidth expansion on LPC
*
* @note: 0.9883 looks like an approximation of 253/256.
*