Method frame_init

extlibs/soloud/src/audiosource/speech/klatt.cpp:469–549

*/

void klatt::frame_init()
{
	int mOverallGaindb;                       /* Overall gain, 60 dB is unity  0 to   60  */
	float amp_parF1;                 /* mFormant1Ampdb converted to linear gain  */
	float amp_parFN;                 /* mParallelNasalPoleAmpdb converted to linear gain  */
	float amp_parF2;                 /* mFormant2Ampdb converted to linear gain  */
	float amp_parF3;                 /* mFormant3Ampdb converted to linear gain  */
	float amp_parF4;                 /* mFormant4Ampdb converted to linear gain  */
	float amp_parF5;                 /* mFormant5Ampdb converted to linear gain  */
	float amp_parF6;                 /* mFormant6Ampdb converted to linear gain  */

	/* Read  speech frame definition into temp store
       and move some parameters into active use immediately
       (voice-excited ones are updated pitch synchronously
       to avoid waveform glitches).
	 */

	mF0FundamentalFreq = mFrame.mF0FundamentalFreq;
	mVoicingAmpdb = mFrame.mVoicingAmpdb - 7;

	if (mVoicingAmpdb < 0) mVoicingAmpdb = 0;

	mAmpAspir = DBtoLIN(mFrame.mAspirationAmpdb) * .05f;
	mAmpFrica = DBtoLIN(mFrame.mFricationAmpdb) * 0.25f;
	mSkewnessOfAlternatePeriods = mFrame.mSkewnessOfAlternatePeriods;

	/* Fudge factors (which comprehend affects of formants on each other?)
       with these in place ALL_PARALLEL should sound as close as
	   possible to CASCADE_PARALLEL.
	   Possible problem feeding in Holmes's amplitudes given this.
	*/
	amp_parF1 = DBtoLIN(mFrame.mFormant1Ampdb) * 0.4f;	/* -7.96 dB */
	amp_parF2 = DBtoLIN(mFrame.mFormant2Ampdb) * 0.15f;	/* -16.5 dB */
	amp_parF3 = DBtoLIN(mFrame.mFormant3Ampdb) * 0.06f;	/* -24.4 dB */
	amp_parF4 = DBtoLIN(mFrame.mFormant4Ampdb) * 0.04f;	/* -28.0 dB */
	amp_parF5 = DBtoLIN(mFrame.mFormant5Ampdb) * 0.022f;	/* -33.2 dB */
	amp_parF6 = DBtoLIN(mFrame.mFormant6Ampdb) * 0.03f;	/* -30.5 dB */
	amp_parFN = DBtoLIN(mFrame.mParallelNasalPoleAmpdb) * 0.6f;	/* -4.44 dB */
	mAmpBypas = DBtoLIN(mFrame.mBypassFricationAmpdb) * 0.05f;	/* -26.0 db */

	// Set coeficients of nasal resonator and zero antiresonator 
	mNasalPole.initResonator(mFrame.mNasalPoleFreq, mFrame.mNasalPoleBandwidth, mSampleRate);

	mNasalZero.initAntiresonator(mFrame.mNasalZeroFreq, mFrame.mNasalZeroBandwidth, mSampleRate);

	// Set coefficients of parallel resonators, and amplitude of outputs 
	mParallelFormant1.initResonator(mFrame.mFormant1Freq, mFrame.mFormant1ParallelBandwidth, mSampleRate);
	mParallelFormant1.setGain(amp_parF1);

	mParallelResoNasalPole.initResonator(mFrame.mNasalPoleFreq, mFrame.mNasalPoleBandwidth, mSampleRate);
	mParallelResoNasalPole.setGain(amp_parFN);

	mParallelFormant2.initResonator(mFrame.mFormant2Freq, mFrame.mFormant2ParallelBandwidth, mSampleRate);
	mParallelFormant2.setGain(amp_parF2);

	mParallelFormant3.initResonator(mFrame.mFormant3Freq, mFrame.mFormant3ParallelBandwidth, mSampleRate);
	mParallelFormant3.setGain(amp_parF3);