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/************************************************/
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/* Lip Filter Object by Perry R. Cook, 1995-96 */
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/* The lip of the brass player has dynamics */
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/* which are controlled by the mass, spring */
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/* constant, and damping of the lip. This */
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/* filter simulates that behavior and the */
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/* transmission/reflection properties as */
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/* well. See Cook TBone and HosePlayer */
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/* instruments and articles. */
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/************************************************/
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coeffs[0] = (MY_FLOAT) 0.0;
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coeffs[1] = (MY_FLOAT) 0.0;
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filter->setZeroCoeffs(coeffs);
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void LipFilt :: clear()
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lastOutput = (MY_FLOAT) 0.0;
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void LipFilt :: setFreq(MY_FLOAT frequency)
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coeffs[0] = (MY_FLOAT) 2.0 * (MY_FLOAT) 0.997 *
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(MY_FLOAT) cos(TWO_PI * frequency / SRATE); /* damping should change with */
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coeffs[1] = (MY_FLOAT) (-0.997 * 0.997); /* lip parameters, but not yet.*/
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filter->setPoleCoeffs(coeffs);
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filter->setGain((MY_FLOAT) 0.03);
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/* NOTE: Here we should add lip tension */
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/* settings based on Mass/Spring/Damping */
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MY_FLOAT LipFilt :: tick(MY_FLOAT mouthSample,MY_FLOAT boreSample)
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/* Perform "Table Lookup" By Polynomial Calculation */
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temp = mouthSample - boreSample; /* Differential pressure */
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temp = filter->tick(temp); /* Force -> position */
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temp = temp*temp; /* Simple position to area mapping */
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if (temp > 1.0) temp = (MY_FLOAT) 1.0; /* Saturation at + 1.0 */
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lastOutput = temp * mouthSample; /* Assume mouth input = area */
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lastOutput += ((MY_FLOAT) 1.0 - temp) * boreSample; /* and Bore reflection is compliment. */
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MY_FLOAT LipFilt :: lastOut()
added
removed
synti/stklib/LipFilt.cpp
