flatmax@632: 
flatmax@593: // Author Matt Flax <flatmax@>
flatmax@593: //
flatmax@593: // This C++ file is part of an implementation of Lyon's cochlear model:
flatmax@593: // "Cascade of Asymmetric Resonators with Fast-Acting Compression"
flatmax@593: // to supplement Lyon's upcoming book "Human and Machine Hearing"
flatmax@593: //
flatmax@593: // Licensed under the Apache License, Version 2.0 (the "License");
flatmax@593: // you may not use this file except in compliance with the License.
flatmax@593: // You may obtain a copy of the License at
flatmax@593: //
flatmax@593: //     http://www.apache.org/licenses/LICENSE-2.0
flatmax@593: //
flatmax@593: // Unless required by applicable law or agreed to in writing, software
flatmax@593: // distributed under the License is distributed on an "AS IS" BASIS,
flatmax@593: // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
flatmax@593: // See the License for the specific language governing permissions and
flatmax@593: // limitations under the License.
flatmax@593: #ifndef PSYCHOACOUSTICS_H_
flatmax@593: #define PSYCHOACOUSTICS_H_
flatmax@593: 
flatmax@593: #include "CARFACCommon.H"
flatmax@593: 
flatmax@593: class PsychoAcoustics {
flatmax@593: public:
flatmax@593:     PsychoAcoustics() {}
flatmax@593:     virtual ~PsychoAcoustics() {}
flatmax@593: 
flatmax@593:     /** Auditory filter nominal Equivalent Rectangular Bandwidth
flatmax@593:         Ref: Glasberg and Moore: Hearing Research, 47 (1990), 103-138
flatmax@593:      ERB = 24.7 * (1 + 4.37 * CF_Hz / 1000);
flatmax@593:      \param CFHz The central frequency to find the ERB at.
flatmax@593:      \param ERBBreakFreq The linear scaling factor for frequency
flatmax@593:      \param ERBQ The tuning of the rectangular bandwidth
flatmax@593:     */
flatmax@593:     static FP_TYPE Hz2ERB(FP_TYPE CFHz, FP_TYPE ERBBreakFreq=1000./4.37 /* 228.833 */, FP_TYPE ERBQ=1000./(24.7*4.37) /* 9.2645 */);
flatmax@593: 
flatmax@593:     /** Auditory filter nominal Equivalent Rectangular Bandwidth
flatmax@593:         Ref: Glasberg and Moore: Hearing Research, 47 (1990), 103-138
flatmax@593:      ERB = 24.7 * (1 + 4.37 * CF_Hz / 1000);
flatmax@593:      \param CFHz The central frequency to find the ERB at.
flatmax@593:      \param ERBBreakFreq The linear scaling factor for frequency
flatmax@593:      \param ERBQ The tuning of the rectangular bandwidth
flatmax@593:     */
flatmax@593:     static Array<FP_TYPE, Dynamic, 1> Hz2ERB(Array<FP_TYPE, Dynamic, 1> &CFHz, FP_TYPE ERBBreakFreq=1000./4.37 /* 228.833 */, FP_TYPE ERBQ=1000./(24.7*4.37) /* 9.2645 */);
flatmax@593: };
flatmax@593: 
flatmax@593: #endif // PSYCHOACOUSTICS_H_