SynthUnit.java

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/*
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 * Copyright (C) 2015 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.common.midi.synth;
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public abstract class SynthUnit {
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    private static final double CONCERT_A_PITCH = 69.0;
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    private static final double CONCERT_A_FREQUENCY = 440.0;
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    /**
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     * @param pitch
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     *            MIDI pitch in semitones
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     * @return frequency
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     */
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    public static double pitchToFrequency(double pitch) {
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        double semitones = pitch - CONCERT_A_PITCH;
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        return CONCERT_A_FREQUENCY * Math.pow(2.0, semitones / 12.0);
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    }
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    public abstract float render();
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}

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SynthUnit.java