| /***************************************************************************** |
| |
| Licensed to Accellera Systems Initiative Inc. (Accellera) under one or |
| more contributor license agreements. See the NOTICE file distributed |
| with this work for additional information regarding copyright ownership. |
| Accellera licenses this file to you under the Apache License, Version 2.0 |
| (the "License"); you may not use this file except in compliance with the |
| License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
| implied. See the License for the specific language governing |
| permissions and limitations under the License. |
| |
| *****************************************************************************/ |
| |
| /***************************************************************************** |
| |
| biquad.cpp -- |
| |
| Original Author: Martin Janssen, Synopsys, Inc., 2002-02-15 |
| |
| *****************************************************************************/ |
| |
| /***************************************************************************** |
| |
| MODIFICATION LOG - modifiers, enter your name, affiliation, date and |
| changes you are making here. |
| |
| Name, Affiliation, Date: |
| Description of Modification: |
| |
| *****************************************************************************/ |
| |
| /* Filename biquad.cc */ |
| /* This is the implementation file for synchronous process `biquad' */ |
| |
| #include "biquad.h" |
| |
| void biquad::entry() |
| { |
| float Acc; // Accumulator |
| float sample; // Input sample |
| |
| if (reset.read() == true) { |
| Del[0] = Del[1] = Del[2] = Del[3] = 0.0; |
| out.write(0.0); |
| } |
| else { |
| sample = in.read(); |
| Acc = Cte[0] * sample; |
| for (int i = 0; i < 4; i++) { |
| Acc += Cte[i+1] * Del[i]; |
| } |
| Del[1] = Del[0]; Del[0] = sample; |
| Del[3] = Del[2]; Del[2] = Acc; |
| out.write(Acc); |
| } |
| |
| } // end of entry function |