1/*****************************************************************************
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3  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
4  more contributor license agreements.  See the NOTICE file distributed
5  with this work for additional information regarding copyright ownership.
6  Accellera licenses this file to you under the Apache License, Version 2.0
7  (the "License"); you may not use this file except in compliance with the
8  License.  You may obtain a copy of the License at
9
10    http://www.apache.org/licenses/LICENSE-2.0
11
12  Unless required by applicable law or agreed to in writing, software
13  distributed under the License is distributed on an "AS IS" BASIS,
14  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
15  implied.  See the License for the specific language governing
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19
20/*****************************************************************************
21
22  biquad.cpp --
23
24  Original Author: Martin Janssen, Synopsys, Inc., 2002-02-15
25
26 *****************************************************************************/
27
28/*****************************************************************************
29
30  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
31  changes you are making here.
32
33      Name, Affiliation, Date:
34  Description of Modification:
35
36 *****************************************************************************/
37
38/* Filename biquad.cc */
39/* This is the implementation file for synchronous process `biquad' */
40
41#include "biquad.h"
42
43void biquad::entry()
44{
45  float Acc; // Accumulator
46  float sample; // Input sample
47
48  if ((bool) reset == true) {
49    Del[0] = Del[1] = Del[2] = Del[3] = 0.0;
50    out.write(0.0);
51    wait();
52  }
53
54  while (true) {
55    sample = in.read();
56    Acc = Cte[0] * sample;
57    for (int i = 0; i < 4; i++) {
58      Acc += Cte[i+1] * Del[i];
59    }
60    //    Acc = Acc / 1024.0;
61    Del[1] = Del[0]; Del[0] = sample;
62    Del[3] = Del[2]; Del[2] = Acc;
63    out.write(Acc);
64    wait();
65  }
66
67} // end of entry function
68