18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package com.sun.media.sound;
26
27 /**
28 * Infinite impulse response (IIR) filter class.
29 *
30 * The filters where implemented and adapted using algorithms from musicdsp.org
31 * archive: 1-RC and C filter, Simple 2-pole LP LP and HP filter, biquad,
32 * tweaked butterworth RBJ Audio-EQ-Cookbook, EQ filter kookbook
33 *
34 * @author Karl Helgason
35 */
36 public final class SoftFilter {
37
38 public final static int FILTERTYPE_LP6 = 0x00;
39 public final static int FILTERTYPE_LP12 = 0x01;
40 public final static int FILTERTYPE_HP12 = 0x11;
41 public final static int FILTERTYPE_BP12 = 0x21;
42 public final static int FILTERTYPE_NP12 = 0x31;
43 public final static int FILTERTYPE_LP24 = 0x03;
44 public final static int FILTERTYPE_HP24 = 0x13;
45
46 //
47 // 0x0 = 1st-order, 6 dB/oct
48 // 0x1 = 2nd-order, 12 dB/oct
49 // 0x2 = 3rd-order, 18 dB/oct
50 // 0x3 = 4th-order, 24 db/oct
51 //
52 // 0x00 = LP, Low Pass Filter
53 // 0x10 = HP, High Pass Filter
54 // 0x20 = BP, Band Pass Filter
55 // 0x30 = NP, Notch or Band Elimination Filter
56 //
57 private int filtertype = FILTERTYPE_LP6;
58 private final float samplerate;
59 private float x1;
60 private float x2;
61 private float y1;
62 private float y2;
63 private float xx1;
64 private float xx2;
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18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package com.sun.media.sound;
26
27 /**
28 * Infinite impulse response (IIR) filter class.
29 *
30 * The filters where implemented and adapted using algorithms from musicdsp.org
31 * archive: 1-RC and C filter, Simple 2-pole LP LP and HP filter, biquad,
32 * tweaked butterworth RBJ Audio-EQ-Cookbook, EQ filter kookbook
33 *
34 * @author Karl Helgason
35 */
36 public final class SoftFilter {
37
38 public static final int FILTERTYPE_LP6 = 0x00;
39 public static final int FILTERTYPE_LP12 = 0x01;
40 public static final int FILTERTYPE_HP12 = 0x11;
41 public static final int FILTERTYPE_BP12 = 0x21;
42 public static final int FILTERTYPE_NP12 = 0x31;
43 public static final int FILTERTYPE_LP24 = 0x03;
44 public static final int FILTERTYPE_HP24 = 0x13;
45
46 //
47 // 0x0 = 1st-order, 6 dB/oct
48 // 0x1 = 2nd-order, 12 dB/oct
49 // 0x2 = 3rd-order, 18 dB/oct
50 // 0x3 = 4th-order, 24 db/oct
51 //
52 // 0x00 = LP, Low Pass Filter
53 // 0x10 = HP, High Pass Filter
54 // 0x20 = BP, Band Pass Filter
55 // 0x30 = NP, Notch or Band Elimination Filter
56 //
57 private int filtertype = FILTERTYPE_LP6;
58 private final float samplerate;
59 private float x1;
60 private float x2;
61 private float y1;
62 private float y2;
63 private float xx1;
64 private float xx2;
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