com.jsyn.unitgen
Class FilterOneZero
java.lang.Object
com.jsyn.unitgen.UnitGenerator
com.jsyn.unitgen.UnitFilter
com.jsyn.unitgen.FilterOneZero
- All Implemented Interfaces:
- UnitSink, UnitSource
public class FilterOneZero
- extends UnitFilter
First Order, One Zero filter using the following formula:
y( n ) = A0 * x( n ) + A1 * x( n - 1 )
where y(n) is Output, x(n) is Input and x(n-1) is Input at the prior sample
tick.
Setting A1 positive gives a low-pass response; setting A1 negative gives a
high-pass response. The bandwidth of this filter is fairly high, so it often
serves a building block by being cascaded with other filters.
If A0 and A1 are both 0.5, then this filter is a simple averaging lowpass
filter, with a zero at SR/2 = 22050 Hz.
If A0 is 0.5 and A1 is -0.5, then this filter is a high pass filter, with a
zero at 0.0 Hz.
A thorough description of the digital filter theory needed to fully describe
this filter is beyond the scope of this document. Calculating coefficients is
non-intuitive; the interested user is referred to one of the standard texts
on filter theory (e.g., Moore, "Elements of Computer Music", section 2.4).
Method Summary |
void |
generate(int start,
int limit)
Perform essential synthesis function. |
Methods inherited from class com.jsyn.unitgen.UnitGenerator |
addPort, convertHalfLifeToMultiplier, flattenOutputs, generate, getFramePeriod, getFrameRate, getPortByName, getPorts, getSynthesisEngine, isEnabled, pullData, setCircuit, setFrameRate, setSynthesisEngine, start, stop |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
a0
public UnitVariablePort a0
a1
public UnitVariablePort a1
FilterOneZero
public FilterOneZero()
generate
public void generate(int start,
int limit)
- Description copied from class:
UnitGenerator
- Perform essential synthesis function.
- Specified by:
generate
in class UnitGenerator
- Parameters:
start
- offset into port bufferslimit
- limit offset into port buffers for loop