public class FilterOneZero extends UnitFilter
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).
FilterLowPass| Modifier and Type | Field and Description |
|---|---|
UnitVariablePort |
a0 |
UnitVariablePort |
a1 |
input, outputFALSE, TRUE| Constructor and Description |
|---|
FilterOneZero() |
| Modifier and Type | Method and Description |
|---|---|
void |
generate(int start,
int limit)
Perform essential synthesis function.
|
getInput, getOutputaddPort, addPort, convertHalfLifeToMultiplier, flattenOutputs, generate, getCircuit, getFramePeriod, getFrameRate, getPortByName, getPorts, getSynthesisEngine, getSynthesizer, getTopUnit, getUnitGenerator, isEnabled, pullData, setCircuit, setEnabled, setFrameRate, setPort, setSynthesisEngine, start, start, stop, stopequals, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitgetUnitGenerator, start, start, stop, stopgetUnitGeneratorpublic UnitVariablePort a0
public UnitVariablePort a1
public void generate(int start,
int limit)
UnitGeneratorgenerate in class UnitGeneratorstart - offset into port bufferslimit - limit offset into port buffers for loop