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Polynomial sample rate converter with arbitrary conversion factor

The `dsp.FarrowRateConverter`

System
object™ implements a polynomial-fit sample rate conversion filter using a Farrow
structure. You can use this object to convert the sample rate of a signal up or down by an
arbitrary factor. This object supports fixed-point operations.

To convert the sample rate of a signal:

Create the

`dsp.FarrowRateConverter`

object and set its properties.Call the object with arguments, as if it were a function.

To learn more about how System objects work, see What Are System Objects? (MATLAB).

`frc = dsp.FarrowRateConverter`

`frc = dsp.FarrowRateConverter(Name,Value)`

`frc = dsp.FarrowRateConverter(fsIn,fsOut,tol,np)`

creates a
polynomial filter-based sample rate converter System
object, `frc`

= dsp.FarrowRateConverter`frc`

. For each channel of an input signal,
`frc`

converts the input sample rate to the output sample
rate.

sets properties using one or more name-value pairs. Enclose each property name in single
quotes. `frc`

= dsp.FarrowRateConverter(`Name,Value`

)

```
frc =
dsp.FarrowRateConverter('Specification','Coefficients','Coefficients',[1 2; 3
4])
```

returns a filter that converts from 44.1 kHz to 48 kHz using custom
coefficients that implement a 2nd-order polynomial filter.

returns a sample rate converter System
object, `frc`

= dsp.FarrowRateConverter(`fsIn`

,`fsOut`

,`tol`

,`np`

)`frc`

, with InputSampleRate property set
to `fsIn`

, OutputSampleRate property set
to `fsOut`

, OutputRateTolerance
property set to `tol`

, and PolynomialOrder property set
to `np`

.

**For versions earlier than R2016b, use the step
function to run the System object algorithm. The arguments to
step are the object you created, followed by
the arguments shown in this section.**

**For example, y = step(obj,x) and y = obj(x) perform equivalent operations.**

`y = frc(x)`

To use an object function, specify the
System
object as the first input argument. For
example, to release system resources of a System
object named `obj`

, use
this syntax:

release(obj)

[1] Hentschel, T., and G. Fettweis. "Continuous-Time Digital Filters for Sample-Rate
Conversion in Reconfigurable Radio Terminals." *Frequenz*. Vol. 55,
Number 5-6, 2001, pp. 185–188.

`cost`

|`freqz`

|`fvtool`

|`generatehdl`

|`getActualOutputRate`

|`getPolynomialCoefficients`

|`getRateChangeFactors`

|`info`