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dsp.RCToAutocorrelation System object

Convert reflection coefficients to autocorrelation coefficients


The RCToAutocorrelation object converts reflection coefficients to autocorrelation coefficients.

To convert reflection coefficients to autocorrelation coefficients:

  1. Define and set up your System object™. See Construction.

  2. Call step to convert reflection coefficients according to the properties of dsp.RCToAutocorrelation. The behavior of step is specific to each object in the toolbox.


Starting in R2016b, instead of using the step method to perform the operation defined by the System object, you can call the object with arguments, as if it were a function. For example, y = step(obj,x) and y = obj(x) perform equivalent operations.


rc2ac = dsp.RCToAutocorrelation returns an RCToAutocorrelation System object, rc2ac. This object converts reflection coefficients to autocorrelation coefficients, assuming an error power of 1.

rc2ac = dsp.RCToAutocorrelation('PropertyName',PropertyValue,...) returns an object, rc2ac, that converts reflection coefficients into autocorrelation coefficients, with each specified property set to the specified value.



Enable prediction error power input

Choose how to select the prediction error power. When you set this property to true, you must specify the prediction error power as a second input to the step method. When you set this property to false, the object assumes a prediction error power of 1. The default is false.


stepConvert columns of reflection coefficients to autocorrelation coefficients
Common to All System Objects

Create System object with same property values


Expected number of inputs to a System object


Expected number of outputs of a System object


Check locked states of a System object (logical)


Allow System object property value changes


expand all

Note: This example runs only in R2016b or later. If you are using an earlier release, replace each call to the function with the equivalent step syntax. For example, myObject(x) becomes step(myObject,x).

k = [-0.8091 0.2525 -0.5044 0.4295 -0.2804 0.0711].';
rc2ac = dsp.RCToAutocorrelation;
ac = rc2ac(k);


This object implements the algorithm, inputs, and outputs described on the LPC/RC to Autocorrelation block reference page. The object properties correspond to the block parameters, except:

  • There is no object property that corresponds to the Type of conversion block parameter.

  • PredictionErrorInputPort is a pop-up menu choice on the block. Setting the PredictionErrorInputPort object property to false corresponds to selecting Assume P = 1 in the pop-up menu. Setting PredictionErrorInputPort to true corresponds to selecting Via input port from the pop-up menu.

Extended Capabilities

Introduced in R2012a

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