net.java.sip.communicator.impl.neomedia.codec.audio.silk
Class Silk_LPC_inv_pred_gain

java.lang.Object
  net.java.sip.communicator.impl.neomedia.codec.audio.silk.Silk_LPC_inv_pred_gain

public class Silk_LPC_inv_pred_gain
extends Object

Compute inverse of LPC prediction gain, and test if LPC coefficients are stable (all poles within unit circle)

Author:

Jing Dai, Dingxin Xu

Field Summary

(package private) static int	A_LIMIT
(package private) static int	QA

Constructor Summary

Silk_LPC_inv_pred_gain()

Method Summary

(package private) static int	SKP_Silk_LPC_inverse_pred_gain_Q13(int[] invGain_Q30, short[] A_Q13, int order) For input in Q13 domain.
(package private) static int	SKP_Silk_LPC_inverse_pred_gain(int[] invGain_Q30, short[] A_Q12, int order) Compute inverse of LPC prediction gain, and test if LPC coefficients are stable (all poles within unit circle).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

QA

static final int QA

See Also:

Constant Field Values

A_LIMIT

static final int A_LIMIT

See Also:

Constant Field Values

Constructor Detail

Silk_LPC_inv_pred_gain

public Silk_LPC_inv_pred_gain()

Method Detail

SKP_Silk_LPC_inverse_pred_gain

static int SKP_Silk_LPC_inverse_pred_gain(int[] invGain_Q30,
                                          short[] A_Q12,
                                          int order)

Compute inverse of LPC prediction gain, and test if LPC coefficients are stable (all poles within unit circle).

Parameters:

invGain_Q30 - Inverse prediction gain, Q30 energy domain

A_Q12 - Prediction coefficients, Q12 [order]

order - Prediction order

Returns:

Returns 1 if unstable, otherwise 0

SKP_Silk_LPC_inverse_pred_gain_Q13

static int SKP_Silk_LPC_inverse_pred_gain_Q13(int[] invGain_Q30,
                                              short[] A_Q13,
                                              int order)

For input in Q13 domain.

Parameters:

invGain_Q30 - Inverse prediction gain, Q30 energy domain.

A_Q13 - Prediction coefficients, Q13 [order].

order - Prediction order.

Returns:

Returns 1 if unstable, otherwise 0.