fi.helsinki.cs.ohtu.mpeg2.audio.mpa
Class QuantizationTables.QuantizationTable

java.lang.Object
  fi.helsinki.cs.ohtu.mpeg2.audio.mpa.QuantizationTables.QuantizationTable

Enclosing class:

QuantizationTables

public static class QuantizationTables.QuantizationTable
extends java.lang.Object

Represents a quantization table for MPEG-1 Layer II audio.

Field Summary

private int[]	levelBits
private int[][]	levels

Constructor Summary

private

QuantizationTables.QuantizationTable(int table)

Method Summary

int	getBits(int sb, int level) Returns number of bits to represent given sub-band with a particular quantization level.
int	getGranuleBits(int sb, int level)
int	getLevelBits(int sb) Returns number of level bits for given sub-band.
double	getSNR(int sb, int level) Returns signal-to-noise ratio in dB for given sub-band with given quantization level.
int	getSteps(int sb, int level) Returns number of quantization steps for given sub-band and quantization level.
boolean	isGrouped(int sb, int level) Returns true iff given samples of a given sub-band with a particular quantization level are grouped to granules.

Methods inherited from class java.lang.Object

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

Field Detail

levels

private final int[][] levels

levelBits

private final int[] levelBits

Constructor Detail

QuantizationTables.QuantizationTable

private QuantizationTables.QuantizationTable(int table)

Method Detail

getLevelBits

public int getLevelBits(int sb)

Returns number of level bits for given sub-band.

getSteps

public int getSteps(int sb,
                    int level)

Returns number of quantization steps for given sub-band and quantization level.

getBits

public int getBits(int sb,
                   int level)

Returns number of bits to represent given sub-band with a particular quantization level.

isGrouped

public boolean isGrouped(int sb,
                         int level)

Returns true iff given samples of a given sub-band with a particular quantization level are grouped to granules.

getGranuleBits

public int getGranuleBits(int sb,
                          int level)

getSNR

public double getSNR(int sb,
                     int level)

Returns signal-to-noise ratio in dB for given sub-band with given quantization level.

Parameters:

sb - Sub-band

level - Quantization level

Returns:

Signal-to-noise ratio in dB