iulaw

Functions

int main(int argc, char *argv[])

iulaw [ option ] [ infile ]

  • -v double

    • absolute maximum value of input \((0 < V)\)

  • -u double

    • compression factor \((0 < \mu)\)

  • infile str

    • double-type compressed data sequence

  • stdout

    • double-type output data sequence

In the below example, 8-bit compressed and quantized data read from data.ulaw is transformed into raw waveform.

dequantize data.ulaw | iulaw > data.raw
Parameters:

  • argc – [in] Number of arguments.

  • argv – [in] Argument vector.

Returns:

0 on success, 1 on failure.

See also

ulaw

class MuLawExpansion

Nonlinearly decompress data based on \(\mu\)-law algorithm.

Given the input data \(y(n)\), the expansion is performed as follows:

\[ x(n) = V \, \mathrm{sgn}(y(n)) \frac{(1 + \mu)^{|y(n)|/V} - 1}{\mu} \]
where \(V\) is the absolute maximum value of the input data and \(\mu\) is the compression factor, which is typically set to 255.

Public Functions

MuLawExpansion(double abs_max_value, double compression_factor)
Parameters:

  • abs_max_value – [in] Absolute maximum value.

  • compression_factor – [in] Compression factor, \(\mu\).

inline double GetAbsMaxValue() const
Returns:

Absolute maximum value.

inline double GetCompressionFactor() const
Returns:

Compression factor.

inline bool IsValid() const
Returns:

True if this object is valid.

bool Run(double input, double *output) const
Parameters:

  • input – [in] Input data.

  • output – [out] Output data.

Returns:

True on success, false on failure.

bool Run(double *input_and_output) const
Parameters:

input_and_output – [inout] Input/output data.

Returns:

True on success, false on failure.