mdct.slow.transforms module

Module for calculating DCT type 4 using pure Python

Warning

These core transforms will produce aliasing when used without overlap. Please use mdct unless you know what this means.

mdct.slow.transforms.mdct(x, odd=True)

Calculate modified discrete cosine transform of input signal in an inefficient pure-Python method.

Use only for testing.

Parameters:
  • X (array_like) – The input signal
  • odd (boolean, optional) – Switch to oddly stacked transform. Defaults to True.
Returns:

out – The output signal
Return type:

array_like
mdct.slow.transforms.imdct(X, odd=True)

Calculate inverse modified discrete cosine transform of input signal in an inefficient pure-Python method.

Use only for testing.

Parameters:
  • X (array_like) – The input signal
  • odd (boolean, optional) – Switch to oddly stacked transform. Defaults to True.
Returns:

out – The output signal
Return type:

array_like
mdct.slow.transforms.mdst(x, odd=True)

Calculate modified discrete sine transform of input signal in an inefficient pure-Python method.

Use only for testing.

Parameters:
  • X (array_like) – The input signal
  • odd (boolean, optional) – Switch to oddly stacked transform. Defaults to True.
Returns:

out – The output signal
Return type:

array_like
mdct.slow.transforms.imdst(X, odd=True)

Calculate inverse modified discrete sine transform of input signal in an inefficient pure-Python method.

Use only for testing.

Parameters:
  • X (array_like) – The input signal
  • odd (boolean, optional) – Switch to oddly stacked transform. Defaults to True.
Returns:

out – The output signal
Return type:

array_like
mdct.slow.transforms.cmdct(x, odd=True)

Calculate complex modified discrete cosine transform of input inefficient pure-Python method.

Use only for testing.

Parameters:
  • X (array_like) – The input signal
  • odd (boolean, optional) – Switch to oddly stacked transform. Defaults to True.
Returns:

out – The output signal
Return type:

array_like
mdct.slow.transforms.icmdct(X, odd=True)

Calculate inverse complex modified discrete cosine transform of input signal in an inefficient pure-Python method.

Use only for testing.

Parameters:
  • X (array_like) – The input signal
  • odd (boolean, optional) – Switch to oddly stacked transform. Defaults to True.
Returns:

out – The output signal
Return type:

array_like
mdct.slow.transforms.mclt(x, odd=True)

Calculate complex modified discrete cosine transform of input inefficient pure-Python method.

Use only for testing.

Parameters:
  • X (array_like) – The input signal
  • odd (boolean, optional) – Switch to oddly stacked transform. Defaults to True.
Returns:

out – The output signal
Return type:

array_like
mdct.slow.transforms.imclt(X, odd=True)

Calculate inverse complex modified discrete cosine transform of input signal in an inefficient pure-Python method.

Use only for testing.

Parameters:
  • X (array_like) – The input signal
  • odd (boolean, optional) – Switch to oddly stacked transform. Defaults to True.
Returns:

out – The output signal
Return type:

array_like