Some corrections in tests for module 'sigproc'.

Signed-off-by: Eduardo Tenorio <embatbr@gmail.com>
Inserting mel scale (with images) in tests for module 'features'.

Signed-off-by: Eduardo Tenorio <embatbr@gmail.com>
Updating draft report.

Signed-off-by: Eduardo Tenorio <embatbr@gmail.com>
Updating draft report and tests for module 'features'.

Signed-off-by: Eduardo Tenorio <embatbr@gmail.com>
Simplificando a criação de imagens de teste.

Signed-off-by: Eduardo Tenorio <embatbr@gmail.com>
Simplifying module 'useful'.

Signed-off-by: Eduardo Tenorio <embatbr@gmail.com>
Function 'testmultiplot' from module 'useful' now is 'multiplotfile'. Tests (and output images) from module 'features' are improved. Draft report updated.

Signed-off-by: Eduardo Tenorio <embatbr@gmail.com>
Drawing image of the power spectrum filterbanked.

Signed-off-by: Eduardo Tenorio <embatbr@gmail.com>