This is the gr-vocoder package. This package includes the various
vocoder blocks in GNU Radio. To use the vocoder blocks, the Python
namespaces is in gnuradio.vocoder, which would be normally imported
as:

    from gnuradio import vocoder

See the Doxygen documentation for details about the blocks available
in this package. A quick listing of the details can be found in Python
after importing by using: 

    help(vocoder)