From GNU Radio
Builds a polyphase synthesis filterbank.
See  for a guide on these polyphase filterbank blocks.
- Specifies the number of channels
- The prototype filter to populate the filterbank.
- 2x Sample Rate
- Use 2x oversampling or not (default is no)
- Sample Delay
- The sample delay of the underlying filters
- Channel Map
- The Channel Map can be used to rearrange which channels go to which output stream. See Channel Map.