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Feature #2154

Integrate IMBE decoding into decoder block.

Added by stevie about 4 years ago. Updated about 4 years ago.

Status:
Closed
Priority:
High
Assignee:
-
Target version:
-
Start date:
Due date:
% Done:

0%

Resolution:
fixed
Spec Reference:

Description

Real-time decoding of IMBE frames with audio output from block.

History

#1 Updated by stevie about 51 years ago

As of rev. 160 the decoder is available and can be selected by setting the environment variable "IMBE" to "soft" before starting the receiver. There is a problem in that the IMBE output is 'choppy' unless allowed to run at full speed (i.e. with no throttling). I think the forecast method is also a problem and this needs further investigation.

#2 Updated by stevie over 50 years ago

  • Status changed from New to Resolved
  • Resolution set to fixed

Final change needed was to make forecast() work properly and then integrate into usrp_p25_rx.py. The block input is (at present) dibit symbols at 4800 symbols/s and the output is mono audio at 8000 samples/s. Thus forecast can determine the correct forecast for input as being 3/5 of the number of output samples required.

#3 Updated by zecke about 4 years ago

  • Project changed from OP25j to OP25

#4 Updated by laforge about 4 years ago

  • Status changed from Resolved to Closed

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