How to Generate a Wav File from Byte-TS Flow

This page describes the method for generating a wav file from the Byte-TS flow recorded over an ISDN B channel. This is acheived by using the "Analog" properties in the Clarinet filter used on-line (filter name defined in the profile) or off-line (Filter-Run Protocol).

Connecting the unit and setting the test conditions

The connections of Clarinet-Book USB units and the test condition settings for basic monitoring are detailed in the following page:

Setting the test conditions for BYTE-TS / Analog filter

The protocol filter file Isdn_xx_bts_analog.acf  (Isdn_etsi_bts_analog.acf or Isdn_att_bts_analog.acf or Isdn_ni2_bts_analog.acf) created with the Wizard from the Template list) specifies the stack of protocol.

As Byte-TS is defined at layer 1 in "Data Link" , the "analog" protocol is added to layer 2

The "Analog Measurement" tab of the filter includes specifications for both functions: wav file generation and QoS measurement. The filter file Isdn_etsi_bts_analog.acf  is configured only to generate wav files.

  • Modifications of the filter to apply in "Received Voice" part:
    • The codec specifications must correspond to the value used in the digital data flow (G711 mLaw, G711 ALaw, ...).
    • The output file must specify:
    • The file name (default= bts_analog.wav)
    • The encoding specifications of the file.wav
  • The quality measurement should be set to "Off" if the purpose is only to generate wav files.

Generating the Wav file

The wav files are automatically created in the working directory: with the basename defined in the filter file (Bts_analog_xx.wav as an example). 

Applying the filter conditions

  • Off-line by using Filter èRun Protocol:
    • Source file including the Byte-TS events (Isdn_etsi_mon_e1.ace as an example).
    • Filter name (isdn_etsi_bts_analog.acf  as an example)
    • Result file generated (Isdn_etsi_mon_e1_rlt.ace as an example).
  • On-line, at the end of the profile execution, with the following settings:
    • Configuration file set as WI_ANALOG by Clarinet-Init
    • Filter name defined in the profile to be executed
Related topics:
Generation of Analog events
Analog filter specifications
 

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