Voice

Codec

Codec is the component of any voice system that translates between analog speech and the bits used to transmit them. Every codec transmits a burst of data in a packet that can be reconstructed into voice.

Five different standards of voice codec’s are given which can be selected depending on the variations required. Packet size and Inter-arrival time value will vary depending on the codec value chosen.

Packet Size

Distribution: The options available for distribution are,

  • Constant
  • Exponential

Packet Size (Bytes): Sets the size of the packets being generated by the chosen distribution. By default 160 bytes is entered.

Inter Arrival Time

This indicates the time gap between packets.

Distribution: The options available for distribution are,

  • Constant
  • Exponential

Inter Arrival Time: Enter the average inter-arrival time between packets. A lower inter-arrival time would lead to a higher generation rate and vice versa. By default 20000 Micro Sec is entered.

Service Type

  • CBR - CBR stands for Constant Bit Rate. Packets of constant size are generated at constant inter arrival times.
  • VBR - VBR stands for Variable Bit Rate. The two types of Suppression Model that can be selected are,
  • Deterministic
  • Markov Chain

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