Ethersound latency

This page describes the latency of the Ethersound firmware used with different devices.

Latency

The end-to-end latency of an Ethersound encoder and a Barix ES100spkr decoder heavily depends on the codec used.

VLSI based devices

On Exstreamer 100, Exstreamer 110 and Exstreamer 200 the end-to-end latency is approximately 57ms. This is caused by large internal buffers in the VLSI codec.

Micronas based devices

The internal buffers of the Micronas codec are much smaller which also positively affects the latency. The end-to-end-latency of the Exstreamer 1000, Annuncicom 100, Annuncicom 200 and Annuncicom 1000 is only about 6ms.

Latency measurements

Both latencies were measured in the below described test.

Test environment

The latency was measured with the following equipment:

• ES220 as the input device
• HP procurve 1700-8 switch
• Exstreamer 100 (VLSI based device)
• Annuncicom 100 (Micronas based device)

Both Barix devices were loaded with the version 00.03 of the Ethersound decoder module.

The input of the ES220 was fed with approximately 500Hz tone from a signal generator and both outputs were monitored with an oscilloscope.

A trigger was set to capture the response after switching on the signal generator.

Test results

The