Difference between revisions of "Ethersound latency"
(New page: 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...) |
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The latency was measured with the following equipment: | The latency was measured with the following equipment: | ||
* ES220 as | * Digigiram ES220 as an input device | ||
* | * another ES220 as a reference output device | ||
* Exstreamer 100 (VLSI based device) | * Exstreamer 100 as an output device (VLSI based device) | ||
* Annuncicom 100 (Micronas based device) | * Annuncicom 100 as an output device (Micronas based device) | ||
* HP procurve 1700-8 switch where all devices were connected to | |||
Both Barix devices were loaded with the version 00.03 of the Ethersound decoder module. | Both Barix devices were loaded with the version 00.03 of the Ethersound decoder module. | ||
The input of the ES220 was fed with | The input of the ES220 was fed with a 500Hz tone from a signal generator. The input, both output Barix devices as well as the reference ES220 device were monitored with an oscilloscope. | ||
A trigger was set to capture the | A trigger was set to capture the waveform after switching on the signal generator. | ||
=== Test results === | === Test results === | ||
The | The end-to-end | ||
Revision as of 15:46, 11 February 2009
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:
- Digigiram ES220 as an input device
- another ES220 as a reference output device
- Exstreamer 100 as an output device (VLSI based device)
- Annuncicom 100 as an output device (Micronas based device)
- HP procurve 1700-8 switch where all devices were connected to
Both Barix devices were loaded with the version 00.03 of the Ethersound decoder module.
The input of the ES220 was fed with a 500Hz tone from a signal generator. The input, both output Barix devices as well as the reference ES220 device were monitored with an oscilloscope.
A trigger was set to capture the waveform after switching on the signal generator.
Test results
The end-to-end
