Ethersound latency - Revision history

Achims: /* VLSI based devices */

2013-06-13T09:15:19Z

VLSI based devices

← Older revision		Revision as of 09:15, 13 June 2013
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	=== VLSI based devices ===		=== VLSI based devices ===
	On '''Exstreamer 1xx, Exstreamer 2xx and all Annuncicom devices in DHW: 2.xx ''' the end-to-end latency is approximately '''57ms'''. This is caused by large internal buffers in the VLSI codec.		On '''Exstreamer 1xx, Exstreamer 2xx and all Annuncicom devices in DHW: 2.xx (Device Hardware) ''' the end-to-end latency is approximately '''57ms'''. This is caused by large internal buffers in the VLSI codec.

	=== Micronas based devices ===		=== Micronas based devices ===

Achims: /* Micronas based devices */

2013-06-13T09:14:53Z

Micronas based devices

← Older revision		Revision as of 09:14, 13 June 2013
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	=== Micronas based devices ===		=== Micronas based devices ===
	The internal buffers of the Micronas codec are much smaller which also positively affects the latency.		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 and all Annuncicom devices DHW: 1.xx''' is only about '''6ms'''.		The end-to-end-latency of the '''Exstreamer 1000 and all Annuncicom devices in DHW: 1.xx (Device Hardware)''' is only about '''6ms'''.

	== Latency measurements ==		== Latency measurements ==

Achims: /* Micronas based devices */

2013-06-13T09:14:03Z

Micronas based devices

← Older revision		Revision as of 09:14, 13 June 2013
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	=== Micronas based devices ===		=== Micronas based devices ===
	The internal buffers of the Micronas codec are much smaller which also positively affects the latency.		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 (DHW: 1.xx), Annuncicom 200 (DHW: 1.xx)~~ and Annuncicom ~~1000 (~~DHW: 1.xx)''' is only about '''6ms'''.		The end-to-end-latency of the '''Exstreamer 1000 and all Annuncicom devices DHW: 1.xx''' is only about '''6ms'''.

	== Latency measurements ==		== Latency measurements ==

Achims: /* VLSI based devices */

2013-06-13T09:11:37Z

VLSI based devices

← Older revision		Revision as of 09:11, 13 June 2013
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	=== VLSI based devices ===		=== VLSI based devices ===
	On '''Exstreamer 1xx, Exstreamer 2xx and Annuncicom ~~1xx (~~DHW: 2.xx~~), Annuncicom 2xx (DHW: 2.xx)~~ ''' the end-to-end latency is approximately '''57ms'''. This is caused by large internal buffers in the VLSI codec.		On '''Exstreamer 1xx, Exstreamer 2xx and all Annuncicom devices in DHW: 2.xx ''' the end-to-end latency is approximately '''57ms'''. This is caused by large internal buffers in the VLSI codec.

	=== Micronas based devices ===		=== Micronas based devices ===

Achims: /* VLSI based devices */

2013-06-13T09:09:54Z

VLSI based devices

← Older revision		Revision as of 09:09, 13 June 2013
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	=== VLSI based devices ===		=== 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.		On '''Exstreamer 1xx, Exstreamer 2xx and Annuncicom 1xx (DHW: 2.xx), Annuncicom 2xx (DHW: 2.xx) ''' the end-to-end latency is approximately '''57ms'''. This is caused by large internal buffers in the VLSI codec.

	=== Micronas based devices ===		=== Micronas based devices ===

Achims: /* Micronas based devices */

2013-06-13T09:07:21Z

Micronas based devices

← Older revision		Revision as of 09:07, 13 June 2013
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	=== Micronas based devices ===		=== Micronas based devices ===
	The internal buffers of the Micronas codec are much smaller which also positively affects the latency.		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'''.		The end-to-end-latency of the '''Exstreamer 1000, Annuncicom 100 (DHW: 1.xx), Annuncicom 200 (DHW: 1.xx) and Annuncicom 1000 (DHW: 1.xx)''' is only about '''6ms'''.

	== Latency measurements ==		== Latency measurements ==

Brain: /* Test results */

2009-02-11T15:55:44Z

Test results

← Older revision		Revision as of 15:55, 11 February 2009
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	=== Test results ===		=== Test results ===
	The end-to-end		The below three diagrams show the results of the measurement. The top line (channel 4, green) is the clock source. Channels 1 (yellow), 2 (blue) and 3 (violet) are: the VLSI device (Exstreamer 100), the Micronas device (Annuncicom 100) and the reference ES220.

			'''On the first diagram the 57.2ms latency of the VLSI decoder (Exstreamer 100) can be seen.'''

			[[Image:vlsi_latency.png]]

			'''The second screen shot shows the end-to-end latency using a Micronas based device Annuncicom 100. The latency is significantly lower - only 6ms.'''

			[[Image:micronas_latency.png]]

			'''The last picture shows the end-to-end delay using the reference ES220 device. The latency is 1.44ms.'''

			[[Image:es220_latency.png]]

Brain: /* Latency measurements */

2009-02-11T15:46:17Z

Latency measurements

← Older revision		Revision as of 15:46, 11 February 2009
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	The latency was measured with the following equipment:		The latency was measured with the following equipment:
	* ES220 as ~~the~~ input device		* Digigiram ES220 as an input device
	* ~~HP procurve 1700-8 switch~~		* 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 ~~approximately~~ 500Hz tone from a signal generator ~~and~~ both ~~outputs~~ were monitored with an oscilloscope.		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 ~~response~~ after switching on the signal generator.		A trigger was set to capture the waveform after switching on the signal generator.

	=== Test results ===		=== Test results ===
	The		The end-to-end

Brain: 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...

2009-02-11T15:01:59Z

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...

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 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