Maxim, Adobe Flash will only handle Echo Cancellation if the client side Flash Application calls Flash’s “Enhanced audio API”.
I would greatly recommend that OpenMeetings should implement Echo Cancellation, if possible via Flash since this is the platform that OpenMeetings is currently using. The current Echo issue of means that we only use OpenMeetings for its whiteboard and Video sharing. http://www.adobe.com/devnet/flashplayer/articles/acoustic-echo-cancellation.html In addition to acoustic echo cancellation, enhanced audio also provides noise suppression. Previously, Flash Player only provided noise suppression for Speex audio. The new noise-suppression scheme is applied to all captured audio samples. Noise suppression is controlled by the already-existing noiseSuppressionLevel property of the Microphone class and is enabled by default. Setting noiseSuppressionLevel to 0 will disable noise suppression. Enhanced audio has a couple of limitations: •You cannot use enhanced and non-enhanced audio at the same time. •You can only use a single enhanced audio capture at any given time. Operation of enhanced audio is controlled by the enhancedOptions property on your Microphone object and the MicrophoneEnhancedOptions class. The class has the following properties: •MicrophoneEnhancedOptions.mode selects the operation mode for enhanced audio. For possible values, please see the MicrophoneEnhancedMode class. The default value is MicrophoneEnhancedMode.HALF_DUPLEX for USB capture devices and MicrophoneEnhancedMode.FULL_DUPLEX otherwise. •MicrophoneEnhancedOptions.echoPath specifies the echo path length (in milliseconds). A longer echo path means better echo cancellation but also introduces longer delays and requires more processing power. The default value is 128; the only other possible value is 256. •MicrophoneEnhancedOptions.nonLinearProcessing specifies whether to use non-linear processing to suppresses residual echo. A time-domain technique is used; the default value is enabled. Thanks, George Kirkham From: Maxim Solodovnik [mailto:[email protected]] Sent: Tuesday, 9 October 2012 3:44 PM To: [email protected] Subject: Re: Sound issue on laptop due to lack of Acoustic Echo Cancellation (AEC) that is available in Adobe Flash 10/11 I always thought that Flash performs echo cancellation, encodes the sound and then send it to the client. But I'm not really familiar with this. Hopefully Sebastian or Timur can answer this On Tue, Oct 9, 2012 at 10:33 AM, George Kirkham <[email protected]> wrote: Maxim, Selecting “echo cancelation checkbox in Flash settings” does not make any difference because the corresponding client side code is not implemented in OpenMeetings. At least not to my knowledge. Skype has implemented AEC via flash, which is why Echo is an issue for OpenMeetings even with the Echo cancellation checkbox set, but not an issue for Skype. Please correct me if I am wrong. Thanks, George Kirkham From: Maxim Solodovnik [mailto:[email protected]] Sent: Tuesday, 9 October 2012 2:20 PM To: [email protected] Subject: Re: Sound issue on laptop due to lack of Acoustic Echo Cancellation (AEC) that is available in Adobe Flash 10/11 video components are currently in SWF10 try rclick and check echo cancelation checkbox in Flash settings On Tue, Oct 9, 2012 at 6:50 AM, George Kirkham <[email protected]> wrote: Jean-Marie, Sadly the sound issue on laptop is due to lack of Acoustic Echo Cancellation (AEC) that is available in Adobe Flash 10/11 but is not as yet implemented in OpenMeetings. Currently the only solution is to use headphones or speakerphones that support AEC. Examples of hardware which uses AEC are Logitech BCC950 ConferenceCam, ClearOne Chat 60-U, and the Jabra SPEAK410. When I spoke to Sebastian about the problem of echo, he replied; “compiling the SWF10 to SWF11 should not require so much of a code change, it is more a build environment configuration task. I don't think we will transform the SWF8 code to AS3, we rather will concentrate on DHTML.” I am not sure if any changes have yet been made to resolve the echo issue. But I sure wish it was resolved. Thanks, George Kirkham IT Manager Cooperative Research Centre For Greenhouse Gas Technologies (CO2CRC) NFF House, 14 - 16 Brisbane Avenue, Barton, ACT, 2600, Australia T: (02) 6120 1600 F: (02) 6273 7181 E: [email protected], W: www.co2crc.com.au From: Jean-Marie Landri [mailto:[email protected]] Sent: Tuesday, 9 October 2012 4:11 AM To: [email protected] Subject: Sound issue on laptop When using skype, there is no probleme at all ! But when using OpenMeeting, I can hear my voice on others microphone and it become VERY loud ! I need to praticly shut down my speaker, but then I cannot hear other peaple talk ! Everything works fine on Skype, why isn't it working on Open Meeting ? It feels like everyone should wear a headset ! Thank you very much, -- WBR Maxim aka solomax -- WBR Maxim aka solomax
