Precompiled binary of this sample is included in the Demos package. That is reported as DirectSound error code (0x887800032) at the application's status bar.
#Acoustic echo cancellation sound card full
Under Windows 2000 our demo will not be able to create full duplex interface even with AEC turned off: Connect the Attero Tech unDUSB to the Radius AEC via Dante. if you have more than one soundcard, make sure same card is used as default recording and playback device. It is recognized over USB as a standard stereo sound card, and.other application using DirectSound (like WinAmp) may prevent AEC of successful activation.no hardware acceleration can be used along with AEC The Soundweb London Acoustic Echo Cancellation (AEC) Input Cards are designed to populate any of the four card slots on Soundweb London BLU-800, BLU-805.internally audio is processed with 16 kHz sampling rate.you must be running Windowx XP SP2 or later for AEC to be enabled.Microsoft implementation of AEC has some limitations:
We assign CodecIn as a consumer of DX_FullDuplex component, so it will receive and encode audio captured by AEC.Įncoded audio is sent to remote side, and incoming signal is sent to CodecOut component for decoding (decompression).Īfter decoding, a PCM stream should be sent to DX_FullDuplex component, therefore we assign it as a consumer of CodecOut:ĭX_FullDuplex -> CodecIn -> IPClient -> CodecOut -> DX_FullDuplex Instead we have create a new DX_FullDuplex component, which takes care of creating necessary DirectX buffers for audio capture and rendering. Microsoft has implemented AEC as an effect for the capture buffer used in DirectSound API since Windowx XP SP2.īecause AEC is a part of DirectSound, we cannot use our WaveIn and WaveOut components. Echo effect most often occurs when a side's B microphone picks up a signal from side A and rebroadcasts it back at site A:ĪEC module monitors incoming signal on side B, and then removes it from the outgoing signal, taking the room environment into account: