TesiraFORTÉ USB
USB is available on TesiraFORTÉ and EX-UBT devices (see EX-UBT for USB information specific to that device). The USB initialization dialog allows the selection of three different operational modes. See the USB considerations section for more details. USB connections may require the Asynchronus clocking mode to be disabled. Please review the USB_Clocking section if audible artifacts are heard on USB streams.
Initialization Dialog
The two Speakerphone modes provide a single audio input and output stream for use with a soft codec application on a PC. The USB Input represents the incoming audio from the soft codec and the USB Output is used to send audio to the far side.
- Speakerphone: Disables Computer AEC – In this mode, the TesiraFORTÉ unit will provide the Acoustic Echo Cancellation (AEC) function, and a control message is transmitted to the soft codec via the USB link telling it to disable its internal AEC. This would be appropriate for TesiraFORTÉ models that have built-in AEC (CI, TI, VI, VT).
- Speakerphone : Enables Computer AEC – This mode is for situations where the soft codec will provide the Acoustic Echo Cancellation (AEC) function, which would be appropriate for TesiraFORTÉ models that do not have built-in AEC (AI).
- Line In/Out – This mode provides up to 8 channels of audio. Input channels, Output channels or both can be selected, and the number of channels can be specified. Combinations of 2, 4 or 6 total USB channels can operate in 24-bit or 16-bit mode, selected by the Bit Depth control. Combinations of 8 total USB channels operate in 16-bit mode only. When connected and configured, the TesiraFORTÉ device installs the chosen number of input and output channels in Windows, but they are not enabled by default. The channels can be enabled in the Windows Control Panel, and then selected as Record and Playback channels in the audio software application.
NOTE: There is no AEC capability on the USB inputs since they are line level sources and/or far end sources. Microphones used in distance conferencing should be connected to AEC inputs.
NOTE: When operating the software in FORTÉ only mode, adding USB blocksare disabled on the I/O menu.
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When operating the software in FORTÉ only mode, adding USB blocks will be disabled on the I/O menu. These blocks can be added or removed from the initialization dialog by right click on the any other I/O block associated with that FORTÉ then selecting 'Edit Block Parameters'. USB blocks can also be removed by selecting the USB I/O and deleting when in the layout. |
DSP Block Representation
Control Dialog
USB Input
| Name | Description | Range |
| Peak | A software indicator that flashes when the input signal is within 6dB of clipping | |
| Mute | turns the input signal on/off. | |
| Level | adjusts the relative input volume | -100 to +12 |
| USB Status | Connected and Streaming status are shown | Dark - Off Green - On |
USB Output
| Name | Description | Range |
| Mute | turns the input signal on/off. | |
| Level | adjusts the relative output volume | -100 to 0 |
| USB Status | Connected and Streaming status are shown | Dark - Off Green - On |