VoIP_Speaker_DSP-5
Author: Bogen

Setting DSP Parameters

When you select DSP (Digital Signal Processing) from the appliance’s web UI, the DSP page appears.

From this page, you can set parameters for DSP, which is a form of processing that uses digital data to simulate characteristics found in analog circuits. With DSP, you can alter analog signals, such as audio signals, that have been converted to a digital format.

You can also select Save Settings to Server to back up all configuration settings to the Nyquist server.

The DSP page allows you to adjust the signal level for the Output channel, as well as viewing level indicators for both the input and output signals. Selecting the DSP Features button (hamburger menu above the OUT signal indicator) displays a menu that allows you to access DSP features, as described in the following table.

Tip:​You can select Save Settings to Server to back up all configuration settings to the Nyquist server.

Note: The slide control controls the input gain of the microphone, not the output level of the speaker. To control the output level of the speaker, use the Intercom Cut Level control for this station on the Nyquist server.

Table 6. DSP Features

Intercom Tuning | Allows you to specify settings used in intercom calls and when the intercom switches between send and receive modes.

Setting the Channel Level

The channel level control is a channel fader, which is adjusted in 1-dB increments and controls the microphone volume level for the channel. The channel levels can range from −60 to +12 dB. If you place the mouse over the fader, the numerical value of the level appears.

Adjusting Volume Levels

The channel fader control can be used to adjust the channel’s microphone volume level in 1-dB increments between −60 and +12 dB. The overall adjusted microphone volume level of the channel signal can be viewed on the OUT VU meter, marked in 2-dB increments between −60 and 0 dB.

To adjust the channel volume level:

1​On the appliance Web UI’s main page, select DSP.

2​Use the channel’s fader to adjust the volume level.

Knob Adjustments

Many DSP controls use knobs to adjust one or more settings. The value of a knob can be adjusted in one of two ways:

1​Click the knob control, hold the mouse button down, and drag the mouse up or down to increase or decrease the value.

2​Double-click the knob, type a value into the resulting popup, and click the Save button.

Intercom Tuning

The VoIP Speaker provides half-duplex communications, which means that only one party can transmit at a time. Which party can transmit (i.e., this VoIP Speaker or the Admin Phone) is controlled automatically by the Intercom Tuning settings. Whenever a signal from the calling station exceeds a certain level—known as the switching sensitivity level—the VoIP Speaker switches to receive mode, allowing the party using the Admin Phone to speak. When the signal is below that level, it switches back to send mode, allowing the party using the VoIP Speaker to speak.

Selecting Intercom Tuning from the Menu icon on the DSP page displays the Intercom Tuning page. The intercom is designed to turn off the speaker while the intercom user is talking and turn off the microphone while the remote user is talking. This DSP feature defines at what input and output levels the intercom will switch between the microphone and the speaker.

The Intercom Tuning page has level indicators for input and output signals and contains the following settings (see Table 7).

Table 7. Intercom Tuning Settings

Switching Sensitivity | Specifies the minimum level of the received (i.e., speaker) signal at which the microphone will be muted and the speaker will be enabled. The range is −144 to +24 dB.
Talkback Threshold | Specifies the minimum talkback (i.e., microphone) signal level at which the microphone will be enabled. The lower the level, the more sensitive the microphone is to activating. The range is −144 to +24 dB.
Talkback Decay | Specifies the rate (in dB/second) at which the noise gate that enables the talkback (i.e., microphone) signal will close once opened. A larger value will disable the microphone sooner; a smaller value will keep it enabled longer. Tip:​If the microphone audio sounds choppy, set this to a smaller value. The range is 0 to +1000 dB/sec.