AVProAlliance AViMUX4 Betriebs- und Anwendungshandbuch - Seite 12

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Microphone Selection Switching

The iMUX4 has four separate microphone inputs. These inputs are switched to the RTA or iAI2

ANALOG INPUT jack by the five-position MICROPHONE SELECTION switch on the

iMUX4. The first four positions are labeled 1, 2, 3, and 4. These positions switch only the

respective single microphone input to the RTA. These positions are used to calibrate the

individual mic inputs or to monitor the response of only one location in a multiple microphone

setup.

iMUX4

MICROPHONE

MULTIPLEXER

MIC 1

MIC 2

MICROPHONE

SELECTION

Figure 8. Microphones are selected or multiplexed

to the RTA with the MICROPHONE SELECTION

switch. LEDs indicate which microphone(s) are

selected or active.

The fifth position of the MICROPHONE

SELECTION switch is labeled "1-4." This

position electronically selects each of the

iMUX4's MIC IN jacks momentarily. The

iMUX4 alternately switches to each of the

active microphone inputs, providing a path

from these inputs to the OUTPUT jack.

To multiplex between microphones to analyze with the iAI2 connected to AudioTools iPad App:

1. Connect a cable from the iAI2 Microphone jack to the iMUX4's OUTPUT jack. Power up

the iAI2 and open AudioTools. Once the iAI2 is connected to the iPad there should be an

indication that the audio interface is connected.

Microphone Setup. Select the iAI2 microphone input and confirm calibration. Select

position "1-4" on the iMUX4 MICROPHONE SELECTION switch.

2. Connect desired microphones to iMUX4 MIC IN jacks.

3. LED indicators indicate the MIC Inputs that are being alternately selected by the iMUX4.

The dwell time, or time each MIC Input is selected, is factory set by the iMUX4 internal circuits

to about one second. This time has been optimized for Real Time Analyzing (RTA) when using

AudioTools. This time can be made longer or shorter for special applications by changing the

Multiplex Rate control located near the OUTPUT jack of the iMUX4.

MIC 3

MIC 4

1-4

The multiplex switching action is done only

between active MIC Inputs. An iMUX4 MIC

Input jack is active if a microphone is

connected to the jack. MIC IN jacks that do

not have a microphone connected to them will

be omitted from the multiplex switching

sequence.

Each active microphone input is selected for

approximately one second. The MIC input

selected is indicated by an illuminated LED.

As different inputs are alternately selected,

the different LEDs light, indicating multiplex

switching.

NOTE: MIC Inputs are active only when a

microphone is connected and drawing current

from the iMUX4. If a microphone is not

connected to a particular input, the iMUX4

will not switch to that MIC In jack. This

permits the iMUX4 to multiplex switch to only

the active inputs. In this manner, the iMUX4

can multiplex switch between 2, 3 or 4 active

microphones.

In AudioTools select Settings then