Install microphones

General microphone characteristics

All CoCon compatible units have a screw-lock connector to insert pluggable microphones.

The recommended speaking distance from the mouth to the top of the microphone is between 20 to 40 cm. In order to accommodate the variety of speakers and speaking distances, microphones are available in three different lengths: 30 cm (D-MIC30SL), 40 cm (D-MIC30SL) and 50 cm (D-MIC50SL).

Technical microphone characteristics

Parameter	Specifications
Material	Brass
Color	Matt black, RAL 9011
Transducer principle	Back electret (condenser)
Operating principle	Pressure gradient
Polar pattern	Unidirectional
Nominal conditions	Bias resistor = 1k2 Vdd = 3.3 VDC SPL = 1 Pa
Max SPL @ 1 kHz	110 dB SPL (1% THD+N)
Signal to noise ratio	> 67 dB(A)
Free field sensitivity	9.4 mV/Pa ± 3dB @ 1 kHz or -40.5 dB, 0 dB = 1V/Pa @ 1 KHz
Power supply	3.3 VDC, 0.5 mA
Consumption	0.5 mA (without LED ring) Max. 25 mA (with LED ring)
Connection	Screw lock

Microphone connector characteristics

Confidea D-MIC microphones have a 5-pin connector to plug into the different CoCon compatible units. Each pin has a distinct function:

Figure 1-43 Microphone connection

1. Pin 1: Microphone GND
2. Pin 2: Microphone signal
3. Pin 3: not used
4. Pin 4: LED +
5. Pin 5: LED -

Microphone Operation Modes

The microphone contains the following elements:

• Indicator ring: shows the status of the microphone
• Union nut: attaches the removable microphone to the unit
• Microphone plug: connects the microphone to the unit

The color of the microphone indicator ring shows the status of the microphone:

Color	Status
Red (continuous)	Microphone is active
Red (blinking)	Last minute of speech time (if set via software) Speech Request (if set via software)
Green (continuous)	Microphone is initialized
Green (blinking)	Microphone request