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