Televic Confidea CD G3, Описание системы

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7
Microph
one
23
7 Microphone
7.1 Introduction
The Confidea-D MIC30SL (30 cm) - D MIC40SL (40 cm) - D MIC50SL (50 cm) pluggable
microphone is used with the different delegate- and chairman units. This microphone ha a uni-
directional response for optimum performance even in noisy conditions, and has a very low
susceptibility to RF-interference from mobile phones.
7.2 Electrical and acoustic properties
7.3 Microphone connector
- pin 1 : microphone GND
- pin 2 : microphone signal
- pin 3 : unused
- pin 4 : LED +
- pin 5 : LED –
7.4 Operation
The microphone contains the following elements.
Transducer type
Back electret (condenser)
Operating principle
Pressure gradient
Polar pattern
Uni-directional,
cardioïd
Nominal impedance
Bias resistor = 1k2
Vdd = 3.3 V DC,
SPL = 1Pa
Max.SPL at 1 kHz
110 DB SPL (1% THD+N)
Signal to noise ratio
>67 dB(A)
Free field sensitivity
9.4 mV/Pa, ±3 dB @ 1 kHz or
(-40.5 dB, 0 dB = 1 V/Pa @ 1 kHz)
Power supply
3.3 V DC, 0.5 mA
Consumption
0.5 mA (without LED ring);
max. 25 mA (with illuminated ring)