Televic D-CERNO - Microphones

D-Cerno Wired System
Installation and User Manual
Televic Conference Systems
V0.4 - December 6, 2012
22
Make sure that the units are not positioned too close
to each other. It is recommended to keep a distance
of 1m between the units to prevent howling.
The recommended speaking distance for people to
speak to the microphone is between 20 and 40 cm.
6.4. Microphones
6.4.1. Introduction
The D-Cerno microphone has a unidirectional
response for optimum performance even in noisy
conditions, and has a very low susceptibility to
interference from mobile phones.
6.4.2. Electrical and
acoustic properties
Table 6.4.2: Microphone characteristics
Transducer type
Back electret (condenser)
Operating principle
Pressure gradient
Polar pattern
Unidirectional,
cardioid
Frequency response
130 Hz – 150000 Hz
Nominal impedance
1kOhm (at 1 kHz, drop resistance =
1k2, Vdd = 3.3VDC )
Load impedance
> 5kOhm
Max. SPL at 1 kHz
120 dB SPL
Free field sensitivity
7mV/Pa, +/- 3 dB at 1 kHz or
(-43dB, 0dB=1V/Pa at 1kHz)
Power supply
3.3V DC, 0.5 mA
Consumption
0.5 mA (without LED ring);
max. 25 mA (with illuminated ring)