Noise Reducing Microphone

The Noise-Reducing Microphone uses a sophisticated design to filter out background noise. It also filters out feedback commonly heard from paging systems. It is also known as the Confidencer microphone. Unlike standard microphones, which only have ports in the front, noise-canceling microphones have ports in the front and the rear. Since ambient noise enters the microphone from both ports, the same pressure is put on both sides of the diaphragm. Because the ambient noise doesn't cause the diaphragm to vibrate, it is not heard. Since speech is entering from only the front of the microphone, the diaphragm vibrates from only the speech, which means the background noise isn't heard. With a noise-reducing handset, the caller must speak directly into the microphone.

Electret-compatible Microphone Specifications:
- Sensitivity at 1 kHz: -42± 3 dBV
- Impedance at 1 kHz: 2 kohms ± 35% ohms
- Maximum Drain Current: 0.5 mA at 1.5 VDC
- Operating Voltage Range: 1.5 VDC
- Noise Cancellation: NLT 6 dB (300 Hz to 3.3 kHz)