Type 44AB

Type 44AB
The Mouth Simulator Type 44AB is a sound source which simulates the sound field around the human mouth at close quarters and complies with the Standards IEEE 269, 661 and ITU-T Rec. P51.

The Type 44AB is for testing telephone mouthpieces as well as other microphones similarly used in communication networks. At the mouth reference point (MRP), which is 25mm from the detachable lip ring (35mm from the mouth of the Type 44AB), the minimum-continuous signal it can produce in 1/3-octave bands is 100dB re. 20µPa in the frequency range 100Hz to 16kHz. Its loudspeaker accepts an external signal directly via a BNC input.

Jigs are included for calibration according to CCITT P.51 and Fpr IEEE 269. These are for use with ¼" or ½" microphones. One jig holds the microphone at 0º incidence (¼" only) to the sound source, the other at 90º incidence (¼" or ½").

Specifications Type 44AB
Min. continuous output level at MRP: 110dB re. 20µPa
(200Hz - 6kHz)
Loudspeaker: 8 Ohm x 20W
(max. continuous)
Mouth opening: 20 mm diameter
Lip ring: external diameter: 48 mm
distance from mouth: 10 mm
Dimensions: diameter: 104 mm
  height (with lip ring): 104 mm
Weight: 0.93 kg
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