Type 44AA


Type 44AA
The Mouth Simulator Type 44AA 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 44AA 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 44AA), 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 either directly or via its own built-in power amplifier (when power is applied).

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 44AA
Min. continuous output level at MRP: 110dB re. 20µPa
(200Hz - 6kHz)
Loudspeaker: 8 Ohm x 20W
(max. continuous)
Amplifier: gain: 10dB
input impedance: 20kOhm
Mouth opening: 20mm diameter
Lip ring: external diameter: 48mm
distance from mouth: 10mm
Dimensions: diameter: 104mm
height (with lip ring): 104mm
Weight: 1.3kg
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