符合ITU-T Rec.P51的 GRAS 44AB 嘴模拟器

ITU-T rec.: P.51
IEEE standards: 269, 661

GRAS 44AB嘴模拟器是一种近距离模拟人体口腔周围声场的声源，符合标准IEEE 269、661和ITU-T Rec.P51。GRAS 44AB用于测试电话接口以及其他类似通信中使用的传声器。

Technology

GRAS 44AB and 44AB-1

At the mouth reference point (MRP), which is 25 mm from the detachable lip ring (35 mm from the mouth of the Type 44AB/AB-1), the maximum continuous signal it can produce in ⅓-octave bands is 100 dB re. 20 µPa in the frequency range of 100 Hz to 16 kHz. Its loudspeaker accepts an external signal directly via a BNC input.

Jigs are included for calibration according to CCITT P.51 and 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″).

NOTE: This type of mouth simulator can not be mounted inside a KEMAR head.

Specifications

ITU-T recommondations
P.51
Connector type
BNC
IEEE standard
269, 661
Maximum power, continuous
W
10
Maximum power, pulsed 2 sec.
W
50
Temperature range, operation
°C / °F
10 to 35 / 50 to 95
CE/RoHS compliant/WEEE registered
Yes/Yes/Yes
Weight
g / oz
1000 / 35.274

Maximum continuous output level at MRP [200 Hz - 6 kHz] 110 dB re. 20 μPa

Maximum continuous output level at MRP [100 Hz - 16 kHz] 100 dB re. 20 μPa

Distortion 250 Hz - 8 kHz (Linear signal @ 94 dB at MRP) typically 1 %, max. 1.5 %

Frequency response

GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

Ordering info

Included

GRAS RA0104

Jig (CCITT P51)

GRAS RA0105

Jig (IEEE 269)

 

Optional

GRAS RA0110

Conical mouthpiece

GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.