1. Introductions

           AM3000 type artificial mouth can simulate the sound field produced by human mouth accurately in the near field.It is specially used for the detection of acoustic characteristics of microphone channels in transmission and communication products such as telephones, mobile phones and electroacoustic components. AM3000 meets the requirements of IEEE269, ITU-T, Rec.P51 and other international standards. In order to provide a precise standard sound source, accurately simulate the characteristics of human speech sound, AM3000 has a built-in high performance speaker driving unit, the driving unit is mounted in a special acoustic approximately closed and can advanced simulate the human mouth average acoustic characteristics, including some parameters such as acoustic damping coefficient, radiation characteristics and transmission characteristics. Therefore, AM3000 can provide a stable, broadband response and low distortion standard sound source.

Fig 1 Frequency response curve of AM3000 at 1V (0.25W) without equalization

Fig 2 Frequency response of AM3000 at 25mm distance

at 1V (0.25W) with equalization

Fig 3 THD curve of AM3000 at 1V (0.25W) without equalization

2. Characteristics and Uses

    ◆   Sound source for acoustic measurements

    ◆   Measuring the frequency response and distortion of telephone transmitters and communication microphones

    ◆   Human voice accurate simulation

    ◆   Minimum-continuous SPL of 110dB

    ◆   Low distortion and high stability

    ◆   Wide frequency response 100Hz-10kHz，can be extended to 15kHz

    ◆   Built-in overload protection circuit

    ◆  Complies with Standards: IEEE 269,661 and ITU-T Rec. P.51

3. Technical parameter

    ◆   Continuous output Level

                 Min. SPL of 110dB at 1V (0.25W), (25mm from lip ring)

    ◆   THD

                94dB SPL, At 25mm from lip ring

                200Hz-300Hz, Less than 2%

                300Hz-10kHz, Less than 1%

    ◆   Built-in Loudspeaker

                Max. Power    10W

                Rated Impedance    4ohm

                Diameter    88mm(4inch)

    ◆   Environmental Calibration Conditions

                Temperature    25±5℃

                Relative humidity    60±15%

                Barometric pressure    100±5 Pa

    ◆   Mouth sound hole

                Diameter    20mm

    ◆   Lip ling

                Position    10mm from mouthpiece

                Out diameter    47.5mm

    ◆   Dimensions

                Diameter×height    104mm*104mm

    ◆   Weight 

                2.2 Kg

       4.Applications

             AM3000 artificial mouth is widely used in the microphone tests, headphone tests, wireless audio device tests and the complete machine tests. In actual working process, AM3000 also needs to be used with PA3000 amplifier. At the same time, AM3000 can also carry out the headphone test with AE1000 (AE2000) and jig for HD300 headphone test jig.