二手，丹麦B&K TYPE4227仿真嘴

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B&K4227 人工耳的特点如下：

• 符合IEEE-269, IEEE-661和ITU-T P.51标准要求
• 将Brüel & Kjær ½英寸传声器置于校准夹上，就可以得到准确的声压级和频率响应校正
• 精确模拟人类语音声场
• 电话传输器和近讲传声器的频率响应和失真测试的高质量控制
• 25毫米唇圈提供连续100dB的声压级
• 低失真
• 内置过载保护电路

• Applications：

  • Mouth Simulator Type
    4227 has been developed for use in the testing of telephone transmitters and
    other microphones where a sound field similar to the human voice field is
    required.

  • Type 4227 produces a
    guaranteed minimum continuous output of 110 dBSPL (200 Hz to 2 kHz) at a
    distance of 25 mm from the lip ring. A sound pressure level of more than 120 dB
    is possible with pulsed operation. A built-in overload protection circuit
    minimizes the risk of accidental damage to the loudspeaker.

  Specifications：

  • Continuous SPL of
    110 dB at 25mm from lip ring

  • Low
    distortion

  • Built-in overload
    protection circuit

  • Optional
    regulating microphone for very accurate frequency response control

  • Conforms to
    Standards: IEEE269, 661 and ITU-T