TYPE4602B TELEPHONE TEST HEAD
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: IEEEand ITU-T