B&K 4153型仿真耳（ITU-T P.57 Type 1）
符合IEC 60318-1的4.2cc耦合腔，用于听力计和受话器的电声测量，声阻抗符合人耳真实阻抗。使用时需配备4192型1/2英寸压力场传声器和2669型前置放大器
4153 - 型人工耳/仿真耳（IEC 60 318耦合腔，不含传声器及前置放大器）
人工耳4152和4153是专为声学测量及相关领域而设计。插入耳机或头戴式耳机电声测量都可在良好的声学条件下进行的，这对于不同设计的相似性和重复性测量是非常重要的。这两款人工耳主要耦合器不同，其它功能都是相似的。
功能：
1.测量插入式耳机和耳机的频率响应和灵敏度
2.校准听力计
特点：
1.符合IEC和ANSI标准
2.良好的测量条件
3.2立方厘米和6立方厘米耦合器
4.夹紧力可调
'USES:
• Frequency response and sensitivity measurements
on insert earphones and headphones
• Calibration of audiometers
FEATURES:
• Conform to IEC and ANSI standards
• Complete reproducibility of results
• Well-defined measuring conditions
• 2 cm 3 and 6 cm 3 couplers
• Adjustable clamping force
Artificial Ear Type 4153
Artificial Ear Type 4153 fulfils the requirements of IEC 318 and has an acoustical impedance basically similar to that of the human ear. The acoustic coupler (Fig. 3) contains three volumes ( V 1 = 2.5 cm 3 , V 2 = 1.8 cm 3 and V 3 = 7.5 cm 3 ) acoustically connected in parallel by means of a narrow annular slit and four parallel holes. The slit and the four holes act as an acoustic resistance of 6.5 × 10 6 Ns/m 5 and 20 × 10 6 Ns/m 5 respectively, while their acoustic in-ductances are 5 × 10 2 Ns 2 /m 5 for the slit and 10 4 Ns 2 /m 5 for the holes. An electrical equivalent of the acoustic circuit is shown in Fig. 4.
The coupler fits Brüel & Kjær Falcon? Range 1 / 2 ″ Microphone Type 4192, and may be used with a Falcon Range Microphone Preamplifier Type 2669 L mounted in the housing. The coupler also mounts directly on the preamplifiers by means of the Adaptor Ring DB 0742 supplied. The coupler is shaped to fit the head-phone under test, and a special Adaptor DB 0843 is supplied for testing circumaural headphones.
