| 摘要 |
<p>The electronic stethoscope incorporates one or more electronic amplifier circuits. In the amplifier circuit there are one or more electronic filters (P1/C3) which are designed for suppressing extraneous noise. A special filter can be provided for this noise when of low or high frequency, and there can be a high-pass filter at the amplifier input (6). This filter consists of a resistor or and a capacitor assembly. This capacitor assembly of two or more capacitances of different values, which can be cut in alternately.</p> |
