| 摘要 |
<p>A PCM word decoder has a characteristic curve which is symmetrical with respect to zero abscissa point. Starting from the zero abscissa point, the curve comprises a linear part corresponding to the eight first codes, a logarithmic part corresponding to 40 following codes and a linear part corresponding to the 16 last codes. This is accomplished by two identical ladder attenuators and two sets of current generators. One attenuator and set of generators correspond to the logarithmic part, and the other to the linear part.</p> |
