| 摘要 |
PCT No. PCT/DE90/00853 Sec. 371 Date Apr. 27, 1992 Sec. 102(e) Date Apr. 27, 1992 PCT Filed Nov. 10, 1990 PCT Pub. No. WO91/09399 PCT Pub. Date Jun. 27, 1991.In a circuit arrangement for the operation of a light source for the optical scanning of recording media, in particular so-called compact discs, from an information signal obtained by the scanning a signal (quality signal) is derived which describes the quality of the information signal. The power of the light source is controlled in dependence on the quality signal with the aim of maximising quality. |
