| 摘要 |
PURPOSE:To uniform the frequency characteristic by using a control microcomputer so as to discriminate a sub code of a compact disk detected by a digital signal processing unit and giving a de-emphasis coefficient to the processing unit. CONSTITUTION:In the compact disk CD mode, when a sub code input from a digital signal processing unit DSP 10 exists, a sub code of channel Q is fetched. For example, the playing time is displayed on a display device 7 to discriminate a control section of the Q code. Then the coefficient in response to the presence of a pre-emphasis is outputted to the unit DSP 10. The de- emphasis circuit in the unit DSP 10 is in common use for the tuners 1, 2 as the sound source. Thus, a CPU 4 discriminates the mode and transfers a filter coefficient in response to the mode to the unit DSP 10. Thus, since the de- emphasis circuit for the CD player is constituted in the unit DSP 10, the characteristic is uniformed. |
