| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a digital sound output device where performance can easily be maintained and safety is kept under suppression of a cost increase. <P>SOLUTION: Output of an ADC circuit 2 converting an input analog signal into a binary digital signal is transmitted to a driver circuit 3 by a photocoupler 16. An H-type bridge circuit 4 is operated by the power source of a single power source system formed of a power source transformer 9, a rectifier circuit 8, a capacitor 7, and resistors R1 and R2. Thus, DC potential which appears in the terminal of a speaker 6 becoming a load is kept to be same as that of a cabinet, destruction by a ground fault is prevented, high performance is maintained and the cost increase is suppressed in an H bridge-type D class power amplification system. <P>COPYRIGHT: (C)2004,JPO</p> |
