| 摘要 |
PROBLEM TO BE SOLVED: To provide an audio adder circuit for preventing a non-audio digital signal from being mixed into an audio digital signal. SOLUTION: A first digital input signal 1-1 is converted to a linear encoded digital signal and inputted to a digital signal identifier 16. When this linear encoded digital signal is identified as a non-audio digital signal by the digital signal identifier 16, a non-audio digital signal is generated by inserting an idle pattern to this linear encoded digital signal by a non-audio digital signal inserter 18, and this non-audio digital signal is sent to digital adders 14-2 and 14-3. In the digital adder 14-2, digital addition is applied to the non-audio digital signal and the linear encoded digital signal from a linear encoding converter 10-3 and in the digital adder 14-3, digital addition is applied to the non-audio digital signal and the linear encoded digital signal from a linear encoding converter 10-2. |
