| 摘要 |
<p>PURPOSE:To optimumly measure both an electric musical instrument and a nonelectric musical instrument by providing a control circuit by which when the second switch is 'open', the number of samples for averaging of an averaging circuit becomes (n), and when said switch is 'close', the number of samples for averaging of the averaging circuit becomes (m)not equal to (n). CONSTITUTION:When a plug connected to an electric musical instrument is inserted into an input circuit 1, an electric signal of the electric musical instrument is inputted to a pitch extracting circuit 3, and a second switch SW2 goes to, for instance, 'open', and this 'open' information is inputted to a control circuit 4 and controlled so that the number of samples for averaging becomes 'n'. On the other hand, when the plug connected to the electric musical instrument is not inserted into the input circuit 1, a signal of a built-in microphone 2 is inputted to the pitch extracting circuit 3, and also, the second switch SW2 becomes, for instance, 'close', and this 'close' information is inputted to the control circuit 4 and controlled so that the number of samples for averaging becomes (m)not equal to (n).</p> |
