| 摘要 |
PURPOSE: To improve a noise characteristic by generating plural synthesis control signals with the prescribed relation of balance and a sound volume and decoding them and applying them to switching elements. CONSTITUTION: An L channel array 350 and an R channel array 351 contain plural switching elements 311-316 and 317-322. One of the elements 311-316 and 317-322 is selectively turned on at arbitrary time and a signal route is formed. At that time, the resistors become a voltage divider and it outputs a decided signal level. A balance operation part 326 outputs a balance signal with the operation of a user and a sound volume operation part 327 outputs a sound volume signal. An operation signal synthesis part 325 inputs the sound volume signals which the operation parts 326 and 327 outputs and outputs an L/R channel synthesis control signal in accordance with the prescribed relation of balance and the sound volume. The signals are decoded in decoders 323 and 324 and they are applied to the elements 311-322. Then, the sound volume and balance are independently operated and the noise characteristic improves. |
