Channel divider

Abstract

Abstract PURPOSE:To ensure an optional setting of the filter characteristics such as the filter type, the degree, the cut-off frequency and the like by using a microprocessor, at the same time securing an automatic correction for the shift of the frequency characteristics of the filter. CONSTITUTION:The 3-way system plus the type of each filter, the cut-off frequency and the degree are designated by the preset key 24. Then the data of these setting conditions are supplied to the microprocessor MPU21. The MPU21 gives an operation to each element value of the LPF4 and 11 plus the HPF5 and 6 based on the logic equation of the filter, and then delivers the result of operation to said LPFs and HPFs in the form of the element value switch signal. After this, the control signals are delivered to the switches 2 plus 7-10, and then a connection is secured between the terminal (b) and the common terminal (c) of the switch 2 as well as between each terminal (d) of switches 7-10 and the common terminal (e). Then the checking and correction is given to the characteristics of each filter. And the application becomes possible when the checking and correction is over with a connection secured between the terminals (a) and (c) of the switch 2 by the control signal supplied from the MPU21.

Inventors

• 👤 Takao Takehara

Bibliographic Details