| 摘要 |
PURPOSE:To obtain the single characteristics of each digital filter so as to obtain the coincidence between the level of the frequency band of each digital filter and the target level and then to set the coefficient of each digital filter in order to realize said single characteristics of these digital filters. CONSTITUTION:The digital signal of an audio signal, etc. converted into a PCM is supplied to a digital signal processing unit DSP2 via an input terminal 1. Then the digital signal is processed by the DSP2 and then delivered through an output terminal 3. An RAM4 and a memory control unit MCU5 are provided to assist the digital signal processing of the DSP2 and especially to delay the digital signal without giving load to the DSP2. Furthermore a host CPU6 is added to control operations of the DSP2 and the MCU5 as well as to set the data of various types of coefficients. With such a hardware constitution, the digital signal processing procedure is controlled with the program software. In such a way, a graphic equalizer of multi-stage filter constitutions 11-18 is realized. |
