Predetermined Center Frequency Selector (e.g., Push-button Control) Patents (Class 334/29)
  • Sound quality adjustment circuit
    Patent number: 6141425
    Abstract: A sound quality adjustment circuit including a status variable type active band-pass filter having an amplification circuit fed with an input signal and an integration circuit, and a controller for controlling the conversion conductance of the amplification circuit. The center frequency of the status variable type active band-pass filter is continuously varied by controlling the conversion conductance of the amplification circuit by the controller.
    Type: Grant
    Filed: September 19, 1997
    Date of Patent: October 31, 2000
    Assignee: Sony Corporation
    Inventors: Kazuo Murayama, Toshiya Murakami