Title:
固定された位相応答を有するデジタル等化フィルタ
Document Type and Number:
Japanese Patent JP5486665
Kind Code:
B2
Abstract:
An equalization filter structure for filtering an audio signal within an audio system is disclosed. The equalization filter comprises a first and a second shelving filter each having a fixed first and a fixed second phase response, each of which is determined by a respective cut-off frequency and Q factor which represent the transfer characteristic of the corresponding shelving filter. The first and the second shelving filters are coupled in series and each shelving filter comprises at least one fourth order low-pass filter having a cut-off frequency, a Q factor, and a first broadband gain and further at least one fourth order high-pass filter having a second broadband gain and the same cut-off frequency and the same Q factor as the low-pass filter. The fourth order low-pass filter and the fourth order high-pass filter are connected in parallel, such that both filters receive the same input signal and the corresponding filtered signals are summed to form a respective shelving filter output signal. Each fourth order low-pass and high-pass filter is composed of a cascade of two second order low-pass or high-pass filters, respectively, and each second order filter has the same cut-off frequency and Q factor as the corresponding shelving filter.
Inventors:
Marx Christoph
Application Number:
JP2012272772A
Publication Date:
May 07, 2014
Filing Date:
December 13, 2012
Export Citation:
Assignee:
Herman Becker Automotive Systems GM Behr
International Classes:
H03G5/02; H04R3/04; H04S5/02
Domestic Patent References:
| JP9167944A | ||||
| JP2009212989A | ||||
| JP2007500466A | ||||
| JP2005229589A |
Attorney, Agent or Firm:
Hidesaku Yamamoto
Natsuki Morishita
Natsuki Morishita