Title:
DIGITAL TONE CONTROLLER
Document Type and Number:
Japanese Patent JP3206271
Kind Code:
B2
Abstract:
PURPOSE: To implement proper amplification control free from digital clipping by minimizing the reduction of a dynamic range in digital tone control.
CONSTITUTION: Attenuators 10a, 10b attenuate an input signal by a prescribed value and tone filters 11a, 11b amplify a level of the input signal at a specific frequency band. The digital audio signal after the end of amplification is fed to a level discrimination section 12, and an amplified quantity calculation section 13 increases/decreases a variable K by multiplying a constant A being less than 1 or a positive constant B being 1 or over with the variable K based on the result of level discrimination. In this case, the controller is provided with a control means that limits the coefficient K within a range of a maximum value Kmax or below and a minimum value Kmin or over, and part of a coefficient of the tone filters is changed by the variable K to adjust the amplified quantity.
Inventors:
Development Yuji
Shunichi Chiba
Katsushi Yamada
Shunichi Chiba
Katsushi Yamada
Application Number:
JP921494A
Publication Date:
September 10, 2001
Filing Date:
January 31, 1994
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H03G3/20; H03G3/30; H03G5/02; H03G5/16; H03H17/00; H03H17/02; H03H17/04; (IPC1-7): H03G3/20; H03G3/30; H03G5/02; H03G5/16
Domestic Patent References:
| JP6295009A | ||||
| JP7221575A | ||||
| JP6291011A | ||||
| JP6295008A |
Attorney, Agent or Firm:
Fumio Iwahashi (2 others)