Title:
高調波抑制回路
Document Type and Number:
Japanese Patent JP4813189
Kind Code:
B2
Abstract:
There are included an LPF (3) and an HPF (4) that are connected in parallel to the output of a pre-emphasis circuit (2). There is also included a gain adjusting circuit (6) that performs a gain adjustment of low-pass filter with respect to the frequency band to be passed through the HPF (4). The low frequency components of the frequency band of baseband signals outputted from the pre-emphasis circuit (2) pass through the LPF (3), while the high frequency components pass through the HPF (4). As to the outputs from the HPF (4), the gain of especially the higher part of the frequency band components to be passed through the HPF (4) is suppressed by the gain adjusting circuit (6), whereby the amplitudes of the baseband signals can be limited only for the high frequency range without using a limiter and further the peak values of the baseband signals can be inhibited from exceeding the maximum frequency deviation.
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Inventors:
Takeshi Ikeda
Hiroshi Miyagi
Hiroshi Miyagi
Application Number:
JP2006013434A
Publication Date:
November 09, 2011
Filing Date:
January 23, 2006
Export Citation:
Assignee:
株式会社リコー
International Classes:
H03G5/16; H04B1/04
Domestic Patent References:
| JP11068590A | ||||
| JP7327056A | ||||
| JP58103015A |
Attorney, Agent or Firm:
Tamio Nishiwaki