Harmonic suppressing circuit

Details Harmonic suppressing circuit Harmonic suppressing circuit

2011-05-17

2011-05-17

Lee, Benny (Department: 2817)

Wave transmission lines and networks

Automatically controlled systems

Limiting of amplitude

C333S014000, C381S061000, C381S098000, C381S094200, C455S114100, C455S114200

Reexamination Certificate

active

07944321

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.

REFERENCES:
patent: 4281295 (1981-07-01), Nishimura et al.
patent: 4427950 (1984-01-01), Akagiri et al.
patent: 4471318 (1984-09-01), Akagiri
patent: 5220427 (1993-06-01), Mikami
patent: 2004/0161114 (2004-08-01), Koyanagi
patent: 51-042748 (1976-10-01), None
patent: 59-021136 (1984-02-01), None
patent: 11-068590 (1999-03-01), None

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