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Audio Signal Processing

Frequency-characteristic-adjusting-circuit

Automatic electrical power control circuit

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FIG. 1 shows a portion 100 of an illustrative enhanced National Television System Committee (NTSC) ...

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Spectrum shaping microwave digital modulators

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PSK modulator with noncollapsable output for use with a PLL power amplifier

The present invention pertains to a PSK modulator for use with either wideband power amplifier up ...

Spectrally efficient digital modulation method and apparatus

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Frequency characteristic adjusting circuit

Details

Inventors: Ishikawa, Kazumasa; Takahashi, Shin-ichi; Yoneyama, Masahide;
Assignee: Nippon Columbia Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Mullins; James B.
Assistant Examiner:
Attorney, Agent or Firm:

In a frequency characteristic adjusting circuit having an arrangement of at least one adder, a filter circuit and feedback and/or feed forward means the transfer factors of which and the peak or dip of the filter circuit are freely selectable. Adjustment of the center frequency and Q are independent.

DETAILED DESCRIPTION An object of this invention is to provide a simple-structured frequency characteristic adjusting circuit.
Another object of this invention is to provide a frequency characteristic adjusting circuit which is capable of easy adjustment of phase center frequency and amplification degree.
Another object of this invention is to provide a frequency characteristic adjusting circuit which permits easy selection of a peak or dip caused in the frequency characteristic.
Another object of this invention is to provide a frequency characteristic adjusting circuit which has a band-pass or band-eliminate characteristic having different amplification degrees in low- and high-frequency ranges.
Another object of this invention is to provide a frequency characteristic adjusting circuit which has a desired number of peaks or dips.
Yet another object of this invention is to provide a frequency characteristic adjusting circuit which has a second-order type transfer function.

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