Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1975-02-18
1976-03-16
Eddleman, Alfred H.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
179 1GQ, 333 6, 333 70R, G11B 374, H03H 506
Patent
active
039447553
ABSTRACT:
A composite filter circuit comprises a first series resonant circuit connected to a single common resistor, resonating at a first frequency, and exhibiting a low-pass filtering characteristic. A parallel resonant circuit includes one circuit element of the first series resonant circuit and resonates at a second frequency. A second series resonant circuit is connected to the single common resistor, resonating at the second frequency, and exhibiting a highpass filtering characteristic. The first series resonant circuit and the parallel resonant circuit constitute a low-pass filter circuit section. This low-pass filtering characteristic results from the total effects of the low-pass filtering characteristic of the first series resonant circuit, a dip characteristic of the parallel resonant circuit, and, in addition, a decreasing characteristic at the second frequency, due to the second series resonant circuit. The second series resonant circuit constitutes a high-pass or band-pass filter circuit section having a high-pass filtering characteristic resulting from the total effect of the high-pass filtering characteristic of the second series resonant circuit and, in addition, the decreasing characteristic at the first frequency due to the first series resonant circuit.
REFERENCES:
patent: 3201716 (1965-08-01), Giger
patent: 3325753 (1967-06-01), Shearer
patent: 3358246 (1967-12-01), Bensasson
patent: 3843850 (1974-10-01), Takahashi
Itoh Yasuo
Kasuga Masao
Takahashi Nobuaki
Eddleman Alfred H.
Lucas Jay. P.
Victor Company of Japan Ltd.
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