Comb filter

Details Comb filter Comb filter

1981-06-12

1985-01-08

Mullins, James B.

Amplifiers

With plural amplifier channels

Amplifying different frequencies in different channels

330174, 330306, 307520, 328167, 333142, H03F 368, H04B 1100

Patent

active

044929285

ABSTRACT:
Comb filter having a comb like band pass characteristic curve by using an ultrasonic delay line (9) is improved to reduce its size. An input signal is given through an impedance element 13 to a single terminal 10a of an improved delay line 9, wherein the single terminal serves as the input terminal and at the same time as the output terminal. Signals at both ends of the impedance element 13 are given to a mixing circuit 15 for summing or subtracting thereby. In the improved delay line 9, the ultrasonic wave radiated from the input terminal travels twice the conventional delay line and comes back to the original terminal, and thereby a sufficient propagation distance is obtainable in a small delay line.

REFERENCES:
patent: 2839731 (1958-06-01), McSkimin et al.
patent: 4350956 (1982-09-01), Depuy

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