US3587006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for producing artificial reverberation comprising frequency dividing means
Assignee: AKG Acoustics GmbH
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Filing: 1968-12-03
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Granted: 1971-06-22
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Expires: 1988-12-03
Abstract
Abstract An artificial reverberation arrangement includes first and second transmission lines. Each transmission line includes a helical spring, adapted to transmit torsional vibrations at frequencies up to a predetermined limiting frequency, an actuating transducer connected to one end of the spring and a pickup transducer connected to the opposite end of the spring. The spring of the first transmission line is longer, and has a longer transit time and a lower limiting frequency, than the spring of the second transmission line. The actuating transducers are operable to impart torsional vibrations to the associated springs, and the pickup transducers are operable to convert torsional vibrations of the respective springs and to electric oscillations. The arrangement includes frequency dividing means operable to suppress transmissions above a predetermined division frequency through the first transmission line, and to suppress transmission at frequencies below the predetermined division frequency through the second transmission line.
Inventors
- 👤 Bernhard Weingartner
- 👤 Werner Fidi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:40
CPC Classifications
G; G10; G10K; G10K15/00; G10K15/08; G10K15/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
179 words
An arrangement for producing artificial reverberation comprising, in combination, first and second helical springs each adapted to transmit torsional vibration at frequencies up to a respective predetermined limiting frequency, said first spring being longer, and having a longer transit time and a lower limiting frequency, than said second spring; first and second actuating transducers connected to said first and second springs, respectively, and operable to impart torsional vibration to the associated springs; first and second pickup transducers connected to said first and second springs, respectively, and operable to convert torsional vibration of the associated springs into electric oscillations; said first actuating transducer, first spring and first pickup transducer constituting a first transmission line; said second actuating transducer, second spring, and second pickup transducer constituting a second transmission line; and frequency dividing means connected to said transducers suppressing transmission, at frequencies above a predetermined division frequency, by said first transmission line and suppressing transmission, at frequencies below said predetermined division frequency, by said second transmission line; said division frequency being substantially equal to the limiting frequency of said first spring.
Claim 2
Dependent Claim
179 words
An arrangement for producing artificial reverberation comprising, in combination, first and second helical springs each adapted to transmit torsional vibration at frequencies up to a respective predetermined limiting frequency, said first spring being longer, and having a longer transit time and a lower limiting frequency, than said second spring; first and second actuating transducers connected to said first and second springs, respectively, and operable to impart torsional vibration to the associated springs; first and second pickup transducers connected to said first and second springs, respectively, and operable to convert torsional vibration of the associated springs into electric oscillations; said first actuating transducer, first spring and first pickup transducer constituting a first transmission line; said second actuating transducer, second spring, and second pickup transducer constituting a second transmission line; and frequency dividing means connected to said transducers suppressing transmission, at frequencies above a predetermined division frequency, by said first transmission line and suppressing transmission, at frequencies below said predetermined division frequency, by said second transmission line; said division frequency being substantially equal to the limiting frequency of said first spring.
Claim 3
Dependent Claim
18 words
An arrangement for producing artificial reverberation, as claimed in claim 1, in which said transducers comprise electrodynamic transducers.
Claim 4
Dependent Claim
22 words
An arrangement for producing artificial reverberation, as claimed in claim 1, in which said frequency dividing means comprise mechanical frequency dividing means.
Claim 5
Dependent Claim
22 words
An arrangement for producing artificial reverberation, as claimed in claim 1, in which said frequency dividing means comprise electric frequency dividing means.
Claim 6
Dependent Claim
24 words
An arrangement for producing artificial reverberation, as claimed in claim 1, in which said frequency dividing means comprise mechanical and electric frequency dividing means.
Claim 7
Dependent Claim
34 words
An arrangement for producing artificial reverberation, as claimed in claim 1, in which said frequency dividing means transmit frequencies within a predetermined range; said division frequency being approximately in the middle of said range.
Claim 8
Dependent Claim
103 words
An arrangement for producing artificial reverberation, as claimed in claim 1, in which said actuating transducers and said pickup transducers are connected to the associated springs near first and second ends, respectively, of the associated springs; respective suspending means suspending said springs at said first and second ends thereof; the suspending means at one end of said first spring having a small damping effect for torsional vibration and being stiff and having a large damping effect for compressional vibration; at least one of the suspending means for said second spring suppressing torsional vibration of said second spring at frequencies below said division frequency.
Claim 9
Dependent Claim
73 words
An arrangement for producing artificial reverberation, as claimed in claim 9, in which said transducers are electrodynamic transducers; the suspending means at the first end of said second spring comprising a piece of wire which is sOft in torsional vibration and presents a high resistance to compressional vibration; at least one of the suspending means connected to said second spring comprising a short stiff piece of wire extending axially of said second spring.
Claim 10
Dependent Claim
39 words
An arrangement for producing artificial reverberation, as claimed in claim 8, in which said transducers comprise rotary magnets; the rotary magnet of at least one of said second transducers being embedded in foam material adapted to suppress compressional vibration.
Claim 11
Dependent Claim
34 words
An arrangement for producing artificial reverberation, as claimed in claim 9, in which the rotary magnet of at least one of said first transducers is embedded in foam material adapted to suppress compressional vibration.
Claim 12
Dependent Claim
33 words
An arrangement for producing artificial reverberation, as claimed in claim 1, in which said frequency dividing means comprises first and second electric filter means connected in said first and second transmission lines, respectively.
Claim 13
Dependent Claim
32 words
An arrangement for producing artificial reverberation, as claimed in claim 11, in which each of said electric filter means includes a filter element preceding the actuating transducer of the respective transmission line.
Claim 14
Dependent Claim
32 words
An arrangement for producing artificial reverberation, as claimed in claim 11, in which each of said electric filter means includes a filter element succeeding the pickup transducer of the respective transmission line.
Claim 15
Dependent Claim
42 words
An arrangement for producing artificial reverberation, as claimed in claim 11, in which each of said electric filter means includes a filter element which precedes the actuating transducer and a filter element which succeeds the pickup transducer of the respective transmission line.
Claim 16
Dependent Claim
39 words
An arrangement for producing artificial reverberation, as claimed in claim 11, in which said second filter means, in said second transmission line, includes a high pass filter having a limiting frequency which is approximately equal to said division frequency.
Claim 17
Dependent Claim
40 words
An arrangement for producing artificial reverberation, as claimed in claim 11, in which said second filter means, in said second transmission line, suppresses transmission of frequencies outside the range defined between the limiting frequencies of said first and second springs.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |