US3907412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film projector with sound
Assignee: ERNST PLANK KG
•
Filing: 1974-10-29
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Granted: 1975-09-23
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Expires: 1994-10-29
Abstract
Abstract A film projector is provided with means for simultaneous playback of at least two sound tracks whereby the volume or intensity of one of the sound tracks is applied to control the volume or intensity of the other sound track without causing partial or complete erasure of the recorded sound. The volume or intensity of one of the sound tracks may be varied inversely to the volume of the other sound track thereby permitting two separate acoustical information patterns recorded on the tracks to be simultaneously heard while one or the other of the tracks is softened or decreased in volume intensity when the concurrently played track is to have its volume heightened.
Inventors
- 👤 Hans Achim Schaller
- 👤 Gunter Reinhardt
- 👤 Dieter Zenger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:28
CPC Classifications
G; G03; G03B; G03B31/00; G03B31/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 words
In a projector assembly for projecting a visual filmed image and simultaneously reproducing sound recorded on sound track means, the improvement comprising means for simultaneously reproducing at least two separate acoustical information patterns recorded on at least two separate sound tracks, means for amplifying said at least two information patterns, and means for controlling the volume level at which one of said at least two information patterns is reproduced in dependence upon the volume level at which said other of said patterns is reproduced while said patterns are being simultaneously reproduced by said projector apparatus.
Claim 2
Dependent Claim
95 words
In a projector assembly for projecting a visual filmed image and simultaneously reproducing sound recorded on sound track means, the improvement comprising means for simultaneously reproducing at least two separate acoustical information patterns recorded on at least two separate sound tracks, means for amplifying said at least two information patterns, and means for controlling the volume level at which one of said at least two information patterns is reproduced in dependence upon the volume level at which said other of said patterns is reproduced while said patterns are being simultaneously reproduced by said projector apparatus.
Claim 3
Dependent Claim
35 words
An assembly according to claim 1 wherein said volume level controlling means operate to alter the volume level of said one information pattern inversely to changes in volume level occuring in said other information pattern.
Claim 4
Dependent Claim
65 words
An assembly according to claim 1 wherein said projector is provided with a sound tape device including sound tape having thereon an acoustical information pattern, said projector being adapted to project said visible filmed image by movement through said projector of a film strip, with the movement of said film strip being syncronized with the movement of the sound tape of said sound tape device.
Claim 5
Dependent Claim
40 words
An assembly according to claim 3 wherein said sound tape device is a cassette device which is built into said projector, said projector including drive means operable to simultaneously drive said projector and said cassette device through resilient intermediate elements.
Claim 6
Dependent Claim
69 words
An assembly according to claim 1 wherein said projector is adapted to project said visual filmed image from a film strip passing therethrough, wherein two sound tracks are applied laterally along said film strip and wherein said projector is provided with means for magnetic track recording at the edges of said film strip and with means for playback which are adapted to conform to the sound tracks thus recorded.
Claim 7
Dependent Claim
63 words
An assembly according to claim 1 wherein each of said acoustical information patterns is applied to a preamplifier, with one of said information patterns operating as a controlling pattern and with the other of said information patterns being a controlled pattern, said assembly further including a control connection extending from the preamplifier of said controlling pattern to the preamplifier of said controlled pattern.
Claim 8
Dependent Claim
37 words
An assembly according to claim 6 including a pair of amplifiers each arranged to receive, respectively, a signal from each of said preamplifiers and a common speaker connected to receive signals simultaneously from both of said amplifiers.
Claim 9
Dependent Claim
33 words
An assembly according to claim 1 wherein the information pattern of one of said sound tracks is influenced with respect to its intensity by control signals from the other of said sound tracks.
Claim 10
Dependent Claim
22 words
An assembly according to claim 8 wherein the controlling information pattern comprises a frequency which is outside of the utilized transmission range.
Claim 11
Dependent Claim
32 words
An assembly according to claim 9 including a microphone and an operating member adaptable to effect actuation of said microphone wherein the controlling sound is set by means of said operating member.
Claim 12
Dependent Claim
69 words
An assembly according to claim 10 including a main amplifier adapted to receive said controlled sound pattern, and a control circuit adapted to have applied thereto said controlling sound pattern, said control circuit including a selective amplifier, a threshold stage connected to said selective amplifier and an attenuation member controlled by said threshold stage, said attenuation member being connected to control said main amplifier of said controlled sound pattern.
Claim 13
Dependent Claim
74 words
An assembly according to claim 11 wherein said projector is assembled as a unitary member having built thereinto said preamplifiers, said amplifiers, said selective amplifier, said threshold stage, said attenuation member and speaker means all connected with each other and wherein said projector further includes sound heads including sound recording means as well as playback means, said assembly being arranged to have sound tracks operatively passed therethrough in operative association with said sound heads.
References Cited (Backward Citations)
US1989963A
Cited
US3049965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |