Patent US3757058A successfully refreshed from Google Patents.
US3757058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Different between head transit times recording enhancement system using two tape playing device running at
Assignee: Individual
•
Filing: 1971-04-19
•
Granted: 1973-09-04
•
Expires: 1991-04-19
Abstract
Abstract A system for enhancing a magnetic tape master recording played back on an apparatus having first and second reproduce heads respectively spaced along the direction of tape travel. The playback output of the first reproduce head is recorded by a magnetic tape recording apparatus having a third reproduce head situated downstream of the record head and adapted to play back information just recorded. By adjusting the between head tape transit time in the recording apparatus to be slightly different from that of the master playback apparatus, and combining the playback outputs of the second and third reproduce heads, an enhanced version of the master recording is produced. The system also may be used to produce ''''quad'''' sound from a prerecorded two-channel stereophonic tape.
Inventors
- 👤 B Ingoldsby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:46
CPC Classifications
G; G11; G11B; G11B5/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
245 words
A system for enhancement of a master recording contained on a first magnetic tape, comprising: a playback apparatus for reproducing said master recording, said playback apparatus having first and second reproduce heads spaced in that order along the direction of tape travel, said second reproduce head providing a playback output identical to that from said first reproduce head but delayed therefrom by a duration equal to the between head transit time of said first magnetic tape, a separate magnetic tape recording apparatus employing a separate, second magnetic tape and having a record head and a second-tape reproduce head spaced respectively along the direction of travel of said second magnetIc tape, said record head simultaneously rerecording the playback output of said first reproduce head onto said second magnetic tape, said reproducing thereafter being played back as said second magnetic tape passes said second-tape reproduce head, the transit time of said second magnetic tape between said record head and said second-tape reproduce head being slightly different from the between-head transit time of said first magnetic tape, and means for combining the playback output of said first tape as recovered by said second reproduce head and the playback output of said second tape as recovered by said second-tape reproduce head to develop an enhanced version of said master recording, said enhanced version comprising copies of the original master recording mutually separated in time by the difference in between head transit times of the separate playback and recording apparatuses.
Claim 2
Independent Claim
245 words
A system for enhancement of a master recording contained on a first magnetic tape, comprising: a playback apparatus for reproducing said master recording, said playback apparatus having first and second reproduce heads spaced in that order along the direction of tape travel, said second reproduce head providing a playback output identical to that from said first reproduce head but delayed therefrom by a duration equal to the between head transit time of said first magnetic tape, a separate magnetic tape recording apparatus employing a separate, second magnetic tape and having a record head and a second-tape reproduce head spaced respectively along the direction of travel of said second magnetIc tape, said record head simultaneously rerecording the playback output of said first reproduce head onto said second magnetic tape, said reproducing thereafter being played back as said second magnetic tape passes said second-tape reproduce head, the transit time of said second magnetic tape between said record head and said second-tape reproduce head being slightly different from the between-head transit time of said first magnetic tape, and means for combining the playback output of said first tape as recovered by said second reproduce head and the playback output of said second tape as recovered by said second-tape reproduce head to develop an enhanced version of said master recording, said enhanced version comprising copies of the original master recording mutually separated in time by the difference in between head transit times of the separate playback and recording apparatuses.
Claim 3
Dependent Claim
29 words
A system as defined in claim 1 further comprising: speed control means associated with said recording apparatus for adjusting the between head transit time of said second magnetic tape.
Claim 4
Dependent Claim
30 words
A system as defined in claim 1 wherein said means for combining comprises apparatus for recording together on a system output tape said second and third reproduce head playback outputs.
Claim 5
Dependent Claim
21 words
A system as defined in claim 1 wherein said first reproduce head comprises a record head operated in the reproduce mode.
Claim 6
Dependent Claim
35 words
A system as defined in claim 1 wherein said second magnetic tape is endless, and further comprising tape erase means situated along the direction of tape travel between said reproduce head and said record head.
Claim 7
Independent Claim
200 words
A method of enhancing a master recording contained on a first magnetic tape, comprising the steps of: playing back said first magnetic tape on a playback apparatus having first and second reproduce heads spaced in that order along the direction of tape travel, said playback apparatus having a fixed between head transit time correspoNding to the speed at which said master was recorded on said first tape, simultaneously recording the playback output of said second reproduce head onto a second magnetic tape via the record head of a separate magnetic tape recording apparatus, said recording apparatus having a second-tape reproduce head spaced further along the direction of tape travel from said record head for playing back said simultaneous recording, playing back said second tape via said second-tape reproduce head during the same passage as that on which said second tape is recorded, adjusting the transit time of said second tape between said record head and said second-tape reproduce head so as to be slightly different from said fixed between head transit time of said playback apparatus, and combining the playback outputs of said first reproduce head and said second-tape reproduce head to obtain an enhanced version of said master recording.
Claim 8
Independent Claim
200 words
A method of enhancing a master recording contained on a first magnetic tape, comprising the steps of: playing back said first magnetic tape on a playback apparatus having first and second reproduce heads spaced in that order along the direction of tape travel, said playback apparatus having a fixed between head transit time correspoNding to the speed at which said master was recorded on said first tape, simultaneously recording the playback output of said second reproduce head onto a second magnetic tape via the record head of a separate magnetic tape recording apparatus, said recording apparatus having a second-tape reproduce head spaced further along the direction of tape travel from said record head for playing back said simultaneous recording, playing back said second tape via said second-tape reproduce head during the same passage as that on which said second tape is recorded, adjusting the transit time of said second tape between said record head and said second-tape reproduce head so as to be slightly different from said fixed between head transit time of said playback apparatus, and combining the playback outputs of said first reproduce head and said second-tape reproduce head to obtain an enhanced version of said master recording.
Claim 9
Dependent Claim
25 words
A method as defined in claim 6 wherein said combining comprises recording said first and third reproduce head playback outputs together on another magnetic tape.
Claim 10
Dependent Claim
43 words
A method as defined in claim 6 wherein said between head tape transit time in said recording apparatus is either faster than or slower than that in said playback apparatus, said third playback output thereby respectively leading or lagging said first playback output.
Claim 11
Dependent Claim
182 words
Apparatus for producing ''''quad'''' sound from a conventional, prerecorded two-channel stereophonic tape comprising: a first tape player for playing back said prerecorded tape and having reproduce heads spaced along the direction of tape travel to provide first and second stereophonic outputs separated in a time by a duration corresponding to the fixed between head transit time of said prerecorded tape, a separate two-track magnetic tape recording apparatus having a stereophonic record head and a stereophonic reproduce head situated in that order along the direction of tape travel, a second magnetic tape moving past said record and reproduce heads at a speed such that the transit time between said record and reproduce heads differs slightly from said fixed between head transit time, and means for supplying the earlier occurring first stereophonic output from said first tape player to said stereophonic record head for recording on said second magnetic tape, the stereophonic reproduce head of said separate recording apparatus thereafter providing another stereophonic output identical to, but differing slightly in time with respect to the later occurring, second stereophonic output from said tape player.
Claim 12
Dependent Claim
182 words
Apparatus for producing ''''quad'''' sound from a conventional, prerecorded two-channel stereophonic tape comprising: a first tape player for playing back said prerecorded tape and having reproduce heads spaced along the direction of tape travel to provide first and second stereophonic outputs separated in a time by a duration corresponding to the fixed between head transit time of said prerecorded tape, a separate two-track magnetic tape recording apparatus having a stereophonic record head and a stereophonic reproduce head situated in that order along the direction of tape travel, a second magnetic tape moving past said record and reproduce heads at a speed such that the transit time between said record and reproduce heads differs slightly from said fixed between head transit time, and means for supplying the earlier occurring first stereophonic output from said first tape player to said stereophonic record head for recording on said second magnetic tape, the stereophonic reproduce head of said separate recording apparatus thereafter providing another stereophonic output identical to, but differing slightly in time with respect to the later occurring, second stereophonic output from said tape player.
Claim 13
Dependent Claim
32 words
Apparatus as defined in claim 9 further comprising: a first pair of speakers receiving said later occurring tape player stereophonic output, and a second set of speakers receiving said apparatus stereophonic output.
Claim 14
Dependent Claim
32 words
Apparatus as defined in claim 9 wherein said second magnetic tape is endless, and further comprising means for erasing said endless magnetic tape after said tape has passed said apparatus reproduce head.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |