US3916121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dictaphone system for message correction
Assignee: STUZZI RADIOTECHNISCHE FABRIK SPEZIALUNTERNEHMEN fur Firma
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Filing: 1973-10-09
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Granted: 1975-10-28
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Expires: 1993-10-09
Abstract
Abstract In a dictaphone of the type having at least two parallel recording tracks including a main track for recording normal text and a secondary track for recording text corrections and amendments, the tracks being provided with separate recording channels to either of which a microphone or other source of sound-dependent voltage can be switched, there is provided means operative when the source of sound-dependent voltage is switched from the main track recording channel to the secondary track recording channel, to connect the main track recording channel simultaneously to a low frequency signalling device. Hence, a tone (preferably intermittent) is recorded on the main track whilst amendments are being recorded on the secondary track. The tone may be switched off automatically after a predetermined period following the start of recording on the secondary track.
Inventors
- 👤 Viktor Stuzzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:11
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/02; G11B27/022; G11B27/029; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3009; G11B2220/00; G11B2220/90; G11B27/024
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
108 words
A dictaphone comprising a common carrier having at least two parallel recording tracks thereon including a main track for recording normal text and a secondary track for recording text corrections and amendments, said main and secondary tracks being provided with separate recording channels to either of which a source of sound-dependent voltage can be switched, the dictaphone further including switching means operative when the source of sound-dependent voltage is switched from the main track recording channel to the secondary track recording channel for connecting the main track recording channel simultaneously to a low frequency signalling device for recording a warning signal over a portion of said main track.
Claim 2
Dependent Claim
108 words
A dictaphone comprising a common carrier having at least two parallel recording tracks thereon including a main track for recording normal text and a secondary track for recording text corrections and amendments, said main and secondary tracks being provided with separate recording channels to either of which a source of sound-dependent voltage can be switched, the dictaphone further including switching means operative when the source of sound-dependent voltage is switched from the main track recording channel to the secondary track recording channel for connecting the main track recording channel simultaneously to a low frequency signalling device for recording a warning signal over a portion of said main track.
Claim 3
Dependent Claim
13 words
A dictaphone according to claim 1, in which the signalling device operates intermittently.
Claim 4
Dependent Claim
29 words
A dictaphone according to claim 1, in which the signalling device is connected to an optical and/or acoustic indicator simultaneously with its connection to said main track recording channel.
Claim 5
Dependent Claim
37 words
A dictaphone according to claim 1, including time switch means connected in circuit relationship with said signalling device, for automatically disconnecting the signalling device from the main track recording channel after a preset period following its connection.
Claim 6
Dependent Claim
14 words
A dictaphone according to claim 4, in which the time switch means is electronic.
Claim 7
Dependent Claim
47 words
A dictaphone according to claim 1, including a record/play-back amplifier; two heads; and change-over switching means for connecting the heads to said record/play-back amplifier in a first mode in which they operate as recording heads and in a second mode in which they operate as play-back heads.
Claim 8
Dependent Claim
61 words
A dictaphone according to claim 6, in which means for switching the sound-dependent voltage source between the recording channels and/or the change-over switching means for changing from recording to replay and/or indicator means for indicating that the signalling device is connected to the main track recording channel are arranged on a hand microphone which serves as the source of sound-dependent voltage.
Claim 9
Dependent Claim
53 words
A dictaphone according to claim 1, in which replay heads for the main and secondary tracks are connected via separate pre-amplifiers to a play-back amplifier, said pre-amplifiers being normally blocked or inoperative, and in which a foot pedal switch is operable to appLy signals to the pre-amplifiers for unblocking or energizing the pre-amplifiers.
Claim 10
Dependent Claim
65 words
A dictaphone according to claim 8, in which the foot pedal switch applies said unblocking or energising signal to the pre-amplifier for the replay head of the main track at a first switch position and applies said unblocking or energising signal to the pre-amplifier for the replay head of the secondary track at a second switch position reached by increased pressure on the foot pedal.
Claim 11
Dependent Claim
61 words
A replay device for replaying recordings made with a dictaphone according to claim 1, in which replay heads for the main and secondary tracks are connected via separate pre-amplifiers to a play-back amplifier, said pre-amplifiers being normally blocked or inoperative, and in which a foot pedal switch is operable to apply signals to the pre-amplifiers for unblocking or energizing the pre-amplifiers.
Claim 12
Dependent Claim
65 words
A device according to claim 10, in which the foot pedal switch applies said unblocking or energising signal to the pre-amplifier for the replay head of the main track at a first switch position and applies said unblocking or energizing signal to the pre-amplifier for the replay head of the secondary track at a second switch position reached by increased pressure on the foot pedal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |