US3560656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Binaural phase differential system
Assignee: Dictaphone Corp
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Filing: 1967-05-01
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Granted: 1971-02-02
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Expires: 1987-05-01
Abstract
Abstract Monaural electrical signals are divided into two separate components flowing in two separate channels, and the phase of the signal in one channel is shifted by means of a Wien bridge which has been offset (unbalanced) so as to transmit signals at all frequencies of interest substantially without attenuation. The signal in each channel is conducted to a separate loud speaker with the transducers either spatially separated or coupled together to form a headset. The phase difference between the signal from one speaker and the signal from the other provides depth and reality in the reproduced sound. Use of this system in dictation recording and reproducing equipment is described.
Inventors
- 👤 Roswell W Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:21
CPC Classifications
H; H04; H04S; H04S5/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
105 words
Apparatus for reproducing sound binaurally from a monaural electrical signal having a plurality of frequencies in the audio spectrum, said apparatus comprising, in combination, means for supplying a monaural electrical signal, means for dividing said signal into at least two separate components and conducting each of said components into a different sound transducer, means for shifting the phase relationship of said components with respect to one another and maintaining the amplitude of each of said components substantially equal to the amplitude of the other of said components at substantially all frequencies of the sound being reproduced, wherein the maximum phase shift is greater than 360*.
Claim 2
Dependent Claim
105 words
Apparatus for reproducing sound binaurally from a monaural electrical signal having a plurality of frequencies in the audio spectrum, said apparatus comprising, in combination, means for supplying a monaural electrical signal, means for dividing said signal into at least two separate components and conducting each of said components into a different sound transducer, means for shifting the phase relationship of said components with respect to one another and maintaining the amplitude of each of said components substantially equal to the amplitude of the other of said components at substantially all frequencies of the sound being reproduced, wherein the maximum phase shift is greater than 360*.
Claim 3
Dependent Claim
16 words
Apparatus as in claim 1 in which said phase shifting means is an all-pass phase-shifting network.
Claim 4
Dependent Claim
17 words
Apparatus as in claim 2 in which said phase shifting means is an offset Wien bridge circuit.
Claim 5
Dependent Claim
24 words
Apparatus as in claim 3 in which said dividing means is a phase splitter utilizing the impedances of said bridge circuit as voltage-divider impedances.
Claim 6
Dependent Claim
18 words
Apparatus as in claim 4 in which said impedances are equal resistances in adjacent arms of said bridge.
Claim 7
Dependent Claim
110 words
Apparatus for reproducing, in multiple sound transducers, multicomponent electrical signals having a plurality of frequencies in the audio spectrum, said apparatus comprising, in combination, separate means for conducting each of said components to a separate one of said transducers, a Wien bridge forming a part of one of said conducting means, said Wien bridge being offset so as to shift the phase of the signal flowing through it with respect to the signal flowing through another of said conducting means, while maintaining the amplitude of the signal flowing through said Wien bridge substantially constant at substantially all sound frequencies being reproduced, wherein the maximum phase shift is greater than 360*.
Claim 8
Dependent Claim
110 words
Apparatus for reproducing, in multiple sound transducers, multicomponent electrical signals having a plurality of frequencies in the audio spectrum, said apparatus comprising, in combination, separate means for conducting each of said components to a separate one of said transducers, a Wien bridge forming a part of one of said conducting means, said Wien bridge being offset so as to shift the phase of the signal flowing through it with respect to the signal flowing through another of said conducting means, while maintaining the amplitude of the signal flowing through said Wien bridge substantially constant at substantially all sound frequencies being reproduced, wherein the maximum phase shift is greater than 360*.
Claim 9
Dependent Claim
15 words
Apparatus as in claim 6 in which said sound transducers are loudspeakers in a headset.
Claim 10
Dependent Claim
16 words
Apparatus as in claim 6 in which said sound transducers are spatially and physically separate loudspeakers.
Claim 11
Dependent Claim
13 words
Apparatus as in claim 6 including a plurality of cascaded all-pass Wien bridges.
Claim 12
Dependent Claim
103 words
In a dictation machine, two separate sound transducers, means for converting monaurally recorded dictation into single-channel electrical signals having a plurality of frequencies in the audio spectrum, a phase splitter for receiving said signals and transmitting them over two separate conduction paths to said sound transducers, means in one of said paths for shifting the phase of the signal flowing in said one path with respect to the signal flowing in the other path while transmitting the signal through said one path with a substantially constant amplitude at substantially all sound frequencies being reproduced, wherein the maximum phase shift is greater than 360*.
Claim 13
Dependent Claim
103 words
In a dictation machine, two separate sound transducers, means for converting monaurally recorded dictation into single-channel electrical signals having a plurality of frequencies in the audio spectrum, a phase splitter for receiving said signals and transmitting them over two separate conduction paths to said sound transducers, means in one of said paths for shifting the phase of the signal flowing in said one path with respect to the signal flowing in the other path while transmitting the signal through said one path with a substantially constant amplitude at substantially all sound frequencies being reproduced, wherein the maximum phase shift is greater than 360*.
Claim 14
Dependent Claim
21 words
Apparatus as in claim 10 in which said sound transducers are loudspeakers in a headset electrically connected to said dictation machine.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |