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US4625326A
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Apparatus for generating a pseudo-stereo signal
Assignee: US Philips Corp
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Filing: 1984-11-05
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Granted: 1986-11-25
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Expires: 2004-11-05
Abstract
Abstract An apparatus for generating a pseudo-stereo signal comprises at least two signal channels (3, 4), each signal channel (3) comprising a delay line (7) of which an output is fed back to the input (via g 2 ). The delay lines (7, 8) have tappings (12, 13 and 14, 15 respectively). The tappings (12, 14 and 13, 15 respectively) are coupled to inputs of two signal-combination units (18 and 19, respectively) whose outputs (20, 21) are coupled to two output terminals (22, 23) to supply the pseudo-stereo signal (FIG. 1).
Inventors
- 👤 Wilhelmus J. W. Kitzen
- 👤 Mathias H. Geelen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:48
CPC Classifications
H; H04; H04S; H04S5/00; Y; Y10; Y10S; Y10S84/00; Y10S84/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
153 words
An apparatus for generating a pseudo-stereo signal, which apparatus comprises: an input terminal for receiving a mono signal, at least two signal channels, each comprising a delay line, coupled to the input terminal, each delay line having an input and an output, the output being fed back to the input, and a first and a second signal-combination unit, each having an output, which outputs are coupled to a first and a second output terminal respectively, for supplying a first and a second output signal, characterized in that the delay lines are each provided with first and second taps, the first tappings of the delay lines are coupled to an input of the first signal-combination unit, the second taps of the delay lines are coupled to an input of the second signal-combination unit, and the first tap of each of at least two of said delay lines not coinciding with the second tap thereof.
Claim 2
Independent Claim
153 words
An apparatus for generating a pseudo-stereo signal, which apparatus comprises: an input terminal for receiving a mono signal, at least two signal channels, each comprising a delay line, coupled to the input terminal, each delay line having an input and an output, the output being fed back to the input, and a first and a second signal-combination unit, each having an output, which outputs are coupled to a first and a second output terminal respectively, for supplying a first and a second output signal, characterized in that the delay lines are each provided with first and second taps, the first tappings of the delay lines are coupled to an input of the first signal-combination unit, the second taps of the delay lines are coupled to an input of the second signal-combination unit, and the first tap of each of at least two of said delay lines not coinciding with the second tap thereof.
Claim 3
Dependent Claim
98 words
An apparatus as claimed in claim 1, characterized in that viewed in time the first taps of half the number of the delay lines are situated before the second taps and, conversely, the second taps of the other delay lines are situated before the first taps if the number n of said signal channels is even and viewed in time the first tappings of ##EQU5## of the delay lines are situated before the second tappings and, conversely, the second tappings of ##EQU6## of the delay lines are situated before the first tappings if the number n is odd.
Claim 4
Dependent Claim
29 words
An apparatus as claimed in claim 1 or 2, characterized in that the input and the output of each delay line constitute the two taps of the delay line.
Claim 5
Dependent Claim
44 words
An apparatus as claimed in claim 1, the input of at least one of said delay lines being one of the two taps of that delay line, characterized in that an additional delay line is arranged between the input terminal and the signal channels.
Claim 6
Dependent Claim
19 words
An apparatus as claimed in claim 4, characterized in that the delay of the additional delay line is variable.
Claim 7
Dependent Claim
149 words
An apparatus as claimed in claim 2, comprising six signal channels with associated delay lines, the inputs of three of the six delay lines constituting the first taps of these delay lines and the inputs of the other three delay lines constituting the second taps of these delay lines, characterized in that of said three first taps which are constituted by the inputs of the associated delay lines at least one tap is coupled to the first signal-combination unit via an inverting element and at least one tap is not coupled via an inverting element to said first signal-combination unit, and of said three second taps which are constituted by the inputs of the associated delay lines at least one tap is coupled to the second signal-combination unit via an inverting element and at least one tap is not coupled via an inverting element to said second signal-combination unit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |