US3715518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interrupt network to protect a voice frequency signal detector from being talked-off by outgoing speech signals
Assignee: AT&T Inc
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Filing: 1971-12-08
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Granted: 1973-02-06
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Expires: 1991-12-08
Abstract
Abstract A station set which includes a two-way voice channel interconnects a telephone line and a voice recorder. The station set receiver detects incoming voice-frequency tone signals an, in response thereto, instructs the recorder to record, play back, select desired records, stop, et cetera. The playback signals may also contain the tone signals and the receiver is protected from being talked-off by the reflection of these outgoing signals. The protection involves momentarily interrupting the outgoing transmission when the tone signals are detected and enabling the station set to provide instructions to the recorder only in the event that detection of the tone signals continues during the interrupt interval. The duration of the interrupt interval is short so that the playback interruption is not objectionable and may not even be noticed by a listener.
Inventors
- 👤 R Campbell
- 👤 G Honnold
- 👤 M Lefkowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:05
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/444; H04Q1/46; H04M; H04M1/00; H04M1/64; H04M1/65; H04M1/652
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
75 words
In a station set which includes a transmitter for sending voice frequency signals to a line and a receiver for detecting incoming signals received from the line, the incoming signals being within the voice frequency band, means responsive to signals froM the line for disabling the transmitter for a momentary interval of time, and means effective during the momentary interval and responsive to the continuance of the signals from the line for enabling the receiver.
Claim 2
Dependent Claim
75 words
In a station set which includes a transmitter for sending voice frequency signals to a line and a receiver for detecting incoming signals received from the line, the incoming signals being within the voice frequency band, means responsive to signals froM the line for disabling the transmitter for a momentary interval of time, and means effective during the momentary interval and responsive to the continuance of the signals from the line for enabling the receiver.
Claim 3
Dependent Claim
75 words
In a station set which includes a transmitter for sending voice frequency signals to a line and a receiver for detecting incoming signals received from the line, the incoming signals being within the voice frequency band, means responsive to signals froM the line for disabling the transmitter for a momentary interval of time, and means effective during the momentary interval and responsive to the continuance of the signals from the line for enabling the receiver.
Claim 4
Dependent Claim
75 words
In a station set which includes a transmitter for sending voice frequency signals to a line and a receiver for detecting incoming signals received from the line, the incoming signals being within the voice frequency band, means responsive to signals froM the line for disabling the transmitter for a momentary interval of time, and means effective during the momentary interval and responsive to the continuance of the signals from the line for enabling the receiver.
Claim 5
Dependent Claim
157 words
A station set for interconnecting a machine with a communication line, the machine being operated by control signals and having the capability of sending voice frequency signals, the station set including a receiver having means for detecting tone signals in the voice frequency band received from the line and means responsive to the detecting means for developing the control signals and further including a transmitter for applying to the line the voice frequency signals sent by the machine, characterized in that the station set includes means for precluding the development of control signals in response to the reflection of voice frequency signals applied to the line by the transmitter comprising: means responsive to the detection of tone signals for disabling the transmitter to interrupt the application of signals to the line for a momentary interval of time and means responsive to continuance of the detection of tone signals during the momentary interval for enabling the developing means.
Claim 6
Dependent Claim
157 words
A station set for interconnecting a machine with a communication line, the machine being operated by control signals and having the capability of sending voice frequency signals, the station set including a receiver having means for detecting tone signals in the voice frequency band received from the line and means responsive to the detecting means for developing the control signals and further including a transmitter for applying to the line the voice frequency signals sent by the machine, characterized in that the station set includes means for precluding the development of control signals in response to the reflection of voice frequency signals applied to the line by the transmitter comprising: means responsive to the detection of tone signals for disabling the transmitter to interrupt the application of signals to the line for a momentary interval of time and means responsive to continuance of the detection of tone signals during the momentary interval for enabling the developing means.
Claim 7
Dependent Claim
65 words
A station set in accordance with claim 2 wherein the disabling means includes timing means for determining the duration of the momentary interval of time, the timing means being arranged to determine an interval having a short duration of time so that the interruption is not annoying and may not even by noticed by one listening to the voice frequency signals sent to the line.
Claim 8
Dependent Claim
48 words
A station set in accordance with claim 3 wherein the disabling means further includes switch means interposed between an output of the transmitter and the line and operated by the timing means for blocking the application of the voice frequency signals to the line for the momentary interval.
Claim 9
Dependent Claim
63 words
A station set in accordance with claim 2 wherein the enabling means includes delay means for designating a delay period after the initiation of the momentary interval of time and means responsive to a continuance of the detection of the tone signals after the initiation of the momentary interval and operated at the termination of the delay period for enabling the developing means.
Claim 10
Dependent Claim
23 words
A station set in accordance with claim 5 wherein the delay period terminates concurrently with the termination of the momentary interval of time.
Claim 11
Dependent Claim
30 words
A station set in accordance with claim 5 wherein the enabling means further includes means for extending an output of the detecting means to an input of the developing means.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |