US5144650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communication apparatus having improved switching line connection between different signal paths
Assignee: Canon Inc
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Filing: 1990-12-03
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Granted: 1992-09-01
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Expires: 2010-12-03
Abstract
Abstract A communication apparatus comprises a switch to selectively connect a line to a speech communication path or a data communication path, signal receiving circuits connected to those two communication paths, a signal detection circuit for detecting a predetermined signal from an output of the signal receiving circuit, and a control circuit for modifying a detection criterion of the signal detection circuit in accordance with a line connection status of the switch.
Inventors
- 👤 Masao Kiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:37
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/32; H04N1/327; H04N1/32704; H04N1/32706; H04N1/32708; H04M; H04M1/00; H04N1/32715; H04N1/32719; H04N1/32728; H04N1/32732
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
70 words
A communication apparatus comprising: means for selectively connecting a line to a speech communication path or a data communication path; signal receiving means connected to said two communication paths; signal detection means for detecting a predetermined signal from an output of said signal receiving means; and control means for modifying a detection criterion of said signal detection means in accordance with a line connection status of said line connecting means.
Claim 2
Dependent Claim
70 words
A communication apparatus comprising: means for selectively connecting a line to a speech communication path or a data communication path; signal receiving means connected to said two communication paths; signal detection means for detecting a predetermined signal from an output of said signal receiving means; and control means for modifying a detection criterion of said signal detection means in accordance with a line connection status of said line connecting means.
Claim 3
Dependent Claim
24 words
A communication apparatus according to claim 1 wherein said signal receiving means includes a circuit for converting an analog signal to a binary signal.
Claim 4
Dependent Claim
19 words
A communication apparatus according to claim 2 wherein said signal detection means detects a period of said binary signal.
Claim 5
Dependent Claim
39 words
A communication apparatus according to claim 2 wherein said signal detection means includes a counter for detecting a period of said binary signal, and said control means discriminates the received signal in accordance with the count of said counter.
Claim 6
Dependent Claim
36 words
A communication apparatus according to claim 1 further comprising means for supplying one of the outputs of signal receiving circuits connected to the speech communication path and the data communication paths to said signal detection means.
Claim 7
Dependent Claim
103 words
A communication apparatus connected to a line together with a telephone set for switching a line connection between a telephone communication path and a data communication path to carry out communication by the telephone or data communication, comprising: signal receiving circuits connected to the telephone communication path and data communication path, a signal analysis circuit for detecting the reception of a predetermined signal based on an output of said signal receiving circuit; and a control circuit for modifying an analysis criterion of said signal analysis circuit depending on whether the line is connected to the telephone communication path or the data communication path.
Claim 8
Dependent Claim
103 words
A communication apparatus connected to a line together with a telephone set for switching a line connection between a telephone communication path and a data communication path to carry out communication by the telephone or data communication, comprising: signal receiving circuits connected to the telephone communication path and data communication path, a signal analysis circuit for detecting the reception of a predetermined signal based on an output of said signal receiving circuit; and a control circuit for modifying an analysis criterion of said signal analysis circuit depending on whether the line is connected to the telephone communication path or the data communication path.
Claim 9
Dependent Claim
24 words
A communication apparatus according to claim 6 wherein said control circuit discriminates the received signal based on the analysis by said signal analysis circuit.
Claim 10
Dependent Claim
33 words
A communication apparatus according to claim 7 wherein said signal receiving circuit converts a received analog signal to a binary signal, and said signal analysis circuit analyzes a period of said binary signal.
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) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |