US6496572B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Call-waiting tone detection technique
Assignee: Avago Technologies International Sales Pte Ltd
•
Filing: 2001-12-20
•
Granted: 2002-12-17
•
Expires: 2021-12-20
Abstract
Abstract Reliable detection of a call-waiting tone is provided by employing a correlation based technique. A modem or other device employing such a technique need not rely on carrier drop detection and is generally insensitive to other energy or noise on the line.
Inventors
- 👤 Haixiang Liang
- 👤 Zarko Draganic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:28
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06; H04M3/00; H04M3/42; H04M3/428; H04M3/4281
Claims Analysis
Total Claims: 62
Claim 1
Independent Claim
47 words
A communications device comprising: a telephone-line communications interface; a call-waiting tone detector coupled to the telephone-line communications interface, the call-waiting tone detector correlating a received signal with a phase-shifted version thereof to identify call-waiting tone therein, wherein the phase-shift corresponds to a period of the call-waiting tone.
Claim 2
Dependent Claim
47 words
A communications device comprising: a telephone-line communications interface; a call-waiting tone detector coupled to the telephone-line communications interface, the call-waiting tone detector correlating a received signal with a phase-shifted version thereof to identify call-waiting tone therein, wherein the phase-shift corresponds to a period of the call-waiting tone.
Claim 3
Dependent Claim
23 words
The communications device of claim 1 , wherein the phase-shift substantially corresponds to an integer multiple of the period of the call-waiting tone.
Claim 4
Dependent Claim
23 words
The communications device of claim 1 , wherein the phase-shift substantially corresponds to a half multiple of the period of the call-waiting tone.
Claim 5
Dependent Claim
11 words
The communications device of claim 1 , embodied as a modem.
Claim 6
Dependent Claim
44 words
The communications device of claim 1 , embodied as one or more of: a set top box; an internet terminal device; a satellite or pay TV authorization device; a fax machine; a personal digital assistant; a portable computer; and a cellular or mobile phone.
Claim 7
Dependent Claim
17 words
The communications device of claim 1 , embodied as a telephone, speakerphone or other voice terminal equipment.
Claim 8
Dependent Claim
20 words
The communications device of claim 1 , providing an internet call-waiting facility while operating in accordance with ITU-T Recommendation V.34.
Claim 9
Dependent Claim
12 words
The communications device of claim 1 , providing an internet call-waiting facility.
Claim 10
Dependent Claim
13 words
The communications device of claim 1 , providing a modem on hold facility.
Claim 11
Independent Claim
62 words
A method of detecting a call-waiting tone, the method comprising: correlating a received signal with two phase shifted versions thereof, wherein phase shifts for respective ones of the correlations substantially correspond to an integer multiple and to a half-multiple of a period of the call-waiting tone, respectively; and evaluating the results of the correlations against respective thresholds to identify the call-waiting tone.
Claim 12
Independent Claim
62 words
A method of detecting a call-waiting tone, the method comprising: correlating a received signal with two phase shifted versions thereof, wherein phase shifts for respective ones of the correlations substantially correspond to an integer multiple and to a half-multiple of a period of the call-waiting tone, respectively; and evaluating the results of the correlations against respective thresholds to identify the call-waiting tone.
Claim 13
Dependent Claim
46 words
A call-waiting detector comprising: a telephone-line communications interface; and a tone detector coupled to the telephone-line communications interface, the tone detector correlating a received signal with a phase-shifted version thereof to identify call-waiting tone therein, wherein the phase-shift corresponds to a period of the call-waiting tone.
Claim 14
Dependent Claim
46 words
A call-waiting detector comprising: a telephone-line communications interface; and a tone detector coupled to the telephone-line communications interface, the tone detector correlating a received signal with a phase-shifted version thereof to identify call-waiting tone therein, wherein the phase-shift corresponds to a period of the call-waiting tone.
Claim 15
Dependent Claim
23 words
The call-waiting detector of claim 11 , wherein the phase-shift substantially corresponds to an integer multiple of the period of the call-waiting tone.
Claim 16
Dependent Claim
23 words
The call-waiting detector of claim 11 , wherein the phase-shift substantially corresponds to a half multiple of the period of the call-waiting tone.
Claim 17
Dependent Claim
15 words
The call-waiting detector of claim 11 , integrated into a receive path of a modem.
Claim 18
Dependent Claim
44 words
The call-waiting detector of claim 11 , integrated into a receive path of: a set top box; an internet terminal device; a satellite or pay TV authorization device; a fax machine; a personal digital assistant; a portable computer; and a cellular or mobile phone.
Claim 19
Dependent Claim
17 words
The call-waiting detector of claim 11 , embodied in a telephone, speakerphone or other voice terminal equipment.
Claim 20
Dependent Claim
15 words
The call-waiting detector of claim 11 , coupled between a telephone line and a modem.
Claim 21
Dependent Claim
17 words
The call-waiting detector of claim 17 , further coupled between the telephone line and a telephone handset.
Claim 22
Dependent Claim
16 words
The call-waiting detector of claim 11 , coupled between a telephone line and a telephone handset.
Claim 23
Dependent Claim
19 words
The call-waiting detector of claim 11 , further comprising: an incoming call indication interface to an on-screen visual display.
Claim 24
Dependent Claim
25 words
The call-waiting detector of claim 11 , further comprising: an incoming call indication interface that supplies a ring indication for supply to a telephone handset.
Claim 25
Dependent Claim
17 words
The call-waiting detector of claim 11 , wherein the call waiting tone is a 440 Hz tone.
Claim 26
Independent Claim
102 words
A method of operating a communications device, the method comprising: initiating a session with a remote data communications device; receiving a signal via a telephone line, the signal including data from the remote data communications device; detecting in the received signal a call-waiting tone and, in response thereto, indicating an incoming call, wherein the detection includes correlating the received signal with a phase-shifted version thereof to identify the call-waiting tone, wherein the phase-shift corresponds to a period of the call-waiting tone; and in response to acceptance of the incoming call, supplying a flash indication on the telephone line; and suspending the session.
Claim 27
Independent Claim
102 words
A method of operating a communications device, the method comprising: initiating a session with a remote data communications device; receiving a signal via a telephone line, the signal including data from the remote data communications device; detecting in the received signal a call-waiting tone and, in response thereto, indicating an incoming call, wherein the detection includes correlating the received signal with a phase-shifted version thereof to identify the call-waiting tone, wherein the phase-shift corresponds to a period of the call-waiting tone; and in response to acceptance of the incoming call, supplying a flash indication on the telephone line; and suspending the session.
Claim 28
Dependent Claim
22 words
The method of claim 23 , wherein the phase-shift substantially corresponds to an integer multiple of the period of the call-waiting tone.
Claim 29
Dependent Claim
22 words
The method of claim 23 , wherein the phase-shift substantially corresponds to a half multiple of the period of the call-waiting tone.
Claim 30
Dependent Claim
13 words
The method of claim 23 , wherein the acceptance is by a user.
Claim 31
Dependent Claim
19 words
The method of claim 23 , wherein the detection occurs while the communications device is in a doze state.
Claim 32
Dependent Claim
11 words
The method of claim 23 , further comprising: resuming the session.
Claim 33
Dependent Claim
14 words
The method of claim 23 , further comprising: supplying the incoming call indication visually.
Claim 34
Dependent Claim
14 words
The method of claim 23 , further comprising: supplying the incoming call indication audibly.
Claim 35
Dependent Claim
13 words
The method of claim 23 , wherein the communications device is a modem.
Claim 36
Dependent Claim
48 words
The method of claim 23 , wherein the communications device is embodied as one or more of: a set top box; an internet terminal device; a satellite or pay TV authorization device; a fax machine; a personal digital assistant; a portable computer; and a cellular or mobile phone.
Claim 37
Dependent Claim
19 words
The method of claim 23 , wherein the communications device is a telephone, speakerphone or other voice terminal equipment.
Claim 38
Independent Claim
87 words
A method of operating a communications device, the method comprising: initiating a session with a remote data communications device; receiving a signal including data from the remote data communications device; detecting in the received signal a call-waiting tone and, in response thereto, indicating an incoming call, wherein the detection includes correlating the received signal with a phase-shifted version thereof to identify the call-waiting tone, wherein the phase-shift corresponds to a period of the call-waiting tone; and continuing the session if the incoming call is rejected or ignored.
Claim 39
Independent Claim
87 words
A method of operating a communications device, the method comprising: initiating a session with a remote data communications device; receiving a signal including data from the remote data communications device; detecting in the received signal a call-waiting tone and, in response thereto, indicating an incoming call, wherein the detection includes correlating the received signal with a phase-shifted version thereof to identify the call-waiting tone, wherein the phase-shift corresponds to a period of the call-waiting tone; and continuing the session if the incoming call is rejected or ignored.
Claim 40
Dependent Claim
22 words
The method of claim 34 , wherein the phase-shift substantially corresponds to an integer multiple of the period of the call-waiting tone.
Claim 41
Dependent Claim
22 words
The method of claim 34 , wherein the phase-shift substantially corresponds to a half multiple of the period of the call-waiting tone.
Claim 42
Dependent Claim
13 words
The method of claim 34 , wherein the rejection is by a user.
Claim 43
Dependent Claim
21 words
The method of claim 34 , further comprising: reestablishing a connection between the communications device and the remote data communications device.
Claim 44
Dependent Claim
14 words
The method of claim 34 , further comprising: supplying the incoming call indication visually.
Claim 45
Dependent Claim
14 words
The method of claim 34 , further comprising: supplying the incoming call indication audibly.
Claim 46
Dependent Claim
13 words
The method of claim 34 , wherein the communications device is a modem.
Claim 47
Dependent Claim
50 words
The method of claim 34 , wherein the communications device is embodied as or in one or more of: a set top box; an internet terminal device; a satellite or pay TV authorization device; a fax machine; a personal digital assistant; a portable computer; and a cellular or mobile phone.
Claim 48
Independent Claim
43 words
An apparatus comprising: a receive communications path that includes at least near-end echo cancellation; and a call-waiting tone detector coupled into the receive communications path to correlate phase-shifted representations of an echo cancelled received signal and thereby detect presence 440 Hz tone therein.
Claim 49
Independent Claim
43 words
An apparatus comprising: a receive communications path that includes at least near-end echo cancellation; and a call-waiting tone detector coupled into the receive communications path to correlate phase-shifted representations of an echo cancelled received signal and thereby detect presence 440 Hz tone therein.
Claim 50
Dependent Claim
31 words
The apparatus of claim 43 , wherein at least one phase-shift corresponds a number of samples that substantially corresponds to an integer multiple of the period of the 440 Hz tone.
Claim 51
Dependent Claim
31 words
The apparatus of claim 43 , wherein at least one phase-shift corresponds a number of samples that substantially corresponds to an half multiple of the period of the 440 Hz tone.
Claim 52
Dependent Claim
36 words
The apparatus of claim 43 , embodied as a communications device and further comprising: a processor, wherein both the receive communications path and the call waiting tone detector are embodied as software executable by the processor.
Claim 53
Dependent Claim
17 words
The communications device of claim 46 , further comprising: user interface software also executable by the processor.
Claim 54
Dependent Claim
35 words
The communications device of claim 47 , wherein the user interface software is responsive to an indication from the call waiting tone detector and in response thereto supplies a visual or audible incoming call indication.
Claim 55
Dependent Claim
26 words
The communications device of claim 46 , configured as one or more of: a personal digital assistant; a portable computer; and a cellular or mobile phone.
Claim 56
Dependent Claim
15 words
The apparatus of claim 43 , embodied as a speakerphone or other voice terminal equipment.
Claim 57
Dependent Claim
40 words
The apparatus of claim 43 , at least partially embodied as a computer program product encoding instructions in a computer readable medium selected from the set of media including magnetic storage media, optical storage media and communications media conveying signals.
Claim 58
Independent Claim
40 words
An apparatus comprising: means for receiving a signal from a telephone line; and means for correlating the received signal with a phase-shifted version thereof to identify call-waiting tone therein, wherein the phase-shift corresponds to a period of the call-waiting tone.
Claim 59
Independent Claim
40 words
An apparatus comprising: means for receiving a signal from a telephone line; and means for correlating the received signal with a phase-shifted version thereof to identify call-waiting tone therein, wherein the phase-shift corresponds to a period of the call-waiting tone.
Claim 60
Dependent Claim
44 words
The apparatus of claim 52 , means for correlating the received signal with at least a second phase-shifted version thereof, wherein the phase-shift and the second phase-shift respectively correspond to an integer multiple and a half multiple of the period of the call-waiting tone.
Claim 61
Dependent Claim
22 words
The apparatus of claim 52 , wherein the phase-shift substantially corresponds to an integer multiple of the period of the call-waiting tone.
Claim 62
Dependent Claim
22 words
The apparatus of claim 52 , wherein the phase-shift substantially corresponds to a half multiple of the period of the call-waiting tone.
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) | 2005-12-16 | 2006-06-17 | 2006-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-12-16 | 2010-06-17 | 2010-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-12-16 | 2014-06-17 | 2014-12-17 | $7700.00 | Window Closed / Lapsed |