Patent EP0226325A1 successfully refreshed from Google Patents.
EP0226325A1
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Signalling detection
Assignee: British Telecommunications PLC
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Filing: 1986-11-10
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Granted: —
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Expires: 2006-11-10
Abstract
Abstract A dial pulse detection system 20 has an analogue input buffer 22, an analogue to digital converter (ADC) 24, a processor 25, and an output buffer 26. Processor 25 operates on the digitally encoded samples produced by ADC 24 from the received signal to achieve detection of the dial pulse signalling data in the received signal. This detection process involves a training process and a recognition process. The training process extracts amplitude and timing characteristics of a first part of the received signal from a dialling instrument. These characteristics are then used to form a template for recognition of subsequent dialled digits. Detected digits are then made available at output buffer 26. Processor 25 includes a facility for sending an error signal to the user to indicate that dialled digits have not been correctly received.
Inventors
- 👤 David Sidney Cheeseman
- 👤 Arthur Jan Wright
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 22:26
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/32
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
59 words
A method of detecting dial pulse signalling data in a received signal comprising a training process and a recognition process, wherein the training process comprises processing of a portion of the received signal to extract characteristics of the received signal and said recognition process uses said characteristics to assist in detecting dial pulse signalling data in the received signal.
Claim 2
Independent Claim
59 words
A method of detecting dial pulse signalling data in a received signal comprising a training process and a recognition process, wherein the training process comprises processing of a portion of the received signal to extract characteristics of the received signal and said recognition process uses said characteristics to assist in detecting dial pulse signalling data in the received signal.
Claim 3
Dependent Claim
32 words
A method of detecting dial pulse signalling data as claimed in claim 1, wherein said portion of the received signal comprises particular known dial pulse signalling data expected by the training process.
Claim 4
Dependent Claim
36 words
A method of detecting dial pulse signalling data as claimed in claim 1 or claim 2, wherein said characteristics comprise information relating to timing and/or amplitude of the dial pulse signalling data in the received signal.
Claim 5
Dependent Claim
42 words
A method of detecting dial pulse signalling data as claimed in claim 3, wherein said information includes measured values for the maximum make pulse level, the maximum break pulse level, the make period, the break period, and the total dial pulse period.
Claim 6
Dependent Claim
35 words
A method of detecting dial pulse signalling data as claimed in claim 4, wherein the training process is re-started if a value obtained for the total dial pulse period is outside of a given tolerance.
Claim 7
Dependent Claim
42 words
A method of detecting dial pulse signalling as claimed in claim 4 or claim 5, wherein the recognition process comprises measuring the level of received signals during short time periods spaced according to the measured spacing of pulses during the training process.
Claim 8
Dependent Claim
23 words
A method of detecting dial pulse signalling data as claimed in claim 6, wherein said short time periods are less than 15 ms.
Claim 9
Dependent Claim
49 words
A method of detecting dial pulse signalling data as claimed in claim 6 or claim 7, wherein the recognition process includes comparing the level of received signals during said periods with the pulse levels derived from the training process to detect the presence or absence of valid dial pulses.
Claim 10
Dependent Claim
34 words
A method of detecting dial pulse signalling data as claimed in claim 8, wherein the recognition process includes storing information on said detection for each time period in respective locations of a data store.
Claim 11
Independent Claim
33 words
A method of detecting dial pulse signalling data as claimed in any one of claims 6 to 9, wherein said recognition process is terminated and/or re-started according to a count of pulse absences.
Claim 12
Dependent Claim
35 words
A method of detecting dial pulse signalling data as claimed in claim 10, wherein said count of pulse absences is reset by subsequent detection of the presence of at least two consecutively valid dial pulses.
Claim 13
Dependent Claim
46 words
A method of detecting dial pulse signalling data as claimed in claim 9, wherein said recognition process derives a detected value of a dialled digit by examination of the information stored in the locations of the data store representing at least two consecutively valid dial pulses.
Claim 14
Independent Claim
38 words
A method of detecting dial pulse signalling data as claimed in any preceding claim, wherein if the training process fails to extract said characteristics from said portion of received signal, the training process will transmit a failure message.
Claim 15
Independent Claim
30 words
A method of detecting dial pulse signalling data as claimed in any preceding claim, wherein said recognition process includes transmitting a message to indicate the detected dial pulse signalling data.
Claim 16
Independent Claim
26 words
A method of detecting dial pulse signalling data as claimed in any preceding claim, wherein the received signal comprises digitally encoded representations of telephone dial pulses.
Claim 17
Dependent Claim
32 words
A method of detecting dial pulse signalling data as claimed in claim 15 wherein said portion of received signal processed by the training process comprises representations of at least four dial pulses.
Claim 18
Dependent Claim
41 words
A detector for dial pulse signalling data comprising means for processing a portion of a received signal to extract characteristics of the received signal and operable using said characteristics to assist in detecting dial pulse signalling data in the received signal.
Claim 19
Dependent Claim
41 words
A detector for dial pulse signalling data comprising means for processing a portion of a received signal to extract characteristics of the received signal and operable using said characteristics to assist in detecting dial pulse signalling data in the received signal.
Claim 20
Dependent Claim
49 words
Interactive terminal equipment comprising a detector as claimed in claim 17, for detecting digits dialled, said equipment being adapted to transmit messages to the user inviting the user to dial digits according to the user's requirements and to provide a service to the user dependent on the digits dialled.
Claim 21
Dependent Claim
38 words
Interactive terminal equipment as claimed in claim 18, wherein the equipment is associated with an exchange to provide an automatic operator service so that an outside exchange line user is able to dial any extension on the exchange.
Claim 22
Independent Claim
19 words
A method of detecting dial pulse signalling data substantially as hereinbefore described and with reference to the accompanying drawings.
Claim 23
Independent Claim
19 words
A method of detecting dial pulse signalling data substantially as hereinbefore described and with reference to the accompanying drawings.
Claim 24
Dependent Claim
18 words
Apparatus for detecting dial pulse signalling data substantially as hereinbefore described and with reference to the accompanying drawings.
Claim 25
Dependent Claim
18 words
Apparatus for detecting dial pulse signalling data substantially as hereinbefore described and with reference to the accompanying drawings.
References Cited (Backward Citations)
US3917913A
Cited
DE2753364A1
Cited
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