US3573752A
Expired / Lapsed
US
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Pulse-code-modulation system with converging signal paths
Assignee: Italtel SpA
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Filing: 1969-07-01
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Granted: 1971-04-06
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Expires: 1989-07-01
Abstract
Abstract At a point of convergence of several transmission paths, each carrying a multiplicity of channels in the form of interleaved code signals, recurring at different repetition frequencies, selected channels from different incoming paths are sampled at a rate equal to or higher than the highest repetition frequency among these channels for transfer to an outgoing transmission path. Whenever a channel is resampled before arrival of the next code signal thereof, a special control pulse indicates this fact and actuates a discriminating circuit at the remote end of the outgoing path to prevent the registration of a spurious code signal in a memory section assigned to such channel, thereby making the mean rate of registration equal to the original repetition frequency of the signals constituting this channel. The signals so stored can be read out, at an accelerated rate (if necessary), for further retransmission in the aforedescribed way or for decoding at a terminal.
Inventors
- 👤 Evangelo Lyghounis
- 👤 Isidoro Poretti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:58
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/07; H04J3/073; H04J3/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
234 words
In a communication system comprising a plurality of incoming transmission paths converging at a junction and at least one outgoing transmission path leaving said junction, each of said paths being adapted to carry a multiplicity of message channels in the form of interleaved code signals recurring at different repetition frequencies in the several paths, the combination therewith of: memory means at said junction for each incoming path having respective registers assigned to said channels for temporarily storing the signals thereof; reading means at said junction for periodically sampling selected registers of at least some of said memory means at a rate at least equal to the highest repetition frequency among the channels assigned to the sampled registers to constitute a composite train of interleaved signals for retransmission over said outgoing path to a remote destination; sensing means in said reading means for detecting the absence of a new signal in a previously sampled register upon resampling thereof and for generating a characteristic pulse in a time slot reserved for the corresponding channel; utilization means at said remote destination for extracting the signals of any channel retransmitted over said outgoing path; and discriminating means at said remote destination responsive to said characteristic pulse for inhibiting said utilization means to prevent the extraction of a spurious signal whereby the retransmitted signals of any channel are extracted at a mean rate corresponding to their original repetition frequency.
Claim 2
Dependent Claim
234 words
In a communication system comprising a plurality of incoming transmission paths converging at a junction and at least one outgoing transmission path leaving said junction, each of said paths being adapted to carry a multiplicity of message channels in the form of interleaved code signals recurring at different repetition frequencies in the several paths, the combination therewith of: memory means at said junction for each incoming path having respective registers assigned to said channels for temporarily storing the signals thereof; reading means at said junction for periodically sampling selected registers of at least some of said memory means at a rate at least equal to the highest repetition frequency among the channels assigned to the sampled registers to constitute a composite train of interleaved signals for retransmission over said outgoing path to a remote destination; sensing means in said reading means for detecting the absence of a new signal in a previously sampled register upon resampling thereof and for generating a characteristic pulse in a time slot reserved for the corresponding channel; utilization means at said remote destination for extracting the signals of any channel retransmitted over said outgoing path; and discriminating means at said remote destination responsive to said characteristic pulse for inhibiting said utilization means to prevent the extraction of a spurious signal whereby the retransmitted signals of any channel are extracted at a mean rate corresponding to their original repetition frequency.
Claim 3
Dependent Claim
68 words
The combination defined in claim 1, further comprising first timer means at said junction for controlling the storage of incoming signals in said memory means and second timer means at said junction for controlling the sampling of stored signals to be retransmitted over said outgoing path, said sensing means being responsive to registration pulses from said first timer means and to reading pulses from said second timer means.
Claim 4
Dependent Claim
28 words
The combination defined in claim 2 wherein said sensing means comprises a bistable element for each channel settable by a registration pulse and resettable by a reading pulse.
Claim 5
Dependent Claim
55 words
The combination defined in claim 3 wherein said second timer means has an output in the form of clock pulses establishing a plurality of time positions for code pulses constituting any signal to be retransmitted, said output controlling said sensing means for generating said characteristic pulse in a predetermined time position of a retransmitted signal.
Claim 6
Dependent Claim
75 words
The combination defined in claim 1 wherein said utilization means includes other memory means with a first and a second register for each retransmitted channel and timer means for generating transfer pulses to shift any retransmitted signal from Said first register to said second register upon storage thereof in said first register, said discriminating means being connected to said timer means for inhibiting the generation of a transfer pulse in response to said characteristic pulse.
Claim 7
Dependent Claim
35 words
The combination defined in claim 5 wherein said utilization means further includes decoding means with pulsestoring means forming part of said first register and a load circuit connected in the output of said second register.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |