US3659052A — Multiplex terminal with redundancy reduction

Claim 1

Independent Claim 277 words

A terminal system for interconnecting a plurality of user channels and a transmission channel of limited bandwidth for transmission of telephone voice signals and the like comprising, input processor means connected to said user channels for receiving the analog transmitted user signal on each of said user channels, and for detecting redundancies in the pattern of each of said transmitted user signals, and for applying a transmission signal to said transmission channel including at least a nonredundant portion of each redundant pattern of each of said transmitted user signals and a direction code adapted to communicate the number of repetitions of each such non-redundant portion necessary to produce said redundant patterns, said input processor means including pattern search means for comparing with each other the patterns of each pair of analog signal portions of a group of pairs of adjacent analOg signal portions of each transmitted user signal, the signal portions in each pair being of substantially equal duration, each of said pairs of said group starting at a single reference point in said transmitted user signal, said pattern search means being adapted to identify a pair of said group as a redundant pattern in a transmitted user signal; and output processor means for receipt from said transmission channel of a transmission signal including nonredundant received user signal portions and direction codes associated with each of said user channels, said output processor means being adapted to reconstruct the received user signal associated with each user channel by incorporating the associated non-redundant received user portion repeated as directed by the associated direction codes, and to apply each of said received user signals to the user channel associated therewith.

Claim 2

Dependent Claim 277 words

A terminal system for interconnecting a plurality of user channels and a transmission channel of limited bandwidth for transmission of telephone voice signals and the like comprising, input processor means connected to said user channels for receiving the analog transmitted user signal on each of said user channels, and for detecting redundancies in the pattern of each of said transmitted user signals, and for applying a transmission signal to said transmission channel including at least a nonredundant portion of each redundant pattern of each of said transmitted user signals and a direction code adapted to communicate the number of repetitions of each such non-redundant portion necessary to produce said redundant patterns, said input processor means including pattern search means for comparing with each other the patterns of each pair of analog signal portions of a group of pairs of adjacent analOg signal portions of each transmitted user signal, the signal portions in each pair being of substantially equal duration, each of said pairs of said group starting at a single reference point in said transmitted user signal, said pattern search means being adapted to identify a pair of said group as a redundant pattern in a transmitted user signal; and output processor means for receipt from said transmission channel of a transmission signal including nonredundant received user signal portions and direction codes associated with each of said user channels, said output processor means being adapted to reconstruct the received user signal associated with each user channel by incorporating the associated non-redundant received user portion repeated as directed by the associated direction codes, and to apply each of said received user signals to the user channel associated therewith.

Claim 3

Dependent Claim 93 words

A terminal system as recited in claim 1, wherein said pattern search means is adapted to compare one of said pair of adjacent portions defining a redundant pattern of a transmitted user signal with the next adjacent portion of said transmitted user signal, said next adjacent portion of said transmitted user signal being substantially equal in duration with the portions defining said redundant pattern pair, said pattern search means being further adapted to determine if said redundant pattern pair and said next adjacent portion constitute a redundant pattern of said transmitted user signal.

Claim 4

Dependent Claim 53 words

A terminal system as recited in claim 1, wherein said pattern search means is adapted to identify a pair of said group as a redundant pattern by comparing a plurality of corresponding predetermined points on each of said pair of transmitted user portions, and determining if said points correspond within a predetermined tolerance.

Claim 5

Dependent Claim 186 words

A terminal system as recited in claim 1, including encoder means connected intermediate said user channels and said input processor means for detecting points on the analog transmitted user signal on each of said user channels at which the slope of the curve defining said analog transmitted user signals substantially equals zero and producing a zero-slope sample signal associated with at least some of said points, said zero-slope sample signal including a portion representative of the magnitude of said signal at said point and a portion representative of the time position of said point, said input processor means being adapted to detect redundancies in the pattern of said zero-slope sample signals associated with each user channel, said output processor means being adapted to reconstruct the received user signal associated with each user channel as a series of zero-slope signals; and decoder means connected intermediate said output processor means and said user channels for producing the analog received signal representative of the series of zero-slope signals associated with each user channel and applying the respective analog received user signals thus produced to the user channels associated therewith.

Claim 6

Dependent Claim 152 words

A terminal system as recited in claim 1, including encoder means connected intermediate said user channels and said input processor means for sequentially sampling the analog transmitted signal on each of said user channels to produce a series of analog sample signals and for producing a digital sample signal representative of each of said analog sample signals, said input processor means being adapted to detect redundancies in the pattern of digital sample signals associated with each user channel, said output processor means being adapted to reconstruct the received user signal associated with each user channel as a sequential series of digital sample signals; and decoder means connected intermediate said output processor means and said user channels for producing an analog sample signal representative of each of the digital sample signals received from the output processor means and sequentially applying the respective analog sample signals thus produced to The user channel associated therewith.

Claim 7

Dependent Claim 85 words

A terminal system as recited in claim 5, including digital to analog converter means intermediate said input processor means and said transmission channel for converting the digital sample signals of each non-redundant transmitted user signal to analog form for incorporating in the transmission signal; and analog to digital converter means intermediate said transmission channel and said output processor means for converting each analog non-redundant received user signal portions from said transmission line to a series of digital samples for application to said output processor means.

Claim 8

Dependent Claim 50 words

A terminal system as recited in claim 1, wherein the transmission signal produced by said input processor means is divided into a plurality of time slots sequentially assigned to each of said user channels for the transmission therein of the associated non-redundant portions of each redundant pattern and direction codes.

Claim 9

Dependent Claim 139 words

A terminal system as recited in claim 1, wherein said input processor means is adapted to produce a transmission signal divided into a plurality of time slots, and including address data associated with each non-redundant transmitted user signal portion for identifying the destination of said signal portion, said non-redundant transmitted user signal portions and associated address data being randomly assigned to said transmission signal time slots; said output processor means being adapted to receive a transmission signal including non-redundant received user signal portions and associated address data identifying the user channel to which the latter signal portions are directed in randomly assigned time slots, said output processor means further being adapted to repeat each non-redundant received user signal portion associated with one of said user channel until the next such signal portion associated with that user channel is received.

Claim 10

Dependent Claim 28 words

A terminal system as recited in claim 1, wherein said input and output processor means include buffer memory means for storage of user signal portions during operations thereon.

Claim 11

Dependent Claim 78 words

A terminal system according to claim 1, including dial and ringing circuit means connected to said plurality of user channels for applying ringing signals thereto and receiving dial signals therefrom, said input processor means being connected to said dial and ringing circuit means for detecting said dial signal and applying same to said transmission channel, said output processor means being connected to said dial and ringing circuit means for applying thereto ringing signals received from said transmission channel.

Claim 12

Dependent Claim 16 words

A terminal system according to claim 1, wherein said user and transmission channels are telephone lines.

Claim 13

Dependent Claim 202 words

In a terminal system for interconnecting a plurality of user channels and a transmission channel of limited bandwidth for transmission of telephone voice signals and the like, a transmission device comprising input processor means connected to said user channels for receiving the analog transmitted user signals on each of said user channels, and for detecting redundancies in the pattern of each said transmitted user signal, and for applying a transmission signal to said transmission channel including at least a non-redundant portion of each redundant pattern of each of said transmitted user signals and a direction code adapted to communicate the number of repetitions of each such non-redundant portions necessary to reproduce said redundant patterns, said input processor means including pattern search means for comparing with each other the patterns of each pair of analog signal portions of a group of pairs of adjacent analog signal portions of each transmitted user signal, the signal portions in each pair being of substantially equal duration, each of said pairs in said group starting at a single reference point in said transmitted user signal, said pattern search means being adapted to identify a pair of said group as a redundant pattern in a transmitted user signal.

Claim 14

Dependent Claim 202 words

In a terminal system for interconnecting a plurality of user channels and a transmission channel of limited bandwidth for transmission of telephone voice signals and the like, a transmission device comprising input processor means connected to said user channels for receiving the analog transmitted user signals on each of said user channels, and for detecting redundancies in the pattern of each said transmitted user signal, and for applying a transmission signal to said transmission channel including at least a non-redundant portion of each redundant pattern of each of said transmitted user signals and a direction code adapted to communicate the number of repetitions of each such non-redundant portions necessary to reproduce said redundant patterns, said input processor means including pattern search means for comparing with each other the patterns of each pair of analog signal portions of a group of pairs of adjacent analog signal portions of each transmitted user signal, the signal portions in each pair being of substantially equal duration, each of said pairs in said group starting at a single reference point in said transmitted user signal, said pattern search means being adapted to identify a pair of said group as a redundant pattern in a transmitted user signal.

Claim 15

Dependent Claim 54 words

A terminal system as recited in claim 12, wherein said pattern search means is adapted to identify a pair of said groups as a redundant pattern by comparing a plurality of corresponding predetermined points on each of said pair of transmitted user signal portions, and determining if said points correspond within a predetermined tolerance.

Claim 16

Dependent Claim 116 words

A terminal system as recited in claim 12, including encoder means connected intermediate said user channels and said input processor means for detecting points on the analog transmitted user signal on each of said user channels at which the slope of the curve defining said analog transmitted user signals substantially equals zero and producing a zero-slope sample signal associated with at least some of said points, said zero-slope sample signal including a portion representative of the magnitude of said signal at said point and a portion representative of the time position of said point, said input processor means being adapted to detect redundancies in the pattern of said zero-slope sample signals associated with each user channel.

Claim 17

Dependent Claim 143 words

In a terminal system for interconnecting a plurality of user channels and a transmission channel of limited bandwidth for transmission of telephone voice signals and the like, a receiver device comprising output processor means for receipt from said transmission channel of a transmission signal including non-redundant received user signal portions and direction codes associated with each of said user channels, said received user signal portions being analog pattern segments of a sound signal, said output processor means including means for reconstructing the received user signal associated with each user channel by digitizing the associated non-redundant received user signal portion, means for repeating the digitized non-redundant received user signal portions as directed by the associated direction codes to produce an intermediate digital signal and means for converting the intermediate digital signal to an analog user signal for application to the user channel associated therewith.

Claim 18

Dependent Claim 143 words

In a terminal system for interconnecting a plurality of user channels and a transmission channel of limited bandwidth for transmission of telephone voice signals and the like, a receiver device comprising output processor means for receipt from said transmission channel of a transmission signal including non-redundant received user signal portions and direction codes associated with each of said user channels, said received user signal portions being analog pattern segments of a sound signal, said output processor means including means for reconstructing the received user signal associated with each user channel by digitizing the associated non-redundant received user signal portion, means for repeating the digitized non-redundant received user signal portions as directed by the associated direction codes to produce an intermediate digital signal and means for converting the intermediate digital signal to an analog user signal for application to the user channel associated therewith.

Claim 19

Dependent Claim 128 words

A terminal system as recited in claim 15, wherein said output processor means is adapted to reconstruct the received user signal associated with each user channel as a series of zero-slope signals, each zero-slope signal including a portion representative of the magnitude of an analog signal at a point at which the slope of the curve defining said analog signal substantially equals zero and a portion representative of the time position of said point in said signal, said terminal system including decoder means connected intermediate said output processor means and said user channels for producing the analog received user signal representative of the series of zero-slope signals associated with each user channel and applying the respective analog received user signals thus produced to the user channels associated therewith.

Claim 20

Dependent Claim 103 words

A terminal system as recited in claim 15, wherein said output processor means is adapted to reconstruct the received user signal as associated with each user channel as a sequential series of digital sample signals, each digital sample signal being disposed in a time slot assigned to the associated user channel, said terminal system including decoder means connected intermediate said output processor means and said user channels for producing an analog sample signal representative of each of the digital sample signals received from the output processor means and sequentially applying the respective analog sample signals thus produced to the user channel associated therewith.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-04-25	1975-10-25	1976-04-25	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-04-25	1979-10-25	1980-04-25	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-04-25	1983-10-25	1984-04-25	$7700.00	Window Closed / Lapsed

Multiplex terminal with redundancy reduction

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