Patent US3732495A successfully refreshed from Google Patents.
US3732495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal transmission and modulation technique therefor
Assignee: Radiation Inc
•
Filing: 1970-07-20
•
Granted: 1973-05-08
•
Expires: 1990-07-20
Abstract
Abstract Two separate signals are derived as indicative of the information content of each of a plurality of discrete time samples of an input waveform. One of these signals effectively constitutes a stretching of the respective sample, and hence of the input waveform, by designating the deviation of the sample amplitude (or other selected parameter) from an unknown one of a set of discretely increasing reference levels greater in number than two, in a magnified format. The second signal designates the reference level with respect to which the deviation pertains, and thus resolves the ambiguity associated with the first signal. The first and second signals, or an appropriate combination thereof, are impressed on a carrier for transmission to a remote receiving station. Accompanying noise resulting from transmission is compressed in a ratio equal to the ratio of compression of the first signal at the receiving station, to reconstruct the original waveform.
Inventors
- 👤 D Mcrae
- 👤 C Palermo
- 👤 M Pelchat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:00
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/002
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
294 words
Apparatus for transmitting information-bearing electricAl signals over a transmission link, comprising a transmitting station and a receiving station, said transmitting station including means responsive to a signal which bears information as time variations of a preselected parameter of the signal, for deriving from each of selected portions of said signal a respective first electrical value representative of said parameter, said first electrical value extracted from more than two discretely varying values each denoting a gross approximation of said parameter within an expected range of said parameter means for further deriving from each selected portion of said signal a respective second electrical value representative of an expansion of said parameter, said second electrical value extracted from a plurality of continuously varying values denoting amplified potential deviations of said parameter from each of said gross approximations, by which the specific information content of said respective selected signal portion is determinable, and means responsive to each of said derived first and second electrical values for impressing them on a carrier wave in a timed sequence corresponding to the timing sequence of the respective selected signal portions for transmission to said receiving station via said transmission link; and said receiving station including means for effectively detecting the first and second electrical values from said carrier wave in synchronization with said timed sequence and together with accompanying noise resulting from passage via said transmission link, and means responsive to the detected first and second electrical values for a respective portion of said signal for additively combining them to reconstruct said parameter of each portion of the signal in the original sequence, while effectively reducing the detected second electrical value by an amount substantially equal to the amount of said expansion to compress said accompanying noise by a like amount.
Claim 2
Dependent Claim
294 words
Apparatus for transmitting information-bearing electricAl signals over a transmission link, comprising a transmitting station and a receiving station, said transmitting station including means responsive to a signal which bears information as time variations of a preselected parameter of the signal, for deriving from each of selected portions of said signal a respective first electrical value representative of said parameter, said first electrical value extracted from more than two discretely varying values each denoting a gross approximation of said parameter within an expected range of said parameter means for further deriving from each selected portion of said signal a respective second electrical value representative of an expansion of said parameter, said second electrical value extracted from a plurality of continuously varying values denoting amplified potential deviations of said parameter from each of said gross approximations, by which the specific information content of said respective selected signal portion is determinable, and means responsive to each of said derived first and second electrical values for impressing them on a carrier wave in a timed sequence corresponding to the timing sequence of the respective selected signal portions for transmission to said receiving station via said transmission link; and said receiving station including means for effectively detecting the first and second electrical values from said carrier wave in synchronization with said timed sequence and together with accompanying noise resulting from passage via said transmission link, and means responsive to the detected first and second electrical values for a respective portion of said signal for additively combining them to reconstruct said parameter of each portion of the signal in the original sequence, while effectively reducing the detected second electrical value by an amount substantially equal to the amount of said expansion to compress said accompanying noise by a like amount.
Claim 3
Dependent Claim
11 words
The invention according to claim 1, wherein said parameter is amplitude.
Claim 4
Dependent Claim
45 words
The invention according to claim 2, wherein said first means for deriving includes means for quantizing each selected signal portion at a level of an m-ary code grossly representative of the amplitude of the respective signal portion, where m is an integer greater than 2.
Claim 5
Dependent Claim
47 words
The invention according to claim 3, wherein said means for further deriving includes means for calculating the difference between the actual amplitude and the quantized level of the respective signal portion, and means for generating an amplified version of the difference as the respective second electrical value.
Claim 6
Dependent Claim
179 words
Apparatus for transmitting information-bearing electrical signals, comprising means responsive to a signal which bears information as time variations of a preselected parameter of the signal, for deriving from each of selected portions of said signal a respective first electrical value representative of said parameter, said first electrical value extracted from more than two discretely varying values each denoting a gross approximation of said parameter within an expected range of said parameter, means for further deriving from each selected portion of said signal a respective second electrical value representative of an expansion of said parameter, said second electrical value extracted from a plurality of continuously varying values denoting amplified potential deviations of said parameter from each of said gross approximations, by which the specific information content of said respective selected signal portion is determinable, and means responsive to each of said derived first and second electrical values for impressing them on a carrier wave in a timed sequence corresponding to the timing sequence of the respective selected signal portions for transmission to a remote receiving station via said transmission link.
Claim 7
Dependent Claim
179 words
Apparatus for transmitting information-bearing electrical signals, comprising means responsive to a signal which bears information as time variations of a preselected parameter of the signal, for deriving from each of selected portions of said signal a respective first electrical value representative of said parameter, said first electrical value extracted from more than two discretely varying values each denoting a gross approximation of said parameter within an expected range of said parameter, means for further deriving from each selected portion of said signal a respective second electrical value representative of an expansion of said parameter, said second electrical value extracted from a plurality of continuously varying values denoting amplified potential deviations of said parameter from each of said gross approximations, by which the specific information content of said respective selected signal portion is determinable, and means responsive to each of said derived first and second electrical values for impressing them on a carrier wave in a timed sequence corresponding to the timing sequence of the respective selected signal portions for transmission to a remote receiving station via said transmission link.
Claim 8
Dependent Claim
11 words
The invention according to claim 5, wherein said parameter is amplitude.
Claim 9
Dependent Claim
45 words
The invention according to claim 6, wherein said first means for deriving includes means for quantizing each selected signal portion at a level of an m-ary code grossly representative of the amplitude of the respective signal portion, where m is an integer greater than 2.
Claim 10
Dependent Claim
47 words
The invention according to claim 7, wherein said means for further deriving includes means for calculating the difference between the actual amplitude and the quantized level of the respective signal portion, and means for generating an amplified version of the difference as the respective second electrical value.
Claim 11
Dependent Claim
211 words
A signalling system, comprising means responsive to an electrical input signal for sampling the amplitude thereof at timed intervals, means responsive to the amplitude samples for respective quantization thereof at representative ones of a finite number of potential levels greater than two, means responsive to each amplitude sample and to its respective quantization level for generating that one of an infinite number of potential levels representative of the actual difference between the amplitude sample and its quantization level, means responsive to each generated difference level for amplification thereof. means responsive to said quantization levels and said amplified difference levels for modulation of a carrier therewith in accordance with said timed sequence for transmission to a remote receiving terminal, and, at the receiving terminal, means responsive to the modulated carrier for detecting said quantization levels and said amplified difference levels in said timed sequence therefrom, together with accompanying noise resulting from said transmission, and means for compressing said amplified difference level in an inverse ratio to the original amplification thereof to compress said accompanying noise in a like ratio, and means responsive to each quantization level and respective difference level for combining them in said timed sequence to develop a replica of the sequence of amplitude samples for said original input signal.
Claim 12
Dependent Claim
211 words
A signalling system, comprising means responsive to an electrical input signal for sampling the amplitude thereof at timed intervals, means responsive to the amplitude samples for respective quantization thereof at representative ones of a finite number of potential levels greater than two, means responsive to each amplitude sample and to its respective quantization level for generating that one of an infinite number of potential levels representative of the actual difference between the amplitude sample and its quantization level, means responsive to each generated difference level for amplification thereof. means responsive to said quantization levels and said amplified difference levels for modulation of a carrier therewith in accordance with said timed sequence for transmission to a remote receiving terminal, and, at the receiving terminal, means responsive to the modulated carrier for detecting said quantization levels and said amplified difference levels in said timed sequence therefrom, together with accompanying noise resulting from said transmission, and means for compressing said amplified difference level in an inverse ratio to the original amplification thereof to compress said accompanying noise in a like ratio, and means responsive to each quantization level and respective difference level for combining them in said timed sequence to develop a replica of the sequence of amplitude samples for said original input signal.
Claim 13
Dependent Claim
168 words
A transmitter, comprising means for discrete time sampling of an input wave, means responsive to the samples of the input wave for effectively stretching each sample to generate a first signal ambiguously representative of the information content of the respective sample as a magnified deviation from an unknown one of a set of discretely increasing reference levels greater in number than two, means further responsive to the samples of the input wave for selecting a representative one of said levels for each sample and for generating as that level a second signal to resolve the ambiguity associated with the respective first signal, and means responsive to the first and second signals associated with each sample for impressing those signals on a third signal in the timing of the original respective samples, whereby to allow compression of said magnified deviation at a receiving station for said third signal upon resolution of the ambiguity of said first signal by said second signal and thereby compress the amount of accompanying noise.
Claim 14
Dependent Claim
168 words
A transmitter, comprising means for discrete time sampling of an input wave, means responsive to the samples of the input wave for effectively stretching each sample to generate a first signal ambiguously representative of the information content of the respective sample as a magnified deviation from an unknown one of a set of discretely increasing reference levels greater in number than two, means further responsive to the samples of the input wave for selecting a representative one of said levels for each sample and for generating as that level a second signal to resolve the ambiguity associated with the respective first signal, and means responsive to the first and second signals associated with each sample for impressing those signals on a third signal in the timing of the original respective samples, whereby to allow compression of said magnified deviation at a receiving station for said third signal upon resolution of the ambiguity of said first signal by said second signal and thereby compress the amount of accompanying noise.
Claim 15
Dependent Claim
153 words
An information transmission system, comprising means for selectively converting the information-bearing parameter of an information signal into first and second modulation signals, said means including means for expanding said parameter from its original value at a selected segment of said information signal to a new value in a predetermined ratio of expansion, as an enlarged deviation from any of a plurality of distinct and different reference values, and means for assigning to said parameter at said selected segment of the information signal a representative one of said reference values from which said deviation is to be measured; means for applying said first and second modulation signals representative of said enlarged deviation and said representative reference value, respectively, for a plurality of temporAlly spaced selected segments of said information signal, to a carrier signal; and means for transmitting said carrier signal with said first and second modulation signals impressed thereon to a receiving station.
Claim 16
Dependent Claim
153 words
An information transmission system, comprising means for selectively converting the information-bearing parameter of an information signal into first and second modulation signals, said means including means for expanding said parameter from its original value at a selected segment of said information signal to a new value in a predetermined ratio of expansion, as an enlarged deviation from any of a plurality of distinct and different reference values, and means for assigning to said parameter at said selected segment of the information signal a representative one of said reference values from which said deviation is to be measured; means for applying said first and second modulation signals representative of said enlarged deviation and said representative reference value, respectively, for a plurality of temporAlly spaced selected segments of said information signal, to a carrier signal; and means for transmitting said carrier signal with said first and second modulation signals impressed thereon to a receiving station.
Claim 17
Dependent Claim
166 words
The receiving station for the information transmission system according to claim 11 said receiving station comprising means for detecting said first and second modulation signals from said carrier signal, and means for recovering the original information signal from said detected first and second modulation signals, said recovering means including means responsive to said detected second modulation signal for selecting as the representative reference value associated therewith that one of said plurality of reference values closest to the value of the second modulation signal as detected, means responsive to said detected first modulation signal for reducing the value thereof by a ratio inversely corresponding to said ratio of expansion to reduce noise accompanying said detected first modulation signal by approximately the same ratio, and means for additively combining the selected reference value associated with said detected second modulation signal and the reduced value associated with said detected first signal for each respective selected segment in accordance with the temporal spacing thereof to reconstruct the original information signal.
References Cited (Backward Citations)
US2453461A
Cited
US2516587A
Cited
US3163718A
Cited
US3324237A
Cited
US3378641A
Cited
US3484556A
Cited
US3573364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |