US4907217A
Expired / Lapsed
US
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System and method of transmitting a complex waveform over a communication channel utilizing lincompex techniques
Assignee: Amaf Industries Inc
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Filing: 1988-09-12
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Granted: 1990-03-06
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Expires: 2008-09-12
Abstract
Abstract Complex waveforms may be transmitted using Lincompex techniques by frequency shifting either the complex waveform, its envelope, or both, in order to ensure that the compressed complex waveform and the envelope signal are transmitted without any substantial overlap therebetween utilizing Lincompex techniques. Overlap between the compressed waveform and envelope prevents the proper demodulation of the complex waveform from the signal transmitted. Accordingly, the frequency shifting techniques utilized in the present application allow Lincompex techniques to be utilized with complex waveforms having both a large bandwidth and a large envelope bandwidth, for example, the waveforms generated by parallel tone or multi-tone digital data.
Inventors
- 👤 James H. Leveque
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:13
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/62; H04B1/64
Claims Analysis
Total Claims: 60
Claim 1
Independent Claim
90 words
A method of preparing any complex waveform for transmission over a communications channel comprising: (a) developing an envelope signal representative of the envelope of the complex waveform; (b) compressing said complex waveform in proportion to the level of said envelope signal to develop a compressed signal having a predetermined frequency band; (c) developing a control signal from said envelope signal, said control signal having a predetermined control tone band; and (d) shifting the center frequency of one of said predetermined frequency band and control tone band to prevent overlap therebetween.
Claim 2
Independent Claim
90 words
A method of preparing any complex waveform for transmission over a communications channel comprising: (a) developing an envelope signal representative of the envelope of the complex waveform; (b) compressing said complex waveform in proportion to the level of said envelope signal to develop a compressed signal having a predetermined frequency band; (c) developing a control signal from said envelope signal, said control signal having a predetermined control tone band; and (d) shifting the center frequency of one of said predetermined frequency band and control tone band to prevent overlap therebetween.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein both said predetermined frequency band and control tone band are shifted by said step (d) of shifting.
Claim 4
Dependent Claim
44 words
The method of transmitting of claim 1 wherein said step (d) of shifting is performed by frequency shifting said complex waveform to a different frequency so that all frequencies in said predetermined frequency band are separated from any frequencies within said control tone band.
Claim 5
Dependent Claim
44 words
The method of transmitting of claim 1 wherein said step (d) of shifting is performed by frequency shifting said control signal to a different frequency so that all frequencies in said control tone band are separated from any frequencies within said predetermined frequency band.
Claim 6
Dependent Claim
40 words
The method of transmitting of claim 1 wherein said step (d) of shifting is performed by frequency shifting said compressed signal so that all frequencies in said predetermined frequency band are different from any frequencies within said control tone band.
Claim 7
Dependent Claim
15 words
The method of transmitting of claim 3 wherein said frequency shifting is performed by heterodyning.
Claim 8
Dependent Claim
15 words
The method of transmitting of claim 4 wherein said frequency shifting is performed by heterodyning.
Claim 9
Dependent Claim
15 words
The method of transmitting of claim 5 wherein said frequency shifting is performed by heterodyning.
Claim 10
Dependent Claim
32 words
The method of transmitting of claim 6 wherein said heterodyning is performed by multiplying said complex waveform by an oscillation frequency and filtering out the undesired side band formed by the multiplying.
Claim 11
Dependent Claim
30 words
The method of transmitting of claim 7 wherein said heterodyning is performed by multiplying said control signal by an oscillation frequency and filtering out the undesired side band formed thereby.
Claim 12
Dependent Claim
39 words
The method of transmitting of claim 8 wherein said heterodyning is performed by multiplying said compressed signal by an oscillation frequency and filtering out the side band having a band width which would otherwise overlap said control tone band.
Claim 13
Dependent Claim
47 words
The method of claim 1 wherein said envelope signal is a voltage related to the envelope of said complex waveform and wherein said step (c) of developing includes frequency modulating by generating a frequency which varies proportionately to the log of the voltage of said envelope signal.
Claim 14
Dependent Claim
20 words
The method of claim 1 further comprising: (e) transmitting said compressed signal and said control signal over a communication channel.
Claim 15
Dependent Claim
70 words
The method of claim 13 further comprising: (f) receiving said compressed signal and said control signal from said communication channel; (g) decoding said control signal to develop said envelope signal; (h) compensating for said shifting of said step (d) to allow recovery of the complex waveform within said compressed signal; and (i) expanding said compressed signal in proportion to the level of said envelope signal to recover said complex waveform.
Claim 16
Dependent Claim
20 words
The method of claim 3 further comprising: (e) transmitting said compressed signal and said control signal over a communication channel.
Claim 17
Dependent Claim
68 words
The method of claim 15 further comprising: (f) receiving said compressed signal and said control signal from said communication channel; (g) decoding said control signal to develop said envelope signal; (h) expanding said compressed signal in proportion to the level of said envelope signal to recover said frequency shifted complex waveform; and (i) detecting the data directly from said frequency shifted complex waveform by detecting at shifted frequencies.
Claim 18
Dependent Claim
20 words
The method of claim 4 further comprising: (e) transmitting said compressed signal and said control signal over a communication channel.
Claim 19
Dependent Claim
64 words
The method of claim 17 further comprising: (f) receiving said compressed signal and said control signal from said communication channel; (g) frequency shifting said control signal to its original control tone band center frequency; (h) decoding said control signal to develop said envelope signal; and (i) expanding said compressed signal in proportion to the level of said envelope signal to receive said complex signal.
Claim 20
Dependent Claim
20 words
The method of claim 5 further comprising: (e) transmitting said compressed signal and said control signal over a communication channel.
Claim 21
Dependent Claim
63 words
The method of claim 19 further comprising: (f) receiving said compressed signal and said control segment from said communication channel; (g) frequency shifting said compressed signal to its original data frequency band; (h) decoding said control signal to develop said envelope signal; and (i) expanding said compressed signal in proportion to the level of said envelope signal to receive said complex data signal.
Claim 22
Dependent Claim
18 words
The method of claim 1 wherein said complex waveform is parallel-tone or multi-tone data encoded on multiple frequencies.
Claim 23
Dependent Claim
21 words
The method of claim 21 wherein said complex waveform is encoded to form said complex data waveforms by amplitude-shift keying (ASK).
Claim 24
Dependent Claim
17 words
The method of claim 13 wherein said communication channel is a transmission frequency range within the atmosphere.
Claim 25
Dependent Claim
13 words
The method of claim 13 wherein said communication channel is a telephone line.
Claim 26
Dependent Claim
19 words
The method of claim 13 wherein said step of transmitting includes summing said compressed signal and said control signal.
Claim 27
Dependent Claim
50 words
The method of claim 25 wherein said step of transmitting includes modulating the sum of said compressed signal and control signal by a modulation technique selected from the group consisting of amplitude modulation (AM), single side band (SSB), double side band (DSB), vestigial side band (VSB) and frequency modulation (FM).
Claim 28
Independent Claim
92 words
A system for preparing any complex waveform for transmission over a communication channel comprising: envelope detection means for developing an envelope signal representative of the envelope of the complex waveform; compression means for compressing said complex waveform into a compressed signal having a signal frequency band; means for converting said envelope signal into a control tone signal having a frequency which varies with said envelope within a control tone band; means for shifting the center frequency of one of said signal frequency band and said control tone band to prevent overlap therebetween.
Claim 29
Independent Claim
92 words
A system for preparing any complex waveform for transmission over a communication channel comprising: envelope detection means for developing an envelope signal representative of the envelope of the complex waveform; compression means for compressing said complex waveform into a compressed signal having a signal frequency band; means for converting said envelope signal into a control tone signal having a frequency which varies with said envelope within a control tone band; means for shifting the center frequency of one of said signal frequency band and said control tone band to prevent overlap therebetween.
Claim 30
Dependent Claim
25 words
The system of claim 27 wherein said means for converting frequency modulates a control tone within said envelope signal to develop said control tone signal.
Claim 31
Dependent Claim
29 words
The system of claim 27 wherein said means for shifting shifts the center frequency of both said signal frequency band and said control tone band to prevent overlap therebetween.
Claim 32
Dependent Claim
38 words
The system of claim 27 wherein said means for shifting frequency shifts said complex waveform to a different frequency so that all frequencies in said signal frequency band are separated from any frequencies within said control tone band.
Claim 33
Dependent Claim
38 words
The system of claim 27 wherein said means for shifting frequency shifts said constant signal to a different frequency so that all frequencies in said control tone band are separated from any frequencies within said signal frequency band.
Claim 34
Dependent Claim
34 words
The system of claim 27 wherein said means for shifting frequency shifts said compressed signal so that all frequencies in said signal frequency band are separated from any frequencies within said control tone band.
Claim 35
Dependent Claim
18 words
The system of claim 27 wherein said means for shifting the center frequency comprises a heterodyne frequency converter.
Claim 36
Dependent Claim
55 words
The system of claim 30 wherein said means for shifting the center frequency comprises a heterodyne frequency converter including, an oscillator for developing a shift frequency, a multiplex multiplying said complex waveform with said shift frequency to develop sum and difference frequencies, and a filter removing the difference frequency to raise said signal frequency band.
Claim 37
Dependent Claim
55 words
The system of claim 31 wherein said means for shifting the center frequency comprises a heterodyne frequency converter including, an oscillator for developing a shift frequency, a multiplier multiplying said control signal with said shift frequency to develop sum and difference frequencies, and a filter removing the difference frequency to raise said control tone band.
Claim 38
Dependent Claim
59 words
The system of claim 32 wherein said means for shifting the center frequency comprises a heterodyne frequency converter including, an oscillator for developing a shift frequency, a multiplier multiplying said compressed signal with said shift frequency to develop sum and difference frequencies, and a filter removing one of the sum and difference frequencies to frequency shift said compressed signal.
Claim 39
Dependent Claim
26 words
The system of claim 27 further comprising transmitting means, receiving said compressed signal and said control tone signal, for transmitting said signals over a communications channel.
Claim 40
Dependent Claim
17 words
The system of claim 37 further comprising: receiving means for receiving said signals from said communication channel.
Claim 41
Dependent Claim
73 words
The system of claim 38 further comprising: decoder means, operatively connected to said receiver means, for decoding said control signal to develop said envelope signal; data signal recovery means, operatively connected to said receiver means and said decoder means, for expanding said compressed signal in proportion to the level of said envelope signal; and means for compensating for said shifting performed by said means for shifting to allow recovery of said complex waveform.
Claim 42
Dependent Claim
26 words
The system of claim 30 further comprising transmitting means, receiving said compressed signal and said control tone signal, for transmitting said signals over a communications channel.
Claim 43
Dependent Claim
17 words
The system of claim 40 further comprising: receiver means for receiving said signals from said communication channel.
Claim 44
Dependent Claim
90 words
The system of claim 41 wherein said complex waveform signal contains digital data further comprising: decoder means, operatively connected to said receiver means, for decoding said control signal to develop said envelope signal; signal receiving means, operatively connected to said receiver means and said decoder means, for expanding said compressed signal in proportion to the level of said envelope signal to recover said frequency shifted complex waveform signal; and means for detecting said digital data directly from said frequency shifted complex waveform by detecting said data at said shifted frequencies.
Claim 45
Dependent Claim
26 words
The system of claim 31 further comprising transmitting means, receiving said compressed signal and said control tone signal, for transmitting said signals over a communications channel.
Claim 46
Dependent Claim
10 words
The system of claim 43 further comprising: said communication channel.
Claim 47
Dependent Claim
68 words
The system of claim 44 further comprising: mixer means for frequency shifting said control signal to its original control tone band; decoder means, operatively connected to said receiver means, for decoding said control signal to develop said envelope signal; and data signal recovery means, operatively connected to said receiver means and said decoder means, for expanding said compressed signal in proportion to the level of said envelope signal.
Claim 48
Dependent Claim
26 words
The system of claim 31 further comprising transmitting means, receiving said compressed signal and said control tone signal, for transmitting said signals over a communications channel.
Claim 49
Dependent Claim
17 words
The system of claim 46 further comprising: receiver means for receiving said signals from said communication channel.
Claim 50
Dependent Claim
67 words
The system of claim 47 further comprising: mixer means for frequency shifting said compressed signal to its original data frequency band; decoder means, operatively connected to said receiver means, for decoding said control signal to develop said envelope signal; and signal recovery means, operatively connected to said receiver means and said decoder means, for expanding said compressed signal in proportion to the level of said envelope signal.
Claim 51
Dependent Claim
18 words
The system of claim 27 wherein said complex waveform is parallel-tone or multi-tone data encoded on multiple frequencies.
Claim 52
Dependent Claim
20 words
The system of claim 49 wherein said data is encoded to form said complex data waveform by amplitude-shift keying (ASK).
Claim 53
Dependent Claim
17 words
The system of claim 37 wherein said communication channel is a transmission frequency range within the atmosphere.
Claim 54
Dependent Claim
13 words
The system of claim 37 wherein said communications channel is a telephone line.
Claim 55
Dependent Claim
21 words
The system of claim 37 wherein said transmitter means includes a summer for summing said compressed signal and said control signal.
Claim 56
Dependent Claim
53 words
The system of claim 53 wherein said transmitter means further includes a modulator for modulating the sum of said compressed signal and control signal by a modulator technique selected from the group consisting of amplitude modulation (AM), single side band (SSB), double side band (DSB), vestigial side band (VSB) and frequency modulation (FM).
Claim 57
Independent Claim
77 words
A method of preparing any complex signal for transmission to a remote station comprising: developing an envelope signal representative of the envelope of the complex signal; compressing said complex signal into a compressed signal; converting said envelope signal into a frequency modulated control signal having a control tone band; and separating said compressed signal and said control tone band of said control signal to avoid any overlap therebetween which would prevent recovery of the complex signal therefrom.
Claim 58
Independent Claim
77 words
A method of preparing any complex signal for transmission to a remote station comprising: developing an envelope signal representative of the envelope of the complex signal; compressing said complex signal into a compressed signal; converting said envelope signal into a frequency modulated control signal having a control tone band; and separating said compressed signal and said control tone band of said control signal to avoid any overlap therebetween which would prevent recovery of the complex signal therefrom.
Claim 59
Independent Claim
83 words
A system for preparing any complex signal for transmission to a remote station comprising: envelope detection means for developing an envelope signal representative of the envelope of the complex signal; compression means for compressing said complex signal to develop a compressed signal; means for converting said envelope signal into a frequency modulated control signal having a predetermined control tone band; and separating said compressed signal and said control tone band of said control signal to avoid any overlap therebetween which would cause singularities.
Claim 60
Independent Claim
83 words
A system for preparing any complex signal for transmission to a remote station comprising: envelope detection means for developing an envelope signal representative of the envelope of the complex signal; compression means for compressing said complex signal to develop a compressed signal; means for converting said envelope signal into a frequency modulated control signal having a predetermined control tone band; and separating said compressed signal and said control tone band of said control signal to avoid any overlap therebetween which would cause singularities.
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) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |