US3729678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pcm system including a pulse pattern analyzer
Assignee: US Philips Corp
•
Filing: 1971-07-20
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Granted: 1973-04-24
•
Expires: 1991-07-20
Abstract
Abstract A delta pulse code modulation system includes a feedback loop comprising a pulse pattern analyzer for detecting a large instantaneous modulation index within a fixed time interval. The system exhibits a wide range of modulation and suppresses whistling and interference tones at low pulse rates.
Inventors
- 👤 Den Enden A Van
- 👤 J Glasbergen
- 👤 J Greefkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:34
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/02; H04B14/06; H04B14/062; H04B14/064
Claims Analysis
Total Claims: 64
Claim 1
Independent Claim
271 words
A transmitter system comprising a pulse code modulator for producing an output pulse signal, a pulse generator, means to couple said pulse generator to said pulse code modulator, a pulse pattern analyzer, means to couple the output signal of said pulse code modulator to said pulse pattern analyzer, said pulse pattern analyzer successively analyzing the instantaneous modulation index of pulse patterns in said output signal of said pulse code modulator over a time interval of at least 3 successive pulses from said pulse generator and producing an output signal only upon the occurence of pulse patterns with an instantaneous modulation index exceeding a predetermined value of at least half the maximum instantaneous modulation index within said time interval, a first integrating network coupled to the output signal of said pulse pattern analyzer for providing a control signal, control means for varying the energy content of said output signal of said pulse code modulator directly as a function of said control signal, means to couple said output signal of said pulse code modulator and said control signal to said control means, a comparison system having two input means and an output means, the comparison system comprising a second integrating network and a difference producer, means to couple the output of said control means to one of said comparison system input means, means to couple said comparison system output means to said pulse code modulator, means to couple an input signal to said transmitter to the other of said comparison system input means, and means for deriving said output signal from said pulse code modulator as an output signal of said transmitter system.
Claim 2
Dependent Claim
271 words
A transmitter system comprising a pulse code modulator for producing an output pulse signal, a pulse generator, means to couple said pulse generator to said pulse code modulator, a pulse pattern analyzer, means to couple the output signal of said pulse code modulator to said pulse pattern analyzer, said pulse pattern analyzer successively analyzing the instantaneous modulation index of pulse patterns in said output signal of said pulse code modulator over a time interval of at least 3 successive pulses from said pulse generator and producing an output signal only upon the occurence of pulse patterns with an instantaneous modulation index exceeding a predetermined value of at least half the maximum instantaneous modulation index within said time interval, a first integrating network coupled to the output signal of said pulse pattern analyzer for providing a control signal, control means for varying the energy content of said output signal of said pulse code modulator directly as a function of said control signal, means to couple said output signal of said pulse code modulator and said control signal to said control means, a comparison system having two input means and an output means, the comparison system comprising a second integrating network and a difference producer, means to couple the output of said control means to one of said comparison system input means, means to couple said comparison system output means to said pulse code modulator, means to couple an input signal to said transmitter to the other of said comparison system input means, and means for deriving said output signal from said pulse code modulator as an output signal of said transmitter system.
Claim 3
Dependent Claim
26 words
A transmitter system as claimed in claim 1 wherein said control means comprises means to suppress a varying direct current component from said pulse pattern analyzer.
Claim 4
Dependent Claim
30 words
A transmitter system as claimed in claim 1, wherein said pulse code modulator outputs a second signal having complementary pulses to said first output signal from said pulse code modulator.
Claim 5
Dependent Claim
66 words
A transmitter system as claimed in claim 3, wherein said control means comprises two modulators coupled to said first and said second output signals from said pulse code modulator pulse respectively and a second difference producer is coupled to respective outputs of said two modulators, said pulse pattern analyzer output signal being a pulse, said two modulators being responsive to said pulse pattern analyzer pulse signal.
Claim 6
Dependent Claim
18 words
A transmitter system as claimed in claim 1 wherein said pulse pattern analyzer comprises means for counting pulses.
Claim 7
Dependent Claim
19 words
A transmitter system as claimed in claim 1, wherein said pulse pattern analyzer is coupled to said pulse generator.
Claim 8
Dependent Claim
37 words
A transmitteR system as claimed in claim 1, wherein said pulse pattern analyzer further comprises a second pulse generator having output pulses to constant duration and amplitude and being responsive to pulses from said first pulse generator.
Claim 9
Dependent Claim
29 words
A transmitter system as claimed in claim 1, wherein said means to couple said first integrating network to said control means comprises an amplifier having an exponential amplification characteristics.
Claim 10
Dependent Claim
17 words
A transmitter system as claimed in claim 1, wherein said control means comprises at least one modulator.
Claim 11
Dependent Claim
17 words
A transmitter system as claimed in claim 1, wherein said pulse pattern analyzer comprises a pulse counter.
Claim 12
Dependent Claim
106 words
A transmitter system as claimed in claim 10, wherein said pulse counter comprises a first AND gate having input and output means coupled to said pulse generator, a second AND gate having input and output means to provide gating of output pulse signals from said pulse counter, an inverter connected from one of the output means to said second AND gate to one of the input means of said first AND gate, and two bistable triggers interconnected to operate as a two-to-one divider coupled between one of the output means of said first AND gate and one of the input means of said second AND gate.
Claim 13
Dependent Claim
43 words
A transmitter system as claimed in claim 10, wherein said pulse counter comprises a capacitor having a charging voltage, a constant supply voltage for charging said capacitor, a constant reference voltage, and means to compare said charging voltage with said constant reference voltage.
Claim 14
Dependent Claim
37 words
A transmitter system as claimed in claim 10, wherein said pulse pattern analyzer further comprises a reset device coupled to said output signal of said switch device, said reset device supplying reset signals for said pulse counter.
Claim 15
Dependent Claim
41 words
A transmitter system as claimed in claim 13, wherein said reset device comprises a bistable element coupled to said switch device, a differentiator coupled to said bistable element, and a full wave rectifier coupled between said differentiator and said pulse counter.
Claim 16
Dependent Claim
22 words
A transmitter system as claimed in claim 13, wherein said reset device comprises a normally off transistor controlled by said switch device.
Claim 17
Dependent Claim
102 words
A transmitter system as claimed in claim 1, wherein said pulse pattern analyzer comprises a shift register having a plurality of serially coupled shift register elements, means to couple said output pulses from said switch device to said shift register, a plurality of AND gates each having a plurality of input means and an output means coupled to selected shift register elements, and an OR gate coupled to said AND gate output means, said OR gate providing a pulse signal for selected states of said shift register elements, said OR gate output signal being the output signal of said pulse pattern analyzer.
Claim 18
Dependent Claim
32 words
A transmitter system as claimed in claim 16, wherein said shift register elements each have complementary output signals and said complementary output signals are coupled to a second plurality of AND gates.
Claim 19
Dependent Claim
71 words
A transmitter system as claimed in claim 1, further comprising a shift register having at least one shift register element, said shift register coupled to said pulse pattern analyzer and to said pulse generator, and an OR gate having a plurality of input means and an output means, said OR gate input means coupled to said shift register elements and said OR gate output means coupled to said first integrating network.
Claim 20
Dependent Claim
95 words
A transmitter system as claimed in claim 13, wherein said pulse counter comprises a first ring counter having an output means and said pulse pattern analyzer further comprises a second ring counter having an input means coupled to said pulse generator, an input means of said reset device coupled to said first counter output means, said first integrating network comprising a forward backward counter having forward and backward inputs coupled to said outputs of said first and said second ring counters respectively, and a resistoR network coupling said forward-backward counter to said first integrating network.
Claim 21
Dependent Claim
152 words
A transmitter system as claimed in claim 1, wherein said pulse code modulator provides a second output pulse series having a complementary relationship with the pulses of the first output signal from said pulse code modulator, said control means having input means coupled to receive said first and second output signals from said pulse code modulator, and control input means coupled to receive said control signal from said first integrating network, comprising modulating means and combining means coupled with said modulating means for producing modulated output pulses of a first polarity in response to said first output signal from said pulse code modulator and for producing modulated output pulses of a polarity opposite to that of said first polarity in response to said second output signal from said pulse code modulator, whereby the energy content of the modulated output pulses of said control means increasing control signal from said first integrating network.
Claim 22
Dependent Claim
129 words
A transmitter system as claimed in claim 1, wherein said pulse pattern analyzer comprises a scale of n pulse counter producing an output pulse signal, where N is an integer greater than two, an and-gate coupled between said pulse generator and said pulse counter, means to couple said output signal from said pulse counter as an inhibit signal to said and-gate, and means to couple pulses of one type in said output signal from said pulse code modulator as reset pulses to said pulse counter, whereby said pulse counter produces an output pulse signal only upon the occurrence of n successive pulses of the other type in said output signal from said pulse code modulator, said pulse counter output signal being the output signal of said pulse pattern analyzer.
Claim 23
Dependent Claim
138 words
A transmitter system as claimed in claim 1, wherein said pulse pattern analyzer comprises a scale of n pulse counter producing an output pulse signal, where n is an integer greater than two, an and-gate coupled between said pulse generator and said pulse, counter, means to couple said output signal from said pulse counter as an inhibit signal to said and-gate, and reset means coupled to said pulse code modulator for producing a reset pulse for said pulse counter in response to the occurrence of a pulse reversal in said output signal from said pulse code modulator, whereby said pulse counter produces an output pulse signal only upon the occurrence of n successive equal pulses in said output signal from said pulse code modulator, said pulse counter output signal being the output signal of said pulse pattern analyzer.
Claim 24
Dependent Claim
44 words
A transmitter system as claimed in claim 22, wherein said reset means comprises a bistable element coupled to said pulse code modulator, a differentiating network coupled to said bistable element, and a full wave rectifier coupled between said differentiating network and said pulse counter.
Claim 25
Dependent Claim
193 words
A transmitter system as claimed in claim 1, wherein said pulse pattern analyzer comprises a capacitor having a charging voltage, a source of constant supply voltage for charging said capacitor, discharge means coupled to said capacitor being responsive to reset pulses, a source of constant reference voltage at least equal to said charging voltage at the end of a time interval of n successive pulses of said pulse generator, where n is an integer greater than unity, comparison means coupled to receive said charging voltage and said constant reference voltage for producing an output signal when said charging voltage exceeds said constant reference voltage, pulse regenerator means having output pulses of constant amplitude and being responsive to the output signal of said comparison means, and means to couple pulses of one type in said putput signal from said pulse code modulator as reset pulses to said discharge means, whereby said pulse regenerator means produces an output pulse signal only upon the occurrence of (n+1) succeSsive pulses of the other type in said output signal from said pulse code modulator; said pulse regenerator output signal being the output signal of said pulse pattern analyzer.
Claim 26
Dependent Claim
202 words
A transmitter system as claimed in claim 1, wherein said pulse pattern analyzer comprises a capacitor having a charging voltage, a source of constant supply voltage for charging said capacitor, discharge means coupled to said capacitor being responsive to reset pulses, a source of constant reference voltage at least equal to said charging voltage at the end of a time interval of n successive pulses of said pulse generator, where n is an integer greater than unity, comparison means coupled to receive said charging voltage and said constant reference voltage for producing an output signal when said charging voltage exceeds said constant reference, voltage, pulse regenerator means having output pulses of constant amplitude and being responsive to the output signal of said comparison means, and reset means coupled to said pulse code modulator for producing a reset pulse for said discharge means in response to the occurrence of a pulse reversal in said output signal from said pulse code modulator, whereby said pulse regenerator means produces an output pulse signal only upon the occurrence of (n+1) successive equal pulses in said output signal from said pulse code modulator, said pulse regenerator output signal being the output signal of said pulse pattern analyzer.
Claim 27
Dependent Claim
44 words
A transmitter system as claimed in claim 25, wherein said reset means comprises a bistable element coupled to said pulse code modulator, a differentiating network coupled to said bistable element, and a full wave rectifier coupled between said differentiating network and said discharge means.
Claim 28
Dependent Claim
85 words
A transmitter system as claimed in claim 1, wherein said pulse pattern analyzer comprises a shift register having a shift input coupled to said pulse generator and at least three serially coupled shift register elements, means to couple said output signal from said pulse code modulator to said shift register, at least one and-gate having at least three input means and an output means coupled to said shift register elements, and output coupling means to couple said and-gate output means to said first integrating network.
Claim 29
Dependent Claim
86 words
A transmitter system as claimed in claim 27, wherein said shift register element each have complementary outputs, said pulse pattern analyzer further comprising at least a second and-gate having at least three input means and an output means coupled to said complementary outputs, said output coupling means comprising an or-gate coupled to said first and second and-gate output means, said or-gate providing a pulse signal for selected states of said shift register elements, said or-gate output signal being the output signal of said pulse pattern analyzer.
Claim 30
Dependent Claim
64 words
A transmitter system as claimed in claim 1, further comprising a shift register having at least one shift register element, said shift register being coupled to said pulse pattern analyzer and said pulse generator, and an or-gate having at least two input means and an output means coupled to said shift register elements, said or-gate output means being coupled to said first integrating network.
Claim 31
Dependent Claim
226 words
A receiver system comprising a switch device for producing an output pulse signal, means to couple an input signal to said receiver system to said switch device, a pulse generator synchronized to said input signal to said receiver system, means to couple said pulse generator to said switch device, a pulse pattern analyzer, means to couple said switch device to said pulse pattern analyzer, said pulse pattern analyzer successively analyzing the instantaneous modulation index of pulse patterns in said output signal of said switch device over a time interval of at least three successive pulses from said pulse generator and producing an output signal only upon the occurence of pulse patterns with an instantaneous modulation index exceeding a predetermined value of at least half the maximum instantaneous modulation index within said time interval, an integrating network coupled to the output signal of the pulse pattern analyzer for providing a control signal, control means for varying the energy content of said output signal of said switch device directly as a function of said control signal, means to couple said output signal of said switch device and said control signal and said control means, a smoothing network, means to couple the output of said control means to said smoothing network, and means for deriving an output signal from said smoothing network as an output from said receiver system.
Claim 32
Dependent Claim
226 words
A receiver system comprising a switch device for producing an output pulse signal, means to couple an input signal to said receiver system to said switch device, a pulse generator synchronized to said input signal to said receiver system, means to couple said pulse generator to said switch device, a pulse pattern analyzer, means to couple said switch device to said pulse pattern analyzer, said pulse pattern analyzer successively analyzing the instantaneous modulation index of pulse patterns in said output signal of said switch device over a time interval of at least three successive pulses from said pulse generator and producing an output signal only upon the occurence of pulse patterns with an instantaneous modulation index exceeding a predetermined value of at least half the maximum instantaneous modulation index within said time interval, an integrating network coupled to the output signal of the pulse pattern analyzer for providing a control signal, control means for varying the energy content of said output signal of said switch device directly as a function of said control signal, means to couple said output signal of said switch device and said control signal and said control means, a smoothing network, means to couple the output of said control means to said smoothing network, and means for deriving an output signal from said smoothing network as an output from said receiver system.
Claim 33
Dependent Claim
33 words
A receiver system as claimed in claim 30, wherein said second integrating network comprises a low pass filter having a cut-off frequency in the order of low frequencies of the modulation index variations.
Claim 34
Dependent Claim
35 words
A receiver system as claimed in claim 31, wherein said second integrating network further comprises a second low pass filter having a cut-off frequency greater than said cut-off frequency of said first low pass filter.
Claim 35
Dependent Claim
40 words
A receiver system as claimed in claim 30, wherein said pulse pattern analyzer further comprises a second pulse generator having an output pulse signal of constant duration and amplitude and being responsive to pulse signals from said first pulse generator.
Claim 36
Dependent Claim
29 words
A receiver system as claimed in claim 30, wherein said means to couple said first integrating network to said feedback means comprises an amplifier having an exponential amplification characteristics.
Claim 37
Dependent Claim
25 words
A receiver system as claimed in claim 30, wherein said feedback means comprises means to suppress a varying direct current from said pulse pattern analyzer.
Claim 38
Dependent Claim
28 words
A receiver system as claimed in claim 1, wherein said switch device outputs a second signal having complementary pulses to said first output signal from said switch device.
Claim 39
Dependent Claim
17 words
A receiver system as claimed in claim 30, wherein said feedback means comprises at least one modulator.
Claim 40
Dependent Claim
63 words
A receiver system as claimed in claim 36, wherein said feedback means comprises two modulators coupled to said first and said second output signals from said switch device respectively and a difference producer is coupled to output means of the two modulators, said pulse pattern analyzer output signal being a pulse, said two modulators being responsive to said pulse pattern analyzer pulse signal.
Claim 41
Dependent Claim
17 words
A receiver system as claimed in claim 1, wherein said pulse pattern analyzer comprises a pulse counter.
Claim 42
Dependent Claim
97 words
A receiver system as claimed in claim 39, wherein said pulse counter comprises a first AND gate having an input and output coupled to said pulse generator, a second AND gate having input and output means to provide an output pulse signal from said pulse counter, an inverter connected from the output means of said second AND gate to the input means of said first AND gate, and two bistable triggers interconnected to operate as a two-to-one divider coupled between the output means of said first AND gate and the input means of said second AND gate.
Claim 43
Dependent Claim
43 words
A receiver system as claimed in claim 39, wherein said pulse counter comprises a capacitor having a charging voltage, a constant supply voltage for charging said capacitor, a constant reference voltage, and means to compare said charging voltage with said constant reference voltage.
Claim 44
Dependent Claim
38 words
A receiver system as claimed in claim 39, wherein said pulse pattern analyzer further comprises a reset device coupled to said first output signal from said switch device, said reset device supplying reset pulses for said pulse counter.
Claim 45
Dependent Claim
41 words
A receiver system as claimed in claim 42, wherein said reset device comprises a bistable element coupled to said switch device, a differentiator coupled to said bistable element, and a full wave rectifier coupled between said differentiator and said pulse counter.
Claim 46
Dependent Claim
22 words
A receiver system as claimed in claim 42, wherein said reset device comprises a normally off transistor controlled by said switch deviCe.
Claim 47
Dependent Claim
103 words
A receiver system as claimed in claim 30, wherein said pulse pattern analyzer comprises a shift register having a plurality of serially coupled shift register elements, means to couple said output pulses from said switch device to said shift register, a plurality of AND gates each having a plurality of input means and an output means coupled to selected shift register elements, and a OR gate coupled to said AND gate output means, said OR gate providing an output pulse signal for selected states of said shift register elements, said OR gate output signal being the output signal of said pulse pattern analyzer.
Claim 48
Dependent Claim
31 words
A receiver as claimed in claim 45, wherein said shift register elements each have complementary output signals and said complementary output signals are coupled to a second plurality of AND gates.
Claim 49
Dependent Claim
53 words
A receiver as claimed in claim 30, further comprising a shift register having at least one shift register element, said shift register coupled to said pulse pattern analyzer and to said pulse generator, and an OR gate having a plurality of input means and an output means coupled to said first integrating network.
Claim 50
Dependent Claim
107 words
A receiver as claimed in claim 42, wherein said pulse counter comprises a first ring counter having an output means and said pulse pattern analyzer further comprises a second ring counter having an input means coupled to said pulse generator, an input means of said reset device coupled to said pulse generator, an input means of said reset device coupled to said first counter output means, said first integrating network comprising a forward-backward counter having forward and backward input means coupled to said output means of said first and said second ring counters respectively, and a resistor network coupling said forward-backward counter to said first integrating network.
Claim 51
Dependent Claim
115 words
A transmitter system as claimed in claim 1, wherein said pulse pattern analyzer comprises a first ring counter having an output means coupled to said pulse generator, reset means coupled to said pulse code modulator for producing reset pulse for said first ring counter, a second ring counter having an output means coupled to said pulse generator, and means coupled to said output of said first ring counter for producing reset pulses for said second ring counter, said first integrating network comprising a forward-backward counter having forward and backward inputs coupled to said outputs of said first and said second ring counters respectively, and a resistor network coupling said forward-backward counter to said control means.
Claim 52
Dependent Claim
61 words
A transmitter system as claimed in claim 1, wherein said means coupling said first integrating network to said control means comprises a source of constant reference signal, and combination means for combining said control signal and said constant reference signal for controlling the energy content of said output signal of said pulse code modulator in the absence of said control signal.
Claim 53
Dependent Claim
131 words
A receiver system as claimed in claim 30, wherein said switch device outputs a second pulse signal having complementary pulses to said first output signal from said switch device, said control means having input means coupled to receive said first and second output signals from said switch device and control input means coupled to receive said control signal from said integrating network, comprising modulating means and combining means coupled with said modulating means, for producing modulated output pulses of one polarity in response to said first output signal from said switch device and of the other polarity in response to said second output signal from said switch device so that the energy content of the modulated output pulses of said control means increases with increasing control signal from said integrating network.
Claim 54
Dependent Claim
127 words
A receiver system as claimed in claim 30, wherein said pulse pattern analyzer comprises a scale of n pulse counter producing an output pulse signal, where n is an integer greater than two, and And-gate coupled between said pulse generator and said pulse counter, means to couple said output signal from said pulse counter as an inhibit signal to said and-gate, and means to couple pulses of one type in said output signal from said switch device as reset pulses to said pulse counter, whereby said pulse counter produces an output pulse signal only upon the occurrence of n successive pulses of the other type in said output signal from said switch device, said pulse counter output signal being the output signal of said pulse pattern analyzer.
Claim 55
Dependent Claim
134 words
A receiver system as claimed in claim 30, wherein said pulse pattern analyzer comprises a scale of n pulse counter producting an output signal, where n is an integer greater than two, an and-gate coupled between said pulse generator and said pulse counter, means to couple said output signal from said pulse counter as an inhibit signal to said and-gate, and reset means coupled to said switch device for producing a reset pulse for said pulse counter in response to the occurrence of a pulse reversal in said output signal from said switch device, whereby said pulse counter produces an output pulse signal only upon the occurrence of n successive equal pulses in said output signal from said switch device, said pulse counter output signal being the output signal of said pulse pattern analyzer.
Claim 56
Dependent Claim
43 words
A receiver system as claimed in claim 53, wherein said reset means comprises a bistable element coupled to said switch device, a differentiating network coupled to said bistable element, and a full wave rectifier coupled between said differentiating network and said pulse counter.
Claim 57
Dependent Claim
191 words
A receiver system as claimed in claim 30, wherein said pulse pattern analyzer comprises a capacitor having a charging voltage, a source of constant supply voltage for charging said capacitor, discharge means coupled to said capacitor being responsive to reset pulses, a source of constant reference voltage at least equal to said charging voltage at the end of a time interval of n successive pulses of said pulse generator, where n is an integer greater than unity, comparison means coupled to receive said charging voltage and said constant reference voltage for producing an output signal when said charging voltage exceeds said constant reference voltage, pulse regenerator means having output pulses of constant amplitude and being responsive to the output signal of said comparison means, and means to couple pulses of one type in said output signal from said switch device as reset pulses to said discharge means, whereby said pulse regenerator means produces an output pulse signal only upon the occurrence of (n+1) successive pulses of the other type in said output signal from said switch device; said pulse regenerator output signal being the output signal of said pulse pattern analyzer.
Claim 58
Dependent Claim
200 words
A receiver system as claimed in claim 30, wherein said pulse pattern analyzer comprises a capacitor having a charging voltage, a source of constant supply voltage for charging said capacitor, discharge means coupled to said capacitor being responsive to reset pulses, a source of constant reference voltage at least equal to said changing voltage at the end of a time interval of n successive pulses of said pulse generator, where n is an integer greater than unity, comparison means coupled to receive said charging voltage and said constant reference voltage for producing an output signal when said charging voltage exceeds said constant reference voltage, pulse regenerator means having output pulses of constant amplitude and being responsive to the output signal of said comparison means, and reset means coupled to said switch device for producing a reset pulse for said discharge means in response to the occurrence of a pulse reversal in said output signal from said pulse code modulator, whereby said pulse regenerator means produces an output pulse signal only upon the occurrence of (n+1) successive equal pulseS in said output signal from said switch device, said pulse regenerator output signal being the output signal of said pulse pattern analyzer.
Claim 59
Dependent Claim
43 words
A receiver system as claimed in claim 56, wherein said reset means comprises a bistable element coupled to said switch device, a differentiating network coupled to said bistable element, and a full wave rectifier coupled between said differentiating network and said discharge means.
Claim 60
Dependent Claim
83 words
A receiver system as claimed in claim 30, wherein said pulse pattern analyzer comprises a shift register having a shift input coupled to said pulse generator and at least three serially coupled shift register elements, means to couple said output signal from said switch device to said shift register, at least one and-gate having at least three input means and an output means coupled to said shift register elements, and output coupling means to couple said and-gate output means to said integrating network.
Claim 61
Dependent Claim
86 words
A receiver system as claimed in claim 58, wherein said shift register elements each have complementary outputs, said pulse pattern analyzer further comprising at least a second and-gate having at least three input means and an output means coupled to said complementary outputs, said output coupling means comprising an or-gate coupled to said first and second and-gate output means, said or-gate providing a pulse signal for selected states of said shift register elements, said or-gate output signal being the output signal of said pulse pattern analyzer.
Claim 62
Dependent Claim
63 words
A receiver system as claimed in claim 30, further comprising a shift register having at least one shift register element, said shift register being coupled to said pulse pattern analyzer and said pulse generator, and an or-gate having at least two input means and an output means coupled to said shift register elements, said or-gate output means being coupled to said integrating network.
Claim 63
Dependent Claim
113 words
A receiver system as claimed in claim 30, wherein said pulse pattern analyzer comprises a first ring counter having an output means coupled to said pulse generator, reset means coupled to said switch device for producing reset pulses for said first ring counter, a second ring counter having an output means coupled to said pulse generator, and means coupled to said output of said first ring counter for producing reset pulses for said second ring counter, said integrating network comprising a forward-backward counter having forward and backward inputs coupled to said outputs of said first and said second ring counters respectively, and a resistor network coupling said forward-backward counter to said control means.
Claim 64
Dependent Claim
59 words
A receiver system as claimed in claim 30, wherein said means coupling said integrating network to said control means comprises a source of constant reference signal, and combination means for combining said control signal and said constant reference signal for controlling the energy content of said output signal of said switch device in the absence of said control signal.
References Cited (Backward Citations)
US3555423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |