Patent US3806810A successfully refreshed from Google Patents.
US3806810A
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Reference signal generator for pulse code modulation
Assignee: US Philips Corp
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Filing: 1972-02-15
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Granted: 1974-04-23
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Expires: 1992-02-15
Abstract
Abstract A reference signal generator for use in the encoder and/or decoder of a pulse code modulation information transmission system with non-uniform coding, for the simultaneous generation of sequences of signal elements having quantized amplitude values and of sequences of code words characterizing the quantized amplitude values of the signal elements. The reference generator comprises a source of clock pulses, a pulse counter which is provided with a series of counting stages, a resistance-encoding network which is coupled to the counting stages of the pulse counter and to a signal output for the signal elements. The reference generator further comprises and a switching unit comprising a plurality of switching elements, each of which is associated with an individual counting stage of the pulse counter for decoupling the counting stage from the preceding counting stages and for directly coupling the source of clock pulses to the counting stage such that the latter operates as the first counting stage. A control unit is provided for actuating the switching elements according to a program.
Inventors
- 👤 W Widmer
- 👤 Jager F De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:49
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/02; H04B14/04; H04B14/046; H04B14/048
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
170 words
A reference signal generator for use in a pulse code modulation information transmission system with non-uniform coding, for the simultaneous generation of sequences of signal elements having quantized amplitude values and of sequences of code words characterizing the quantized amplitude values of the signal elements, comprising a source of clock pulses; a pulse counter provided with a series of cascaded clock pulse counting stages; a switching unit connected between the source of clock pulses and the pulse counter, the switching unit comprising a plurality of switching element means, each of which is associated with an individual counting stage of the pulse counter for decoupling the associated counting stage from the preceding counting stages and for directly coupling the source of clock pulses to the counting stage whereby the latter operates as the first counting stage; a resistance-encoding network coupled to the counting stages of the pulse counter and to a signal output for the signal elements and a control unit for actuating the switching elements according to a predetermined program.
Claim 2
Dependent Claim
170 words
A reference signal generator for use in a pulse code modulation information transmission system with non-uniform coding, for the simultaneous generation of sequences of signal elements having quantized amplitude values and of sequences of code words characterizing the quantized amplitude values of the signal elements, comprising a source of clock pulses; a pulse counter provided with a series of cascaded clock pulse counting stages; a switching unit connected between the source of clock pulses and the pulse counter, the switching unit comprising a plurality of switching element means, each of which is associated with an individual counting stage of the pulse counter for decoupling the associated counting stage from the preceding counting stages and for directly coupling the source of clock pulses to the counting stage whereby the latter operates as the first counting stage; a resistance-encoding network coupled to the counting stages of the pulse counter and to a signal output for the signal elements and a control unit for actuating the switching elements according to a predetermined program.
Claim 3
Dependent Claim
19 words
A reference signal generator as claimed in claim 1, wherein the control unit is selectively controlled by different programs.
Claim 4
Dependent Claim
42 words
A device as claimed in claim 1, further comprising a second pulse counter means for linearly counting the clock pulses applied to the first pulse counter, outputs being provided on the pulse counter for deriving the said sequences of code words therefrom.
Claim 5
Dependent Claim
36 words
A Device as claimed in claim 1, wherein the program-control unit comprises a decoder connected to the first pulse counter, and a selection unit connected to the decoder and the control inputs of the switching elements.
Claim 6
Dependent Claim
54 words
A device as claimed in claim 4, wherein the decoder comprises a series of gates connected between the outputs of a series of counting stages of the first pulse counter and a control input of the selection unit, a control input of each gate being connected to an individual output of the selection unit.
Claim 7
Dependent Claim
15 words
A device as claimed in claim 5, wherein the selection unit comprises a multistable circuit.
Claim 8
Dependent Claim
36 words
A device as claimed in claim 3, wherein the control unit comprises a decoder connected to the second pulse counter, and a selection unit connected between the decoder and the control inputs of the switching elements.
Claim 9
Dependent Claim
28 words
A device as claimed in claim 7, further comprising a resistance-encoding network coupled to the outputs of the selection unit and the signal output for the signal elements.
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) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |