US3594509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delta modulator apparatus
Assignee: NEC Corp
•
Filing: 1969-08-05
•
Granted: 1971-07-20
•
Expires: 1989-08-05
Abstract
Abstract Delta modulator apparatus is provided in accordance with the teachings of the present invention. In one exemplary embodiment of the present invention high-speed delta modulator apparatus is provided wherein a plurality of relatively low speed delta modulator means are arranged so that one of such plurality of low speed delta modulator means adapted to receive an input signal to be modulated while each succeeding one of said plurality of low speed delta modulator means is connected to a preceding one of such plurality of low speed delta modulator means in a manner to receive an error signal therefrom as an input thereto. The plurality of relatively low speed delta modulator means each includes commonly timed coder means whose outputs may be combined in a multiplex manner whereby the resulting modulator apparatus exhibits an equivalent sampling rate equal to the sampling rate of each of said plurality of relatively low speed delta modulator means multiplied by the number of relatively low speed delta modulator means present in said plurality.
Inventors
- 👤 Tadao Shimamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:44
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/02; H04B14/06; H04B14/062
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
166 words
Delta modulator apparatus comprising: a plurality of delta modulator stages adapted to receive an input signal and produce in response thereto a coded pulse train output representative of the input signal received, each of said plurality of delta modulator stages including means for deriving an error signal equal to the difference between said coded pulse train output representative of the input signal received and the actual input signal received and means for coding said error signal to thereby produce said coded pulse train; means for applying a signal to be modulated to one of said plurality of delta modulator stages as an input signal thereto and means for applying to each of said plurality of delta modulator stages other than said one stage an error signal derived in an associated preceding one of said plurality of delta modulator stages as an input signal thereto; and means for accepting said coded pulse train output of each of said delta modulator stages and preparing the same for transmission.
Claim 2
Dependent Claim
166 words
Delta modulator apparatus comprising: a plurality of delta modulator stages adapted to receive an input signal and produce in response thereto a coded pulse train output representative of the input signal received, each of said plurality of delta modulator stages including means for deriving an error signal equal to the difference between said coded pulse train output representative of the input signal received and the actual input signal received and means for coding said error signal to thereby produce said coded pulse train; means for applying a signal to be modulated to one of said plurality of delta modulator stages as an input signal thereto and means for applying to each of said plurality of delta modulator stages other than said one stage an error signal derived in an associated preceding one of said plurality of delta modulator stages as an input signal thereto; and means for accepting said coded pulse train output of each of said delta modulator stages and preparing the same for transmission.
Claim 3
Dependent Claim
45 words
The delta modulator apparatus according to claim 1 wherein said means for accepting said coded pulse train output of each of said delta modulator stages includes multiplexing means for converting each of said coded pulse train outputs into a resultant high speed multiplexed pulse train.
Claim 4
Dependent Claim
76 words
The delta modulator apparatus according to claim 2 wherein said means for applying to each of said plurality of delta modulator stages other than said one stage an error signal derived in an associated preceding one of said plurality of delta modulator stages as an input signal thereto comprises means for connecting each of said plurality of delta modulator stages other than said one stage to a delta modulator stage immediately preceding such delta modulator stage.
Claim 5
Dependent Claim
50 words
The delta modulator apparatus according to claim 3 wherein each of said plurality of delta modulator stages other than said one stage is connected to said immediately preceding delta modulator stage through low-pass filter means, said low-pass filter means acting to remove sampling frequency components present in said error signal.
Claim 6
Dependent Claim
25 words
The delta modulator apparatus according to claim 3 wherein each of said plurality of delta modulator stages comprises subtractor means, coder means and integrator means.
Claim 7
Dependent Claim
70 words
The delta modulator apparatus according to claim 5 wherein an output of said coder means is connected to said integrator means at an input thereof, an output of said integrator means is connected to said subtractor means at one input thereto, an output of said subtractor means is connected to an input of said coder means and another input of said subtractor means is adapted to receive an input signal.
Claim 8
Dependent Claim
43 words
The delta modulator apparatus according to claim 6 wherein said coder means are each commonly connected to means for providing sampling signals thereto and said outputs of each of said coder means are additionally connected to said multiplexing means at discrete inputs thereto.
Claim 9
Dependent Claim
46 words
The delta modulator apparatus according to claim 7 wherein said multiplexing means acts to convert said coded pulse train outputs applied to each of the discrete inputs thereto into said resultant high-speed multiplexed pulse train wherein time slots are assigned on a bit by bit basis.
Claim 10
Dependent Claim
43 words
The delta modulator apparatus according to claim 8 wherein said delta modulator apparatus exhibits an equivalent sampling rate equal to the sampling rate of each of said plurality of delta modulator stages multiplied by the number of delta modulator stages in said plurality.
Claim 11
Dependent Claim
19 words
The delta modulator apparatus according to claim 9 wherein each of said integrator means exhibits closely matched electrical characteristics.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |