US3823376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmitter for the transmission of analogue signals by pulse code
Assignee: US Philips Corp
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Filing: 1973-03-19
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Granted: 1974-07-09
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Expires: 1993-03-19
Abstract
Abstract Pulse code modulation transmitter including an instantaneous dynamic control device having a segment-shaped control characteristic, in which the successive amplitude values are converted into codegroups in a first analog-to-digital converter and the different segments of the control characteristic being characterized by codegroups in a second analog-to-digital converter in order to considerably reduce the accuracy requirements in their form, A test circuit is connected to the first analog-to-digital converter formed with an enlarged coding range for the purpose of testing the pulse having the greatest weight and a correction device controlled by the test circuit is coupled for the purpose of correcting codegroups to both the first and the second analog-to-digital converter.
Inventors
- 👤 J Greefkes
- 👤 J Geerlof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:32
CPC Classifications
H; H03; H03M; H03M1/00; H04; H04B; H04B1/00; H04B1/62; H04B1/64; H04B14/00; H04B14/02; H04B14/04; H04B14/046; H04B14/048; H03M1/06; H03M1/0617; H03M1/0675; H03M1/12; H03M1/14; H03M1/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
236 words
A transmitter for the transmission of an analog signal by pulse code modulation, said transmitter comprising a dynamic control for dynamic compression, said dynamic control having segmented-shaped control characteristic curve and being governed by the instantaneous value of the analog signal, a first analog to digital converter for converting amplitude values on an analog signal with a given coding range into code groups having a plurality of pulses of different weights, said first analog to digital converter comprising a first shift register, menas to couple the analog signal to the dynamic control, means to couple the dynamic control to the first analog to digital converter, a second analog to digital converter for generating a code group corresponding to the segment of the segmented-shaped control characteristic curve operative with respect to the input analog signal to the dynamic control, said second analog to digital converter comprising a second shift register, the code groups from the first and the second analog to digital converters being for a common transmission, a test circuit for testing the first shift register for the pulse of the highest weight in the code group therein, a first correction device coupled to the first analog to digital converter and controlled the test circuit for correcting the code groups therefrom, and a second correction device coupled to the second analog to digital converter and controlled by the test circuit for correcting the code groups therefrom.
Claim 2
Dependent Claim
236 words
A transmitter for the transmission of an analog signal by pulse code modulation, said transmitter comprising a dynamic control for dynamic compression, said dynamic control having segmented-shaped control characteristic curve and being governed by the instantaneous value of the analog signal, a first analog to digital converter for converting amplitude values on an analog signal with a given coding range into code groups having a plurality of pulses of different weights, said first analog to digital converter comprising a first shift register, menas to couple the analog signal to the dynamic control, means to couple the dynamic control to the first analog to digital converter, a second analog to digital converter for generating a code group corresponding to the segment of the segmented-shaped control characteristic curve operative with respect to the input analog signal to the dynamic control, said second analog to digital converter comprising a second shift register, the code groups from the first and the second analog to digital converters being for a common transmission, a test circuit for testing the first shift register for the pulse of the highest weight in the code group therein, a first correction device coupled to the first analog to digital converter and controlled the test circuit for correcting the code groups therefrom, and a second correction device coupled to the second analog to digital converter and controlled by the test circuit for correcting the code groups therefrom.
Claim 3
Dependent Claim
24 words
A transmitter as claimed in 1, wherein the test circuit comprises a switching pulse generator which controls the first and the second correction devices.
Claim 4
Dependent Claim
59 words
A transmitter as claimed in claim 1, wherein the first correction device comprises a change-over unit having two positions, the switch of the change-over unit being connected in the first position of the output of elements of the first shift register and in the second position to the elements of the first shift register shifted over by one element.
Claim 5
Dependent Claim
29 words
A transmitter as claimed in claim 1, wherein the second correction device comprises a cascade circuit of a correction voltage source and a switch controlled by the test circuit.
Claim 6
Dependent Claim
28 words
A transmitter as claimed in claim 1, wherein the second correction device comprises a selection gate controlled by the test ciRcuit and pulses from a control pulse generator.
Claim 7
Dependent Claim
90 words
A transmitter as claimed in claim 1, wherein the second analog to digital converter can only produce a code which can only have an error in a given direction, said second analog to digital converter comprising selection gates coupled respectively to the elements of the second shift register, each of said selection gates supplying a cut-off voltage for a code wherein a given logic value appears at each of the elements of the second shift register, said cut-off voltage blocking a cut-off device connected in cascade with said test circuit.
Claim 8
Dependent Claim
61 words
A transmitter as claimed in claim 1, wherein the first shift register includes an additional element for producing a polarity pulse and wherein a change-over control device is connected to the additional element for producing a polarity pulse, said change-over control device including a change-over unit which is responsive to the logic value of other elements of the first shift register.
Claim 9
Dependent Claim
36 words
A transmitter as claimed in claim 1, wherein the output signal of the second analog to digital converter is coupled to a digital to analog converter which supplies a dynamic control voltage for the dynamic control.
Claim 10
Dependent Claim
63 words
A transmitter as claimed in claim 8, wherein the first analog to digital converter comprises a pulse duration modulator, a saw-tooth generator for generating a sawtooth voltage for controlling the pulse duration modulator, an amplitude modulator coupled to the saw-tooth generator, means to couple the dynamic control voltage to the amplitude modulator, and a binary counting device coupled to the pulse duration modulator.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |