GB1292642A - Creación de Inventos y Patentes con Inteligencia Artificial

GB1292642A – Improvements in or relating to pulse code modulation systems
– Google Patents

GB1292642A – Improvements in or relating to pulse code modulation systems
– Google Patents
Improvements in or relating to pulse code modulation systems

Info

Publication number
GB1292642A

GB1292642A
GB22042/69A
GB2204269A
GB1292642A
GB 1292642 A
GB1292642 A
GB 1292642A
GB 22042/69 A
GB22042/69 A
GB 22042/69A
GB 2204269 A
GB2204269 A
GB 2204269A
GB 1292642 A
GB1292642 A
GB 1292642A
Authority
GB
United Kingdom
Prior art keywords
polarity
amplitude
bits
amplifier
bit
Prior art date
1969-04-30
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Expired

Application number
GB22042/69A
Inventor
Roger Martin Wilkinson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

UK Secretary of State for Defence

Original Assignee
UK Secretary of State for Defence
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1969-04-30
Filing date
1969-04-30
Publication date
1972-10-11

1969-04-30
Application filed by UK Secretary of State for Defence
filed
Critical
UK Secretary of State for Defence

1969-04-30
Priority to GB22042/69A
priority
Critical
patent/GB1292642A/en

1970-04-27
Priority to US32322A
priority
patent/US3657653A/en

1970-04-30
Priority to DE19702021381
priority
patent/DE2021381A1/en

1970-04-30
Priority to FR7016099A
priority
patent/FR2040504B1/fr

1970-05-01
Priority to NL7006485A
priority
patent/NL7006485A/xx

1972-10-11
Publication of GB1292642A
publication
Critical
patent/GB1292642A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

Classifications

H—ELECTRICITY

H03—ELECTRONIC CIRCUITRY

H03M—CODING; DECODING; CODE CONVERSION IN GENERAL

H03M3/00—Conversion of analogue values to or from differential modulation

H03M3/04—Differential modulation with several bits, e.g. differential pulse code modulation [DPCM]

Abstract

1292642 Pulse code modulation systems DEFENCE SECRETARY OF STATE FOR 29 April 1970 [30 April 1969] 22042/69 Heading G4H A P.C.M. system for transmitting speech signals comprises apparatus for generating digital word signals, each representing a sampledinstantaneous value of the speech signal, each word signal comprising one polarity-bit signal representing the sign of the difference between a sampled value and earth and at least one amplitude-bit signal representing the magnitude of the difference between the sampled value and a variable reference level signal V. The input speech signal is fed via a band pass filter 2 to three comparator amplifiers 3-5, the reference input of the polarity-bit amplifier 4 being earthed whilst the reference inputs of the amplitude-bit amplifiers 3 and 5 receive signals + V and – V respectively. The outputs of these amplifiers have «0» or «1» states depending on whether their sampled inputs are less than or greater than their reference inputs. The amplifier outputs are fed to sample and hold circuits 9, 10, which may comprise J-K flip-flops, and which are strobed by signals from a bi-stable circuit 11. A logic circuit comprising gates 12-14 ensures that a sequence of alternate polarity and amplitude-bits are fed to the input of a transmitter 15. The reference voltage V is derived from the output of the circuit 9 which is fed via an integrating circuit 16, 17 to the amplifier 3. The transmitted digital signals are supplied to a receiver 30, the output of which is fed to sample and hold circuits 33, 36, each having complementary outputs C, D and A, B. A further sample and hold circuit 32, strobed by signals from a bi-stable 35, delays each polarity-bit so that simultaneous amplitude and polarity-bits appear at the outputs of the circuits 33 and 36 respectively. To prevent the amplitude – bits being routed through the polarity-bit channel and vice versa, a threshold detecting circuit 41-44 is provided. Since the polarity-bits comprise equal numbers of zeros and ones, the polarity-bit channel will have an output equal to the mean of the two voltages representing the zero and one bits. The amplifier 43 is therefore arranged to provide a zero voltage to the input of a pulse generator 46 when the input to the amplifier equals this mean voltage, thus preventing the operation of the pulse generator. If, however, the amplitude-bits should appear on the polarity channel, the input voltage to the amplifier 43 is reduced and the pulse generator provides a pulse to change the state of the bi-stable 35, thereby bringing it into synchronism with the received polarity-bits. The output C of the amplitudebit channel is connected to an integrating circuit 48, 49 of similar time constant to that of the integrating circuit 16, 17 so that the voltage V1 developed across the capacitor 49 matches the reference voltage V. A decoding circuit, including «AND» gates 37-40 which control the switching of field effect transistors 65-68, selectively feeds the voltages V1 or V1/ 2 to an operational amplifier 54 connected to a low-pass filter 63 and an audio output terminal 64. A transmitter and receiver in which two signals are used to represent the amplitude of the sampled speech signal are also described.

GB22042/69A
1969-04-30
1969-04-30
Improvements in or relating to pulse code modulation systems

Expired

GB1292642A
(en)

Priority Applications (5)

Application Number
Priority Date
Filing Date
Title

GB22042/69A

GB1292642A
(en)

1969-04-30
1969-04-30
Improvements in or relating to pulse code modulation systems

US32322A

US3657653A
(en)

1969-04-30
1970-04-27
Pulse code modulation system

DE19702021381

DE2021381A1
(en)

1969-04-30
1970-04-30

Communication device

FR7016099A

FR2040504B1
(en)

1969-04-30
1970-04-30

NL7006485A

NL7006485A
(en)

1969-04-30
1970-05-01

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

GB22042/69A

GB1292642A
(en)

1969-04-30
1969-04-30
Improvements in or relating to pulse code modulation systems

Publications (1)

Publication Number
Publication Date

GB1292642A
true

GB1292642A
(en)

1972-10-11

Family
ID=10172940
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB22042/69A
Expired

GB1292642A
(en)

1969-04-30
1969-04-30
Improvements in or relating to pulse code modulation systems

Country Status (5)

Country
Link

US
(1)

US3657653A
(en)

DE
(1)

DE2021381A1
(en)

FR
(1)

FR2040504B1
(en)

GB
(1)

GB1292642A
(en)

NL
(1)

NL7006485A
(en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US3831096A
(en)

1972-04-24
1974-08-20
Itt
Telemetry receiver phase detector output signal processing circuit

US3810152A
(en)

1972-10-13
1974-05-07
Becton Dickinson Co
Method and apparatus for conversion of a variable resistance to a time modulated signal and for analogue restoration

US4039948A
(en)

1974-06-19
1977-08-02
Boxall Frank S
Multi-channel differential pulse code modulation system

US3982240A
(en)

1974-09-19
1976-09-21
United Technologies Corporation
Bipolar A/D converter using two comparators

US4001504A
(en)

1975-06-09
1977-01-04
International Business Machines Corporation
Automatic terminal data rate selection

US4419657A
(en)

1978-02-24
1983-12-06
Federal Screw Works
Speech digitization system

FR2492612A1
(en)

1980-10-16
1982-04-23
Mecilec Sa

INCREMENTAL DIGITAL ANALOGUE CONVERSION METHOD AND DEVICE

US5056118A
(en)

1989-05-16
1991-10-08
Rockwell International Corporation
Method and apparatus for clock and data recovery with high jitter tolerance

US7012600B2
(en)

1999-04-30
2006-03-14
E Ink Corporation
Methods for driving bistable electro-optic displays, and apparatus for use therein

US6509746B1
(en)

2001-06-04
2003-01-21
Rosemount Inc.
Excitation circuit for compensated capacitor industrial process control transmitters

US8269528B2
(en)

2010-11-18
2012-09-18
Texas Instruments Incorporated
Timing skew error correction apparatus and methods

Family Cites Families (3)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US2916553A
(en)

1957-05-31
1959-12-08
Bell Telephone Labor Inc
High speed delta modulation encoder

US3065422A
(en)

1959-11-18
1962-11-20
Bell Telephone Labor Inc
Nonlinear pcm encoders

US3462686A
(en)

1966-02-04
1969-08-19
Westinghouse Electric Corp
Signal processing and reconstruction apparatus utilizing constant area quantization

1969

1969-04-30
GB
GB22042/69A
patent/GB1292642A/en
not_active
Expired

1970

1970-04-27
US
US32322A
patent/US3657653A/en
not_active
Expired – Lifetime

1970-04-30
FR
FR7016099A
patent/FR2040504B1/fr
not_active
Expired

1970-04-30
DE
DE19702021381
patent/DE2021381A1/en
active
Pending

1970-05-01
NL
NL7006485A
patent/NL7006485A/xx
unknown

Also Published As

Publication number
Publication date

FR2040504A1
(en)

1971-01-22

DE2021381A1
(en)

1970-12-23

FR2040504B1
(en)

1976-02-06

NL7006485A
(en)

1970-11-03

US3657653A
(en)

1972-04-18

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