GB1528954A – Digital attenuator
– Google Patents
GB1528954A – Digital attenuator
– Google Patents
Digital attenuator
Info
Publication number
GB1528954A
GB1528954A
GB23457/75A
GB2345775A
GB1528954A
GB 1528954 A
GB1528954 A
GB 1528954A
GB 23457/75 A
GB23457/75 A
GB 23457/75A
GB 2345775 A
GB2345775 A
GB 2345775A
GB 1528954 A
GB1528954 A
GB 1528954A
Authority
GB
United Kingdom
Prior art keywords
signal
shift register
input
digital attenuator
companded
Prior art date
1975-05-29
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
GB23457/75A
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.)
Post Office
Original Assignee
Post Office
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.)
1975-05-29
Filing date
1975-05-29
Publication date
1978-10-18
1975-05-29
Application filed by Post Office
filed
Critical
Post Office
1975-05-29
Priority to GB23457/75A
priority
Critical
patent/GB1528954A/en
1976-05-26
Priority to SE7606014A
priority
patent/SE7606014L/en
1976-05-26
Priority to NL7605703A
priority
patent/NL7605703A/en
1976-05-28
Priority to FR7616180A
priority
patent/FR2312883A1/en
1976-05-29
Priority to DE19762624257
priority
patent/DE2624257A1/en
1978-10-18
Publication of GB1528954A
publication
Critical
patent/GB1528954A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G06—COMPUTING; CALCULATING OR COUNTING
G06F—ELECTRIC DIGITAL DATA PROCESSING
G06F1/00—Details not covered by groups G06F3/00 – G06F13/00 and G06F21/00
G06F1/02—Digital function generators
G—PHYSICS
G06—COMPUTING; CALCULATING OR COUNTING
G06F—ELECTRIC DIGITAL DATA PROCESSING
G06F5/00—Methods or arrangements for data conversion without changing the order or content of the data handled
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
H03H17/00—Networks using digital techniques
H03H17/0054—Attenuators
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
H03M7/50—Conversion to or from non-linear codes, e.g. companding
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04B—TRANSMISSION
H04B14/00—Transmission systems not characterised by the medium used for transmission
H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
H04B14/046—Systems or methods for reducing noise or bandwidth
H04B14/048—Non linear compression or expansion
Abstract
1528954 Digital attenuator POST OFFICE 27 May 1976 [29 May 1975] 23457/75 Heading H4R In a digital attenuator for providing a predetermined attenuation to a companded p.c.m. signal the input signal is fed into a shift register B1, B2, B3, B4, through which the bits are serially shifted, with the original bit sequence sensed and the logical state of at least one bit modified to provide a signal at the shift register output which represents a predetermined fraction of the value represented by the shift register output. As described the input signal is a p.c.m. signal companded according to the A-law and according to the particular segment in which the signal lies at any instant, as determined by the logical state of the second, third and fourth digits of the coded signal, the first digit being a sign digit, the interconnections of the shift register are modified, and/or an extra stage B5 inserted at the register input, to provide an input/output correspondence as indicated in table 1 (not shown).
GB23457/75A
1975-05-29
1975-05-29
Digital attenuator
Expired
GB1528954A
(en)
Priority Applications (5)
Application Number
Priority Date
Filing Date
Title
GB23457/75A
GB1528954A
(en)
1975-05-29
1975-05-29
Digital attenuator
SE7606014A
SE7606014L
(en)
1975-05-29
1976-05-26
DIGITAL DAMPING CIRCUIT
NL7605703A
NL7605703A
(en)
1975-05-29
1976-05-26
DIGITAL ATTENUATOR.
FR7616180A
FR2312883A1
(en)
1975-05-29
1976-05-28
DIGITAL ATTENUATOR, ESPECIALLY FOR COMPRESSED SIGNALS IN MODULATION BY CODE PULSES
DE19762624257
DE2624257A1
(en)
1975-05-29
1976-05-29
DIGITAL DAMPING ARRANGEMENT
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB23457/75A
GB1528954A
(en)
1975-05-29
1975-05-29
Digital attenuator
Publications (1)
Publication Number
Publication Date
GB1528954A
true
GB1528954A
(en)
1978-10-18
Family
ID=10195942
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB23457/75A
Expired
GB1528954A
(en)
1975-05-29
1975-05-29
Digital attenuator
Country Status (5)
Country
Link
DE
(1)
DE2624257A1
(en)
FR
(1)
FR2312883A1
(en)
GB
(1)
GB1528954A
(en)
NL
(1)
NL7605703A
(en)
SE
(1)
SE7606014L
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO2007025561A1
(en)
*
2005-09-01
2007-03-08
Telefonaktiebolaget Lm Ericsson (Publ)
Processing encoded real-time data
Families Citing this family (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4454498A
(en)
*
1979-05-21
1984-06-12
Siemens Aktiengesellschaft
Adjustable attenuation member for a digital telecommunications system
DE3232548A1
(en)
*
1982-09-01
1984-03-01
Siemens AG, 1000 Berlin und 8000 München
METHOD AND CIRCUIT FOR TRANSCODING CODE WORDS
Family Cites Families (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3688097A
(en)
*
1970-05-20
1972-08-29
Bell Telephone Labor Inc
Digital attenuator for non-linear pulse code modulation signals
US3781821A
(en)
*
1972-06-02
1973-12-25
Ibm
Selective shift register
1975
1975-05-29
GB
GB23457/75A
patent/GB1528954A/en
not_active
Expired
1976
1976-05-26
NL
NL7605703A
patent/NL7605703A/en
not_active
Application Discontinuation
1976-05-26
SE
SE7606014A
patent/SE7606014L/en
unknown
1976-05-28
FR
FR7616180A
patent/FR2312883A1/en
active
Pending
1976-05-29
DE
DE19762624257
patent/DE2624257A1/en
not_active
Withdrawn
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO2007025561A1
(en)
*
2005-09-01
2007-03-08
Telefonaktiebolaget Lm Ericsson (Publ)
Processing encoded real-time data
US7804836B2
(en)
2005-09-01
2010-09-28
Telefonaktiebolaget L M Ericsson (Publ)
Processing encoded real-time data
CN101268506B
(en)
*
2005-09-01
2011-08-03
艾利森电话股份有限公司
Processing code real-time data
Also Published As
Publication number
Publication date
SE7606014L
(en)
1976-11-30
DE2624257A1
(en)
1976-12-09
NL7605703A
(en)
1976-12-01
FR2312883A1
(en)
1976-12-24
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Legal Events
Date
Code
Title
Description
1979-02-07
PS
Patent sealed
1979-04-25
746
Register noted ‘licences of right’ (sect. 46/1977)
1981-02-04
PCNP
Patent ceased through non-payment of renewal fee
