GB1479313A – Digital data rate converters
– Google Patents
GB1479313A – Digital data rate converters
– Google Patents
Digital data rate converters
Info
Publication number
GB1479313A
GB1479313A
GB1452974A
GB1452974A
GB1479313A
GB 1479313 A
GB1479313 A
GB 1479313A
GB 1452974 A
GB1452974 A
GB 1452974A
GB 1452974 A
GB1452974 A
GB 1452974A
GB 1479313 A
GB1479313 A
GB 1479313A
Authority
GB
United Kingdom
Prior art keywords
word
words
counter
padding
store
Prior art date
1975-03-26
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
GB1452974A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co Ltd
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.)
1975-03-26
Filing date
1975-03-26
Publication date
1977-07-13
1975-03-26
Application filed by Marconi Co Ltd
filed
Critical
Marconi Co Ltd
1975-03-26
Priority to GB1452974A
priority
Critical
patent/GB1479313A/en
1977-07-13
Publication of GB1479313A
publication
Critical
patent/GB1479313A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
H04L25/00—Baseband systems
H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
H04L25/05—Electric or magnetic storage of signals before transmitting or retransmitting for changing the transmission rate
Abstract
1479313 Data transmission; speed changing MARCONI CO Ltd 26 March 1975 [2 April 1974] 14529/74 Heading H4P A bit rate converter for transmitting data at a rate higher than incoming comprises means dividing lower bit rate incoming data into determined word length which are stored then read-out at a higher rate and means for detecting the difference in rates and inserting padding words of fixed length into the output stream such that the padding words fill the gaps. The higher rate may be independent of the lower and data word length may be the same as the padding word, which can contain information regarding the position of the next following padding word. 60 kHz bipolar data applied at terminal 2 is converted to binary form by converter 1 which also synchronizes oscillator 3; this drives serial/parallel converter 4 dividing the data into 8 bit words, also word counter 6 through a ¸8 dividing circuit 5. Counter 6 outputs specify the next location of a store 7 to be filled, content of which is monitored by 8, also recording clock rates. Parallel/serial converter 10 is driven at a transmitting frequency of 64 kHz causing data words to be read-out of store 7 at this higher rate which is also detected by 8 from which difference in rates is determined. When a counter 15, clocked at word rate 8 kHz is full, it is reset and an enabling signal passed to padding word generator 16, selector 9 and counter 14; the word developed by 16 depends on an input from 8 which specifies for example whether the next padding word will be found after 14, 15 or 16 information words, counter 15 being given a start position depending on the number of words. At insertion periods counter 14 is inhibited for one word. If input and output clocks are in relative synchronism, content of store 7 will remain substantially constant hence generator 16 may produce a coded signal of 0001 to counter 15 hence provide a reset signal after 15 words have been transmitted. If the transmitting clock is running relatively slowly, store 7 will tend to fill hence the signal passed to counter 15 will be 0000 hence will reset every 16 words. Conversely if store 7 is tending to empty then 0010 is passed to 15 hence insertion will be after only 14 words. The receiver, which is approximately a «mirror image» of a transmitter has a counter (26), Fig. 2 (not shown), receiving the coded signal specifying the position of the next padding word and provides on reset this information to a device (24) which arrangement avoids error in case an information word should fortuitously contain the same sequence as padding words. The receiver also includes a frequency control (31) thus ensuring that store (23) neither completely fills nor empties.
GB1452974A
1975-03-26
1975-03-26
Digital data rate converters
Expired
GB1479313A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB1452974A
GB1479313A
(en)
1975-03-26
1975-03-26
Digital data rate converters
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB1452974A
GB1479313A
(en)
1975-03-26
1975-03-26
Digital data rate converters
Publications (1)
Publication Number
Publication Date
GB1479313A
true
GB1479313A
(en)
1977-07-13
Family
ID=10042849
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1452974A
Expired
GB1479313A
(en)
1975-03-26
1975-03-26
Digital data rate converters
Country Status (1)
Country
Link
GB
(1)
GB1479313A
(en)
Cited By (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2118400A
(en)
*
1982-03-30
1983-10-26
Western Electric Co
Switching digital data signals
US4525835A
(en)
*
1981-10-13
1985-06-25
International Standard Electric Corporation
Duplex radio system utilizing time compression expansion
FR2627040A1
(en)
*
1988-02-09
1989-08-11
Labo Cent Telecommunicat
METHOD AND DEVICES FOR SYNCHRONIZATION BETWEEN TERMINALS COMMUNICATING THROUGH A CHAIN THAT DOES NOT ENSURE TIME TRANSPARENCY
WO1989011188A1
(en)
*
1988-05-11
1989-11-16
SIEMENS AKTIENGESELLSCHAFT öSTERREICH
Coupling field for digital audio signals
EP0572168A2
(en)
*
1992-05-29
1993-12-01
AT&T Corp.
Method for matching symbol rates in a communications network
EP0845886A2
(en)
*
1996-11-27
1998-06-03
Sony United Kingdom Limited
Digital signal processing apparatus, such as a digital audio mixer
1975
1975-03-26
GB
GB1452974A
patent/GB1479313A/en
not_active
Expired
Cited By (12)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4525835A
(en)
*
1981-10-13
1985-06-25
International Standard Electric Corporation
Duplex radio system utilizing time compression expansion
GB2118400A
(en)
*
1982-03-30
1983-10-26
Western Electric Co
Switching digital data signals
FR2627040A1
(en)
*
1988-02-09
1989-08-11
Labo Cent Telecommunicat
METHOD AND DEVICES FOR SYNCHRONIZATION BETWEEN TERMINALS COMMUNICATING THROUGH A CHAIN THAT DOES NOT ENSURE TIME TRANSPARENCY
EP0328448A1
(en)
*
1988-02-09
1989-08-16
Matra Communication
Process and device for the synchronisation of terminals communicating via a chain without temporary transparency
WO1989011188A1
(en)
*
1988-05-11
1989-11-16
SIEMENS AKTIENGESELLSCHAFT öSTERREICH
Coupling field for digital audio signals
EP0342530A1
(en)
*
1988-05-11
1989-11-23
Siemens Aktiengesellschaft Österreich
Switching network for digital audio signals
US5099234A
(en)
*
1988-05-11
1992-03-24
Siemens Aktiengesellschaft Osterreich
Switching matrix network for digital audio signals
EP0572168A2
(en)
*
1992-05-29
1993-12-01
AT&T Corp.
Method for matching symbol rates in a communications network
EP0572168A3
(en)
*
1992-05-29
1994-08-03
At & T Corp
US5521949A
(en)
*
1992-05-29
1996-05-28
At&T Corp.
Synchronization scheme for digital communications systems transporting data at a customer-controlled rate
EP0845886A2
(en)
*
1996-11-27
1998-06-03
Sony United Kingdom Limited
Digital signal processing apparatus, such as a digital audio mixer
EP0845886A3
(en)
*
1996-11-27
2004-02-04
Sony United Kingdom Limited
Digital signal processing apparatus, such as a digital audio mixer
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Legal Events
Date
Code
Title
Description
1977-11-23
PS
Patent sealed
1984-11-28
PCNP
Patent ceased through non-payment of renewal fee
