GB1361074A - Multiplexing apparatus - Google Patents
Multiplexing apparatusInfo
- Publication number
- GB1361074A GB1361074A GB4357071A GB4357071A GB1361074A GB 1361074 A GB1361074 A GB 1361074A GB 4357071 A GB4357071 A GB 4357071A GB 4357071 A GB4357071 A GB 4357071A GB 1361074 A GB1361074 A GB 1361074A
- Authority
- GB
- United Kingdom
- Prior art keywords
- active
- interval
- flip
- speech
- converters
- Prior art date
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1682—Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers
- H04J3/1688—Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers the demands of the users being taken into account after redundancy removal, e.g. by predictive coding, by variable sampling
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Time-Division Multiplex Systems (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
Abstract
1361074 Speech transmission systems ELECTRONIC COMMUNICATIONS Inc 17 Sept 1971 [30 Oct 1970] 43570/71 Heading G4H In a speech multiplexing system, preferably utilizing delta modulation, the sampling rate of the individual speech inputs is rendered dependent upon the number active at the start of a sampling interval. Speech inputs are each fed to a corresponding #-# A/D converter which is associated with a threshold logic device to provide an indication as to the activity of the related input, this indication being taken to set a flip-flop related to a corresponding stage of a ring counter comprising a series of flip-flops to remove the stage from the series if the source is inactive. The beginning of a sampling interval is defined by a clock pulse adapted to cause read in from the threshold devices and to set a "low" state into the first flip-flop of the series whose source is active. The counter is then clocked during the interval so that the "low" state is moved through all the stages with active inputs in a cyclic fashion to clock the relevant A/D converters in turn. Read-in from the threshold devices is effected, e.g. every 1 ms. The multiplexed data from the converters plus synchronizing and format data is transmitted using conventional apparatus to a receiver containing a clock synchronizer adapted to respond to call words in the transmission, and a distributer in addition to a similar ring counter providing outputs in a corresponding way as the first counter, to a plurality of D/A converters. Details of the multiplexing process are not described. Thus the sampling rate of any one source, whilst it is active, is altered at each 1 ms. interval. It is stated that this is sufficiently rapid to achieve an averaging effect in the human ear.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US8567170A | 1970-10-30 | 1970-10-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1361074A true GB1361074A (en) | 1974-07-24 |
Family
ID=22193196
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4357071A Expired GB1361074A (en) | 1970-10-30 | 1971-09-17 | Multiplexing apparatus |
Country Status (8)
Country | Link |
---|---|
BE (1) | BE774790A (en) |
CA (1) | CA945696A (en) |
DE (1) | DE2152280C3 (en) |
FR (1) | FR2110085A5 (en) |
GB (1) | GB1361074A (en) |
IT (1) | IT938626B (en) |
NL (1) | NL179530C (en) |
NO (1) | NO136270C (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3432429C1 (en) * | 1984-09-04 | 1986-02-27 | Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt | Method for signal transmission while a call is in progress in telephone switching systems interconnected as main and secondary systems |
-
1971
- 1971-09-16 CA CA123,051A patent/CA945696A/en not_active Expired
- 1971-09-17 GB GB4357071A patent/GB1361074A/en not_active Expired
- 1971-10-20 DE DE19712152280 patent/DE2152280C3/en not_active Expired
- 1971-10-25 NO NO394471A patent/NO136270C/en unknown
- 1971-10-28 FR FR7138708A patent/FR2110085A5/fr not_active Expired
- 1971-10-29 NL NL7114960A patent/NL179530C/en not_active IP Right Cessation
- 1971-10-29 BE BE774790A patent/BE774790A/en not_active IP Right Cessation
- 1971-10-29 IT IT974371A patent/IT938626B/en active
Also Published As
Publication number | Publication date |
---|---|
DE2152280B2 (en) | 1976-07-15 |
IT938626B (en) | 1973-02-10 |
NL179530C (en) | 1986-09-16 |
CA945696A (en) | 1974-04-16 |
DE2152280C3 (en) | 1980-08-07 |
FR2110085A5 (en) | 1972-05-26 |
DE2152280A1 (en) | 1972-05-04 |
BE774790A (en) | 1972-02-14 |
NO136270B (en) | 1977-05-02 |
NL7114960A (en) | 1972-05-03 |
NL179530B (en) | 1986-04-16 |
NO136270C (en) | 1977-08-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PE20 | Patent expired after termination of 20 years |