EP0076505A1
Expired / Lapsed
EP
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Digital transmitting system
Assignee: NEC Corp
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Filing: 1982-10-04
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Granted: —
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Expires: 2002-10-04
Abstract
Abstract In a digital transmitting system wherein signal information is transmitted from a transmission buffer memory device (10) to a receiving buffer memory device (11) through a transmission line (4) extending therebetween, there are provided a counter (31) for producing count information proportional to a sum of information transmission delay times in the transmission of receiving buffer memory devices (10,11), and a read control circuit (15) which controls the read-out time of the information from the receiving buffer memory device (111 such that a count of the counter coincides with a predetermined reference value, thereby rendering a sum of the information transmission delay times coincident with a predetermined time. According to this system even when the information transmission speed of the transmission line (4) varies with time, it is possible to correctly transmit and reproduce the information with a predetermined definite information transmission delay time.
Inventors
- 👤 Yukihiko Iijima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 08:38
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/22; H04L5/24; H04L25/00; H04L25/02; H04L25/05
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
417 words
A digital transmitting system comprising: a transmission buffer memory device (10) provided on a transmission side (23) for effecting speed conversion between speeds of generation of communication information to be transmitted and of transmission' thereof; a receiving buffer memory device (11) provided on a receiving side (24) for effecting speed conversion between the transmission speed and the reproducing speed of the communication information; said transmission side (23) being provided with: first counting means (27) counting the number of pulse signals having a predetermined period; first multiplexing means (9) which multiplexes count-information output from said first counting means (27) and communication information at a predetermined interval and sends multiplexed information to the transmission buffer memory device (10); first information separating means (25) receiving the multiplexed information to separate the communication information from the count information; and transmitting means (28) which, when said first information separating means (25) outputs the count information, subtracts the count information output from said first information separating means (25) from the count information output from said first counting means (27) and multiplexes resulting difference count information and the communication information sent from said first separating means (25) for transmission of the thus multiplexed information; and said receiving side (24) being provided with: receiving means (29) receiving the multiplexed information to separate the communication information from the count information for transmission the thus separated information; second counting means (31) counting the number of the pulse signals having the predetermined period; second multiplexing means (30) which, when the receiving means (29) transmits the count information, multiplexes difference count information formed by subtracting the count information output from said second counting means (31) from the thus transmitted count information and the communication information output from said transmitting means and which sends the thus multiplexed information to said receiving buffer memory device (11 second information separating means (12) receiving the multiplexed information from said receiving buffer memory device (11) to separate the communication information from the count information transmission; means (33) for comparing a sum of the count information output from said second counting means (31) and the information output from said second separating means (12) with a predetermined reference value when said second separating means (12) transmits the count information;and control means (15) for setting a time for reproducing the communication information being transmitted from said receiving buffer memory device (11) such that the delay time in transmission of the communication information between the transmission and receiving buffer memory devices (10,11) will be in a predetermined range.
Claim 2
Dependent Claim
417 words
A digital transmitting system comprising: a transmission buffer memory device (10) provided on a transmission side (23) for effecting speed conversion between speeds of generation of communication information to be transmitted and of transmission' thereof; a receiving buffer memory device (11) provided on a receiving side (24) for effecting speed conversion between the transmission speed and the reproducing speed of the communication information; said transmission side (23) being provided with: first counting means (27) counting the number of pulse signals having a predetermined period; first multiplexing means (9) which multiplexes count-information output from said first counting means (27) and communication information at a predetermined interval and sends multiplexed information to the transmission buffer memory device (10); first information separating means (25) receiving the multiplexed information to separate the communication information from the count information; and transmitting means (28) which, when said first information separating means (25) outputs the count information, subtracts the count information output from said first information separating means (25) from the count information output from said first counting means (27) and multiplexes resulting difference count information and the communication information sent from said first separating means (25) for transmission of the thus multiplexed information; and said receiving side (24) being provided with: receiving means (29) receiving the multiplexed information to separate the communication information from the count information for transmission the thus separated information; second counting means (31) counting the number of the pulse signals having the predetermined period; second multiplexing means (30) which, when the receiving means (29) transmits the count information, multiplexes difference count information formed by subtracting the count information output from said second counting means (31) from the thus transmitted count information and the communication information output from said transmitting means and which sends the thus multiplexed information to said receiving buffer memory device (11 second information separating means (12) receiving the multiplexed information from said receiving buffer memory device (11) to separate the communication information from the count information transmission; means (33) for comparing a sum of the count information output from said second counting means (31) and the information output from said second separating means (12) with a predetermined reference value when said second separating means (12) transmits the count information;and control means (15) for setting a time for reproducing the communication information being transmitted from said receiving buffer memory device (11) such that the delay time in transmission of the communication information between the transmission and receiving buffer memory devices (10,11) will be in a predetermined range.
Claim 3
Dependent Claim
54 words
The digital transmitting system according to claim 1 which further comprises an interframe encoder (8) which encodes, in an interframe fashion, said information to be transmitted, and means for applying an output signal of said interframe encoder (8) to said first multiplexer (9) together with an output signal of said first counting means (27).
Claim 4
Dependent Claim
76 words
The digital transmitting system according to claim 1 or 2, wherein said first multiplexing means (9) multiplexes, on the time division basis and at a predetermined period, the coded information output from said interframe encoder (8) and the count information output from said first counter means (27) and added with identifying code information, multiplexed information output from said first multiplexing means (9) being applied to said transmission buffer memory device (10) together with a write pulse.
Claim 5
Dependent Claim
53 words
The digital transmitting system according to any of claims 1 to 3, wherein said transmitting buffer memory device (10) stores the multiplexed information output from said first- multiplexing means (9) in an address designated by a predetermined write address signal and then advances said address by one to prepare for a next writing.
Claim 6
Dependent Claim
49 words
The digital transmitting system according to any of claims 1 to 4, wherein said transmission buffer memory device (10) is supplied with a read pulse having speed corresponding to an information transmission speed in a transmission line (4) extending between said transmitting side (23) and said receiving side (24).
Claim 7
Dependent Claim
48 words
The digital transmitting system according to any of claims 1 to 5 which further comprises means for supplying information indicative of a quantity of information accumulated in said transmission buffer memory device (10) to said interframe encoder (8) for controlling a speed of generation of said coded information.
Claim 8
Dependent Claim
37 words
The digital transmitting system according to any of claims 1 to 6 wherein said receiving means (24) comprises an information separator (29) which receives the multiplexed information to separate the information being transmitted from the count information.
Claim 9
Dependent Claim
52 words
The digital transmitting system according to any of claims 1 to 7 wherein said receiving,means (24) further includes a subtractor (32) which subtracts a count value of said second counting means (31) from an output signal output from said information separator (29) and supplies different information to said second multiplexing means (30).
References Cited (Backward Citations)
US4027100A
Cited
US4215369A
Cited
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