Patent EP0464839A2 successfully refreshed from Google Patents.
EP0464839A2
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EP
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Digitally multiplexed transmission system
Assignee: Fujitsu Ltd
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Filing: 1991-07-05
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Granted: —
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Expires: 2011-07-05
Abstract
Abstract The high performance multiplexed transmission system of this invention is configured by a sound coding unit (20) for coding voice input information by separating it into a core information part for assuring the minimum acceptable sound quality and a supplementary information part discardable in stages per the transmission priorities; a silence section detecting unit (21) for detecting silence sections of voice input information; and a multiplexing unit (22) for multiplexing only the information synchronizing with the correspondent's coder for the voice channels from which no sound is detected, or first core information part and second the supplementary information part from the ones with the highest priorities in stages in fixed length frames, for discarding the supplementary information parts which cannot be multiplexed because of a band deficiency.
Inventors
- 👤 Naoji Fujimo
- 👤 Mitsuru Tsuboi
- 👤 Shoji Tominaga
- 👤 Takao Matsuda
- 👤 Naomi Nishiyama
- 👤 Takahiro Aramaki
- 👤 Ken-Ichi Abiru
- 👤 Toshiaki Nobumoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 14:48
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04B; H04B1/00; H04B1/66; H04B1/667; H04J; H04J3/00; H04J3/16; H04J3/1682; H04J3/1688; H04J3/17; H04L; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L2012/5638; H04L2012/5671
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
228 words
A high performance digitally multiplexed transmission system for use in a multiplexing device for transmitting multiplexed signals on a digital line, said high performance digitally multiplexed transmission system comprising: a voice coding means for separating voice input information into a core information part for ensuring minimum acceptable sound quality and, in a supplementary information part, for sending supplementary information to be sent with said core information part for getting desirable sound quality, parts of said supplementary information part discardable in sequence according to the priorities, said voice coding means for coding said core information part and said supplementary information part; a detecting means for detecting a silence section in said voice input information; and a multiplexing means for multiplexing, among a plurality of voice channels to be multiplexed, only information necessary for synchronization with a correspondent's coder for a voice channel where said silence section detecting means detects a silence section, for multiplexing said core information part for a fixed length digital slot repeated at a predetermined cycle for a channel where said silence section detecting means detects no silence sections, for multiplexing said supplementary information part of each voice channel in the order of higher priority where no silence sections are detected for the remaining part of said fixed length digital slot, and for discarding a supplementary information part which cannot be multiplexed due to insufficient band.
Claim 2
Dependent Claim
83 words
A high performance digitally multiplexed transmission system according to claim 1 comprising a request band determining means for determining each transmission request band for voice input information for a plurality of voice channels to be multiplexed in said digital line, wherein: a supplementary information part within a request band determined by said request band determining means is discarded in the order of lower priority when a supplementary information part of each voice channel where said multiplexing means detects no silence sections is discarded.
Claim 3
Dependent Claim
68 words
A high performance digitally multiplexed transmission system according to claim 1 or 2 comprising a call detecting means for detecting a call in each of a plurality of said voice channels to be multiplexed, wherein: said multiplexing means does not transmit any coding information including any information required for synchronization with said correspondent's coder specifically for a voice channel where said call detecting means detects a calling mode.
Claim 4
Dependent Claim
55 words
A high performance digitally multiplexed transmission system according to claim 1, 2, or 3 comprising a packet assembling means for assembling a packet using a multiplexed frame provided by said multiplexing means "as is" or in a divided form, wherein: said multiplexing device applies said packet to the label multiplexing network connected to users' devices.
Claim 5
Dependent Claim
113 words
A high performance digitally multiplexed transmission system according to claim 1, 2, 3, or 4 comprising a node control part, in said multiplexing device, for providing a multiplexing parameter based on the nature of sound quality deterioration due to the discard of said supplementary information part which depends on the characteristics of each coder for a plurality of voice channels to be multiplexed in said digital line, and for setting said multiplexing parameter in said multiplexing means, wherein: said multiplexing means determines the method of discarding a supplementary information part in the current transmission frame according to said multiplexing parameter and the discard history of the supplementary information in the preceding transmission frame.
Claim 6
Dependent Claim
100 words
A high performance multiplexing transmission system according to claim 1, 2, 3, 4, or 5 in said multiplexing device that multiplexes transmission information of data channels, being other media, including data terminals in addition to a plurality of voice channels and transmits said multiplexing signals in a digital line, said system comprising: a significant information detecting part for detecting the necessity of information transmission for each of said data channels, wherein: said multiplexing means multiplexes for a plurality of said voice channels after multiplexing transmission information of data channels which said significant information detecting part considers necessary to be transmitted.
Claim 7
Dependent Claim
141 words
A high performance digital multiplexing system according to claim 1, 2, 3, 4, or 5 in said multiplexing device that multiplexes transmission information of data channels including data terminals and packet data from a packet switching system in addition to a plurality of voice channels and transmits said multiplexing signals in a digital line, said system comprising: a significant information detecting part for detecting the necessity for information transmission for each of said data channels, wherein: said multiplexing means reserves a minimum throughput guarantee value of said packet switching system, multiplexes transmission information of data channels which said significant information detecting part considers necessary to be transmitted and packet data of the minimum throughput in said packet switching system, multiplexes for a plurality of said voice channels, and multiplexes packet data in the remaining part of said fixed length digital slot.
Claim 8
Dependent Claim
70 words
A high performance digitally multiplexed transmission system according to claim 1, 2, 3, 4, 5, 6, or 7 wherein: said voice coding means comprises a sub-band coder; and a multiplexing part forming said multiplexing process means selectively discards a core information part corresponding to the specific frequency component when said multiplexing part cannot transmit all core information parts for each of said voice channels where no silence sections are detected.
Claim 9
Dependent Claim
69 words
A high performance digitally multiplexed transmission system according to claim 8, wherein: said voice coding means comprises a sub-band coder; a multiplexing part forming said sub-band coder or said voice multiplexing means detects the voice frequency characteristics of each of said voice channels; said multiplexing part performs a multiplexing process including selective discard of said core information part based on the discard mode corresponding to the detected frequency characteristics.
Claim 10
Dependent Claim
54 words
A high performance digital multiplexing system according to claim 1, 2, 3, 4, 5, 6, 7, or 8, wherein: said multiplexing means reserves a code table for coding a transmission band, and codes the transmission information band for each channel in a transmission frame, said transmission information being actually transmitted through said digital line.
Claim 11
Dependent Claim
74 words
A high performance digital multiplexing system according to claim 1, 2, 3, or 4 in said multiplexing device which notifies a correspondent's multiplexing device of the pending mode of said channel when detecting a channel in the pending mode among a plurality of said voice channels, wherein: said correspondent's multiplexing device outputs a built-in-pending-sound pattern and attempts to compress transmission when detecting the silence mode on a relay transmission line between said multiplexing devices.
Claim 12
Dependent Claim
103 words
A high performance digitally multiplexed transmission system according to claim 1, 2, 3, or 5 in said multiplexing device which comprises various transmission media for transmitting voice, for example, wherein: a coder forming said voice coding means encodes after arbitrating the number of bits in a core information part, for assuring information quality necessary for respective transmission media, where a coding method or discarding may not be admitted depending on the nature of each medium; and a multiplexing part forming said multiplexing process part performs a multiplexing process corresponding to each of transmission media according to a request from each of said encoders.
Claim 13
Dependent Claim
104 words
A high performance digitally multiplexed transmission system according to claim 1, 2, 3, or 4 for avoiding deterioration of sound quality by stopping the operation of a voice detector or ignoring the detecting result of said voice detector when said multiplexing device or switching system detects the number of channels where calls are connected among a plurality of voice channels and it is not necessary to discard said supplementary information part or when the sound quality deterioration due to the discard of said supplementary information part is less than that due to the operation of the voice detector forming said silence section detecting means.
Claim 14
Dependent Claim
108 words
A high performance digitally multiplexed transmission system according to claim 1, 2, 3, or 4, wherein: said multiplexing device or a switching system originating information collects data on the number of channels connected to calls in switching systems relaying said information in a label multiplexed network such as said packet network or ATM network via a communication path opposite to the direction for transmitting information; and unnecessary sound quality deterioration can be avoided by stopping the operation of a voice detector forming said silence section detecting means when a discard of said supplementary information part is not required or by ignoring the detection result of said voice detector.
Claim 15
Dependent Claim
159 words
A high performance digitally multiplexed transmission system according to claim 1, 2, 3, or 4, wherein: line sets forming said voice coding means and silence section detecting means outputs one multiplexed unit of multiplexed data in said line sets and information indicating the necessity of transmission of said data or indicating a transmission request band; said multiplexing process means first takes the information indicating the necessity of transmission of said data or indicating a transmission request band, and comprises a band arbitrating part for determining a transmission band for each channel according to said information and a pipeline multiplexing part for obtaining data after dividing one multiplexed unit of multiplexed data from said line sets into a plurality of split data groups according to the result provided by said band arbitrating part and for multiplexing and transmitting said divided data groups every time information is obtained; and delay time can be greatly reduced in association with the multiplexing operation.
Claim 16
Dependent Claim
86 words
A high performance digitally multiplexed transmission system according to claim 15, for greatly reducing lags associated with demultiplexations, wherein: said multiplexing process means first restores the information indicating the transmission band of each channel from one multiplexed unit of multiplexed data in said line sets received through the transmission line: said high performance digitally multiplexed transmission system further comprising: a pipeline demultiplexing part for demultiplexing data into groups in the order of their multiplexations according to said restored information and outputting them to said line sets.
Claim 17
Dependent Claim
39 words
A high performance digitally multiplexed transmission system according to claim 15 or 16, wherein: said line sets comprises line sets for a data channel in addition to line sets forming said voice coding means and silence section detecting means.
Claim 18
Dependent Claim
78 words
A high performance digitally multiplexed transmission system according to claim 1, 2, 3, or 4, wherein: the determination result of detecting speech/silence sections by a voice detector forming said silence section detecting means is sent simultaneously to a coder forming said voice coding means and a multiplexing part forming said multiplexing process means; and voice information quality can be protected without increasing delay time of voice information longer than the time required for voice coding by said coder.
Claim 19
Dependent Claim
95 words
A high performance digitally multiplexed transmission system according to claim 1, 2, 3, or 4, wherein: a voice detector forming said silence section detecting means measures the noise level on the sending side for the voice channel where a silence section is detected; said multiplexing process means multiplexes, in addition to the information required for synchronization with a correspondent's coder, the information indicating said noise level for said fixed length digital slot for said channel; and noise is generated for a silence section on the receiving side according to the information indicating said noise level.
Claim 20
Dependent Claim
87 words
A call detecting method in a voice multiplexing device, a multi-media multiplexing device, and a switching system that transmits signaling information of a voice channel as a signal-send (SS) signal and a signal-receive (SR) signal, wherein: said call detecting system detects the calling mode or non-calling-mode of said voice channel based on the time period showing a certain value of logical OR or logical product while monitoring said SS and SR signals and after obtaining the logical OR and logical product of said SS and SR signals.
Claim 21
Independent Claim
82 words
A method for transmitting compressed information in a voice multiplexing device, a multi-media multiplexing device, and a switching system that transmits signaling information of a voice channel as a signal-send (SS) signal and a signal-receive (SR) signal, wherein: said method for transmitting compressed information transmits a transmission frame with a flag indicating whether or not said SS signal is to be transmitted for a certain transmission cycle unit, and to compress the transmission of signaling information where said SS signal remains unchanged.
Claim 22
Independent Claim
87 words
A method for transmitting compressed information in a multi-media multiplexing device or a switching system for transmitting a level signal for accommodated data channels to confirm the mode between a correspondent as a remote signaling (RS) signal, wherein: said method for transmitting compressed information is used to transmit a transmission frame with a flag indicating whether or not said RS signal is to be transmitted for a certain transmission cycle unit, and to compress the transmission of remote signaling information where said RS signal does not change.
Claim 23
Dependent Claim
181 words
A high performance digitally multiplexed transmission system for use in a multiplexing device for transmitting multiplexed signals on a digital line, said high performance digitally multiplexed transmission system comprising: a voice coding means for separating voice input information into a core information part for ensuring minimum acceptable sound quality and, in a supplementary information part, for sending supplementary information to be sent with said core information part for getting desirable sound quality, parts of said supplementary information part discardable in sequence according to the priorities, said voice coding means for coding said core information part and said supplementary information part; and a multiplexing means for multiplexing said core information part for a fixed length digital slot repeated at a predetermined cycle for a channel where said silence section detecting means detects no silence sections, for multiplexing said supplementary information part of each voice channel in the order of higher priority where no silence sections are detected for the remaining part of said fixed length digital slot, and for discarding a supplementary information part which cannot be multiplexed due to insufficient band.
Claim 24
Dependent Claim
228 words
A high performance digitally multiplexed transmission system for use in a switching system for transmitting multiplexed signals on a digital line, said high performance digitally multiplexed transmission system comprising: a voice coding means for separating voice input information into a core information part for ensuring minimum acceptable sound quality and, in a supplementary information part, for sending supplementary information to be sent with said core information part for getting desirable sound quality, parts of said supplementary information part discardable in sequence according to the priorities, said voice coding means for coding said core information part and said supplementary information part; a detecting means for detecting a silence section in said voice input information; and a multiplexing means for multiplexing, among a plurality of voice channels to be multiplexed, only information necessary for synchronization with a correspondent's coder for a voice channel where said silence section detecting means detects a silence section, for multiplexing said core information part for a fixed length digital slot repeated at a predetermined cycle for a channel where said silence section detecting means detects no silence sections, for multiplexing said supplementary information part of each voice channel in the order of higher priority where no silence sections are detected for the remaining part of said fixed length digital slot, and for discarding a supplementary information part which cannot be multiplexed due to insufficient band.
Claim 25
Dependent Claim
246 words
A high performance digitally multiplexed transmission system for use in a multiplexing device for transmitting multiplexed signals on a digital line, said high performance digitally multiplexed transmission system comprising: an image coding means for separating image input information into a core information part for ensuring minimum acceptable image quality and, in a supplementary information part, for sending supplementary information to be sent with said core information part for getting desirable image quality, parts of said supplementary information part discardable in sequence according to the priorities, said image coding means for coding said core information part and said supplementary information part; a request band determining means for determining a transmission band of said image input information for determining the band necessary for transmitting image information; a multiplexing means for multiplexing, among a plurality of image channels to be multiplexed, only information necessary for synchronization with a correspondent's coder for an image channel where said request band determining means determines it is necessary to transmit images, for multiplexing said core information part for a fixed length digital slot repeated at a predetermined cycle for a channel where said request band determining means determines it is necessary to transmit images, for multiplexing said supplementary information part of each image channel in the order of higher priority where it is determined necessary to transmit images for the remaining part of said fixed length digital slot, and for discarding a supplementary information part which cannot be multiplexed due to insufficient band.
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