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1. 发明专利

JPH0530224A MULTIPLEXER 失效
公开(公告)号：JPH0530224A
公开(公告)日：1993-02-05
申请号：JP18266891
申请日：1991-07-23
申请人： NEC CORP , NIPPON ELECTRIC ENG
发明人： WAKE YASUHIRO , USU KATSUNORI
IPC分类号： H04M3/00 , H04M7/00 , H04N1/00 , H04N1/32 , H04Q11/04
摘要： PURPOSE:To attain high speed transmission without fall-back of a G3 facsimile signal by using a selector to select a transmission line by voice 2 channels into a transmission line by one facsimile channel. CONSTITUTION:The system is provided with a multiplexer 6 multiplexing plural outputs of voice coders 2, 3, a facsimile signal detector 5 detecting it that a facsimile signal is inputted, and a selection changeover device 7 selecting a digital facsimile signal in the coding voice signal and the digital facsimile signal entered and multiplexed in response to the output of the facsimile signal detector 5 and outputting the selected signal to a digital line 8. After digital output signals of the plural voice codes 2, 3 are multiplexed, a facsimile signal demodulator 4 is selected. Thus, even in the case of the voice coders 2, 3 in which the voice signal is coded in a low bit rate less than 2 channels or over, the voice coder of 2 channels or over is allocated for a facsimile signal.

2. 发明专利

JPH02228817A VOICE CODING DEVICE 失效
公开(公告)号：JPH02228817A
公开(公告)日：1990-09-11
申请号：JP5044989
申请日：1989-03-02
申请人： NEC CORP , NIPPON ELECTRIC ENG
发明人： WAKE YASUHIRO , USU KATSUNORI
IPC分类号： H03M1/10
摘要： PURPOSE:To prevent the exchange of an opposite station from acquiring a channel under test by providing an opposite station origination restricting means restricting the origination to an opposite station exchange based on the start of a self-diagnostic test. CONSTITUTION:When a segmenting test start switch 1 is turned on and a segmenting test is started, an adder 2 adds an opposite station channel panel closing signal to a signaling signal SS from its own station exchange and outputs the result as a signaling signal SS0 to an opposite station exchange. On the other hand, an adder 3 adds an opposite station channel panel closing signal to a signaling signal SRI from the opposite station exchange and outputs the result as a signaling signal SR to its own station exchange. Thus, the origination is restricted not only to its own station but also to an opposite station exchange at the self-diagnostic test of a voice channel panel, and the disadvantage of the opposite station exchange acquiring a channel during the test is avoided and the self-diagnostic test of a faulty channel panel is implemented without giving a fault to its operation.

3. 发明专利

JPS62104221A DRIFT COMPENSATION CIRCUIT FOR A/D CONVERTER 失效
公开(公告)号：JPS62104221A
公开(公告)日：1987-05-14
申请号：JP24452085
申请日：1985-10-30
申请人： NEC CORP , NIPPON ELECTRIC ENG
发明人： FUDA HITOSHI , USU KATSUNORI
IPC分类号： H03M1/10
摘要： PURPOSE:To eliminate the need for a detection circuit of a digital value '0' and a latch circuit and to simplify the circuit constitution by applying drift compensation as the result of AND between the state of a sign bit of an A/D converter and an output of a drift compensation control circuit so as to easily change the compensation quantity. CONSTITUTION:An output sign bit (e) of an A/D converter 1 and an output (j) of a drift compensation control circuit 3 are ANDed by a sign bit discrimination circuit 2 and the output of the sign bit discrimination circuit 2 is sign but discrimination signal k='1' and l='0'. A switch circuit 4 is turned on by the output and an output voltage i is a negative voltage -V. The output Vi is inputted to an integration circuit 5, where it is integrated and its output is Vo. A comparator (built-in) input of the A/D converter 1 receives the negative voltage Vo outputted from the integration circuit 5 and becomes a negative voltage and the output of the A/D converter 1 approaches a digital value '0' at the next A/D conversion. This is similar when the drift is negative.

4. 发明专利

JPH0819076A HIGH EFFICIENCY VOICE CODING/DECODING DIGITAL ONE-LINK RELAY EXCHANGE SYSTEM 失效
公开(公告)号：JPH0819076A
公开(公告)日：1996-01-19
申请号：JP15107594
申请日：1994-07-01
申请人： NIPPON ELECTRIC ENG , NEC CORP
发明人： WAKE YASUHIRO , USU KATSUNORI
IPC分类号： H04Q11/04 , H04M7/00
摘要： PURPOSE:To attain relay exchange for one digital link with high efficiency voice coding and decoding through one coding and decoding without repeating coding/decoding even when relay exchange is made by a conventional digital exchange not an exclusive relay exchange having a function of passing-through changeover device of a coding/decoding means and a function of changeover control of a decoding means and a speed conversion means. CONSTITUTION:The high efficiency voice coding decoding digital onelink relay exchange system is provided with a digital exchange 2 having a relay exchange function and plural high efficiency voice coders 3-1-3-3 which have a function of inserting a sine wave of a prescribed frequency to a main signal sent to the digital exchange 2 and of monitoring whether or not the sine wave of the prescribed frequency is inserted to the main signal received from the digital exchange 2 and applying path-through circuit to a coding and decoding means and a function of applying changeover control to the coding decoding means and a velocity conversion means.

5. 发明专利

JPH07107050A HIGH-EFFICIENCY VOICE ENCODER AND REPEATING EXCHANGE SYSTEM USING THE SAME 失效
公开(公告)号：JPH07107050A
公开(公告)日：1995-04-21
申请号：JP25204593
申请日：1993-10-08
申请人： NEC CORP , NIPPON ELECTRIC ENG
发明人： YASUNAGA SATOSHI , USU KATSUNORI
IPC分类号： G06F5/06 , H04B14/04 , H04J3/08
摘要： PURPOSE:To evade the repetition of high-efficiency voice encoding and decoding without using an exclusive repeating exchange and to enable the repeating exchange of a digital 1 link in a system for exchanging the subscriber line and trunk line of digital voice signals through a high efficiency voice encoder. CONSTITUTION:Relay channels 31 and 32 are respectively housed in an exchange 20 and the two high efficiency voice encoders 11 and 12 opposing with each other through a relay path mutually insert prescribed synchronizing signals to output signals to an opposite party through the exchange in a synchronization insertion part 104 and detect the synchronizing signals in a synchronization detection part 105. In the meantime, a first speed conversion part 103 adds invalid signals for increasing a bit rate and making intraexchange transmission possible to high efficiency encoded voice signals from the relay channels and a second speed conversion part 106 eliminates the invalid signals. At the time of detecting the synchronizing signals, selectors 107 and 108 bypass an encoding part 101 and a decoding part 102 through the speed conversion parts.

6. 发明专利

JPH04104552A LINE CONNECTING DEVICE 失效
公开(公告)号：JPH04104552A
公开(公告)日：1992-04-07
申请号：JP22160190
申请日：1990-08-23
申请人： NEC CORP , NIPPON ELECTRIC ENG
发明人： WAKE YASUHIRO , USU KATSUNORI
IPC分类号： H04M3/36
摘要： PURPOSE:To keep voice quality in the best state to perform communication by selecting a voice encoding system in accordance with the line use condition of a telephone exchange. CONSTITUTION:When a call is originated from a telephone exchange 1, a control part 10 calls a storage part 4 where the line use rate for a certain past time is stored; and when the use rate is higher than 50%, the control part 10 controls an encoding system selecting part 5 and a line connection part 9 to select a 16kbps voice encoding device 6 and connects the device to a high-speed digital line 20. When the line use rate is 25 to 50%, the control part 10 controls the encoding system selecting part 5 and the line connection part 9 to select a 32kbps voice encoding device 7; and when the line use rate is lower than 25%, the control part 10 controls the encoding system selecting part 5 and the line connection part 9 to select a 64kbps voice encoding device 8. Thus, saturation of the encoded voice quality for a certain bit rate or higher in the adopted encoding system is prevented.

7. 发明专利

JPH0414357A DIGITAL I LINK RELAY EXCHANGE SYSTEM FOR VOICE CODING DEVICE 失效
公开(公告)号：JPH0414357A
公开(公告)日：1992-01-20
申请号：JP11709090
申请日：1990-05-07
申请人： NEC CORP , NIPPON ELECTRIC ENG
发明人： WAKE YASUHIRO , USU KATSUNORI
IPC分类号： H04M7/00
摘要： PURPOSE:To prevent production of noise caused at out of frame synchronism at relay exchange by unlocking frame synchronization of an opposite decoder completely with a silent coding data and transmitting an input data. CONSTITUTION:A changeover device 10 selects a B input for a time or over (forward protection time or over) when frame synchronization of a decoder 20 is unlocked by the control of a timer circuit 12 and after a silent coding data generator 11 sends a silent coding data without a frame synchronization bit, the changeover device 10 selects a C input and a data from a digital line exchange 1 is outputted in a transparent way. In the case of line connection from a telephone set 6 to a telephone set 4, similar switching selection is controlled to changeover devices 16 and 10.

8. 发明专利

JPH03267850A AUTOMATIC DIAGNOSTIC TEST SYSTEM FOR VOCODER 失效
公开(公告)号：JPH03267850A
公开(公告)日：1991-11-28
申请号：JP6657390
申请日：1990-03-16
申请人： NEC CORP , NIPPON ELECTRIC ENG
发明人： WAKE YASUHIRO , USU KATSUNORI
IPC分类号： H04M3/22 , H04M3/26
摘要： PURPOSE:To attain diagnostic test of a voice channel panel and a line without giving a hindrance to the operation by detecting an idle state of the voice channel panels periodically and restricting dialing to its own station and an opposite station exchange when an idle panel exists so as to conduct the diagnostic test. CONSTITUTION:The system is provided with monitor means 1, 4 monitoring a connection signal from its own station exchange and a connection signal from an opposite station exchange to detect an idle state of a voice channel panel in a VOCODER and a dialing restriction means 2, 5 restricting dialing to its own station exchange and the opposite station exchange so as not to acquire the voice channel panel under the diagnostic test. In this case, a connection signal 7 from its own station exchange and a connection signal 9 from the opposite station exchange are monitored and when any of the panels is busy, an opposite station exchange closing switch 3 and its own station exchange closing switch 6 are not started. Thus, the automatic diagnostic test is executed in the idle state of the panel during operation and the diagnostic test is conducted without giving any hindrance to the line.

9. 发明专利

JPH08130512A VOICE CODING/DECODING DEVICE 失效
公开(公告)号：JPH08130512A
公开(公告)日：1996-05-21
申请号：JP26960694
申请日：1994-11-02
申请人： NIPPON ELECTRIC ENG , NEC CORP
发明人： HARADA RYOICHI , USU KATSUNORI
IPC分类号： G10L19/02 , G10L19/00 , H03M7/30 , H04B14/04 , G10L9/14 , G10L9/18
摘要： PURPOSE: To change coding and decoding bit rates in calling in accordance with the quantity of a telephone call in a highly efficient voice coding/decoding device based upon vector quantization. CONSTITUTION: A voice coding device 1 is provided with a bit rate controller 10 for outputting bit rate control signals b-1 to b-N and bit rate control information (c) based upon signaling signal a-1 to a-N, plural voice coders 11-1 to 11-N for respectively encoding digital sound signals d-1 to d-N while being respectively controlled by the signals b-1 to b-N and a multiplexer 12 for multiplexing the information (c) and encoded sound signals e-1 to e-N. A sound decoding device 3 is provided with a multiplex separator 30 for separating a multiplex signal (g) into bit rate control information (j) and encoded sound signals h-1 to h-N, a bit rate controller 31 for outputting bit rate control signals k-1 to k-N and signaling signals m-1 to m-N from the information (j) and plural sound decoders 32-1 to 32-N for respectively decoding the signals h-1 to h-N while being respectively controlled by the control signals k-1 to k-N.

10. 发明专利

JPH05244302A 失效
公开(公告)号：JPH05244302A
公开(公告)日：1993-09-21
申请号：JP4146392
申请日：1992-02-27
申请人： NEC CORP , NIPPON ELECTRIC ENG
发明人： WAKE YASUHIRO , USU KATSUNORI
IPC分类号： H04J3/00 , H04M11/00 , H04M11/06 , H04N1/00
摘要： PURPOSE:To attain high speed transmission of a facsimile signal when both a voice signal and the facsimile signal are sent. CONSTITUTION:A voice coder 17, a G3 facsimile demodulator 18, a G3 facsimile signal detector 19, a frame synchronization generator 21, a G3 control frame generator 22 and a multiplexer 23 are arranged in a coding section 12 connecting to an input terminal 11. When a facsimile signal is sent to a digital line 15, a G3 facsimile identification data are integrated in the frame. Furthermore, when G3 facsimile high speed data are sent, a special frame is inserted just before the data and the result is sent. An output of a voice decoder 25 or an output of a G3 facsimile modulator 26 in a decoding section 14 is outputted from a changeover device 29 to an output terminal 13.

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