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31. 发明专利

JP2004200791A Packet communication system 有权
公开(公告)号：JP2004200791A
公开(公告)日：2004-07-15
申请号：JP2002364106
申请日：2002-12-16
申请人： Mitsubishi Electric Corp , 三菱電機株式会社
发明人： SUZUKI SHIGEAKI , FUSHIMI WATARU , OGAWA ISAMU
IPC分类号： H04L12/951 , H04L12/70 , H04L12/853 , H04L12/953 , H04M3/00 , H04L12/56
摘要： PROBLEM TO BE SOLVED: To provide a packet communication system that reduces the overhead of IP packets without causing increase in a voice transmission delay even when many VoIP terminals are connected to a network. SOLUTION: The packet communication system is provided with: a communication control apparatus 8 for searching an IP address corresponding to a destination telephone number when receiving an access request including the destination telephone number from a VoIP terminal; and a multiplex control apparatus 9 for particularizing a multiplex transmitter 11 or 10 managing the VoIP terminal related to the IP address searched by the communication control apparatus 8 and the multiplex transmitter 10 or 11 managing the VoIP terminal being a sender of the access request and informing both the multiplex transmitters 10 and 11 about the opposite multiplex transmitters 11, 10 and the IP address of the VoIP terminal. COPYRIGHT: (C)2004,JPO&NCIPI

32. 发明专利

JP2959353B2 Echo canceller device 失效
公开(公告)号：JP2959353B2
公开(公告)日：1999-10-06
申请号：JP22249693
申请日：1993-09-07
申请人：三菱電機株式会社
发明人： SUZUKI SHIGEAKI , NAITO HISASHI
IPC分类号： H04B3/23
CPC分类号： H04B3/23

33. 发明专利

JP2016004234A 音声再生装置および音声再生方法审中-公开
公开(公告)号：JP2016004234A
公开(公告)日：2016-01-12
申请号：JP2014126321
申请日：2014-06-19
申请人： MITSUBISHI ELECTRIC CORP , MITSUBISHI ELEC BUILDING TECHN
发明人： SUZUKI SHIGEAKI , FUSHIMI WATARU , YAMAURA TADASHI , WATANABE AKIHIKO , ETO MASAFUMI , MATSUEDA YUTAKA
IPC分类号： G10L21/043 , G10L21/047
摘要：【課題】符号化された音声を復号し、さらに話速変換を行う音声再生装置において、音声復号処理の一時的な演算量の増大を抑制する。【解決手段】符号化音声信号をあらかじめ設定された復号条件に基づいて復号する音声復号部1と、復号した音声信号を蓄積する蓄積部2と、蓄積された音声信号の音声信号波形の基本周期を算出し、算出した基本周期およびあらかじめ設定された話速に基づき音声信号波形の伸長または圧縮を行い、音声信号の再生速度を変換して出力音声信号を生成する話速変換部3と、話速変換部3が算出した音声信号波形の基本周期、およびあらかじめ設定された話速に基づき音声復号部1の復号条件を決定する復号動作制御部4とを備える。【選択図】図1

34. 发明专利

JPH09266456A ECHO CANCELER 失效
公开(公告)号：JPH09266456A
公开(公告)日：1997-10-07
申请号：JP7465596
申请日：1996-03-28
申请人： MITSUBISHI ELECTRIC CORP
发明人： ISHII TOMOKO , SUZUKI SHIGEAKI , HORIE NOBUYOSHI
IPC分类号： H04B3/23
摘要： PROBLEM TO BE SOLVED: To cancel echoes of a plurality of channels by controlling adapting operation by the channels. SOLUTION: An adapting operation control part 90 composites a pseudo-echo signal rz(i) by performing convolutional operation between a stored filter coefficient, updated by an FIR filter part 5z with an update signal from a filter coefficient update circuit 7z performing control so that ez(i) approximates 0 and yz(i) according to a select signal generated by limiting channels to be put in adapting operation at the same time among all the channels by samples according to a count value from a counter 160 increasing in count value in every cycle and a control signal from an AND circuit 15z which is generated by performing AND operation between transmit/receive signals xz(i)/yz(i) from transmit/receive signal input terminals 3z/1z and a detection signal generated by deciding whether or not there is a double-talk/soundless state from electric power of a residue signal ez(i) from a subtracter 6z. A subtracter 6z performs subtraction between xz(i) and rz(i) to generate e(z)i.

35. 发明专利

JPH02305231A ECHO CANCELLER 失效
公开(公告)号：JPH02305231A
公开(公告)日：1990-12-18
申请号：JP12713589
申请日：1989-05-19
申请人： MITSUBISHI ELECTRIC CORP
发明人： SUZUKI SHIGEAKI
IPC分类号： H04B3/23
摘要： PURPOSE:To prevent an echo path estimating error from being increased due to a delay in the detection of 2-way simultaneous talking state by correcting a register storing an impulse response estimate value of an echo path through the use of a preceding signal by (M-1)-sample. CONSTITUTION:Impulse response estimate values ho(j), h1(j),...,-hN-1(j)stored in a 2nd register are corrected by using a signal e(j-M-1) of the oldest sample among signals stored in a 3rd register and reception signals X(j-M+1), X(j-M),..., X(j-N-M+2) among those stored in the 1st register. When the correction is implemented by using the signal older by (M-1) sample and the value M is set properly, after the 2-way simultaneous talking state is started, the 2nd register correction till the state is detected uses the signal before the 2-way simultaneous talking state is started. Thus, the increase in the echo path estimating error is prevented.

36. 发明专利

JP2002252644A APPARATUS AND METHOD FOR COMMUNICATING VOICE PACKET 失效
公开(公告)号：JP2002252644A
公开(公告)日：2002-09-06
申请号：JP2001049307
申请日：2001-02-23
申请人： MITSUBISHI ELECTRIC CORP
发明人： SUZUKI SHIGEAKI
IPC分类号： H04L12/70 , H04M3/00 , H04Q1/45 , H04L12/56
摘要： PROBLEM TO BE SOLVED: To reduce a transmission delay in an entire apparatus caused by an unavoidable delay generated by delay elements such as low bit rate encoding, packetizing and transmission lines, etc., and additionally caused by a detecting delay by a DTMF detecting circuit 100 in a voice packet transmission using the low bit rate encoding. SOLUTION: A DTMF detecting part detects DTMF signals in a shorter time than a delay for encoding voice. In a receiving means, packets multiplexed by both voice signals and the DTMF signals are determined as the DTMF signals during a sound interval only when the packets are received the predetermined times or more from a start of the sound interval, otherwise the packets are determined as the voice signals.

37. 发明专利

JP2001358690A DIGITAL LINE MULTIPLEXING DEVICE 失效
公开(公告)号：JP2001358690A
公开(公告)日：2001-12-26
申请号：JP2001093635
申请日：2001-03-28
申请人： MITSUBISHI ELECTRIC CORP
发明人： FUSHIMI WATARU , SUZUKI SHIGEAKI
IPC分类号： H04M3/42 , G10L19/14 , H04B14/00 , H04J3/16 , H04J3/22 , H04L12/56 , H04L29/08 , H04M3/00
摘要： PROBLEM TO BE SOLVED: To solve the conventional problem that proper coding speed information cannot be transferred to a voice decoder, since the mismatching between the transmission speed of an actual coding voice signal and an allocated transmission speed on a bearer line occurs, when a tandem pass-through function is tried to be packaged on a DCME for coping with a variable speed. SOLUTION: By referring to coding speed information, included in a pseudo- voice signal, a coding voice signal that is extracted by a transmission speed decoder 19, or a coding voice signal where speed identification information is added by a coding speed information adder 30 is selected and is outputted to the bearer line.

38. 发明专利

JP2001308923A VOICE PACKET COMMUNICATION UNIT 失效
公开(公告)号：JP2001308923A
公开(公告)日：2001-11-02
申请号：JP2000126534
申请日：2000-04-26
申请人： MITSUBISHI ELECTRIC CORP
发明人： SUZUKI SHIGEAKI , FUSHIMI WATARU , EBISAWA HIDEAKI
IPC分类号： H04L29/06 , H04L12/70 , H04L29/08 , H04M11/00 , H04L12/56
摘要： PROBLEM TO BE SOLVED: To enhance a transmission efficiency by decreasing a size of IP packets. SOLUTION: Voice coders 10-1-10-n encode voice signals of each channel and sub packet header generating sections 20-1-20-n output a sub packet resulting from attaching a CODEC identifier to voice coded data. Voiced sound detector 30-1 to 30-n discriminate voiced/non-voiced signal of the voice signals of each channel and a common header generating section 7 generates a common header employing a multiplex bit map denoting a voiced/non-voiced state of each channel. A voice data multiplexer section 4 multiplexes the sub packet received from a channel discriminated to have a voiced sound and outputs an IP packet with the common header attached thereto.

39. 发明专利

JP2000307485A ECHO CANCELER 失效
公开(公告)号：JP2000307485A
公开(公告)日：2000-11-02
申请号：JP11387099
申请日：1999-04-21
申请人： MITSUBISHI ELECTRIC CORP
发明人： ISHII TOMOKO , SUZUKI SHIGEAKI
IPC分类号： H03H21/00 , H04B3/23 , H04M1/66 , H04M1/663
摘要： PROBLEM TO BE SOLVED: To suppress the rapid increase of processing load on an entire echo canceler when the transfer instruction of an adaptive filter coefficient is generated by inhibiting update processing of the adaptive filter coefficient in an adaptive filter in response to the coefficient transfer instruction. SOLUTION: A series of echo canceling operations are repeated for every cycle when a received code is received, and when an echo cancel characteristic of a semi-fixed filter 5 and an echo cancel characteristic of an adaptive filter 7 have a difference, a coefficient transfer is processed while stopping coefficient update processing of he adaptive filter 7 according to a coefficient transfer instruction. When the echo cancel characteristic of the semi-fixed filter 5 and the echo cancel characteristic of the adaptive filter 7 have no difference, coefficient update processing of the adaptive filter 7 is executed and an optimum filter coefficient at that point of time is calculated. The load increment by the transfer processing can be canceled by the reduction in the update processing of the adaptive filter coefficient.

40. 发明专利

JPH10285618A TONE SIGNAL DETECTOR 失效
公开(公告)号：JPH10285618A
公开(公告)日：1998-10-23
申请号：JP8676097
申请日：1997-04-04
申请人： MITSUBISHI ELECTRIC CORP
发明人： SUGINO YUKIMASA , SUZUKI SHIGEAKI , EBISAWA HIDEAKI
IPC分类号： H03D1/00 , H04L27/26 , H04M11/00 , H04Q1/444
摘要： PROBLEM TO BE SOLVED: To provide a tone signal detector capable of judging the presence/ absence of the amplitude modulation of tone signals. SOLUTION: A frequency selection means 100 eliminates noise components other than the tone signals of a detection object and a signal strength calculation means 101 calculates signal strength to the output of the frequency selection means 100. The signal strength is compared with a prescribed threshold value in a comparison means 102 and the presence/absence of the amplitude modulation is judged based on the frequency of generating the change point of the compared result in a judgement means 105. By configuring in such a manner, the presence/absence of the amplitude modulation of the tone signals is judged.

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