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41. 发明专利

JPH10233845A TONE SIGNAL DETECTOR 失效
公开(公告)号：JPH10233845A
公开(公告)日：1998-09-02
申请号：JP3787197
申请日：1997-02-21
申请人： MITSUBISHI ELECTRIC CORP
发明人： SUGINO YUKIMASA , SUZUKI SHIGEAKI , EBISAWA HIDEAKI
IPC分类号： H04Q1/45 , H04M11/00
摘要： PROBLEM TO BE SOLVED: To obtain the tone signal detector that discriminates whether or not a tone signal is amplitude-modulated. SOLUTION: A frequency selection means 100 eliminates a noise component other than a tone signal being a detection object and a signal intensity calculation means 101 calculates the signal intensity of the output of the frequency selection means 100. Delay buffers 102-1, 102-2, 102-3 delay a signal representing the signal strength, and a 1st characteristic amount extract means 103 and a 2nd characteristic amount extract means 104 calculate respectively a maximum value and a minimum value from each output of the signal intensity calculation means 101 and the delay buffers 102-1, 102-2, 102-3. A discrimination means 105 discriminates whether or not a tone signal is amplitude-modulated based on the maximum value and the minimum value. Through the constitution above, whether or not the tone signal is amplitude-modulated is discriminated.

42. 发明专利

JPH0622051A LINE MULTIPLEXING TRANSMISSION EQUIPMENT 失效
公开(公告)号：JPH0622051A
公开(公告)日：1994-01-28
申请号：JP17406792
申请日：1992-07-01
申请人： MITSUBISHI ELECTRIC CORP
发明人： SUZUKI SHIGEAKI , NAITO HISASHI , FUSHIMI WATARU
IPC分类号： H04M11/00 , H04J3/16 , H04M11/06 , H04N1/00 , H04N1/333
摘要： PURPOSE:To contain the same number of input telephone lines as the case of estimating that all the input signals are voice signals at the voice/facsimile signal line multiplexing transmission equipment. CONSTITUTION:A transmission line allocation control part 9 outputs a data transmission rate designating signal to a facsimile procedure operation part 10 corresponding to the load of the transmission line. The facsimile procedure operation part 10 operates the facsimile procedure so that facsimile base band data transmission rate can be the rate designated by the data transmission rate designating signal by reloading a control signal used for facsimile procedure control or selectively failing training performed before message transmission. Since the facsimile base band data transmission rate is controlled corresponding to the load of the transmission line, the same number of input telephone lines as the case of estimating that all the input signals are voice signals can be contained.

43. 发明专利

JP2002314596A PACKET COMMUNICATION SYSTEM 失效
公开(公告)号：JP2002314596A
公开(公告)日：2002-10-25
申请号：JP2001112488
申请日：2001-04-11
申请人： MITSUBISHI ELECTRIC CORP
发明人： OGAWA ISAMU , FUSHIMI WATARU , SUZUKI SHIGEAKI
IPC分类号： H04L12/951 , H04L12/70 , H04L12/805 , H04L12/853 , H04M3/00 , H04M11/00 , H04L12/56
摘要： PROBLEM TO BE SOLVED: To provide a packet communication system that regulates a time required for transmission of a nonreal time packet so as to prevent a transmission delay of a real time packet from being increased. SOLUTION: The packet communication system is provided with a voice detection section 1 that detects input of a voice signal (real time information), a voice coding section 2 that applies high efficiency coding to a voice signal, a voice packet generating section 3 that assembles a voice signal subjected to high efficiency coding into packets, a voice packet storage buffer 4 that stores the generated packets, a data packet generating section 8 that assembles a data signal (nonreal time information) into packets, a data packet storage buffer 9 that stores the generated packets, a channel control section 5 that transmits the packets stored in the packet storage buffers 4, 9 to a communication network, and a data packet length revision section 7 that decides the length of the packet generated by the data packet generating section 8 on the basis of information of a coded frame period when the voice detection section 1 detects the voice signal and the voice coding section 2 conducts high efficiency coding.

44. 发明专利

JP2001318693A DEVICE AND METHOD FOR TRANSMISSION 失效
公开(公告)号：JP2001318693A
公开(公告)日：2001-11-16
申请号：JP2000135162
申请日：2000-05-08
申请人： MITSUBISHI ELECTRIC CORP
发明人： SUGINO YUKIMASA , NAITO HISASHI , SUZUKI SHIGEAKI
IPC分类号： H04N1/32 , G10L19/00 , H04L1/00 , H04M7/00 , H04M11/00
摘要： PROBLEM TO BE SOLVED: To solve the problem encountered in normal transmission of modem signals by a high speed modem. SOLUTION: For example, at least two kinds of transmission systems are prepared including conventional 32 kbits/s 40 kbits/s ADPCM systems with a clear channel that is capable of normally transmitting modem signals by a high speed modem. When ANSam signals based on V. 8 procedures are detected from input signals by an ANSam signal detector 23, a transmission assignment processor 24 instructs a BC bit assignment section 26 so that an operation is switched over to a higer quality transmission system.

45. 发明专利

JP2000029668A METHOD AND DEVICE FOR ROUNDING DATA 失效
公开(公告)号：JP2000029668A
公开(公告)日：2000-01-28
申请号：JP19843398
申请日：1998-07-14
申请人： MITSUBISHI ELECTRIC CORP
发明人： SUZUKI SHIGEAKI
IPC分类号： G06F7/38
摘要： PROBLEM TO BE SOLVED: To eliminate the need to judge whether or not data before rounded are plus or minus by discarding the low-order (m) bits of (n)-bit data obtained by adding the data before rounding and data after composition together and obtaining the result as a rounded result. SOLUTION: A register 101 holds (n)-bit data before rounding. A register 102 is an (n-m)-bit register, where '0's are stored as all bits. Further, an (n)-bit adder 103 adds two pieces of (n)-bit data. One of them is the data before rounding held in the register 101. The other (n)-bit data are data composed of the output of the register 102 as the high-order (n-m) bits and the high-order (m) bits of the register 101 as the low-order (m) bits. The addition result outputted by this (n)-bit adder 103 is held in a register 104 and its high-order (n-m) bits are the rounded result.

46. 发明专利

JPH11243396A VOICE ENCODING TRANSMISSION SYSTEM 失效
公开(公告)号：JPH11243396A
公开(公告)日：1999-09-07
申请号：JP4481998
申请日：1998-02-26
申请人： MITSUBISHI ELECTRIC CORP
发明人： YAJIMA HISASHI , SUZUKI SHIGEAKI , SUGINO YUKIMASA , EBISAWA HIDEAKI
IPC分类号： G10L19/00 , H03M7/30 , H04L12/28 , H04L12/56 , H04L12/66 , G10L9/00
摘要： PROBLEM TO BE SOLVED: To provide a voice encoding transmission system by which high quality voice transmission is attained when a transmission network where silence compression is executed is connected to an existing transmission network without silence compression. SOLUTION: This system is provided with a transmission end 10 for processing the sound section of an original voice signal by encoding and also outputting a first voice code generated by silence compression to a first transmission path A, a relay node 20 for outputting to a second transmission path B a second voice code which is generated by interpolating background noises in the silence section of the original voice signal based on the first voice code received from the first transmission path A, and a reception end 30 for processing the second voice code received from the second transmission path B by decoding and reproducing the original voice signal. Here, an internal state at the time of a processing by encoding in the transmission end 10 is made to coincide with the internal state at the time of the processing by decoding in the reception end 30.

47. 发明专利

JPH10257584A ECHO CANCELLER 失效
公开(公告)号：JPH10257584A
公开(公告)日：1998-09-25
申请号：JP5175097
申请日：1997-03-06
申请人： MITSUBISHI ELECTRIC CORP
发明人： ISHII TOMOKO , SUZUKI SHIGEAKI
IPC分类号： H04R3/02 , H03H17/02 , H03H21/00 , H04B3/23 , H04B7/015
摘要： PROBLEM TO BE SOLVED: To realize an echo signal cancellation system with a reduced hardware scale whose convergence speed is improved independently of the frequency roll-off characteristics of an A/D converter and a D/A converter. SOLUTION: A residual signal e (i) through a subtrator 6 which applies the substation to a transmission signal x (i) through a terminal 3 used for superimposing an echo signal of which an input/output reception signal y (i) through terminals 1/2 is generated in a sneak echo path on a transmitter side speech signal and a pseudo echo signal r (i) passing via an inverse flat filter 9 through a finite length impulse response(FIR) filter part 5 is outputted to a terminal 4 and by using an adaptive filter coefficient update section 7, coefficient adaptive update processing with a flattened reception signal y (i)' through a reception signal buffer 51 of the FIR filter part 5 is applied to the signal e (i) to update the signal e (i) sequentially. An integration device 53 applied convolution arithmetic operation to the filter coefficient stored in a coefficient buffer 52 of the FIR filter part 5 and the flattened reception signal y (i)' stored in the reception signal buffer 51 via a flattened filter 8 to synthesize a flattened pseudo echo signal r (i)'.

48. 发明专利

JPH10243204A FACSIMILE SIGNAL TRANSMITTER AND FACSIMILE SIGNAL TRANSMISSION METHOD 失效
公开(公告)号：JPH10243204A
公开(公告)日：1998-09-11
申请号：JP4674697
申请日：1997-02-28
申请人： MITSUBISHI ELECTRIC CORP
发明人： HORIE NOBUYOSHI , SUZUKI SHIGEAKI
IPC分类号： H03M7/30 , H04M11/00 , H04N1/32 , H04N1/327 , H04N1/41
摘要： PROBLEM TO BE SOLVED: To prevent the occurrence of a communication error and significant deterioration in an image by outputting an oldest facsimile signal to a receiver side facsimile terminal among facsimile signals stored in a storage means, upon the receipt of a frame detection signal denoting it that frame data have been aborted during transmission. SOLUTION: Upon the receipt of a frame detection signal denoting it that frame data are aborted during transmission, a facsimile signal which is equivalent to the oldest facsimile signal among facsimile signals stored in decoded data storage sections 30, 41 is outputted to modems 22, 33. Then even when frame data including control data required for facsimile communication are aborted in transmission lines 28, 39, the facsimile signal which are originally to have been sent to facsimile terminals 21, 32 is outputted to the modems 22, 33, resulting in that the occurrence of a communication error in the facsimile terminals 21, 32 is prevented.

49. 发明专利

JPH10240297A ACOUSTIC SIGNAL ENCODING DEVICE 失效
公开(公告)号：JPH10240297A
公开(公告)日：1998-09-11
申请号：JP29457597
申请日：1997-10-27
申请人： MITSUBISHI ELECTRIC CORP
发明人： WADA TETSURO , SUZUKI SHIGEAKI , EBISAWA HIDEAKI , SUGINO YUKIMASA , NAITO HISASHI
IPC分类号： G10L19/02 , H03M7/30 , G10L7/04
摘要： PROBLEM TO BE SOLVED: To obtain an acoustic signal encoding device whose quality is aurally high by suppressing quantization bits from being dispersed into plural subbands while controlling a transmission band to prevent the generation of a quantization distortion from being increased and to perform a high-quality encoding and to suppress a distortion at the time of a low bit rate from being generated. SOLUTION: A band dividing part 1 divides an inputted digital signal into N pieces of subband signals. A band control part 4A performs the spectrum analysis of the input signal to outputs a control signal for controlling the transmission band by prohibiting bit assignments to specified bands based on the analysis result. A bit assigning part 2A prohibits the bit assignments to the specific subbands based on the control signal from the band control part 4A with respect to the N pieces of subbands divided by the band dividing part 1 and assigns quatization bits to other subbands. A quantization part 3A quantizes other subband signals with assigned number of quantization bits.

50. 发明专利

JPH08251080A ECHO CENCELER 失效
公开(公告)号：JPH08251080A
公开(公告)日：1996-09-27
申请号：JP4841495
申请日：1995-03-08
申请人： MITSUBISHI ELECTRIC CORP
发明人： SUZUKI SHIGEAKI
IPC分类号： H03H21/00 , H04B3/23
摘要： PURPOSE: To obtain an echo canceler which never increase an echo by generating a dummy echo signal different from an actual echo signal even if the impulse response of an echo path abruptly varies. CONSTITUTION: A convolutional arithmetic part 9 performs convolutional operation between the contents of a received signal register 7 and the contents of an estimated impulse response register 8 and a subtracter 10 subtracts the arithmetic result from a transmission-side input signal. The output of the subtracter is inputted to a power calculation part 15 to calculate electric power. An estimated impulse response reset part resets the contents of the estimated impulse response register when the electric power is larger than the electric power calculated by a transmission-side input signal power calculation part 16 by more than a threshold value set by a threshold value setting part. Consequently, if the impulse response of the echo path abruptly varies, an estimated impulse response value as a factor of the generation of a dummy echo different from the actual echo signal is reset, so the echo canceler which never increases the echo is obtained.

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