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11. 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.

12. 发明专利

JPH04295940A SYSTEM FOR RECORDING OPERATION INFORMATION 失效
公开(公告)号：JPH04295940A
公开(公告)日：1992-10-20
申请号：JP8290091
申请日：1991-03-25
申请人： NEC CORP
发明人： WAKE YASUHIRO
IPC分类号： G06F9/46 , G06F11/34
摘要： PURPOSE:To eliminate redundant information gathering in a low load state and a deficiency of information in a high load state owing to the periodical gathering of the system operation information. CONSTITUTION:A system resource consumption monitoring means 2 which is actuated by an interval timer 1 compares current resource consumption obtained from a system resource consumption acquiring means 3 with resource consumption in a system resource consumption recording value storage area 4, and records the current resource consumption in a system resource consumption recording area 6 by using a system resource consumption recording means 5 and also stores the current resource consumption in the system resource consumption recording value storage area 4 at the same time only when their variation quantity is larger than a predetermined threshold value.

13. 发明专利

JPH01200296A SOUND ENCODER 失效
公开(公告)号：JPH01200296A
公开(公告)日：1989-08-11
申请号：JP2290288
申请日：1988-02-04
申请人： NEC CORP
发明人： WAKE YASUHIRO
IPC分类号： G10L19/04
摘要： PURPOSE:To faithfully reproduce the waveform of a high pitch frequency as well by investigating a mutual correlative function to be successively updated during a sound source pulse search and searching a driving sound source pulse until the function goes under a prescribed threshold. CONSTITUTION:A sound signal to be inputted from an input terminal 1 is inputted to a short time spectral information extracting part 2 and a mutual correlative function extracting part 3. The output result of the extracting part 2 is inputted to a self- correlative function extracting part 4 and the extracting part 3 and the outputs of the extracting parts 3 and 4 are inputted to a driving sound source pulse searching part 5. Each time the driving sound source pulse is extracted by an extracting means in the searching part 5, the searching part 5 obtains mutual correlative function power in a mutual correlative function power calculating part 6 and compares the value with the threshold to be determined in advance. Then, the driving sound source pulse is searched until the value goes under the threshold. Obtained the sound source number of pulses and sound source pulse are inputted to a sound source pulse quantizer 8 and encoded with a bit number to correspond to the driving sound source pulse number. Thus, even the waveform of the high pitch frequency can be faithfully reproduced.

14. 发明专利

JPS61184912A CONSTANT VARIABLE TYPE AUDIBLE SENSE WEIGHTING FILTER 失效
公开(公告)号：JPS61184912A
公开(公告)日：1986-08-18
申请号：JP2344985
申请日：1985-02-12
申请人： NEC CORP
发明人： WAKE YASUHIRO
IPC分类号： H03H21/00 , G10L11/00 , G10L13/00 , G10L19/04 , G10L19/08 , H03H17/00 , H03H17/02
摘要： PURPOSE:To improve the S/N in audible sense by connecting a means extracting spectrum information of an input voice and a constant decision means obtaining a forecast gain from said extracted information and outputting selectively one of plural constants by said gain to an audible weighted filter. CONSTITUTION:A forecast factor alphai being an output of a spectrum extracting device 1 is inputted to an audible sense weighted filter 2, and a Pacole parame ter ki is inputted to a weight constant gamma deciding device 3 for forecast gain calculation and a multiplexer 7 as line transmission. The device 3 obtains a forecast gain, uses said gain to output selectively one of gamma=0.7 and gamma=0.9 and the result is inputted to a constant multiplier of the filter 2. The filter 2 uses the alphai and gamma to apply weight to a voice signal (x) and an impulse response (h). The autocorrelation Rhh is obtained from the weighted impulse response hw by an autocorrelation calculating device 5, the mutual phase number phihx is obtained from the hw and the weighted voice signal xw by the device 4, input ted to a pulse retrieval device 6 together with the Rhh, a pulse is obtained and the pulse and the ki are multiplexed by the multiplexer 7.

15. 发明专利

JPH0997098A SOUNDLESS COMPRESSION SOUND ENCODING/DECODING DEVICE 失效
公开(公告)号：JPH0997098A
公开(公告)日：1997-04-08
申请号：JP25169195
申请日：1995-09-29
申请人： NEC CORP
发明人： WAKE YASUHIRO
IPC分类号： G10L19/04 , G10L11/00 , G10L19/00 , G10L19/06 , H03M1/06 , H04M7/00 , H04Q11/04 , G10L9/14 , G10L9/18
摘要： PROBLEM TO BE SOLVED: To improve transmission efficiency and compression efficiency and to realize a natural call. SOLUTION: An LPC analyzer 13 performs linear predictive analysis of a sound signal of a telephone band of a soundless section detected by a sound detector 12, and calculates an occurrence coefficient of a random noise. A selection circuit 16 selects and outputs any one among the analysis result of the LPC analyzer 13 and a digital sound signal delayed by a delay buffer 15 and 'no data' according to the detection result of the sound detector 12 and the detection result of the sound detector 12 delayed by a delay circuit 14. A synthesis filter 26 generates the random noise from a random number signal of a random number generator 25 based on a coefficient from a sound encoding part 1 inputted through a switch 22. A selection circuit 28 selects and outputs any one side between a regenerative sound signal from a sound decoder 24 and the random noise from the synthesis filter 26 according to the detection result of a sound/soundless data detector 21 delayed by the delay circuit 27.

16. 发明专利

JPH08146999A ATM SPEECH ENCODING DEVICE 失效
公开(公告)号：JPH08146999A
公开(公告)日：1996-06-07
申请号：JP28933594
申请日：1994-11-24
申请人： NEC CORP
发明人： WAKE YASUHIRO
IPC分类号： G10L19/08 , G10L19/00 , G10L19/04 , H03M7/30 , H04J3/16 , H04J3/24 , H04L12/56 , H04N1/00 , H04Q3/00 , H04Q11/04 , G10L9/18 , G10L9/14 , H04L12/28
摘要： PURPOSE: To eliminate the need to very the transmission rate of an existent CBR(Constant Bit Rate) network, to eliminate the need to repeat compounded encoding even at the time of a mutual connection with an ATM(Asynchronous Transfer Mode) transmission line, and to minimize the deterioration of speech quality and signal propagation delay by making only voiced parts of a speech signal cellular and transmitting them. CONSTITUTION: A CLAD part 3009 inputs the output signal S5 of a high- efficiency speech encoding part 200 to a transmission side and is equipped with a voiced/voiceless bit detection part 311, a FAX start data detection part 312, and a cell assembly part 313. The cell assembly part 313 assembles a cell and sends it out to the ATM transmission line through an output terminal 103 only when the voiced/voiceless bit detection part 311 detects a voiced part unless FAX start data S2 is detected from the S5. When the FAX data S2 is detected from the signal S5, on the other hand, the data of the subsequent signal S3 are all assembled into cells, which are outputted to the ATM transmission line through the output terminal 103 irrelevantly to the result of the voice/ voiceless bit detection part 311.

17. 发明专利

JPH04354248A VOICE CONNECTION SYSTEM 失效
公开(公告)号：JPH04354248A
公开(公告)日：1992-12-08
申请号：JP15563291
申请日：1991-05-30
申请人： NEC CORP
发明人： KAMIMURA TAKAYUKI , WAKE YASUHIRO
IPC分类号： H04M7/00
摘要： PURPOSE:To eliminate deterioration in sound quality in the relay state of a signal frog one station to other station in a line relay exchange in a digital one link voice connection system. CONSTITUTION:When a received PCM voice compression coding signal is addressed to other station, a line relay exchange 9 bypasses directly the reception signal as it is without any processing and sends it to other station. When the reception signal is a signal to its own station, the signal is sent to a high efficiency voice compressor 8, in which the signal is decoded into a PCM signal and the PCM signal is received by a PCM device 15 and sent to its own station telephone set 10 as an analog voice signal.

18. 发明专利

JPH03230233A FILE CONTROLLER 失效
公开(公告)号：JPH03230233A
公开(公告)日：1991-10-14
申请号：JP2646890
申请日：1990-02-05
申请人： NEC CORP
发明人： WAKE YASUHIRO
IPC分类号： G06F12/00
摘要： PURPOSE:To effectively utilize the storage area of a file by outputting an expansion control signal for the file when the file is stored in a compression type storage area, accessing a normal type storage area, and updating a control table. CONSTITUTION:When an area which is large enough for allocation can not be secured in the normal type storage area 2, a compression control signal for a corresponding file is supplied to a compressing means 5 in order from the file which is shortest in remaining presence period according to the contents of the control table 4 and files are compressed and stored in the compression type storage area 3 to secure the necessary area in the normal type storage area 2. An input/output means 1 when accessing a file investigates the contents of the control table 4 and accesses the area 2 when the file is stored in the compression type area 2, but when the file is stored in the compression type area 3, the expansion control signal for the file is supplied to an expanding means 6 to expand the file in the normal type area 2, which is accessed to update the contents of the control table 4. Consequently, the storage area of the files is utilized effectively and the load on a user is reduced.

19. 发明专利

JPH0279099A MULTI-PULSE VOICE PROCESSOR 失效
公开(公告)号：JPH0279099A
公开(公告)日：1990-03-19
申请号：JP23125088
申请日：1988-09-14
申请人： NEC CORP
发明人： WAKE YASUHIRO
IPC分类号： G10L19/04 , G10L19/08
摘要： PURPOSE:To improve synthetic sound quantity of high pitch frequency by comparing the largest value among absolute values of an cross correlation function which is updated in order while a driving sound source pulse is searched for with a predetermined threshold value and searching for the driving sound source pulse until the largest value becomes smaller than the threshold value. CONSTITUTION:A voice signal which is inputted from an input terminal 1 is inputted to a short-time spectrum information extraction part 2 and a cross correlation function part 3, the output result of the short-time spectrum information extraction part 2 is inputted to an autocorrelation function part 4 and the cross correlation function extraction part 3, and the output of the cross correlation function extraction part 3 and the output of the autocorrelation function extraction part 4 are inputted to a driving sound source pulse search part 5. Then a cross correlation function maximum absolute value calculation part 6 finds the maximum value among absolute values of the cross correlation which is updated successively while the driving sound source pulse is searched for and compares it with the predetermined threshold value, and a driving sound source pulse search part 5 searches for the driving sound source pulse until the maximum value becomes smaller than the threshold value. Consequently, the synthetic sound quality of high pitch frequency is improved.

20. 发明专利

JPS62165696A VOICE ENCODER 失效
公开(公告)号：JPS62165696A
公开(公告)日：1987-07-22
申请号：JP653686
申请日：1986-01-17
申请人： NEC CORP
发明人： WAKE YASUHIRO
IPC分类号： G10L19/04

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