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1. 发明专利

JPH0637733A VOICE DETECTOR 失效
公开(公告)号：JPH0637733A
公开(公告)日：1994-02-10
申请号：JP18772292
申请日：1992-07-15
申请人： NEC CORP , MIYAGI NIPPON DENKI KK
发明人： SHINODA MINORU , NUMATA YOSHIAKI
IPC分类号： H04J3/17
摘要： PURPOSE:To prevent the deterioration in a compression rate of a DSI equipment by discriminating an inputted PCM signal to be in a non-voice block when a fault signal is received. CONSTITUTION:This detector is provided with a voice detection section consisting of a band pass filter 1 detecting whether an inputted PCM signal 101 corresponds to a voiced block or a non-voice block, of a zero cross calculation section 2 and a power calculation section 4, with a comparator section 8 comparing the PCM signal 101 with a fault pattern and outputting a coincidence/dissidence signal, with a fault pattern storage section 9 generating the fault pattern, with a counter section 6 generating a signal representing a fault block or a usual block based on an output signal from the comparator section 8, with a delay section 5 delaying a detection signal of the voice detection section by the number of a sampling period required to detect the fault block, and with a discrimination section 7 receiving an output signal of the delay section 5 and an output signal of the counter section, and outputting the output of the delay section 5 as it is when the output of the counter section 6 indicates the usual block and outputting the signal of the non-vice block as an output signal 102 when the output of the counter section 6 indicates the fault block.

2. 发明专利

JP2001077752A DEVICE AND METHOD FOR LIGHT WAVELENGTH MULTIPLEXING 失效
公开(公告)号：JP2001077752A
公开(公告)日：2001-03-23
申请号：JP25372699
申请日：1999-09-08
申请人： NEC CORP , MIYAGI NIPPON DENKI KK
发明人： SHINODA MINORU , SHIRAGAKI TATSUYA , WATANABE TAKESHI
IPC分类号： H04B10/556 , H04B10/07 , H04B10/2507 , H04B10/299 , H04J3/00 , H04J3/06 , H04L7/02 , H04B10/00
摘要： PROBLEM TO BE SOLVED: To provide a light wavelength multiplexing device wherein IP router being a client and a light wavelength multiplexing device are subjected to a high-accuracy synchronizing source by wavelengths through a function for making them subordinate to a timing source for from outside. SOLUTION: An optoelectric converter 21-1 of each of transmitters 2-1 to 2-3 terminates from a light input signal from an IP router, etc., and a timing extractor 22-1 extracts a timing signal from a receive signal. A selector 23-1 selects and outputs one of the extracted timing signal and a timing signal from an external timing input terminal 5. A timing synchronizer 24-1 synchronizes the terminated transmit signal with the timing of the selector 23-1 and an electrooptic converter 24-1 converts the transmit signal to a light wavelength signal which is different by transmitters. A light wavelength multiplexer 3 multiples and transmits the light signals from the transmitters 2-1 to 2-3 to an optical transmission line 100.

3. 发明专利

JPH0865478A FACSIMILE SIGNAL TRANSMISSION SYSTEM 失效
公开(公告)号：JPH0865478A
公开(公告)日：1996-03-08
申请号：JP20186694
申请日：1994-08-26
申请人： MIYAGI NIPPON DENKI KK , NEC CORP
发明人： NUMATA YOSHIAKI , SHINODA MINORU
IPC分类号： H04N1/32 , H04J3/16 , H04N1/327
摘要： PURPOSE: To keep the lower limit of a switching time from a low speed signal to a high speed signal even when the change in the number of facsimile lines is high. CONSTITUTION: A facsimile input signal is given to a demodulation section 11 and an identification section 12. The demodulation section 11 demodulates the facsimile input signal and the demodulated signal is fed to a multiplexer section 17. The identification section 12 identifies the facsimile input signal (low speed signal/high speed signal) and a control signal generating section 13 generates an FCC message based on the identification result of the identification section 12 and the result is fed to a delay addition section 14. The delay addition section 14 varies the transmission delay time of the FCC message generated by the control signal generating section 13 with a signal from the delay control section 16 and a queue transmission section 15 sends the FCC message delayed by the delay addition section 14 for each priority and gives the result to a multiplexer section 17. The queue transmission section 15 sends a control signal to keep a specified switching time from a low speed to a high speed to the delay control section 16.

4. 发明专利

JPH0492540A SINGLE TONE DETECTOR 失效
公开(公告)号：JPH0492540A
公开(公告)日：1992-03-25
申请号：JP20985590
申请日：1990-08-08
申请人： NEC CORP , MIYAGI NIPPON DENKI KK
发明人： SHINODA MINORU , NUMATA YOSHIAKI
IPC分类号： H04L27/00 , H04Q1/448
摘要： PURPOSE:To decrease the number of BPFs by detecting a single tone with use of an adaptive FIR filter a maximum coefficient deviation calculation circuit, and a decider. CONSTITUTION:An estimating part 2 is provided to estimate an input digital signal based on a past input digital signal train together with a sound detection circuit 3 which detects the voice and silent parts of the input digital signal, a maximum coefficient deviation calculation circuit 4 which calculates the maximum deviation of the coefficient of the part 2 within an identified section set when the circuit 3 detected a voice part out of a silent part, and a decider 6 which compares the maximum coefficient deviation with the prescribed threshold value to decide the deviation. In such a constitution, the number of both BPFs and deciders in number equal to the single tones can be omitted despite the increase of the number of single tones.

5. 发明专利

JP2000332805A OPTICAL WAVE RING SYSTEM 失效
公开(公告)号：JP2000332805A
公开(公告)日：2000-11-30
申请号：JP14385999
申请日：1999-05-24
申请人： NEC CORP , MIYAGI NIPPON DENKI KK
发明人： YOSHIFUJI HIROTERU , IIDA SHUICHI , YAMAZAKI TAKASHI , NAKABAYASHI YOKO , NAKAMURA SHINYA , OZAWA KIMIO , ANDO NAOKI , KIKUCHI HITOSHI , HAGA TSUKASA , WATANABE HIROMITSU , SHINODA MINORU , TAKESHITA HITOSHI , SASAKI SHINOBU , YAMADA AKIRA , HENMI NAOYA
IPC分类号： H04B10/03 , H04B10/032 , H04B10/07 , H04B10/27 , H04B10/275 , H04B10/291 , H04J14/00 , H04J14/02 , H04L12/42 , H04L12/437 , H04Q3/52 , H04Q11/04 , H04B10/02 , H04B10/20
摘要： PROBLEM TO BE SOLVED: To obtain an optical wave ring system that can apply a protection function only to a faulty wavelength even on the occurrence of the fault of the part wavelength in a point-to-point wavelength multiplex transmission system. SOLUTION: Each of 1st-4th nodes 101-104 is provided with wavelength multiplex/demultiplex sections 132, 133. An optical wave ring device 131i with respect to a wavelength λi is installed to 1st-3rd nodes 101-103, and an optical wave ring device 131j with respect to a wavelength λj is installed to 2nd-4th nodes 102-104. Clients 135 are connected to the optical wave ring devices 131i and 131j. Thus, the system takes a unique ring configuration as to each wavelength (two wavelengths only are explained above). Each of the optical wave ring devices 131i and 131j is provided with a wavelength conversion section and an overhead termination section, and when the overhead termination section detects a fault as to a transmission path of a wavelength being a prescribed block, the overhead termination section recovers the fault of each corresponding wavelength. The wavelength conversion section can optionally change the wavelength given to or outputted from the fiber.

6. 发明专利

JPH0653927A DSI DEVICE 失效
公开(公告)号：JPH0653927A
公开(公告)日：1994-02-25
申请号：JP20463292
申请日：1992-07-31
申请人： NEC CORP , MIYAGI NIPPON DENKI KK
发明人： SHINODA MINORU , NUMATA YOSHIAKI
IPC分类号： H04J3/17
摘要： PURPOSE:To simplify the circuit for a background noise inserting part at the time of a non-speech, and to make the inserted background noise to the actual background noise by preparing and inserting the background noise by employing the signal of the hangover part of a sound part. CONSTITUTION:A transmission example is constituted of a hangover control circuit 12 which outputs a hangover identification signal to identify the hangover part of the sound part, and a multiplex circuit 16 which multiplexes the hangover identification signal with a voice signal or the like, and transmits it to a transmission path. A reception example is constituted of a hangover identifying circuit 25 which decodes the hangover identification signal, extracts the signal of the hangover part of the corresponding sound part, and holds it, and a background noise holding circuit 26 and a background noise inserting circuit 27 which inserts the signal of the held hangover part into the silent part of a corresponding voice digital signal.

7. 发明专利

JPH0555834A NOISE SIGNAL GENERATOR 失效
公开(公告)号：JPH0555834A
公开(公告)日：1993-03-05
申请号：JP21545091
申请日：1991-08-27
申请人： NEC CORP , MIYAGI NIPPON DENKI KK
发明人： SHINODA MINORU , SONODA YUKIO
IPC分类号： H03B29/00
摘要： PURPOSE:To improve the sound quality of noise by extending the repeating period of noise signals. CONSTITUTION:A noise sample value storing circuit L stores plural noise signal sample values and outputs contents stored in a specified address. A sample period generating circuit 2 generates a signal in each noise signal sampling period. A reading address generating circuit 3 generates a noise having a period longer than its capacity within the reading address range of the circuit 1 in each sampling period generated from the circuit 2.

8. 发明专利

JPH04267608A WHITE NOISE GENERATOR 失效
公开(公告)号：JPH04267608A
公开(公告)日：1992-09-24
申请号：JP4745091
申请日：1991-02-21
申请人： NEC CORP , MIYAGI NIPPON DENKI KK
发明人： NUMATA YOSHIAKI , SHINODA MINORU
IPC分类号： H03B29/00 , G01R31/3183 , G06F7/58 , H03K3/84
摘要： PURPOSE:To simplify a peripheral circuit and to facilitate fine adjustment of noise signal power by generating white noise with a timing circuit, a reference power white noise signal generator and a multiplier. CONSTITUTION:A timing circuit 1 receiving a signal (a) extracts an output sampling value (d) of a white noise signal generator 2 and receives a signal (b) to extract a multiplication coefficient in response to the power of the white noise signal. A coefficient selection circuit 3 outputs a desired multiplication coefficient and a hold selection signal synchronously with the signal (b) based on the power designated from input terminals 7-1...7-n and a power adjustment coefficient (g) designated by an input terminal 6. A multiplier 4 multiplies the signals c, d to execute easily fine adjustment of the designated power. A calculated white noise sample (e) is given to a holding circuit 5 according to a hold selection signal (f) to output white noise signals h,i...j from terminals 8-1...8-n.

9. 发明专利

JPH0415525A SINGLE TONE DETECTOR 失效
公开(公告)号：JPH0415525A
公开(公告)日：1992-01-20
申请号：JP11937090
申请日：1990-05-09
申请人： NEC CORP , MIYAGI NIPPON DENKI KK
发明人： SHINODA MINORU , NAGAO YOSHIHIRO , NUMATA YOSHIAKI
IPC分类号： G01H17/00
摘要： PURPOSE:To improve the decision rate for deciding a single tone or not even in the case an input signal-to-noise ratio is small by comparing a coefficient of a filter and a threshold by a deciding device and detecting whether an input digital signal is a single tone or not. CONSTITUTION:A sound part and a no-sound part of an inputted digital signal are detected by a signal-to-noise ratio calculating circuit 3, and a ratio of signal power of the sound part and the no-sound part is calculated. An initial value corresponding to an output of the circuit 3 is selected by an initial value selecting circuit 4, and inputted to a secondary adaptive FIR filter 2. The filter 2 predicts the inputted digital signal by a digital signal train inputted in the past, and also, sets an output of the circuit 4 as an initial value of a coefficient of the filter only when the circuit 3 outputs a fact to be the sound part from the no-sound part. A threshold selecting circuit 5 selects a threshold corresponding to a signal-to-noise ratio being an output of the circuit 3, and by a deciding device 6, a coefficient of the filter and a variable threshold being an output of the circuit 5 are compared, and a single tone or not is decided.

10. 发明专利

JPH03253149A TONE DETECTOR 失效
公开(公告)号：JPH03253149A
公开(公告)日：1991-11-12
申请号：JP5094190
申请日：1990-03-02
申请人： NEC CORP , MIYAGI NIPPON DENKI KK
发明人： SHINODA MINORU , NUMATA YOSHIAKI
IPC分类号： H04L27/00 , H04Q1/46
摘要： PURPOSE:To reduce the quantity of processing to be executed with a general purpose processor or the like and to attain real time processing by constituting this tone detector with a tone detecting circuit for detecting whether an input digital signal is a specific tone or not and a single tone detecting circuit for detecting whether the input digital signal is an optional single tone or not. CONSTITUTION:In the single tone detector for detecting whether an input digital signal is a specific tone or an optional single tone, the specific tone is detected by the tone detecting circuit 2 and a specific tone detecting signal is outputted from an output terminal 4. The optional single tone is detected by the single tone detecting circuit 3 and an optional single tone detecting signal is outputted from an output terminal 5. Consequently, the number of band pass filters can be remarkably reduced, the quantity of processing to be executed by a general processor can be reduced an the real time processing can be attained.

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