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    • 2. 发明专利
    • DIGITAL SIGNAL TRANSMITTER
    • JP2001251263A
    • 2001-09-14
    • JP2000059785
    • 2000-03-06
    • NIPPON TELEGRAPH & TELEPHONE
    • TANABE KAZUHIROKOBAYASHI SEIKAZAMA HIROSHI
    • H03M9/00H04J1/04H04J3/00
    • PROBLEM TO BE SOLVED: To provide a digital signal transmitter which is used for radio communication, etc., for transmitting the multi-carrier multi-rate and the signal transmission rate which can be changed easily. SOLUTION: A digital signal transmitter consists of a channel multiplexing means, a serial-parallel conversion means which performs serial-parallel conversion of input signals into plural slow signals, a frame configuration means which turns every parallel signal into a frame, a parallel-serial conversion means which can vary the number of outputs and plural modulation means which modulates plural pieces of signals. Meanwhile, a digital signal receiver consists of a channel demultiplexing means, a demodulation means which demodulates plural pieces of input signals, a serial-parallel conversion means which can vary number of inputs and outputs, a unique word detection means, which detects unique word for each slow signal outputted from the serial-parallel conversion means and a parallel-serial conversion means, which can very the number of inputs for performing the parallel-serial conversion of plural pieces of slow signals, after their new words are detected.
    • 3. 发明专利
    • COMMUNICATION DEVICE
    • JP2000004194A
    • 2000-01-07
    • JP17004998
    • 1998-06-17
    • NIPPON TELEGRAPH & TELEPHONE
    • KOBAYASHI SEI
    • H04B1/76H04B7/15
    • PROBLEM TO BE SOLVED: To obtain high frequency correction accuracy by allowing a slave station to detect an error between the receiving frequency of a pilot signal from a master station which is received via a repeater and the frequency of a local oscillator for receiving, to multiply it by a constant and to add the result to a transmission frequency and allowing the master station to detect the error between the receiving frequency and the frequency of the local oscillator and to correct and receive a receiving frequency. SOLUTION: A master station 1 makes a transmission local oscillator 101 transmit in a frequency F11 and transmits it as a pilot signal A toward a repeater 2. The repeater 2 performs frequency conversion of the signal A through a local oscillator 201 and a frequency converter 202 and retransmits it to a slave station 3 and the station 1. Next, the station 3 receives a pilot signal B, calculates deviation by comparing the receiving frequency of the signal B with a local transmission frequency of a receiving local oscillator 302 through a frequency comparator 301 and makes a correction frequency oscillator 304 oscillate a frequency that undergoes multiplication of the deviation by F1/F2 through a multiplier 307.
    • 5. 发明专利
    • POST-DETECTION DIVERSITY RECEIVING CIRCUIT
    • JPH10256967A
    • 1998-09-25
    • JP5955197
    • 1997-03-13
    • NIPPON TELEGRAPH & TELEPHONE
    • KUMAGAI TOMOAKIKOBAYASHI SEI
    • H04B7/08
    • PROBLEM TO BE SOLVED: To reduce the circuit scale of a weighting factor calculating means by previously calculating the ratio A of S/N of each branch, inputting this ratio A to a weighting factor calculating means, and calculating the weighting factor of each branch by a specific arithmetic operation. SOLUTION: A dividing circuit 11 calculates the ratio A(t) of the output SNR'1 (t) of an S/N detecting circuit 6-1 to the output SNR'2 (t) of an S/N detecting circuit 6-2, and gives it to a weighting factor calculating circuit 12. The calculating circuit 12 calculates w1 A(t)=1/1(1+A(t)) and w2 A(t)=A(t)/(1+A(t)) based on output A(t) from the dividing circuit 11, and outputs weighting factors w1 A(t) and w2 A(t). Then, a multiplying circuit 3-1 multiplies a demodulates signal 1 by the weighting factor w1 A(t) for weighting, and a multiplying circuit 3-2 multiplies a corrected result signal 4 by the weighting factor w2 A(t)for weighting. Thus, the weighting factor calculating circuit 12 inputs only the output of the dividing circuit 11 differing from the conventional circuit so that the number of input bits is decreased.
    • 8. 发明专利
    • CLOCK REGENERATION CIRCUIT
    • JPH08331190A
    • 1996-12-13
    • JP13446895
    • 1995-05-31
    • NIPPON TELEGRAPH & TELEPHONE
    • KOBAYASHI SEIKUBOTA SHUJIKATO SHUZO
    • H04L27/22H04L7/027
    • PURPOSE: To provide a clock regeneration circuit having a highly accurate clock phase estimate characteristic even in a frequency selective fading line. CONSTITUTION: A modulation signal phase detection circuit 10 detects a modulation signal phase of a modulation signal A. Then a 1-symbol differential circuit 20 obtains a one-difference signal Ci. Then a multiplier circuit 50 multiplies a cosine value fed from a cosine waveform generating circuit 40 with the one- difference signal Ci, and an integration circuit 60 integrates the result of multiplication by the multiplier circuit, 50, the product is divided by a value M and the quotient is outputted as a signal E. A multiplier circuit 51, a sine waveform generating circuit 41 and an integration circuit 61 conduct the similar processing and provide an output of a signal F. A ROM 70 provides an output of a clock phase θ stored in addresses E, F. Finally a clock generating circuit 80 outputs a clock signal with the same phase as a signal J outputted from the ROM 70 among clock signals obtained by frequency-dividing an output signal of a reference signal generator 110.
    • 10. 发明专利
    • DIVERSITY COMMUNICATION EQUIPMENT
    • JPH07245577A
    • 1995-09-19
    • JP3504294
    • 1994-03-04
    • NIPPON TELEGRAPH & TELEPHONE
    • KOBAYASHI SEIKATO SHUZO
    • H04B7/06H04B7/08H04B7/26
    • PURPOSE:To obtain low power consumption and high line quality by the use of a simple equipment by providing plural antennas and selecting 'any of the antennas to send a transmission signal when the detected reception quality is lower than a threshold quality. CONSTITUTION:A comparator 308 in a mobile station 300 having antennas 301, 302 compares a signal strength detected by a reception signal strength detector 307, that is, a detection result of a reception signal with a threshold level received externally in advance. When the signal strength is smaller than the threshold level, the comparator 308 switches the setting of a switch 309 so as to select the opposite antenna to be connected. Thus, the reception signal received by a receiver 303 is demodulated by a demodulator 305 and outputted. When an externally inputted signal is modulated by a modulator 306 in the transmission of an incoming signal from the mobile station 300 and the modulated signal becomes a transmission signal by a transmitter 304 and sent through either of the antennas 301, 302 selected by the switch 309 after via the switch 310.