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Nozomu Watanabe: Device operable with an excellent spectrum suppression. NEC Corporation, Sughrue Mion Zinn Macpeak & Seas, November 9, 1993: US05260973 (87 worldwide citation)

In a device for use in processing a baseband input signal and a carrier signal into an envelope output signal, a processing unit (3) is supplied with the baseband input signal and the carrier signal and produces, as a produced signal, a modulated signal and a non-modulated signal one at a time in re ...


2
Nozomu Watanabe, Yuji Yajima: Radio transceiver and a method of preventing transmission spurious response. NEC Corporation, Sughrue Mion PLLC, January 14, 2003: US06507728 (19 worldwide citation)

In a radio transceiver operating in a time division duplex system, a cancellation use transmission signal which is reverse in phase and equal in amplitude to a leakage transmission signal from an antenna in the signal transmission is supplied to an input port of the receiving amplifier of a receiver ...


3
Nozomu Watanabe: Radio transceiver having PLL synthesizer. NEC Corporation, Ostrolenk Faber Gerb & Soffen, June 7, 1994: US05319798 (17 worldwide citation)

A radio transceiver including a PLL synthesizer and is adaptable to a TDMA system in which the frequency of a radio frequency carrier is switched frequently at high speed. When an unlock alarm of the PLL synthesizer is used as one of the device alarms, the unlock alarm to be generated in an initial ...


4
Nozomu Watanabe: Radio loop-back test method and system which are reliable even in the presence of outside interference. NEC Corporation, Sughrue Mion Zinn Macpeak & Seas PLLC, November 30, 1999: US05995811 (13 worldwide citation)

In a radio loop-back test system for a radio apparatus in which a transmitter (15) transmits a first radio signal in response to a transmission signal and which a receiver (16) receives a second radio signal to produce a reception signal, a comparing portion (22) compares the reception signal with t ...


5
Nozomu Watanabe: Reception field detection apparatus. NEC Corporation, Foley & Lardner, August 27, 1996: US05551072 (3 worldwide citation)

A reception field detection apparatus includes a field intensity detection circuit, a correction value setting circuit, an adder, and a first converter. The field intensity detector generates a first digital signal representing a value corresponding to the signal intensity of a received signal. The ...


6
Nozomu Watanabe: Frequency synthesizer and frequency synthesizing method. NEC Corporation, Foley & Lardner, April 11, 1995: US05406591 (3 worldwide citation)

A frequency synthesizer and a frequency synthesizing method are disclosed. They are used to achieve frequency switching in a short time even though the switched width of an output frequency signal from the frequency synthesizer is narrow. A gate pulse generator circuit generates a gate pulse signal ...


7
Nozomu Watanabe, Atsushi Inahashi: Phase-locked loop having charge pump driven with preserved energy for instant channel switching. NEC Corporation, Sughrue Mion Zinn Macpeak & Seas, March 21, 1995: US05400372 (3 worldwide citation)

A frequency synthesizer comprises a voltage controlled oscillator, and a variable frequency divider for dividing the VCO frequency according to the frequency of a communication channel. The output of frequency divider is compared with a reference frequency and a phase difference of first polarity an ...


8
Nozomu Watanabe: Transceiver for preventing the degradation of reception sensitivity and modulation accuracy of a transmitted signal when an external reference signal incorporates noise. NEC Corporation, Sughrue Mion Zinn Macpeak & Seas, February 11, 1997: US05603099 (2 worldwide citation)

A transmitter/receiver has a superheterodyne receiver, a transmitter, a local oscillation signal generating section for transmission, a first and a second local oscillation signal generating section for reception, and a fixed frequency divider. A reference signal fed from the outside of the transmit ...


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Nozomu Watanabe: Radio lop-back test method having improved reliability and system using test method. NEC, WANG YONG, January 28, 1998: CN97112731

In a radio loop-back test system for a radio apparatus in which a transmitter (15) transmits a first radio signal in response to a transmission signal and which a receiver (16) receives a second radio signal to produce a reception signal, a comparing portion compares the reception signal with the tr ...