公开(公告)号：JP2003283467A

公开(公告)日：2003-10-03

申请号：JP2002086223

申请日：2002-03-26

Applicant: Advantest Corp ,  株式会社アドバンテスト

Inventor： UEKI YUTAKA ,  KANAI SUSUMU ,  HANAI HIDEYUKI ,  KURITA HIROYUKI

IPC: H04L1/00 ,  H04B17/00 ,  H04L29/14

Abstract: PROBLEM TO BE SOLVED: To measure a communication state so as to easily discriminate a channel in which an error takes place or the like. SOLUTION: A channel discrimination section 18 discriminates a channel used for a signal and an error discrimination section 20 discriminates whether or not an error takes place in the signal. An error log recording section 24 records the results of discrimination above. Then an error occurrence frequency measurement section 26 can measure the frequency of occurrence of errors in each channel on the basis of recording contents of the error log recording section 24. COPYRIGHT: (C)2004,JPO

Abstract translation: 要解决的问题：为了测量通信状态以便容易地区分发生错误的频道等。 解决方案：信道鉴别部分18鉴别用于信号的信道，并且误差鉴别部分20鉴别信号中是否发生错误。 错误日志记录部24记录上述的辨别结果。 然后，错误发生频率测量部分26可以基于错误日志记录部分24的记录内容来测量每个通道中出现的错误的频率。（C）2004，JPO

公开(公告)号：JP2003283381A

公开(公告)日：2003-10-03

申请号：JP2002089160

申请日：2002-03-27

Applicant: Advantest Corp ,  株式会社アドバンテスト

Inventor： KURITA HIROYUKI ,  KANAI SUSUMU ,  UEKI YUTAKA ,  HANAI HIDEYUKI

IPC: H04B1/713 ,  H04B1/7156

Abstract: PROBLEM TO BE SOLVED: To facilitate synchronization of communication equipment using a frequency hopping system with an apparatus for measuring the communication equipment.
SOLUTION: An applying frequency signal having an applying frequency which is used by the frequency hopping system is high, and communication of a packet 42 has been started. A trigger is generated when 0 bit (top of a pay load 42b) being the n-th bit from the start time point is communicated, and measurement is started, thereby facilitating the synchronization of the communication equipment with a measuring apparatus.
COPYRIGHT: (C)2004,JPO

Abstract translation: 要解决的问题：为了促进使用跳频系统的通信设备与用于测量通信设备的设备的同步。 解决方案：具有由跳频系统使用的施加频率的施加频率信号高，并且分组42的通信已经开始。 当从起始时间点起第0位的0比特（付费负载42b的顶部）被通信时，产生触发，并且开始测量，从而便于通信设备与测量装置的同步。 版权所有（C）2004，JPO

公开(公告)号：JP2003273814A

公开(公告)日：2003-09-26

申请号：JP2002070574

申请日：2002-03-14

Applicant: Advantest Corp ,  株式会社アドバンテスト

Inventor： UEKI YUTAKA ,  KANAI SUSUMU ,  HANAI HIDEYUKI ,  KURITA HIROYUKI

IPC: H04B17/00

Abstract: PROBLEM TO BE SOLVED: To easily correct the error when a measurement device is connected to Bluetooth communication device. SOLUTION: A loss for coupling a terminal (1) with terminals (2) to (8) is recorded in a coupling loss recording part 40. A signal level rise part 60 reads out the loss from the recording part 40 and raises the signal level of a communication signal generating device 30 by the loss so as to correct the loss for coupling. Consequently, since there is no need for measuring the loss for coupling, each time test is performed, the loss for coupling easily corrected. COPYRIGHT: (C)2003,JPO

Abstract translation: 要解决的问题：当测量设备连接到蓝牙通信设备时，容易纠正错误。 解决方案：将端子（1）与端子（2）至（8）耦合的损耗记录在耦合损耗记录部件40中。信号电平上升部件60从记录部件40读出损耗并升高 通信信号发生装置30的信号电平通过损耗来校正耦合损耗。 因此，由于不需要测量耦合损耗，因此每次进行测试时，耦合损耗容易校正。 版权所有（C）2003，JPO

公开(公告)号：JPH09145755A

公开(公告)日：1997-06-06

申请号：JP30538995

申请日：1995-11-24

Applicant: ADVANTEST CORP

Inventor： UEKI YUTAKA

IPC: G01R23/165

Abstract: PROBLEM TO BE SOLVED: To automatically adjust the center frequency of a signal to be measured at the time of measuring the harmonic component of the signal by impressing a voltage signal which makes the center frequency of the signal equal to the phase of a reference signal upon a Gaussian filter 4. SOLUTION: A Gaussian filter 4 generates a center frequency based on a reference signal inputted from an oscillator 2 through a buffer 3 and, when a signal to be measured is inputted from an input terminal 1 through a switch 5a, the filter, 4 mixes the center frequency with the harmonic component of the signal to be measured and outputs the mixed signal to a comparator 6. The comparator 6 compares the mixed signal with a reference signal inputted through a buffer 3b , fetches the shifting amount of the phase as a voltage value, and inputs the voltage value to a CPU 11 through an amplifier 9 and an A/D converter 10. The CPU 11 outputs a voltage signal which makes the phase of the center frequency generated by the filter 4 equal to that of the reference signal to the filter 4. Therefore, the phase of the center frequency can be adjusted automatically even when a different signal to be measured is inputted.

公开(公告)号：JPH07321582A

公开(公告)日：1995-12-08

申请号：JP13808694

申请日：1994-05-27

Applicant: ADVANTEST CORP

Inventor： UEKI YUTAKA

IPC: G01R23/16 ,  H03G11/08

Abstract: PURPOSE:To improve noise figure characteristics and to widen the dynamic range of a logarithmic amplifier circuit by making the gain of the limiting amplifier of an initial stage large. CONSTITUTION:A logarithmic transformation circuit receives input signals Vinput and signals logarithmically transformed by a limiting amplifier part 20 constituted of the serially connected plural stages of the limiting amplifiers 21-26 are detected in a detection part 74, quantized in an AD converter 76 and converted to digital signals Dad. Thereafter, a correction operation is performed by a correction value from a logarithmic correction table 79 in a logarithmic scale correction part 78 and logarithmically transformed signals are outputted. Then, the limiting amplifier 21 for which the gain setting of the initial stage of the limiting amplifier part 20 is turned to be more than 16dB and less than 30dB is provided. By making the gain of the limiting amplifier 21 of the initial stage large, the improvement effect of approximately 4-8dB for the noise figure characteristics is obtained. Thus, the dynamic range of this logarithmic amplifier circuit is improved.

公开(公告)号：JPH0727797A

公开(公告)日：1995-01-31

申请号：JP19308793

申请日：1993-07-08

Applicant: ADVANTEST CORP

Inventor： MORI EIJI ,  UEKI YUTAKA

IPC: G01R23/173 ,  G01R35/00

Abstract: PURPOSE:To easily perform a correction operation, to eliminate a tracking error clue to a change in ambient temperature and to perform a stable measurement by a method wherein an oscillator is swept, a calibrating operation is performed and the center frequency of an IF filter is found by a control part. CONSTITUTION:The automatic correction circuit is constituted of a synthesizer 13, a variable oscillator 21, mixers 12, 15, 20, a fixed oscillator 17, a switch 14, an attenuator 16, a BPF 16 and a control part 23. Then, in a calibrating operation to find a center frequency, the switch 14 is changed over to the side of a tracking generator (TG) in advance, the oscillator 21 is swept, and the level of an output 34 at every sweep frequency is read out. As a result, the frequency of a maximum output level point is found. The frequency is found as an IF center frequency at a present ambient temperature and in a present apparatus state. The center frequency which has been found is set in the oscillator 21, the switch 14 is returned to the side of a measurement, and the calibrating operation is completed.

公开(公告)号：JPH05312858A

公开(公告)日：1993-11-26

申请号：JP11739492

申请日：1992-05-11

Applicant: ADVANTEST CORP

Inventor： UEKI YUTAKA ,  SATOU MITSUNORI

IPC: G01R23/16 ,  G01R23/173

Abstract: PURPOSE:To provide a function to carry out mean square measurement of waveform within a short time to a spectrum analyzer. CONSTITUTION:In a zero span mode of a spectrum analyzer, an amplitude sample from an A/D transducer 19 is selected by a switching circuit 25, given to an additional averaging part 26 to obtain an additional mean value A1 of amplitude samples per every 600 samples and these processes are repeated. Together with already obtained additional mean, each of the additional mean value A1 is square-avaraged by an square averaging part 27 and each square mean value Ri is saved in turns in an image memory 21.

公开(公告)号：JPH05203686A

公开(公告)日：1993-08-10

申请号：JP1246892

申请日：1992-01-28

Applicant: ADVANTEST CORP

Inventor： KATO KAZUO ,  UEKI YUTAKA

IPC: G01R23/173

Abstract: PURPOSE:To increase the ease with which a spectrum analyzer is used by automating adjustment of a variable attenuator at the input end of RF signals so that a mixer is not saturated. CONSTITUTION:A variable attenuator control circuit 19 is provided to detect the input signal level of a mixer 3 and control a variable attenuator 2 so that the level is almost at the maximum allowable input level. The circuit 19 performs envelope detection of part of the outputs of the variable attenuator 2 using a detector 21 and this detected wave output is input to a comparator 23 where it is compared with reference voltage Er and the variable attenuator 2 is controlled by the output of the comparator 23. A control circuit 12 detects a maximum peak value from data for one screen which are loaded on image memory 11, and can control the gain of a step amplifier 7 so that the peak value is at the maximum of the screen display level range.