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1. 发明授权

US5513387A Automatic gain control circuit 失效
标题翻译：自动增益控制电路
公开(公告)号：US5513387A
公开(公告)日：1996-04-30
申请号：US76847
申请日：1993-06-15
申请人： Yutaka Saito , Yasumi Imagawa
发明人： Yutaka Saito , Yasumi Imagawa
IPC分类号： H03G3/20 , H03G3/30 , H04B1/16
CPC分类号： H03G3/3052
摘要： In a receiver for effecting an intermittent reception operation, a reception unit including an antenna, a radio frequency amplifier, a local oscillator and a mixer, a received signal processing circuit for starting signal processing of a received signal from the reception unit after the passage of a predetermined time, a reception field level detection unit for detecting the level of the received signal and an automatic gain control unit for controlling the level of the received signal within the predetermined time and holding the controlled level after the passage of the predetermined time, are disposed in a plurality of stages.
摘要翻译：在用于进行间歇接收操作的接收机中，包括天线，射频放大器，本地振荡器和混频器的接收单元，用于在通过之后从接收单元开始对接收信号进行信号处理的接收信号处理电路预定时间，用于检测接收信号的电平的接收电平检测单元和用于在预定时间内控制接收信号的电平并且在经过预定时间后保持受控电平的自动增益控制单元是设置在多个阶段。

2. 发明申请

US20090191831A1 DIVERSITY RECEIVING DEVICE AND RECEIVING SCHEME SWITCHING METHOD 失效
标题翻译：多样性接收设备和接收方案切换方法
公开(公告)号：US20090191831A1
公开(公告)日：2009-07-30
申请号：US12295200
申请日：2006-04-04
申请人： Makoto Sasaki , Yasumi Imagawa , Satoshi Kaga , Kazuhiko Nakayama , Keiko Izumi
发明人： Makoto Sasaki , Yasumi Imagawa , Satoshi Kaga , Kazuhiko Nakayama , Keiko Izumi
IPC分类号： H04B1/06
CPC分类号： H04B7/0814 , H04B7/0871 , Y02D70/444
摘要： It is a theme of the present invention to provide a diversity receiving device and a receiving scheme switching method, capable of attaining a power saving by executing a switching between a diversity reception and a single reception with high accuracy. A receiving scheme switching portion (112) switches a receiving mode between a single reception and a diversity reception based on a receiving scheme switching threshold, updates the receiving scheme switching threshold based on the receiving rate calculated by a receiving rate calculating portion (110), switches the receiving mode into the single reception in which respective ones of antennas (101, 105), radio demodulating portions (102, 106), and decoding portions (103, 107) are employed respectively and also turns OFF respective power supplies of the remaining antenna (101 or 105), the remaining radio demodulating portion (102 or 106), and the remaining decoding portion (103 or 107) when the received quality calculated by the received quality calculating portion (111) exceeds the receiving scheme switching threshold, and switches the receiving mode into the diversity reception in which the antennas, the radio demodulating portions, and the decoding portions are employed in both branches when the received quality is below the receiving scheme switching threshold.
摘要翻译：本发明的主题是提供一种分集接收装置和接收方式切换方法，其能够通过以高精度执行分集接收和单个接收之间的切换来实现省电。接收方式切换部分（112）基于接收方式切换阈值在单个接收和分集接收之间切换接收模式，基于由接收速率计算部分（110）计算的接收速率更新接收方案切换阈值，将接收模式切换到分别采用各自的天线（101,105），无线电解调部分（102,106）和解码部分（103,107）的单个接收，并且还关闭其余的各个电源当由接收质量计算部分（111）计算的接收质量超过接收方案切换阈值时，天线（101或105），剩余无线电解调部分（102或106）和剩余解码部分（103或107）将接收模式切换成在两个麸皮中采用天线，无线电解调部分和解码部分的分集接收当接收质量低于接收方案切换阈值时。

3. 发明授权

US5894499A Direct conversion receiver having filter with cut-off frequency switching means 失效
标题翻译：具有截止频率切换装置的滤波器的直接转换接收机
公开(公告)号：US5894499A
公开(公告)日：1999-04-13
申请号：US796911
申请日：1997-02-06
申请人： Hiroshi Katayama , Yasumi Imagawa , Masahiro Mimura
发明人： Hiroshi Katayama , Yasumi Imagawa , Masahiro Mimura
IPC分类号： H04L27/148 , H04B1/16 , H04B7/26 , H04L27/00 , H04L27/14 , H04L27/227 , H04Q7/14
CPC分类号： H04L27/2273 , H04L2027/0057
摘要： A direct conversion receiver has: an I-low-pass filter 9 which has cut-off frequency switching device, switches over the cut-off frequency in accordance with the transmission rate, and eliminates high-frequency components from a modulated signal mixed with a first local signal; a Q-low-pass filter 10 which eliminates high-frequency components from a modulated signal mixed with the first local signal phase-shifted by 90 degrees; transmission rate detecting device 13 for detecting transmission rate information from transmission data detected by transmission data detecting device 12; and I- and Q-low-pass filter cut-off frequency controlling device 15 and 16 for generating I- and Q-control signals which control the cut-off frequency switching device, from the detected transmission rate. The cut-off frequencies of the low-pass filters are switched over in accordance with the transmission rate of reception.
摘要翻译：直接转换接收机具有：具有截止频率切换装置的I低通滤波器9，根据传输速率切换截止频率，并且从混合有调制信号的调制信号中消除高频分量第一个本地信号; Q-低通滤波器10，其从与第一本地信号相移90度混合的调制信号中消除高频分量; 传输速率检测装置13，用于从由传输数据检测装置12检测的传输数据检测传输速率信息; 以及用于从检测到的传输速率产生控制截止频率切换装置的I和Q控制信号的I和Q-低通滤波器截止频率控制装置15和16。根据接收的传输速率切换低通滤波器的截止频率。

4. 发明授权

US06693977B2 Portable radio device with direct conversion receiver including mixer down-converting incoming signal, and demodulator operating on downconverted signal 失效
标题翻译：具有直接转换接收器的便携式无线电设备，包括下变频输入信号的混频器，以及在下变频信号上操作的解调器
公开(公告)号：US06693977B2
公开(公告)日：2004-02-17
申请号：US09855613
申请日：2001-05-16
申请人： Hiroshi Katayama , Katsuaki Abe , Yasumi Imagawa
发明人： Hiroshi Katayama , Katsuaki Abe , Yasumi Imagawa
IPC分类号： H03D300
CPC分类号： H03D3/245 , H03D3/007
摘要： A direct conversion receiver includes a local oscillator for generating a first local oscillator signal having a variable frequency. A 90° phase shifter operates for shifting a phase of the first local oscillator signal by 90° to convert the first local oscillator signal into a second local oscillator signal. A first mixer operates for mixing a received RF signal and the first local oscillator signal. A second mixer operates for mixing the received RF signal and the second local oscillator signal. A first low pass filter processes an output signal of the first mixer. The first low pass filter has a controllable cutoff frequency. A second low pass filter processes an output signal of the second mixer. The second low pass filter has a controllable cutoff frequency. A demodulator recovers an information signal represented by the received RF signal from output signals of the first and second low pass filters. A frequency error detector operates for detecting an error between a frequency of a carrier of the received RF signal and the frequency of the first local oscillator signal in response to the information signal recovered by the demodulator. An oscillator controller operates for controlling the frequency of the first local oscillator signal in response to the error detected by the frequency error detector. A filter controller operates for controlling the cutoff frequencies of the first and second low pass filters in response to the error detected by the frequency error detector.
摘要翻译：直接转换接收机包括用于产生具有可变频率的第一本机振荡器信号的本地振荡器。 90°移相器用于将第一本地振荡器信号的相位移位90°以将第一本机振荡器信号转换为第二本机振荡器信号。第一混频器用于混合接收的RF信号和第一本地振荡器信号。第二混频器用于混合接收到的RF信号和第二本地振荡器信号。第一低通滤波器处理第一混频器的输出信号。第一个低通滤波器具有可控的截止频率。第二低通滤波器处理第二混频器的输出信号。第二低通滤波器具有可控的截止频率。解调器从第一和第二低通滤波器的输出信号中恢复由接收的RF信号表示的信息信号。频率误差检测器用于响应于由解调器恢复的信息信号来检测接收的RF信号的载波的频率与第一本地振荡器信号的频率之间的误差。振荡器控制器用于响应于由频率误差检测器检测到的误差来控制第一本地振荡器信号的频率。滤波器控制器用于响应于由频率误差检测器检测到的误差来控制第一和第二低通滤波器的截止频率。

5. 发明授权

US5361408A Direct conversion receiver especially suitable for frequency shift keying (FSK) modulated signals 失效
标题翻译：直接转换接收机特别适用于频移键控（FSK）调制信号
公开(公告)号：US5361408A
公开(公告)日：1994-11-01
申请号：US734447
申请日：1991-07-23
申请人： Kazunori Watanabe , Yasumi Imagawa , Makoto Hasegawa , Kazuaki Takahashi
发明人： Kazunori Watanabe , Yasumi Imagawa , Makoto Hasegawa , Kazuaki Takahashi
IPC分类号： H04L27/14 , H03D3/00 , H03D7/16 , H04B1/30 , H04B15/06 , H04B1/16 , H04B1/00
CPC分类号： H03D3/007 , H04B1/30 , H03D7/165
摘要： A direct conversion receiver for providing a direct conversion of a radio frequency signal having a carrier frequency comprises a local oscillator for substantially equal frequency to the carrier, and a semiconductor integrated circuit mounting mixers and amplifiers for amplifying inputs to the mixer. The amplifiers amplify the local oscillation signals and/or radio frequency signal inputted from the outside of the semiconductor integrated circuit and supply the amplified signals to the mixers. The mixers mix these inputted signals and output the mixed signals to the outside of the semiconductor integrated circuit. By thus forming the receiver, radiation of the local oscillation signals to outside of the receiver and leakage inside thereof can be suppressed.
摘要翻译：用于提供具有载波频率的射频信号的直接转换的直接转换接收机包括用于与载波基本相等的频率的本地振荡器，以及用于放大输入到混频器的半导体集成电路安装混频器和放大器。放大器放大从半导体集成电路的外部输入的本地振荡信号和/或射频信号，并将放大的信号提供给混频器。混频器混合这些输入的信号，并将混合信号输出到半导体集成电路的外部。通过这样形成接收器，可以抑制本地振荡信号的辐射到接收器外部并在其内部泄漏。

6. 发明申请

US20090270031A1 DIVERSITY RECEIVING DEVICE AND DIVERSITY RECEIVING METHOD 审中-公开
标题翻译：多样化接收设备和多样性接收方法
公开(公告)号：US20090270031A1
公开(公告)日：2009-10-29
申请号：US12302107
申请日：2006-06-09
申请人： Hiroyuki Yokonaga , Yasumi Imagawa , Makoto Sasaki
发明人： Hiroyuki Yokonaga , Yasumi Imagawa , Makoto Sasaki
IPC分类号： H04B7/24
CPC分类号： H04B7/08
摘要： It is a theme of the present invention to provide a diversity receiving device and a diversity receiving method capable of making a diversity start not to cause receiving errors and also improving a sensitivity. There is a difference in a jamming wave level that is allowed to get the same received quality between the diversity reception and the single branch reception, so that a gain improving effect equivalent to a diversity gain is expected by the diversity reception in contrast to the single branch reception. Therefore, a dynamic range of the jamming wave from a transmitting portion (105) of a second radio system in a radio terminal is set smaller in expectation of the improving effect of such jamming wave resistance, and then a transmission control signal (S117) is acquired from a transmission signal controlling portion (106). Thus, the diversity reception is started before a start of transmission, and diversity control is applied adaptively without deterioration of the received quality. With such arrangement, NF of the system is improved at the same time, and as a result a receiving sensitivity in both the single branch reception and the diversity reception can be improved.
摘要翻译：本发明的主题是提供一种分集接收装置和分集接收方法，其能够使分集开始不引起接收错误并且还提高灵敏度。在允许在分集接收和单分支接收之间获得相同接收质量的干扰波电平存在差异，从而通过分集接收来预期与分集增益相当的增益改善效果，与单分分会招待会。因此，期望无线终端中的第二无线电系统的发送部分（105）的干扰波的动态范围被设置为较小，期望这种干扰波电阻的改善效果，然后发送控制信号（S117）是从传输信号控制部分（106）获取。因此，在开始发送之前开始分集接收，并且自适应地应用分集控制，而不会降低接收质量。通过这样的配置，可以同时改善系统的NF，从而可以提高单分支接收和分集接收两者的接收灵敏度。

7. 发明授权

US5179727A Automatic adjusting circuit for an analog filter 失效
标题翻译：用于模拟滤波器的自动调整电路
公开(公告)号：US5179727A
公开(公告)日：1993-01-12
申请号：US478577
申请日：1990-02-12
申请人： Yasumi Imagawa
发明人： Yasumi Imagawa
IPC分类号： H03G5/24 , H03H11/04
CPC分类号： H03G5/24 , H03H11/0472
摘要： The center frequency of each of the analog filters with different selectivities each other installed in an automatic adjusting circuit is automatically adjusted in accordance with a bias input signal which is generated by the phases detectors respectively associated with the analog filters in accordance with a frequency difference, so as to be equal to the reference frequency of an input signal applied to the two analog filters. The bias input signal is fed to an analog filter to be controlled, which is formed on the same chip as that of the above two filters. A coarse adjustment is based on the output signal of the phase detector associated with the analog filter with a low selectivity. A fine adjustment is based on the output signal of the phase detector associated with the analog filter with a high selectivity. An accuracy of matching the center frequency to the reference frequency is determined by both the selectivity of the analog filter with a high selectivity and the ratio of the output signals of the two phase detectors in the automatic adjusting circuit.

8. 发明申请

US20090238314A1 DIVERSITY RECEIVING DEVICE 失效
标题翻译：多样化接收设备
公开(公告)号：US20090238314A1
公开(公告)日：2009-09-24
申请号：US12297827
申请日：2006-04-20
申请人： Yasumi Imagawa , Kazuhiko Nakayama , Makoto Sasaki
发明人： Yasumi Imagawa , Kazuhiko Nakayama , Makoto Sasaki
IPC分类号： H04L27/08
CPC分类号： H04B7/0817 , H04B7/0871 , Y02D70/168 , Y02D70/444
摘要： It is a theme of the present invention to provide a diversity receiving device capable of reducing a power consumption to the utmost extent while keeping a predetermined received quality without measurement of an electric field strength and a fading pitch. A decision about whether or not the diversity reception is executed is made by sensing a received quality. Also, a diversity gain is reduced by a predetermined value by controlling the diversity gain in the diversity reception, then a receiving operation of a predetermined branch or a branch whose received quality is low is stopped when the received quality at that time is in excess of a previously set value, and then a supply of power to all circuit or a partial circuit of the branch whose receiving operation is stopped is shut down. Accordingly, a power consumption can be reduced to the utmost extent while keeping a predetermined received quality.
摘要翻译：本发明的主题是提供一种分集接收装置，其能够在不测量电场强度和衰落间距的同时保持预定接收质量的同时最大程度地降低功耗。通过感测接收到的质量来确定是否执行分集接收。此外，通过控制分集接收中的分集增益，分集增益减小预定值，则当接收质量超过时，停止接收质量低的预定分支或分支的接收操作先前设定的值，然后对接收操作停止的分支的所有电路或部分电路供电。因此，可以在保持预定的接收质量的同时最大程度地降低功耗。

9. 发明授权

US5448774A Intermittent operation receiver 失效
标题翻译：间歇操作接收器
公开(公告)号：US5448774A
公开(公告)日：1995-09-05
申请号：US229109
申请日：1994-04-18
申请人： Katsushi Yokozaki , Yasumi Imagawa
发明人： Katsushi Yokozaki , Yasumi Imagawa
IPC分类号： H04B1/18 , H03G3/20 , H04L27/14 , H04Q7/18 , H04B1/16
CPC分类号： H03G3/3068
摘要： A direct conversion type FSK receiver has an intermittent reception mode and includes a detecting and holding device in a low frequency unit and a gain control device in a high frequency unit. The receiver starts a reception operation in response to an intermittent reception control signal and controls the gain of the high frequency unit based on the detection of the received signal strength level before an interval of time during which the receiver receives a signal transmitted for the receiver and maintains the controlled gain for that interval of time. As a result, the receiver has reduced reception disturbance, which disturbance is due to intermodulation occurring when a large input signal is received.
摘要翻译：直接转换型FSK接收机具有间歇接收模式，并且包括低频单元中的检测和保持装置以及高频单元中的增益控制装置。接收机响应于间歇接收控制信号开始接收操作，并且基于在接收机接收到针对接收机发送的信号的时间间隔之前的接收信号强度电平的检测来控制高频单元的增益，以及维持该时间间隔的可控增益。结果，接收机具有减少的接收干扰，该干扰是由于当接收到大的输入信号时发生互调。

10. 发明授权

US5387820A Power supply circuit 失效
标题翻译：电源电路
公开(公告)号：US5387820A
公开(公告)日：1995-02-07
申请号：US914519
申请日：1992-07-17
申请人： Yasumi Imagawa
发明人： Yasumi Imagawa
IPC分类号： G05F1/577 , H02J7/00 , H02M3/00
CPC分类号： G05F1/577 , H02J7/0029 , H02J7/0065 , Y10T307/406 , Y10T307/43 , Y10T307/469
摘要： An apparatus using a battery as a power source requires a battery having an extended life time. A burden upon a battery can be reduced by operating the inner circuit at a low voltage and current. The present invention aims at providing a compact and low power consuming apparatus. A battery used as a power source drives a circuit for a low voltage circuit system and a switching circuit which switches power supply when the battery voltage becomes a preset voltage. A circuit for a high voltage circuit is directly driven by the battery when the battery voltage is high, and the circuit is powered from the output (for example, 1.5 volts) of a step-up circuit when the battery voltage is low. Switching of power sources is made in such a manner, resulting in low power consumption. Extension of life time of battery, and reduction in size of battery and apparatus can be achieved.
摘要翻译：使用电池作为电源的装置需要具有延长的使用寿命的电池。通过以低电压和电流操作内部电路，可以降低对电池的负担。本发明旨在提供一种紧凑且低功耗的装置。用作电源的电池驱动用于低压电路系统的电路和当电池电压变为预设电压时切换电源的开关电路。当电池电压高时，用于高压电路的电路由电池直接驱动，并且当电池电压低时，电路由升压电路的输出（例如，1.5伏特）供电。以这样的方式进行电源的切换，导致低功耗。可以延长电池寿命，减少电池和设备的尺寸。

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