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    • 2. 发明授权
    • Wireless frequency power amplifier, semiconductor device, and wireless frequency power amplification method
    • 无线频率功率放大器,半导体器件和无线频率功率放大法
    • US07683712B2
    • 2010-03-23
    • US12052857
    • 2008-03-21
    • Hidefumi SuzakiJunji ItoFumiya KamimuraShigeki Nakamura
    • Hidefumi SuzakiJunji ItoFumiya KamimuraShigeki Nakamura
    • H03G9/00
    • H03F3/19H03F1/30H03G3/3042
    • A differential amplifier circuit is connected to the input node and the output node of the final amplification stage through detection circuits. The signal level difference output from the differential amplifier circuit does not change even if the input power varies. Because a change in the power gain at the output node does not travel back to the input node when the load impedance of the wireless frequency power amplifier varies, it is possible to detect only the change in the load impedance. Damage to the final stage can be prevented by controlling the operating current of the final stage and the gain of the drive stage according to the detected load variation. Nonlinear distortion in the wireless frequency power amplifier output can also be reduced by detecting and canceling the change in the gain of the drive stage by changing the gain of the adjustment stage.
    • 差分放大器电路通过检测电路连接到最终放大级的输入节点和输出节点。 即使输入功率变化,差分放大电路输出的信号电平差也不变。 因为当无线频率功率放大器的负载阻抗变化时,输出节点处的功率增益的改变不会返回到输入节点,所以可以仅检测负载阻抗的变化。 可以通过根据检测到的负载变化来控制最后级的工作电流和驱动级的增益来防止对最后级的损坏。 通过改变调节级的增益,可以通过检测和消除驱动级增益的变化来减小无线频率功率放大器输出中的非线性失真。
    • 6. 发明授权
    • Digital signal processing type demodulation method and demodulation
circuit
    • 数字信号处理型解调方式和解调电路
    • US5073904A
    • 1991-12-17
    • US354918
    • 1989-05-22
    • Shigeki NakamuraYasufumi Takahashi
    • Shigeki NakamuraYasufumi Takahashi
    • H04L27/00H03D1/00H04L7/00H04L7/02H04L27/22H04L27/38
    • H04L7/0029H03D1/00
    • Disclosed is a digital demodulation technique in which a reception modulated-wave signal is converted into a digital signal in synchronism with a sampling frequency, whereafter carrier regeneration/detection is carried out upon the digital signal to thereby output a detection signal. Then, the detection signal is subject to interpolation and resampling on the basis of a clock frequency established asynchronously with and independently of the sampling frequency, so that a timing component is extracted from the detection signal in synchronism with the clock frequency to thereby output a reception data. In the digital demodulation technique, since the sampling frequency and the clock frequency are established asynchronously with and independently of each other, jitter or the like produced in clock regeneration do not affect the carrier regeneration/detection. Consequently, noiseless reception data with little jitters can be regenerated.
    • 公开了一种数字解调技术,其中接收调制波信号与采样频率同步地转换为数字信号,之后对数字信号执行载波再生/检测,从而输出检测信号。 然后,基于与采样频率异步建立的时钟频率对检测信号进行内插和重采样,从而与时钟频率同步地从检测信号中提取定时分量,从而输出接收 数据。 在数字解调技术中,由于采样频率和时钟频率彼此异步地建立并且彼此独立地建立,所以在时钟再生中产生的抖动等不影响载波再生/检测。 因此,可以再生具有小抖动的无噪声接收数据。
    • 7. 发明授权
    • Carrier recovery phase-locked loop
    • 载波恢复锁相环
    • US4856027A
    • 1989-08-08
    • US173652
    • 1988-03-24
    • Shigeki NakamuraYasufumi Takahashi
    • Shigeki NakamuraYasufumi Takahashi
    • H04L27/22H04L27/00H04L27/227
    • H04L27/2273H04L2027/0057H04L2027/0095
    • A carrier recovery phase-locked loop for recovering a carrier from a digitized quadrature phase shift keying modulated wave arriving on time division basis comprises a PLL circuit, first unit, responsive to the received signal, for preparing a phase comparator's characteristic adapted for a binary phase shift keying modulated wave, second unit, also responsive to the received signal, for preparing a phase comparator's characteristic adapted for the quadrature phase shift keying modulated wave and switching unit for selectively supplying output signals from the first and second units to the PLL circuit. During reception of a preamble, the carrier is recovered using the binary phase comparator's characteristic through the PLL circuit.
    • 用于从按时分方式到达的数字化正交相移键控调制波恢复载波的载波恢复锁相环包括PLL电路,响应于接收信号的第一单元,用于准备适于二进制相位的相位比较器的特性 移位键控调制波,第二单元,也响应于接收信号,用于准备适用于正交相移键控调制波的相位比较器特性和用于选择性地将来自第一和第二单元的输出信号提供给PLL电路的切换单元。 在接收前置码时,通过PLL电路使用二进制相位比较器的特性恢复载波。
    • 10. 发明授权
    • Content reproduction apparatus, content recording apparatus, network system, and content recording/reproduction method
    • 内容再现装置,内容记录装置,网络系统和内容记录/再现方法
    • US07970137B2
    • 2011-06-28
    • US11065198
    • 2005-02-23
    • Shigeki Nakamura
    • Shigeki Nakamura
    • H04L9/18H04L15/30
    • H04N5/765H04N21/2747H04N21/42684H04N21/4334H04N21/43615H04N21/43622H04N21/4367
    • Content reproduction apparatus, content recording apparatus, network system, and method of recording and reproducing content are provide. The content reproduction apparatus includes an original content reception section for receiving streams of original content; an encrypted content transmission section for encrypting the streams of original content received by the original content reception section for transmission so as to be recorded on an external content recording apparatus through a network; an information transmission section for transmitting information about the transmitted content including identifying information of a self apparatus so as to be recorded on a recording medium of the content recording apparatus in association with the encrypted streams of content; a content requesting section for requesting the content recording apparatus to acquire the encrypted streams of content recorded in association with the identifying information of the self apparatus; and a content reproduction section for receiving the encrypted streams of content transmitted from the content recording apparatus in accordance with the request, and decrypting the encryption for reproduction.
    • 提供内容再现装置,内容记录装置,网络系统以及记录和再现内容的方法。 内容再现装置包括用于接收原始内容的流的原始内容接收部分; 加密内容传输部分,用于加密由原始内容接收部分接收的用于传输的原始内容流,以便通过网络被记录在外部内容记录装置上; 信息发送部分,用于发送关于所发送的内容的信息,包括自身装置的识别信息,以便与加密的内容流相关联地记录在内容记录装置的记录介质上; 内容请求部分,用于请求内容记录装置获取与自身装置的识别信息相关联地记录的加密的内容流; 以及内容再现部分,用于根据该请求从内容记录装置接收加密的内容流,并解密用于再现的加密。