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    • 2. 发明专利
    • Clock regeneration circuit and receiver using the same
    • 时钟再生电路和接收器
    • JP2010041139A
    • 2010-02-18
    • JP2008198884
    • 2008-07-31
    • Icom Incアイコム株式会社
    • SHIBATA KAZUNORI
    • H04L27/14H04L7/00
    • H04L27/14H04L7/0334H04L27/16
    • PROBLEM TO BE SOLVED: To obtain a stable symbol clock by a small operation amount even in a multi-valued FSK (Frequency Shift Keying) demodulated signal when sampling the FSK demodulated signal and regenerating demodulated data from an amplitude value of obtained symbol data. SOLUTION: A quadrature FSK demodulated signal is oversampled by a frequency higher than that of a symbol clock, difference values V1 to V3 from an ideal amplitude level obtained at a symbol point P with respect to the sample data of three points, i.e. a point T2 close to the symbol point P and preceding and succeeding points T1, T3 of the point T2, and the sampling timing of a self-advancing timer is moved to the measurement (sampling) point side of which the difference value is smaller out of the difference values V1, V3 of the preceding and succeeding points T1, T3 only by time corresponding to the difference value V2 of the point T2. Thereby, the shift of the sampling timing is gradually corrected in each oversampling timing at maximum and a stable symbol clock can be regenerated. Timing operation is allowed to execute only at the three points T1, T2, T3, thereby the operation amount can be reduced. COPYRIGHT: (C)2010,JPO&INPIT
    • 要解决的问题:即使在对FSK解调信号进行采样并且从获得的符号的振幅值再生解调数据时,即使在多值FSK(频移键控)解调信号中也能以小的运算量获得稳定的符号时钟 数据。 解决方案:正交FSK解调信号以比符号时钟更高的频率进行过采样,相对于三个点的采样数据,在符号点P获得的理想振幅电平的差值V1至V3,即 点T2靠近符号点P和点T2的前后点T1,T3,并且自提前定时器的采样定时被移动到其差值较小的测量(采样点)侧 只有前一个和后一个点T1,T3的差分值V1,V3只有与点T2的差值V2对应的时间。 因此,在每个过采样定时最大化地逐渐校正采样定时的移位,并且可以再生稳定的符号时钟。 只允许在三点T1,T2,T3执行定时操作,从而可以减少操作量。 版权所有(C)2010,JPO&INPIT
    • 3. 发明专利
    • Frequency fluctuation correcting circuit
    • 频率波动校正电路
    • JPS6152051A
    • 1986-03-14
    • JP17312984
    • 1984-08-22
    • Mitsubishi Electric Corp
    • TAMURA KAZUNORI
    • H04L27/10H04L27/16
    • H04L27/16
    • PURPOSE:To obtain a stable and miniaturized frequency fluctuation correcting circuit with less characteristic fluctuation by correcting a frequency fluctuation included in a digital signal after a converting a signal whose frequency fluctuation is to be corrected into the digital signal. CONSTITUTION:A base band signal x(t) via an input terminal 1 and a signal v(t) representing a frequency fluctuation DELTAf via an input terminal 9 are inputted respectively to A/D converters 11, 12, and after they are converted into digital signals, the result is inputted to phase shifters 13, 14 shifting digitally the phase by 90 deg. on the time axis. A multiplier 15 multiplies outputs of the converters 11, 12 and a multiplier 16 multiplies outputs of the phase shifters 13, 14. The output of the multipliers 15, 16 is inputted to an adder 17, where it is added and converted into an analog signal by a D/A converter 18 and outputted from an output terminal 8 as the signal subject to frequency fluctuation correction.
    • 目的:通过在将频率波动要被校正的信号转换为数字信号之后,通过校正数字信号中包括的频率波动来获得具有较小特性波动的稳定且小型化的频率波动校正电路。 构成:经由输入端子1的基带信号x(t)和经由输入端子9表示频率波动DELTAf的信号v(t)被分别输入到A / D转换器11,12,并且在它们被转换成 数字信号,结果被输入到移相器13,14将数字相位移位90度。 在时间轴上。 乘法器15将转换器11,12的输出相乘,并且乘法器16将移相器13,14的输出相乘。乘法器15,16的输出被输入到加法器17,并将其相加并转换为模拟信号 由D / A转换器18输出,作为进行频率波动校正的信号从输出端子8输出。
    • 4. 发明专利
    • Automatic frequency control system
    • 自动频率控制系统
    • JPS59198054A
    • 1984-11-09
    • JP7245383
    • 1983-04-25
    • Fujitsu Ltd
    • MISHIRO TOKIHIRO
    • H04L27/14H04L27/16
    • H04L27/16
    • PURPOSE:To apply an AFC to an FSK modulating wave without using a pilot signal by utilizing a mark signal or a space signal being consecutive for a prescribed time or over included in a completely random digital signal. CONSTITUTION:The 1st input terminal of a frequency converting section CON is connected to a terminal IN, the 2nd input terminal is connected to an output terminal of a voltage controlled oscillator VCO, and the output terminal is connected to a terminal OUT respectively. The input terminals of a frequency discriminator DIS and a band pass filter BPF-2 are connected respectively to the terminal OUT, an output terminal of the frequency discriminator DIS is connected to the 1st input terminal of an integration device INT-1 and the output terminal is connected to the input terminal of the voltage controlled oscillator VCO, respectively. On the other hand, an output terminal of the band pass filter BPF-2 is connected to an input terminal of a detector DEI, an output of the detector DEI is connected to an input terminal of a voltage comparator COM, and the output terminal is connected to the 2nd input terminal of the integration device INT-1, respectively.
    • 目的:通过利用一个标准信号或连续的规定时间或超过一个完全随机的数字信号的空间信号,而不使用导频信号将AFC应用于FSK调制波。 构成:变频部分CON的第一输入端子连接到端子IN,第二输入端子连接到压控振荡器VCO的输出端子,输出端子分别连接到端子OUT。 分频器DIS的输入端和带通滤波器BPF-2分别连接到端子OUT,鉴频器DIS的输出端连接到集成装置INT-1的第一输入端,输出端 分别连接到压控振荡器VCO的输入端子。 另一方面,带通滤波器BPF-2的输出端连接到检测器DEI的输入端,检测器DEI的输出端连接到电压比较器COM的输入端,输出端为 分别连接到集成装置INT-1的第二输入端。
    • 7. 发明专利
    • Frequency offset cancellation circuit and method and communication equipment
    • 频率偏移消除电路和方法与通信设备
    • JP2013123105A
    • 2013-06-20
    • JP2011270208
    • 2011-12-09
    • Lapis Semiconductor Co Ltdラピスセミコンダクタ株式会社
    • MIZUNO KOTARO
    • H04L27/14
    • H04L27/1563H03B28/00H04B1/16H04L27/0014H04L27/16H04L2027/003H04L2027/0067
    • PROBLEM TO BE SOLVED: To cancel a frequency offset by quickly and accurately tracking up to a payload section.SOLUTION: The frequency level of a baseband signal is sampled at 0.5 symbol intervals to obtain a series of sample levels. On the basis of any first frequency level among the sample levels, a difference in absolute value between each of frequency levels adjoining each other every 1 symbol interval is calculated in plurality as a first differential absolute value. On the basis of a second frequency level 0.5 symbols after the first frequency level among the sample levels, a difference in absolute value between each of frequency levels adjoining each other every 1 symbol interval is calculated in plurality as a second differential absolute value. An average value of the sample levels used in calculating the first and the second differential absolute values is calculated, and if the first differential absolute value is larger than a preset first determination value and the second differential absolute value is smaller than a preset second determination value, the average value is set as a frequency offset.
    • 要解决的问题:通过快速准确地跟踪到有效载荷部分来取消频率偏移。 解决方案:以0.5个符号间隔对基带信号的频率电平进行采样,以获得一系列采样电平。 基于采样电平中的任何第一频率电平,每隔1个符号间隔彼此相邻的每个频率电平之间的绝对值之差被计算为多个作为第一差分绝对值。 基于采样电平之后的第一频率电平之后的0.5个符号的第二频率电平,每隔1个符号间隔彼此相邻的每个频率电平之间的绝对值之差被计算为多个作为第二差分绝对值。 计算在计算第一和第二差分绝对值时使用的采样电平的平均值,并且如果第一差分绝对值大于预设的第一确定值,并且第二差分绝对值小于预设的第二确定值 ,将平均值设置为频率偏移。 版权所有(C)2013,JPO&INPIT