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1. 发明申请

WO1989012359A1 SIGNAL PROCESSOR 审中-公开
标题翻译：信号处理器
公开(公告)号：WO1989012359A1
公开(公告)日：1989-12-14
申请号：PCT/JP1989000579
申请日：1989-06-07
申请人： FUJITSU LIMITED , KAKUISHI, Mitsuo , UESHIMA, Tsuyoshi
发明人： FUJITSU LIMITED
IPC分类号： H03H17/02
CPC分类号： H03M1/20 , H03M1/1235
摘要： Use is made of two A/D conversion systems of low accuracy to obtain digital output signals maintaining higher conversion accuracy than that of only one A/D conversion. By using two D/A conversion systems of low accuracy, furthermore, analog output signals are obtained maintaining higher conversion accuracy than that of only one D/A conversion system. Provision is further made of digital signal clock conversion means for forming second digital data in synchronism with second clocks by the interpolation processing based on the data obtained by highly sampling first digital data series and a difference between the first clock timing and the second clock timing. Using two PCM.CODEC's (54, 55) and one DSP which are cheap and small in size, A/D and D/A conversions are realized maintaining high accuracy. Therefore, the signal processing that was so far carried out using a large-scale analog circuit is now carried out easily using one DSP. In this case, furthermore, the digital signal clock conversion means is realized in the same DSP as the digital signal processing.

2. 发明申请

WO1993015580A1 CIRCUIT FOR DETECTING OBJECT SIGNAL FROM INPUT SIGNAL 审中-公开
标题翻译：用于从输入信号中检测对象信号的电路
公开(公告)号：WO1993015580A1
公开(公告)日：1993-08-05
申请号：PCT/JP1993000100
申请日：1993-01-28
申请人： FUJITSU LIMITED , AWATA, Yutaka , KAKUISHI, Mitsuo
发明人： FUJITSU LIMITED
IPC分类号： H04L27/00
CPC分类号： H04Q1/50 , G06F1/32 , H04L2007/047 , H04Q1/30
摘要： An input analog signal having periodicity is converted to a 1-bit digital signal by an A/D convertor (42) and is then converted to a parallel signal by a serial-parallel convertor (43). Correlation between the parallel signal and a reference signal train is calculated by a correlation device (45). When this correlationship is obtained, it is held by a hold circuit (48) and a tone signal detection result is outputted. In this way, the tone signal is detected by a simple circuit construction having low power consumption.

3. 发明申请

WO1991003872A1 CONVERSION ADAPTOR FOR WAVE DIGITAL FILTER AND BALANCING NETWORK USING WAVE DIGITAL FILTER 审中-公开
标题翻译：波形数字滤波器和平衡滤波器的转换适配器使用波数字滤波器
公开(公告)号：WO1991003872A1
公开(公告)日：1991-03-21
申请号：PCT/JP1990001120
申请日：1990-08-31
申请人： FUJITSU LIMITED , KAKUISHI, Mitsuo
发明人： FUJITSU LIMITED
IPC分类号： H03H17/02
CPC分类号： H03H17/0201
摘要： A balancing network of wave digital filter type consisting of three-terminal-pair conversion adaptors (21 to 26) connected in cascade each of which having a capacitor (C) and a resistor (R) as constituent elements to exhibit a filter operation function. Based on the fact that no wave is reflected by a terminal pair other than the two terminal pairs for cascade connection of the conversion adaptors (22, 24, 26) that include the resistor (R), the above terminal pair is excluded and these adaptors are combined with the neighboring conversion adaptors (21, 23, 25) that include the capacitor (C) in order to form a new three-terminal-pair-combined conversion adaptor (41) which realizes a filter function with an operation amount which is smaller than the sum of operation amounts of the three-terminal-pair conversion adaptors (21 to 26).

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