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2. 发明公开

EP0486095A1 Digital receiver 失效
标题翻译： DigitalerEmpfänger
公开(公告)号：EP0486095A1
公开(公告)日：1992-05-20
申请号：EP91202892.5
申请日：1991-11-07
申请人： Philips Electronics N.V.
发明人： Gielis, Gerardus Christiaan Maria , van der Plassche, Rudy Johan
IPC分类号： H03D3/00
CPC分类号： H04N5/44 , H03B23/00 , H03B28/00 , H03B2200/0092 , H03D1/2245 , H03D3/006 , H03D3/007 , H03D5/00 , H03D7/00 , H03D2200/005 , H03D2200/0054
摘要： Receiver comprising an A/D converter (5) for digitally sampling an analog signal modulated on a carrierfrequency at a first sampling frequency, consecutively coupled to a digital quadrature mixer stage (6) for a carrier frequency shift of the digitized modulated signal from the A/D converter, a digital filter device (10,11) for selecting the phase quadrature signals of the quadrature mixer stage and for decimating the sampling frequency from said first sampling frequency to a second sampling frequency, and a digital demodulation device (12,13). To obtain a receiver which can be easily realised in an integrated form and for which less crystal surface is required than for the digital integrable receivers hitherto known, and which is particularly suitable for receiving RF radio or TV broadcast signals, the digital quadrature mixer stage comprises a first coordinate rotation digital computer (Cordic) (9) in the rotation mode, having at least a first signal input which is coupled to an output of the A/D converter and a phase signal input to which a periodical digital sawtooth-shaped phase signal is applied from a digital sawtooth generator (SG) for a periodical 2π phase rotation of at least the signal applied to the computer via the first signal input at a repetition frequency which is equal to the magnitude of said carrierfrequency shift.
摘要翻译：接收机包括：A / D转换器（5），用于以第一采样频率数字采样在载波频率上的模拟信号，连续地耦合到数字正交混频器级（6），用于来自A的数字化调制信号的载波频移 / D转换器，用于选择正交混频器级的相位正交信号并将采样频率从所述第一采样频率抽取到第二采样频率的数字滤波器装置（10,11），以及数字解调装置（12,13 ）。为了获得能够容易地以集成形式实现的接收机，并且与迄今为止已知的数字可积分接收机相比，需要较少的晶体表面，并且其特别适用于接收RF无线电或TV广播信号，数字正交混频器级包括旋转模式中的第一坐标旋转数字计算机（Cordic）（9），具有耦合到A / D转换器的输出端的至少第一信号输入端和输入周期性的数字锯齿形相位的相位信号输入端信号从数字锯齿波发生器（SG）施加，用于至少通过第一信号输入施加到计算机的信号的周期性2π相位旋转，其重复频率等于所述载波频率的幅度。

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