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公开(公告)号：EP0074858A3
公开(公告)日：1984-09-19
申请号：EP82304870
申请日：1982-09-15
CPC分类号： H03D3/007 , H03D1/00 , H03D1/24 , H03D3/006 , H03D5/00 , H03D7/165 , H03D2200/0025 , H03D2200/0035 , H03D2200/005 , H03D2200/0052
摘要： A multi-mode radio receiver divides the radio frequency input into two channels and in each channel mixes it with the carrier wave frequency. A quadrature shift in the mixing carrier wave frequencies enables base band signals to be filtered from the mixer outputs. The analogue quadrature signals are converted to digital form and processed digitally to reproduce the original modulating signal for am, fm or pm transmissions. For ssb modulation the mixing frequency is the side band centre frequency instead of carrier frequency.
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22.发明公开
公开(公告)号：EP2833546A4
公开(公告)日：2016-01-20
申请号：EP12873391
申请日：2012-12-07
发明人： PARK SEUNG YOUNG , KIM SANG IL
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公开(公告)号：EP1049261A3
公开(公告)日：2003-09-10
申请号：EP00303588.8
申请日：2000-04-28
CPC分类号： H03D1/00 , H03D3/001 , H03D2200/0047 , H04B1/30 , H04B1/69
摘要： A receiver (54) comprising an input for receiving an RF signal (Figure 7) centered at a first frequency and having a bandwidth. The receiver also comprises a first mixer (62) for producing a first output signal. The first output signal results from mixing the RF signal with a signal having an energy spreading portion (p(t)) and a down-converting portion (c(t)). Moreover, this first output signal comprises a self-mixing DC signal (c(t)p(t) self-mixing DC component) and a down-converted and energy spread RF signal (Figure 11) . The receiver further comprises a second mixer (70) for producing a second output signal by mixing a signal responsive to the first output signal with the energy spreading portion of the signal. The second output signal comprises two signals, namely: (1) a baseband signal (down-converted RFA I ) responsive to the down-converted and energy spread RF signal; and (2) a portion of the spread DC signal (spread DC).
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公开(公告)号：EP0862263A2
公开(公告)日：1998-09-02
申请号：EP97309232.3
申请日：1997-11-17
发明人： Muraishi, Akihiro
摘要： An amplitude-modulated carrier signal is demodulated by passage through an limiting amplifier that converts the amplitude-modulated carrier signal to a signal of constant amplitude, and also produces a received signal strength indicator signal. The received signal strength indicator signal is used as the demodulated signal.
摘要翻译： 幅度调制载波信号通过限幅放大器进行解调，该限幅放大器将幅度调制的载波信号转换为恒定幅度的信号，并产生接收的信号强度指示信号。 接收到的信号强度指示信号用作解调信号。
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公开(公告)号：EP0614582A4
公开(公告)日：1994-11-09
申请号：EP92925347
申请日：1992-11-27
发明人： RHODES SMITH A
CPC分类号： H04L27/2332 , H03D1/00 , H04L7/0029 , H04L7/0334 , H04L7/04 , H04L7/10 , H04L2027/0048 , H04L2027/0085
摘要： Digital demodulator processing (Fig. 5) is accomplished for the reception of burst transmission (401) without preamble overhead (Fig. 3b) for synchronization acquisition. It is assumed that the modulation technique is either binary phase-shift keying (BPSK) (250) or quarternary phase-shift keying (QPSK) (250). The required synchronization (506), filtering (504, 505) and detection (512) functions for the demodulator are performed sequentially by repeated digital processing of stored complex baseband samples (501) of the received transmission burst (401).
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公开(公告)号：EP0609717A2
公开(公告)日：1994-08-10
申请号：EP94100839.3
申请日：1994-01-21
IPC分类号： H04L27/22
CPC分类号： H03D1/00
摘要： A carrier detector which is capable of performing high-accuracy carrier detection even with patterns other than a CR pattern by processing signals on the frequency axis, regardless of the existence of the residual frequency due to the quasi-coherent detection. The carrier detector converts a received signal having been subject to the quasi-coherent detection, A/D conversion, filtering for eliminating noises and expressed on the time axis into that expressed on the frequency axis by the time axis/frequency axis converting circuit. An accumulator 2 accumulatively adds the signals expressed on the frequency axis, and a decision section compares the accumulated value output from the accumulator to a predetermined threshold to detect the coming of the burst so as to detect the carrier.
摘要翻译： 载波检测器，即使通过处理频率轴上的信号，也可以通过对CR图案以外的图案进行高精度载波检测，而不管由于准相干检测是否存在残留频率。 载波检测器将经过准相干检测，A / D转换，用于消除噪声的滤波和在时间轴上表示的接收信号转换成由时间轴/频率轴转换电路在频率轴上表示的接收信号。 累加器2累加在频率轴上表示的信号，并且判定部分将从累加器输出的累加值与预定阈值进行比较，以检测突发的到来以检测载波。
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公开(公告)号：EP0331246B1
公开(公告)日：1994-01-19
申请号：EP89200447.4
申请日：1989-02-22
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29.发明授权Circuit arrangement for linearly amplifying and demodulating an AM-modulated signal, and integrated semiconductor element for said circuit arrangement 失效用于线性放大和解调调制信号的电路布置，以及集成电路布置的集成半导体元件
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公开(公告)号：EP0472510A3
公开(公告)日：1992-09-16
申请号：EP91850204.8
申请日：1991-08-21
发明人： Dent, Paul Wilkinson
摘要： An amplifier/detector chain logarithmically amplifies an input signal as well as compensates for delays generated by necessary bandwidth restrictions. A plurality of amplifiers are connected in series and grouped in amplifier stages with each stage having at least one amplifier. In between each amplifier stage is a filter which restricts the bandwidth of signals to frequencies in a desired signal range. When an amplifier stage includes more than one amplifier, a local summer sums the outputs detected by detectors associated with each amplifier in a particular stage. When an amplifier stage includes only a single amplifier associated detector, the local sum signal for the stage is simply the detector output. No local summer is required. Because of the time delay introduced by each interposed filter, each local sum is input to a corresponding compensating device which compensates for the associated time delay. Each compensating device stores its corresponding local sum until the local sum from the final stage is ready to be output. When all of the local summer outputs have been time-aligned or brought in phase, the local sums are connected from their corresponding compensating devices to a central summer stage. The output of the central summer represents the instantaneous output of the logarithmically amplified input signal.
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