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    • 3. 发明授权
    • Ghost cancellation of analog TV signals
    • GHOST取消模拟电视信号
    • US5119196A
    • 1992-06-02
    • US542612
    • 1990-06-25
    • Ender AyanogluIsrael Bar-DavidRichard D. GitlinChih-Lin IJack H. Winters
    • Ender AyanogluIsrael Bar-DavidRichard D. GitlinChih-Lin IJack H. Winters
    • H04N5/21
    • H04N5/211
    • Ghosts are canceled in received analog TV (for IDTV, EDTV, and HDTV) signals by utilizing the fact that there are short periods of time without the analog signals (the horizontal flyback interval between the lines) to process the received signal on a line-to-line basis using a finite impulse response (FIR) or an infinite impulse response (IIR) equalizer. This line-by-line processing (which can be implemented by periodic cleansing of the equalizer) overcomes the limitations of standard equalizers to allow for 40-50 dB of suppression of ghosts, even with nulls in the spectrum, as long as the ghost delay is less than the period of time without the analog signal. Furthermore, by using time inversion in combination with line-by-line processing, the stability problem of the conventional IIR equalizer is eliminated. The IIR equalizer may be implemented on a single digital integrated circuit. Alternatively, an FIR equalizer can be used which, although it may require multiple chips (i.e., more taps), can acquire and adapt to the ghosted channel more rapidly than an IIR equalizer. With line-by-line processing, FIR and IIR equalizers can eliminate any ghost with delays up to 11 .mu.sec in IDTV or EDTV. For larger delays, a standard IIR or FIR equalizer can be used as a preprocessor to eliminate small ghosts and an adaptive antenna can be used to eliminate large ghosts. Thus, with these techniques, the ghosting problem can be eliminated in all TV receivers.
    • 6. 发明授权
    • High speed quantization-level-sampling modem with equalization
arrangement
    • 具有均衡布置的高速量化级采样调制解调器
    • US5528625A
    • 1996-06-18
    • US176742
    • 1994-01-03
    • Ender AyanogluGlenn D. GoldenRaymond K. JonesJames E. MazoDavid G. Shaw
    • Ender AyanogluGlenn D. GoldenRaymond K. JonesJames E. MazoDavid G. Shaw
    • H03H21/00H04B3/04H04B14/04H04L25/49H04L5/16H03K7/02H04B1/38H04L27/02
    • H04L25/4927
    • The present invention is a quantization-level-sampling (QLS) modem which includes means for separately equalizing each loop of an end-to-end digital telephone system network connection by employing a plurality of transmitter filters and a plurality of receiver filters in such a way that, in the direction of transmission from modem to central office, the voltage samples seen by the coder/decoder stations are equivalent to the network quantization levels transmitted by the modem, and in the direction of transmission from central office to modem, the voltage samples seen by the modem are equivalent to the network quantization levels encoded by the coder/decoder stations. The invention also includes a QLS modem communications system which includes the aforesaid digital telephone system network and a plurality of QLS modems. In preferred embodiments, an adaptation service unit within the telephone system network assists in the determination of the settings of the transmitter and receiver filters.
    • 本发明是量化级采样(QLS)调制解调器,其包括通过采用多个发射机滤波器和多个接收机滤波器来分别均衡端到端数字电话系统网络连接的每个环路的装置 在从调制解调器到中心局的传输方向上,由编码器/解码器站所看到的电压样本等同于由调制解调器发送的网络量化级别,并且在从中心局到调制解调器的传输方向上,电压 由调制解调器看到的样本等同于由编码器/解码器站编码的网络量化级。 本发明还包括一个包括上述数字电话系统网络和多个QLS调制解调器的QLS调制解调器通信系统。 在优选实施例中,电话系统网络内的适配服务单元有助于确定发射机和接收机滤波器的设置。