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    • 5. 发明授权
    • Use of wideband DTV overlay signals for brevity signaling and public safety
    • 使用宽带数字电视覆盖信号进行简洁信号和公共安全
    • US06498627B1
    • 2002-12-24
    • US09422441
    • 1999-10-21
    • John Erik HersheyMark Lewis GrabbKenneth Brakeley Welles, II
    • John Erik HersheyMark Lewis GrabbKenneth Brakeley Welles, II
    • H04N521
    • H04N21/8146H04L27/28H04N5/211H04N5/44508H04N7/08H04N21/4432H04N21/478H04N21/814
    • A brevity signaling module for a digital television (DTV) receiver enables the reception of emergency broadcast messages. The overlay signal received at the receiver front end is squared in a squaring loop, producing spectral lines at DC and twice the overlay signal frequency, or 2&ohgr;, where &ohgr;=2&pgr;f and f is the center frequency of the overlay signal. The squared signal is passed through a narrow band filter having a bandwidth sufficient to pass a spectrum containing a plurality of tones 2&ohgr;, 2&ohgr;1, 2&ohgr;2, . . . , 2&ohgr;n, where 2&ohgr;1, 22, . . . , 2&ohgr;n are different frequency tones assigned to different auxiliary functions. The detected tone is used by a control module to determine whether normal multipath processing should be performed or whether this processing should be suppressed and auxiliary functions performed, including turning on the DTV receiver power in order that an emergency broadcast message might be conveyed to persons in the vicinity of the DTV receiver.
    • 用于数字电视(DTV)接收机的简洁信号模块能够接收紧急广播消息。 在接收机前端接收的覆盖信号在平方环中平方,产生DC和两倍叠加信号频率的频谱线,或2omega,其中ω= 2pif,f是叠加信号的中心频率。 平方信号通过具有足以通过包含多个音调2omega,2omega1,2omega2的频谱的带宽的窄带滤波器。 。 。 ,2omegan,其中2omega1,22。 。 。 ,2omegan是分配给不同辅助功能的不同频率音调。 检测到的音调由控制模块用于确定是否应执行正常的多路径处理,还是应该抑制该处理和执行辅助功能,包括接通DTV接收机的功率,以便将紧急广播消息传送给 DTV接收机附近。
    • 10. 发明授权
    • NTSC tuner to improve ATSC channel acquisition and reception
    • NTSC调谐器改善ATSC频道的采集和接收
    • US06538704B1
    • 2003-03-25
    • US09422444
    • 1999-10-21
    • Mark Lewis GrabbKenneth Brakeley Welles, IIJohn Erik Hershey
    • Mark Lewis GrabbKenneth Brakeley Welles, IIJohn Erik Hershey
    • H04N544
    • H04N5/4401H04N5/211H04N5/46H04N21/42638H04N21/4384
    • Reduction in the time required for an Advanced Television Standards Committee (ATSC) digital television tuner to equalize, converge, and acquire a digital television signal suitable for viewing, wherein early model ATSC tuners also include a National Television Standards Committee (NTSC) analog tuner, is achieved by using a microprocessor to control use of the NTSC tuner to scan television channels. A channel measurement module converts the scanned analog signal to a digital signal, and the equalization coefficients for the resultant digital signal are stored in memory. The equalization coefficients stored in memory are then accessed and utilized to tune in new channels on the ATSC tuner. The amount of time necessary for the ATSC tuner to tune in a new channel is thus reduced. When the ATSC tuner is in use, the equalization coefficient data stored in memory are periodically updated.
    • 降低高级电视标准委员会(ATSC)数字电视调谐器平衡,收敛和获取适合观看的数字电视信号所需的时间,其中早期模式ATSC调谐器还包括国家电视标准委员会(NTSC)模拟调谐器, 通过使用微处理器来控制NTSC调谐器的使用来扫描电视频道来实现。 通道测量模块将扫描的模拟信号转换为数字信号,并将所得数字信号的均衡系数存储在存储器中。 存储在存储器中的均衡系数然后被访问并用于调谐ATSC调谐器上的新通道。 因此,ATSC调谐器调谐到新频道所需的时间量减少。 当使用ATSC调谐器时,周期性地更新存储在存储器中的均衡系数数据。