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    • 2. 发明授权
    • FM Stereophonic system incorporating companding of difference signal
    • FM立体声系统包含差分信号的压扩
    • US4485483A
    • 1984-11-27
    • US476738
    • 1983-03-18
    • Emil L. TorickThomas B. Keller
    • Emil L. TorickThomas B. Keller
    • H03G7/00H04B1/64H04H20060101H04H1/00H04H20/48H04H20/88H04H5/00
    • H04H20/48H03G7/00H04B1/64
    • An FM stereophonic radio broadcasting system in which stereophonically related audio frequency source signals L and R are matrixed to obtain stereophonic sum and difference signals M and S, respectively. At the transmitter, the difference signal, is compressed, and the conventional difference signal and the compressed difference signal modulate respective quadrature-related sub-carriers of the same frequency to develop two double-sideband, suppressed-carrier signals, the frequency of the sub-carriers being sufficiently high as to assure a frequency gap between the lower sidebands of the modulated sub-carrier signals and the sum signal M. The M signal, the aforementioned suppressed-carrier signals, and a pilot signal having a frequency which lies within the frequency gap, are combined and frequency-modulated onto a high frequency carrier for the purpose of transmitting the same to one or more remote receivers. The receiver includes an expander for complementarily expanding the received compressed difference signal, and the expanded noise-reduced difference signal is combined with the received sum signal to reproduce the audio frequency source signals L and R. The system increases the broadcast coverage area over that of current biphonic service yet is compatible with existing monophonic and biphonic receivers.
    • 立体声相关的音频源信号L和R被矩阵化的FM立体声无线电广播系统分别获得立体声和差分信号M和S。 在发射机处,差分信号被压缩,并且传统的差分信号和压缩的差分信号调制相同频率的各个正交相关子载波以产生两个双边带,抑制载波信号,子频率 载波足够高以确保调制的子载波信号的下边带与和信号M之间的频率间隙.M信号,前述的抑制载波信号和具有位于该信号中的频率的导频信号 频率间隙被组合和频率调制到高频载波上,以将其发送到一个或多个远程接收机。 接收机包括用于互补地扩展接收的压缩差分信号的扩展器,并且扩展的降噪差信号与接收到的和信号相组合,以再现音频源信号L和R.系统增加广播覆盖区域超过 目前的双声道服务与现有的单声道和双声道接收机兼容。
    • 10. 发明授权
    • System for transmitting high-speed added-value services in terrestrial digital broadcasting
    • 用于在地面数字广播中传输高速附加值业务的系统
    • US06859501B1
    • 2005-02-22
    • US09403053
    • 1998-03-21
    • Gerd ZimmermannHenrik Schulze
    • Gerd ZimmermannHenrik Schulze
    • H04H20/00H04B7/22H04H20060101H04J11/00H04L1/08H04L27/00H04L27/04H04L27/32
    • H04B7/22H04J11/00H04L1/08H04L27/00H04L27/04H04L27/32
    • A broadband multi-frequency-block Extended Digital Audio Broadcasting X-DAB) transmission method for the interference-free transmission of value-added services at a high data rate to mobile receivers within an analog television channel. At least two simultaneously-broadcast adjacent X-DAB frequency blocks in a single-frequency network are provided. A digital input data stream is multiplexed onto the frequency blocks, with the input data steam being source-coded according to the service content of the input data stream. The input data stream is separated into a plurality of individual dens streams, with the individual data steams each having a respective quality of service importance and being distributed according to the respective quality of service importance among the at least two frequency blocks. The method offers a high degree of flexibility with regard to error protection profiles and thus data rates, and permits the implementation of non-constant-ratio error protection profiles, as well as hierarchical transmission.
    • 宽带多频块扩展数字音频广播X-DAB)传输方法,用于以高数据速率向模拟电视频道内的移动接收机的无干扰传输增值业务。 提供了单频网络中至少两个同时广播的相邻X-DAB频率块。 数字输入数据流被复用到频率块上,其中输入数据蒸汽根据输入数据流的服务内容进行源编码。 输入数据流被分成多个单独密度流,每个单独的数据流具有相应的服务质量重要性,并且根据至少两个频率块中的各个服务质量重要性进行分配。 该方法在错误保护配置文件和数据速率方面提供了高度的灵活性,并允许执行非常数比误差保护配置文件以及层次传输。