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    • 8. 发明授权
    • Automatic frequency selection in a bi-directional cable television system
    • 双向有线电视系统中的自动频率选择
    • US5225902A
    • 1993-07-06
    • US671539
    • 1991-03-19
    • Jay C. McMullan, Jr.
    • Jay C. McMullan, Jr.
    • H04H20/38H04H20/42H04H60/22H04H60/96H04H60/97H04L5/06H04L27/20H04L27/227H04N7/10H04N7/173H04N21/258H04N21/442
    • H04N7/17309H04H20/42H04H60/96H04H60/97H04L27/2035H04L27/2276H04L5/06H04N21/25891H04N21/44222H04N7/10H04H20/38H04H2201/70H04H60/22
    • A method for automatically selecting optimum frequencies for transmitting data from remote terminals upstream to a system manager is provided. The system manager initially selects a set of frequencies from a larger set of available frequencies and transmits a command downstream to each remote terminal indicating which frequencies to use. Each remote terminal transmits data messsages on each selected frequency in response to addressed commands generated by the system manager. The system manager receives and counts the data messages on each of the frequencies, and after a statistically significant number of messages are received, removes from use the frequency with the lowest number of data messages received. This frequency is replaced with either (1) a previously untried frequency, or if all frequencies have been tried, (2) a previously tried frequency with the highest number of data messages received. In a preferred embodiment, new frequencies are removed from use and added to use only when the number of data messages received and the received signal level on a particular frequency falls within certain predetermined ranges. In another embodiment, the transmission level for a particular frequency is recalibrated when the number of data message received and the received signal level falls within other predetermined ranges. In a further embodiment, two or more sets of optimum frequencies are automatically chosen for different times during the day and the system manager is able to immediately switch between these sets at the appropriate times.
    • 提供了一种用于自动选择从上游向系统管理器发送数据的最佳频率的方法。 系统管理器最初从较大的一组可用频率中选择一组频率,并向每个远程终端下游发送一个指示要使用哪些频率的命令。 每个远程终端响应于系统管理器生成的寻址命令,在每个选定频率上传输数据信息。 系统管理器接收并对每个频率上的数据消息进行计数,并且在接收到统计上显着数量的消息之后,从接收到的数据消息数最少的频率中删除。 该频率被替换为(1)先前未经测试的频率,或者如果已经尝试所有频率,则(2)先前尝试的接收到数据消息数最多的频率。 在优选实施例中,新频率从使用中移除并且仅在接收到的数据消息的数量和特定频率上的接收信号电平落入特定预定范围内时被使用。 在另一个实施例中,当接收到的数据消息的数量和接收的信号电平落入其他预定范围内时,针对特定频率的传输电平被重新校准。 在另一实施例中,在白天的不同时间自动选择两组或更多组最佳频率,并且系统管理员能够在适当的时间立即在这些组之间切换。
    • 10. 发明授权
    • Digital audio data muting system and method
    • 数字音频数据静音系统及方法
    • US5271011A
    • 1993-12-14
    • US852283
    • 1992-03-16
    • Jay C. McMullan, Jr.Lee R. Johnson
    • Jay C. McMullan, Jr.Lee R. Johnson
    • G11B20/18G11B20/24H04L1/20H04N5/926H04N5/945
    • H04N5/945G11B20/1806G11B20/1876G11B20/24H04L1/20H04N5/9265
    • A system and method for disabling the output of a data transmission system when a relatively high error rate is detected in the transmitted signal. The error muting technique of the invention functions as the digital equivalent of a leaky integrator with hysteresis. In particular, the signal quality of the received data transmission is monitored, and a predetermined value is added to an accumulator or error counter when an error is detected. This value varies depending upon the nature of the detected error such that more serious errors are given greater error values. The error counter is also decremented by one or some other amount at a programmable time interval in accordance with the maximum acceptable error rate. The error count (accumulator sum) is continuously compared to a programmable error threshold, and if the threshold is exceeded, the output of the data transmission system is disabled, or in the case of a digital audio transmission system, is muted. Once disabled or muted, the output is not reenabled or unmuted until the error counter is decremented all the way down to a lower limit such as zero. In a particular embodiment of the invention, the error counter is decremented at a different rate when the output of the data transmission system has been disabled or muted so that the system may be more or less rapidly returned to normal operation.
    • 一种在发送信号中检测到较高错误率时禁止数据传输系统的输出的系统和方法。 本发明的误差抑制技术作为具有迟滞的泄漏积分器的数字等效物。 特别地,监视接收到的数据传输的信号质量,并且当检测到错误时,将预定值添加到累加器或错误计数器。 该值根据检测到的错误的性质而变化,使得更严重的错误被给予更大的误差值。 错误计数器还根据最大可接受的错误率以可编程的时间间隔递减一个或其他量。 误差计数(累加器和)与可编程误差阈值连续比较,如果超过阈值,数据传输系统的输出被禁止,或者在数字音频传输系统的情况下被静音。 一旦禁用或静音,输出不会重新启用或取消静音,直到错误计数器一直下降到下限为止。 在本发明的特定实施例中,当数据传输系统的输出被禁用或静音时,错误计数器以不同的速率递减,使得系统可能或多或少地快速地恢复到正常操作。