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    Television channel lockout
    1.
    发明授权
    Television channel lockout 失效
    电视频道锁定

    公开(公告)号：US4510623A

    公开(公告)日：1985-04-09

    申请号：US401175

    申请日：1982-07-23

    申请人： Paul Bonneau ,  Howard E. Holshouser ,  Terrence E. Rogers

    发明人： Paul Bonneau ,  Howard E. Holshouser ,  Terrence E. Rogers

    IPC分类号： H03J5/02 ,  H04N7/16 ,  H04B1/16 ,  H04N5/44

    CPC分类号： H03J5/0281 ,  H04N7/162

    摘要： An electronically tuned television receiver is provided with a channel lockout feature to control viewer program selection. The television receiver has a tuner local oscillator (101), the frequency of which is controlled by a phase lock loop (12) having a programmable frequency divider (122,123). A microprocessor receives a user input from a keyboard (14) or remote transmitter (15) indicating a desired channel. In response to this input, the microprocessor normally loads a programmable constant in the programmable frequency divider to cause the tuner (10) to be tuned to the desired channel. However, the microprocessor is programmed to respond to a user entered lockout code sequence to store in a non-volatile memory (19) one or more channels to be inhibited for a predetermined period of time. Should a user input indicate one of the inhibited channels, the microprocessor does not load the corresponding programmable constant in the programmable frequency divider with the result that the television receiver continues to receive the last valid channel selected. Once the predetermined period of time has elapsed, the non-volatile memory is cleared of the inhibited channels, and the television receiver reverts to normal tuning operation for all channels. The microprocessor is further programmed to respond to a security code to permit viewing of an inhibited channel during the time that channel is locked out. In addition, the microprocessor is programmed to respond to a master key code to permit clearing of all inhibited channels stored in the non-volatile memory.

    摘要翻译： 电子调谐的电视接收机具有通道锁定功能以控制观众节目选择。 电视接收机具有调谐器本地振荡器（101），其频率由具有可编程分频器（122,123）的锁相环（12）控制。 微处理器从指示所需通道的键盘（14）或远程发射器（15）接收用户输入。 响应于该输入，微处理器通常在可编程分频器中加载可编程常数，以使调谐器（10）被调谐到期望的通道。 然而，微处理器被编程为响应于用户输入的锁定代码序列，以在一个非易失性存储器（19）中存储一个或多个要被禁止预定时间段的通道。 如果用户输入指示被禁止的通道中的一个，则微处理器不将可编程分频器中的对应的可编程常数加载，结果是电视接收机继续接收所选择的最后一个有效信道。 一旦预定时间段过去，非易失性存储器被清除禁止的信道，并且电视接收机恢复到所有信道的正常调谐操作。 微处理器被进一步编程为响应安全码，以允许在信道被锁定的时间期间观看被禁止的信道。 此外，微处理器被编程为响应主密钥代码以允许清除存储在非易失性存储器中的所有禁止的信道。