| 摘要 |
<p>A transmission spectrum historically associated with analog broadcast signals is leveraged for digital transmission to provide broadcast channels (352) and user-requested channels to a specific geographic region (250). In addition to broadcast data such as television programming, digital newspapers, and movie channels, back-channels (382) are used to provide interactive and bi-directional communications necessary for on-demand content, internet access, video games, telephone services, and the like. The back-channels may be transmitted via wireless, telephone modem, DSL, or other means. The broadcast license (510) associated with the present invention may be a commercial broadcast license, a public service license, a low power license, or the like. To increase the quantity of services, directional transmission and reception (260) of both user-requested channels and back-channels may be used along with multiple transmission towers (240) to support those channels.</p> |
