Patent Application
20110085088
The present invention relates generally to a system and method for channel mapping and, more specifically, to avoiding inefficiencies associated with channel map features for digital-ready televisions.
This section is intended to introduce the reader to various aspects of art, which may be related to various aspects of embodiments of the present invention that are described and/or claimed below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of embodiments of the present invention. Accordingly, it should be understood that these statements are to be read in this light, and not as admissions of prior art.
Digital television, a service offered by many cable distributors, utilizes digital technology to facilitate provision of a larger number of channels to users than would be available with analog channels alone. Using video compression and digital channels, cable distributors may increase the number and diversity of programs available on their existing cable networks without requiring network additions. In view of the number of channels available from both digital and analog sources, it may be desirable or necessary to store a channel map to facilitate navigation through available broadcasts. A channel map may be defined as a list of channels present in a given cable or antenna lineup.
It is often more cost effective to produce a digital-ready television that receives both digital and analog signals by using a non-integrated tuning solution. In other words, it is often desirable to use a digital component for accessing digital channels and a separate analog component for accessing analog channels. This can be the case for a number of reasons. For example, analog components are generally cheaper than digital components and the cost of integrating the two is generally considered a prohibitive development cost. However, while utilizing an analog component to access analog channels and a digital component to access digital channels can be more cost effective, performance can be negatively impacted. For example, when a channel map is being created by performing a channel search to identify available channels, there may be some inefficiency based on underutilized overlap between digital and analog channel maps.
Advantages of the invention may become apparent upon reading the following detailed description and upon reference to the drawings in which:
One or more specific embodiments of the present invention will be described below. In an effort to provide a concise description of these embodiments, not all features of an actual implementation are described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
Embodiments of the present invention are directed to reducing the time required to establish a channel map including both analog and digital channels. More specifically, embodiments of the present invention are directed to providing an efficient system that utilizes a non-integrated solution. This is achieved by establishing the type of channel to be mapped first and by sharing data between the separate analog and digital components of the non-integrated solution.
By performing the analog channel search (block 202) prior to the digital channel search (block 208), the overall time required for a channel search in the non-integrated solution is reduced compared to traditional techniques and systems involving non-integrated solutions. Indeed, traditional techniques require a digital channel search on all channels. This can require a significant amount of time. Since the search for a signal on a digital channel requires more time than on an analog channel, embodiments of the present invention, which prevent the digital channel search from spending time on analog channels that have already been found, are more efficient than traditional techniques and systems. For example, present embodiments may be especially efficient in an environment which contains a large number of analog channels, such as a cable provider input.
The channels searched in accordance with present embodiments may be designated based on a mode of operation. For example, channels 2-69 may be searched in a terrestrial mode, and channels 1-135 may be searched in a cable mode.
The analog channel search represented by block 202 may be performed using the analog component 112 of the tuner 104. For analog channels, the tuner 104 is tuned to a nominal frequency to check for the automatic fine tuning (AFT) component and sync to determine if an analog channel is available. For terrestrial mode, tuning to the nominal frequency is sufficient. For cable mode, additional steps are performed such as a determination of whether an incoming signal employs harmonically related carriers (HRC) or incrementally related carriers (IRC).
The digital channel search represented in block 206, which is performed after the analog channel search in block 202, may be performed using the digital component 114 of the tuner 104. The tuner is tuned to a nominal frequency for the channel. For the digital channel search, a modulation scheme is used to determine valid transport packets. In terrestrial mode, an 8 vestigial side band (8 VSB) modulation scheme may be utilized. For cable mode, an 8 VSB, 64 quadrature amplitude modulation (QAM) or 256 QAM modulation scheme may be utilized. Once a modulation scheme is selected, a link checks for valid transport packets. If no valid transport packets are found, it is determined that there is no digital channel available on the designated frequency. This may be performed on all channels that are not already designated as found analog channels.
Typically, there are more analog channels than digital channels available from a given provider. Accordingly, present embodiments significantly reduce the number of channels over which a digital channel search is performed. In other words, because many channels will already be designated as found analog channels, fewer channels will be searched in the digital channel search. Thus, channel searching will be more efficient. However, as more and more digital channels are made available, this logic can be reversed in accordance with present embodiments such that digital channels are searched first and then analog channels are searched only on the channels that are not found during the digital channel search. For example, a user may select which type of channel search to perform first by designating the analog module 112 or the digital module 114 as a primary module. For example, this may be achieved via a switch or button-activated command disposed on a controller of the device 100 (e.g., the controller 111).
While the invention may be susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and will be described in detail herein. However, it should be understood that the invention is not intended to be limited to the particular forms disclosed. Rather, the invention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the invention as defined by the following appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 200810067696.4 | Jun 2008 | CN | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/US08/81155 | 10/24/2008 | WO | 00 | 11/18/2010 |
