Method and apparatus for reducing and restoring the effectiveness of a commercial skip system
A method and apparatus is disclosed which reduces or removes the effectiveness of commercial skip systems such as presently found in VCRs, PVRs, etc. which are designed to delete commercials from signal material upon playback of a previously recorded version of the signal material. In an embodiment, the effectiveness of the commercial skip system is reduced or removed by adding a flat field of selected signal level to active line portions of video lines of the signal material. Other embodiments modify the normal fade to black signal indicative of a commercial to provide a fade to non-black signal. In further embodiments, a fade to non-black signal is inserted in an overscan area of the signal picture. Still further embodiments modify audio signals or selected signals in the horizontal blanking interval which may be used in commercial skip systems to detect the presence of commercials.
1. A method for processing a media signal to defeat a commercial-skip system, the method comprising:
receiving a media signal;
retrieving a threshold value used to detect a commercial in the media signal, wherein the commercial is detected if an indicator value of the media signal is less than the threshold value;
identifying, based on the retrieved threshold value, a portion of the media signal associated with the commercial; and
in response to identifying the portion of the media signal associated with the commercial:
modifying a first plurality of brightness values of the media signal using a first function; and
modifying a second plurality of brightness values of the portion of the media signal using the first modifying function and a second modifying function, wherein each of the modified second plurality of brightness values has a modified brightness value above the threshold value.
2. The method of claim 1 , wherein the identifying further comprises:
comparing the indicator value of the media signal to the threshold value;
determining, based on the comparing, the indicator value of the media signal to be less than the threshold value; and
determining that the media signal is associated with the commercial in response to determining the indicator value of the media signal to be less than the threshold value.
3. The method of claim 1 , wherein the first plurality of brightness values of the media signal corresponds to the portion of the media signal associated with the commercial, and a portion of the media signal not associated with the commercial.
4. The method of claim 1 , wherein the second plurality of brightness values of the media signal corresponds only to brightness values of the portion of the media signal associated with the commercial.
5. The method of claim 1 , wherein modifying the first plurality of brightness values of the portion of the media signal using the first function further comprises adding a boost signal to the media signal.
6. The method of claim 1 , wherein modifying the second plurality of brightness values of the portion of the media signal using the first modifying function and the second modifying function further comprises adding a boost signal and a modifying signal to the portion of the media signal.
7. The method of claim 1 , wherein the first and second function result in at least one of a change in a frequency response of the media signal, a non-linear transfer function applied to the media signal, or a linear transfer function applied to the media signal.
8. The method of claim 1 , further comprising modifying the threshold value based on the media signal.
9. The method of claim 1 , wherein the media signal is a video signal.
10. The method of claim 1 , wherein the portion of the media signal is a first portion of the media signal, and further comprising:
identifying a second portion of the media signal that will not be generated for display; and
modifying a third plurality of brightness values of the second portion of the media signal using a third modifying function, wherein each of the modified third plurality of brightness values has a modified brightness value below the threshold value.
11. A system for processing a media signal to defeat a commercial-skip system, the system comprising control circuitry configured to:
receive a media signal;
retrieve a threshold value used to detect a commercial in the media signal, wherein the commercial is detected if an indicator value of the media signal is less than the threshold value;
identify, based on the retrieved threshold value, a portion of the media signal associated with the commercial; and
in response to identifying the portion of the media signal associated with the commercial:
modify a first plurality of brightness values of the media signal using a first function; and
modify a second plurality of brightness values of the portion of the media signal using the first modifying function and a second modifying function, wherein each of the modified second plurality of brightness values has a modified brightness value above the threshold value.
12. The system of claim 11 , wherein the control circuitry configured to identify is further configured to:
compare the indicator value of the media signal to the threshold value;
determine, based on the comparing, the indicator value of the media signal to be less than the threshold value; and
determine that the media signal is associated with the commercial in response to determining the indicator value of the media signal to be less than the threshold value.
13. The system of claim 11 , wherein the first plurality of brightness values of the media signal corresponds to the portion of the media signal associated with the commercial, and a portion of the media signal not associated with the commercial.
14. The system of claim 11 , wherein the second plurality of brightness values of the media signal corresponds only to brightness values of the portion of the media signal associated with the commercial.
15. The system of claim 11 , wherein the control circuitry configured to modify the first plurality of brightness values of the portion of the media signal using the first function is further configured to add a boost signal to the media signal.
16. The system of claim 11 , wherein the control circuitry configured to modify the second plurality of brightness values of the portion of the media signal using the first modifying function and the second modifying function is further configured to add a boost signal and a modifying signal to the portion of the media signal.
17. The system of claim 11 , wherein the first and second function result in at least one of a change in a frequency response of the media signal, a non-linear transfer function applied to the media signal, or a linear transfer function applied to the media signal.
18. The system of claim 11 , wherein the control circuitry is further configured to modify the threshold value based on the media signal.
19. The system of claim 11 , wherein the media signal is a video signal.
20. The system of claim 11 , wherein the portion of the media signal is a first portion of the media signal, and wherein the control circuitry is further configured to:
identify a second portion of the media signal that will not be generated for display; and
modify a third plurality of brightness values of the second portion of the media signal using a third modifying function, wherein each of the modified third plurality of brightness values has a modified brightness value below the threshold value.