EPG-conditioned letterbox-to-anamorphic conversion
View Patent ↗Designed for use with widescreen TVs or high-end TVs with a mode for accommodating anamorphic programs, an EPG client is equipped with an electronic program guide (EPG) and a letterbox-to-anamorphic converter. The EPG client evaluates EPG data to determine whether programs are in the letterbox format. When a letterboxed program is selected for viewing, the EPG client vertically stretches the program by a ratio of M/N, where M>N (e.g., 4/3), to convert the program from the letterbox format to an anamorphic format prior to delivery to the television. The converted anamorphic program is output to the television, where it is horizontally expanded to fit the screen.
1. One or more computer readable media comprising computer-executable instructions that, when executed on a computer, perform a method comprising:
determining, from program data for an electronic program guide, whether a program is in letterbox format; and
upon request for a program determined as being in letterbox format, converting the program to anamorphic format prior to outputting the program to a television.
2. A method as recited in claim 1 , wherein the determining comprises evaluating a format flag associated with the program.
3. A method as recited in claim 1 , wherein the converting comprises vertically stretching the program by a ratio of 4/3.
4. A method as recited in claim 1 , wherein the converting comprises vertically stretching the program by a ratio of M/N, where M>N.
5. A method as recited in claim 1 , wherein the converting comprises using multiple polyphase filters to resample the program.
6. A method as recited in claim 1 , further comprising receiving the program data as part of a broadcast feed.
7. One or more computer readable media comprising computer-executable instructions that, when executed on a client device, perform a method for operating the client device that interfaces a television with a television network, comprising:
ascertaining whether a program is in letterbox format;
determining whether the television is capable of supporting anamorphic programs; and
in an event that the program is in letterbox format and the television is capable of supporting anamorphic programs, converting the program from the letterbox format to anamorphic format prior to output to the television.
8. A method as recited in claim 7 , wherein the ascertaining comprises checking a format field in program data to identify whether the program is marked as being in letterbox format.
9. A method as recited in claim 7 , wherein the determining comprises discerning from user settings whether the television is capable of supporting anamorphic programs.
10. A method as recited in claim 7 , wherein the converting comprises vertically stretching the program by a ratio of 4/3.
11. A method as recited in claim 7 , wherein the converting comprises vertically stretching the program by a ratio of M/N, where M>N.
12. A method as recited in claim 7 , wherein the converting comprises using multiple polyphase filters to resample the program.
13. A method as recited in claim 7 , further comprising receiving the program data as part of a broadcast feed.
14. A computer-readable medium comprising computer-executable instructions that, when executed by a computer, direct a client device to:
evaluate electronic program guide (EPG) data to discern whether a program is in letterbox format; and
in an event that the program is in letterbox format, convert the program from the letterbox format to anamorphic format prior to outputting the program to a television.
15. A computer-readable medium as recited in claim 14 , further comprising computer-executable instructions that, when executed by a computer, direct a client device to vertically stretch the program by a ratio of 4/3.
16. A computer-readable medium as recited in claim 14 , further comprising computer-executable instructions that, when executed by a computer, direct a client device to vertically stretch the program by a ratio of M/N, where M>N.
17. A computer-readable medium comprising computer-executable instructions that, when executed by a computer, direct a client device to:
ascertain whether a program is in letterbox format;
determine whether the television is capable of supporting anamorphic programs; and
in an event that the program is in letterbox format and the television is capable of supporting anamorphic programs, convert the program from the letterbox format to anamorphic format prior to outputting the program to a television.
18. A computer-readable medium as recited in claim 17 , further comprising computer-executable instructions that, when executed by a computer, direct a client device to check a format field in program data to identify whether the program is marked as being in letterbox format.
19. A computer-readable medium as recited in claim 17 , further comprising computer-executable instructions that, when executed by a computer, direct a client device to ascertain from user settings whether the television is capable of supporting anamorphic programs.
20. A computer-readable medium as recited in claim 17 , further comprising computer-executable instructions that, when executed by a computer, direct a client device to vertically stretch the program by a ratio of 4/3.
21. A computer-readable medium as recited in claim 17 , further comprising computer-executable instructions that, when executed by a computer, direct a client device to vertically stretch the program by a ratio of M/N, where M>N.
22. A client device, comprising:
a memory;
a processor coupled to the memory;
an electronic program guide (EPG) stored in the memory and executed on the processor to organize and present program data relating to programs, the program data including information identifying whether programs are in letterbox format; and
a letterbox-to-anamorphic converter to convert a program identified by the EPG to be in letterbox format into an anamorphic program in anamorphic format for output to a television display.
23. A client device as recited in claim 22 , wherein the letterbox-to-anamorphic converter is configured to vertically stretch the program by a ratio of 4/3.
24. A client device as recited in claim 22 , wherein the letterbox-to-anamorphic converter is configured to vertically stretch the program by a ratio of M/N, where M>N.
25. A client device as recited in claim 22 , wherein the letterbox-to-anamorphic converter comprises a resampler to produce M/N times as many output samples from input samples, where M>N.
26. A client device as recited in claim 22 , wherein the letterbox-to-anamorphic converter comprises a polyphase resampler with multiple polyphase filters.
27. A client device as recited in claim 22 , wherein the letterbox-to-anamorphic converter comprises:
a factor-of-M interpolator to produce M times more samples than were input to the converter;
a low pass filter to filter the samples; and
a factor-of-N decimator to reduce the number of samples by a factor of N, thereby producing M/N times as many output samples as were input to the converter.
28. A client device as recited in claim 27 , wherein the low pass filter comprises multiple polyphase filters.
29. A client device, comprising:
a memory;
a processor coupled to the memory, the processor being configured to identify whether a program is in letterbox format and to determine whether a television is capable of supporting an anamorphic format; and
a letterbox-to-anamorphic converter to convert a program identified to be in letterbox format into an anamorphic program in anamorphic format for output to a television display in an event that the television is capable of supporting anamorphic programs.
30. A client device as recited in claim 29 , wherein the letterbox-to-anamorphic converter is configured to vertically stretch the program by a ratio of 4/3.
31. A client device as recited in claim 29 , wherein the letterbox-to-anamorphic converter is configured to vertically stretch the program by a ratio of M/N, where M>N.
32. A client device as recited in claim 29 , wherein the letterbox-to-anamorphic converter comprises a resampler to produce M/N times as many output samples from input samples, where M>N.
33. A client device as recited in claim 29 , wherein the letterbox-to-anamorphic converter comprises a polyphase resampler with multiple polyphase filters.
34. A client device as recited in claim 29 , wherein the letterbox-to-anamorphic converter comprises:
a factor-of-M interpolator to produce M times more samples than were input to the converter;
a low pass filter to filter the samples; and
a factor-of-N decimator to reduce the number of samples by a factor of N, thereby producing M/N times as many output samples as were input to the converter.
35. A client device as recited in claim 34 , wherein the low pass filter comprises multiple polyphase filters.
36. A system for use with a television capable of supporting anamorphic programs, comprising:
program guide means for examining electronic program guide data to ascertain whether a program is in letterbox format; and
in an event that the program is in letterbox format, conversion means for converting the program from the letterbox format to anamorphic format prior to output to the television.
37. A system as recited in claim 36 , wherein the conversion means comprises means for vertically stretching the program by a ratio of 4/3.
38. A system as recited in claim 36 , wherein the conversion means comprises means for vertically stretching the program by a ratio of M/N, where M>N.
39. A system as recited in claim 36 , wherein the conversion means comprises resampling means for resampling the program to produce M/N times more output samples than input samples, where M>N.
40. A system, comprising:
means for ascertaining whether a program is in letterbox format; and
means for determining whether the television is capable of supporting anamorphic programs; and
in an event that the program is in letterbox format and the television is capable of supporting anamorphic programs, conversion means for converting the program from the letterbox format to anamorphic format prior to output to the television.
41. A system as recited in claim 40 , wherein the conversion means comprises means for vertically stretching the program by a ratio of 4/3.
42. A system as recited in claim 40 , wherein the conversion means comprises means for vertically stretching the program by a ratio of M/N, where M>N.
43. A system as recited in claim 40 , wherein the conversion means comprises resampling means for resampling the program to produce M/N times more output samples than input samples, where M>N.