Methods and Devices to Use Two Different Clocks in a Television Digital Encoder
First Claim
1. An encoding device capable of using two clock frequencies to encode digital video data, the device comprising:
- an input clock operating at a clock frequency other than 27 MHz;
a phase-locked loop (PLL) configured to generate a 27 MHz clock from the input clock;
a re-sampling module to convert luminance and chrominance data representing the digital video data from a 27 MHz clock domain to a clock domain of the input clock;
a color subcarrier generator driven by the input clock to generate color subcarrier signals, the chrominance data from the re-sampling module are modulated by the color subcarrier signals, wherein modulated chrominance data are eventually combined with the luminance data from the re-sampling module; and
a digital to analog converter (DAC) to convert the modulated chrominance data, which are eventually combined with the luminance data from the re-sampling module, into analog signals.
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Abstract
The present invention provides a method and a device that use two different clock frequencies to encode video. The method and device would allow videos taken by an electronic device with input clock frequency other than 27 MHz, to be encoded by using two clock frequencies for playing back on TV. An exemplary method capable of using two clock frequencies to encode digital video data captured by a video-capturing device is provided. The method includes re-sampling luminance and chrominance data in a re-sampling module to convert the luminance and the chrominance data in a 27 MHz clock domain to be in an input clock domain other than 27 MHz of an input clock of the video-capturing device. The method also includes modulating re-sampled chrominance data in the input clock domain by color subcarrier signals driven by the input clock. The method further includes combining the modulated re-sampled chrominance data and the re-sampled luminance data, and converting the combined modulated re-sampled chrominance data and re-sampled luminance data into analog signals.
41 Citations
21 Claims
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1. An encoding device capable of using two clock frequencies to encode digital video data, the device comprising:
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an input clock operating at a clock frequency other than 27 MHz; a phase-locked loop (PLL) configured to generate a 27 MHz clock from the input clock; a re-sampling module to convert luminance and chrominance data representing the digital video data from a 27 MHz clock domain to a clock domain of the input clock; a color subcarrier generator driven by the input clock to generate color subcarrier signals, the chrominance data from the re-sampling module are modulated by the color subcarrier signals, wherein modulated chrominance data are eventually combined with the luminance data from the re-sampling module; and a digital to analog converter (DAC) to convert the modulated chrominance data, which are eventually combined with the luminance data from the re-sampling module, into analog signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method capable of using two clock frequencies to encode digital video data captured by a video-capturing device, the method comprising:
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re-sampling luminance and chrominance data in a re-sampling module to convert the luminance and the chrominance data in a 27 MHz clock domain to be in an input clock domain other than 27 MHz of an input clock of the video-capturing device; modulating re-sampled chrominance data in the input clock domain by color subcarrier signals driven by the input clock; combining the modulated re-sampled chrominance data and the re-sampled luminance data; and converting the combined modulated re-sampled chrominance data and re-sampled luminance data into analog signals. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification