System and method for concurrently demodulating and decoding multiple data streams
First Claim
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1. An apparatus for convolving digital samples from a plurality of concurrently received cable or satellite multimedia signal carriers comprising:
- a fast Fourier transform (“
FFT”
) module to transform a plurality of time-based digital samples from each of said concurrent signal carriers into a plurality of frequency coefficients;
a multiplier to multiply said plurality of frequency coefficients by a plurality of filter coefficients to produce filtered coefficients in the frequency domain; and
an inverse fast Fourier transform (“
IFFT”
) module to convert said filtered coefficients from the frequency domain into the time domain to produce convolved, time-based digital samples for each of said signal carriers.
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Abstract
An architecture and method are disclosed for concurrently processing multimedia data from several satellite transponders or satellite carriers. In one embodiment, a combination of a fast Fourier transform, a complex multiplication, and an inverse fast Fourier transform are performed on a group of transponders/carriers to filter the underlying multimedia content, to decimate the signals and to correct for gain and phase imbalances.
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Citations
58 Claims
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1. An apparatus for convolving digital samples from a plurality of concurrently received cable or satellite multimedia signal carriers comprising:
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a fast Fourier transform (“
FFT”
) module to transform a plurality of time-based digital samples from each of said concurrent signal carriers into a plurality of frequency coefficients;a multiplier to multiply said plurality of frequency coefficients by a plurality of filter coefficients to produce filtered coefficients in the frequency domain; and an inverse fast Fourier transform (“
IFFT”
) module to convert said filtered coefficients from the frequency domain into the time domain to produce convolved, time-based digital samples for each of said signal carriers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. In a system which concurrently processes multimedia data from multiple cable or satellite signal carriers, a method for concurrently convolving said multimedia data comprising:
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performing an N-point fast Fourier transform (“
FFT”
) on time-based multimedia data from a first group of signal carriers to generate a set of frequency coefficients representing said first group of signal carriers in the frequency domain;multiplying said plurality of frequency coefficients by a plurality of filter coefficients to produce filtered coefficients for each multimedia stream in said first group of signal carriers; and performing an M-point inverse fast Fourier transform (“
IFFT”
) module to convert said filtered coefficients from the frequency domain into the time domain to produce a set of convolved, time-based data samples for each multimedia stream in said first group of signal carriers. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A machine-readable medium having code stored thereon which defines an integrated circuit (IC) for convolving digital samples from a plurality of cable or satellite multimedia signal carriers, said IC comprising:
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a fast Fourier transform (“
FFT”
) module to transform a plurality of time-based digital samples from each of said signal carriers into a plurality of frequency coefficients, wherein each of said signal carriers comprises digital samples for a plurality of different multimedia streams;a multiplier to multiply said plurality of frequency coefficients by a plurality of filter coefficients to produce filtered coefficients in the frequency domain; and an inverse fast Fourier transform (“
IFFT”
) module to convert said filtered coefficients from the frequency domain into the time domain to produce convolved, time-based digital samples for each of said signal carriers. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. An apparatus for convolving digital samples from a plurality of cable or satellite multimedia signal carriers comprising:
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a plurality of tuners to lock on to said signal carriers at specified frequencies and down-convert said signal carriers to baseband signals; and a plurality of analog-to-digital (“
A/D”
) converters to generate a plurality of time-based digital samples from each of said baseband signals,a fast Fourier transform (“
FFT”
) module to transform said plurality of time-based digital samples from each of said signal carriers into a plurality of frequency coefficients;a multiplier to multiply said plurality of frequency coefficients by a plurality of filter coefficients to produce filtered coefficients in the frequency domain; and an inverse fast Fourier transform (“
IFFT”
) module to convert said filtered coefficients from the frequency domain into the time domain to produce convolved, time-based digital samples for each of said signal carriers. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
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Specification