Method and data processing device for processing digital data of a signal
View Patent ↗The invention relates to a method for processing of a signal (s), wherein desired data (d(f(N))) are received via a desired channel (N) of a plurality of frequency channels (N−2, N−1, N, N+1, N+2) and unwanted data (d(f(N−2)), d(f(N−1)), d(f(N+1)), d(f(N+2))) can be received on a neighboring channel (N−2, N−1, N+1, N+2) and wherein the signal (s) is sampled with a sampling frequency (fa) to avoid aliasing of the desired channel (N) in order to create digital data (d o ), wherein the sampling frequency (fa=2f(N−1, N, N+1)) is set high enough for aliasing-free sampling of the desired channel (N) and at least one of the neighboring channels (N−1, N+1).
1. A method performed in a television receiver for processing an input signal that includes desired data received via a desired channel of a plurality of frequency channels and unwanted received on a neighboring channel, the method performed in the television receiver comprising:
sampling the input signal with an adjustable sampling frequency wherein the sampling frequency is between two to six times the channel bandwidth of the desired channel to provide digital data;
band-pass filtering the digital data with a band-pass filter having a pass-band corresponding to the channel width of the desired channel to provide a band-pass filtered signal; and
demodulating the band-pass filtered signal;
wherein the adjustable sampling frequency is set to filter unwanted data prior to demodulation of the desired data in the digital domain with a high-attenuation digital band-pass filter;
wherein the adjustable sampling frequency is set high enough for aliasing-free sampling of the data of the desired channel and the data of the higher-frequency neighboring channel; and
wherein the sampling frequency is set high enough for aliasing-free sampling of the desired channel and several higher-frequency neighboring channels especially at least two such channels.
2. The method of claim 1 , wherein the input signal is received via a radio interface.
3. A method performed in a television receiver for processing an input that includes desired data received via a desired channel of a plurality of frequency channels and unwanted data received on a neighboring channel, the method performed in the television receiver comprising:
sampling the input signal with an adjustable sampling frequency wherein the sampling frequency is between two to six times the channel bandwidth of the desired channel to provide digital data;
band-pass filtering the digital data with a band-pass filter having a pass-band corresponding to the channel width of the desired channel to provide a band-pass filtered signal;
demodulating the band-pass filtered signal;
wherein the adjustable sampling frequency is set to filter unwanted data prior to demodulation of the desired data in the digital domain with a high-attenuation digital band-pass filter;
wherein the digital data are filtered to reduce the unwanted data in order to provide filtered digital data with the desired data; and
wherein the adjustable sampling frequency is set high enough for aliasing-free sampling of the data of the desired channel and the data of the higher-frequency neighboring channel;
wherein the sampling frequency is set high enough for aliasing-free sampling of the desired channel and several higher-frequency neighboring channels especially at least two such channels.
4. The method of claim 3 , wherein the sampling frequency of the signal(s) is set at more than twice the channel bandwidth of the desired channel for aliasing-free sampling.
5. The method of claim 3 , wherein a direct sampling scenario is used for processing the signal (s) or the data.
6. The method of claim 3 , wherein an undersampled scenario is used for processing the signal (s) or the data.
7. A data processing device that receives an analog input signal wherein desired data are received on a desired channel of a plurality of frequency channels and unwanted data can be received on a neighboring, the device comprising:
a sampling device for sampling the analog input signal to generate digital data with a adjustable sampling frequency avoiding aliasing of the desired channel, wherein the sampling device is operated with the adjustable sampling frequency between two to six times the channel bandwidth of the desired channel to provide digital data;
a high-attenuation digital band-pass filter having a pass-band that corresponds to the channel width of the desired channel, that is responsive to the digital data and provides a band-pass filtered signal;
wherein the adjustable sampling frequency is set to filter unwanted data prior to demodulation of the desired data in the digital domain with the high-attenuation digital band-pass filter; and
means for processing and demodulating said band-pass filtered digital data to recover data within the desired channel;
wherein the sampling device is operated with the sampling frequency set for the aliasing-free sampling of the desired channel and at least one higher-frequency neighboring channel.
8. A method performed in a television receiver of processing an analog input signal, the method formed in the television receiver comprising:
receiving the analog input signal and preprocessing the analog input signal to provide an analog preprocessed signal;
sampling the analog preprocessed signal using an adjustable sampling frequency to provide a digitized signal wherein the adjustable sampling frequency is set to filter unwanted data prior to demodulation of the desired data in the digital domain with a high-attenuation digital band-pass filter;
band-pass filtering the digitized signal with a high-attenuation digital band-pass filter having a pass-band corresponding to the channel width of the desired channel-to provide a band-pass filtered signal wherein the adjustable sampling frequency is set to filter unwanted data prior to demodulation of the desired data in the digital domain set for the aliasing-free sampling of the desired channel and at least one higher-frequency neighboring channel; and
demodulating the band-pass filtered signal;
wherein the filtered-digitized signal comprises a plurality of frequency channels.
9. The method of claim 8 , wherein the sampling frequency of the signal(s) is set at more than twice the channel bandwidth of the desired channel for aliasing-free sampling.
10. The method of claim 9 , wherein a direct sampling scenario is used for processing the signal (s) or the data.
11. The method of claim 9 , wherein an undersampled scenario is used for processing the signal (s) or the data.