DETECTION OF THE PRESENCE OF TELEVISION SIGNALS EMBEDDED IN NOISE USING CYCLOSTATIONARY TOOLBOX

• US 20100157066A1
• Filed: 01/16/2007
• Published: 06/24/2010
• Est. Priority Date: 01/17/2006
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Dong, Bin, Birru, Dagnachew, Challapali, Kiran
• Granted Patent: US 9,654,673 B2
• Time in Patent Office: Days
• US Class Current: 348/180
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/42607 for processing the incoming bitstream
• CPC Class Codes: H04N 5/08 Separation of synchronising signals from picture signals
• CPC Class Codes: H04N 5/21 Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
• CPC Class Codes: H04N 5/46 for receiving on more than one standard at will deflecting circuits of multi-standard receivers H04N3/27

Abstract

A method for detecting the presence of a television signal embedded in a received signal including the television signal and noise is disclosed. Either first-order or second order cyclostationary property of the signals may be used for their detection. When the first-order cyclostationary property is used, the following method is used, the method comprising the steps of upsampling the received signal by a factor of N, performing a synchronous averaging of a set of M segments of the upsampled received signal, performing an autocorrelation of the signal; and detecting the presence of peaks in the output of the autocorrelation function. When the second order cyclostationary property of the signal is used, the method comprising the steps of delaying the received signal by a fixed delay (symbol time), multiplying the received signal with the delayed version, looking for a tone (single frequency) in the output.

Claims

1. A method for detecting the presence of a television signal, exhibiting cyclostationary properties, embedded in a received signal including the television signal and noise, the method comprising the steps of:

determining a peak energy of the received television signal; and

determining the television signal periodicity based on the determined peak energy.

2. The method as recited in claim 1, wherein the step of determining the peak energy comprises the steps of:

upsampling the received signal by a factor of N;

performing a synchronous averaging of a set of M segments of the upsampled received signal;

performing an autocorrelation of the signal; and

detecting the presence of peaks in the output of the autocorrelation function.

3. The method as recited in claim 2, wherein the value of N is at least one magnitude greater than the sampling rate of the TV signal, and a search is conducted over B adjacent frequency bins.

4. The method as recited in claim 1, wherein the step of determining the peak energy comprises the steps of:

a. upsample the desired signal by a factor of N;

b. performing delay-multiplier of the signal;

c. performing a tone analysis; and

d. detecting a single signal in the output of the tone analysis.

5. The method as recited in claim 4, wherein the value of N is at least one magnitude greater than the sampling rate of the TV signal, and a search is conducted over B adjacent frequency bins.

6. A device for detecting the presence of a television signal, exhibiting cyclostationary properties, embedded in a received signal including the television signal and noise, the device comprising:

a processor in communication with a memory, the processor executing the steps of;

determining a peak energy of the received television signal; and

determining the television signal periodicity based on the determined peak energy.

7. The device as recited in claim 6, wherein the step of determining the peak energy comprises the steps of:

upsampling the received signal by a factor of N;

performing a synchronous averaging of a set of M segments of the upsampled received signal;

performing an autocorrelation of the signal; and

detecting the presence of peaks in the output of the autocorrelation function.

8. The device as recited in claim 7, wherein the value of N is at least one magnitude greater than the sampling rate of the TV signal, and a search is conducted over B adjacent frequency bins.

9. The device as recited in claim 6, wherein the step of determining the peak energy comprises the steps of:

a. upsample the desired signal by a factor of N;

b. performing delay-multiplier of the signal;

c. performing a tone analysis; and

d. detecting a single signal in the output of the tone analysis.

10. The device as recited in claim 9, wherein the value of N is at least one magnitude greater than the sampling rate of the TV signal, and a search is conducted over B adjacent frequency bins.

11. A computer readable medium providing instructions to processing system for detecting the presence of a television signal, exhibiting cyclostationary properties, embedded in a received signal including the television signal and noise, the instructions causing the processing system to execute the steps of:

determining a peak energy of the received television signal; and

determining the television signal periodicity based on the determined peak energy.

12. The computer readable medium as recited in claim 11, wherein the step of determining the peak energy comprises the steps of:

upsampling the received signal by a factor of N;

performing a synchronous averaging of a set of M segments of the upsampled received signal;

performing an autocorrelation of the signal; and

detecting the presence of peaks in the output of the autocorrelation function.

13. The computer readable medium as recited in claim 12, wherein the value of N is at least one magnitude greater than the sampling rate of the TV signal, and a search is conducted over B adjacent frequency bins.

14. The computer-readable medium as recited in claim 11, wherein the step of determining the peak energy comprises the steps of:

a. upsample the desired signal by a factor of N;

b. performing delay-multiplier of the signal;

c. performing a tone analysis; and

d. detecting a single signal in the output of the tone analysis.

15. The computer readable medium as recited in claim 14, wherein the value of N is at least one magnitude greater than the sampling rate of the TV signal, and a search is conducted over B adjacent frequency bins.