Systems and methods for gathering research data
Methods and systems are provided for gathering research data that includes information pertaining to audio signals received on a portable device, such as a cell phone. Frequency domain data is received or produced, a signature is extracted from the frequency domain data and an ancillary code is read from the frequency domain data.
1. A method to monitor presentation of media, the method comprising:
determining, with a processor, first frequency-domain data from time-domain audio data corresponding to the media, the first frequency-domain data including first frequency band values associated with respective first frequency bands;
combining, with the processor, respective ones of the first frequency band values associated with contiguous groups of the first frequency bands to determine second frequency-domain data including second frequency band values associated with respective second frequency bands;
processing, with the processor, the first frequency-domain data to obtain a code included in an audio portion of the media; and
processing, with the processor, the second frequency-domain data to obtain a signature representative of the audio portion of the media.
2. The method as defined in claim 1 , wherein the second frequency bands are wider than the first frequency bands.
3. The method as defined in claim 1 , wherein the combining of the respective ones of the first frequency band values to determine the second frequency-domain data includes adding the respective ones of the first frequency band values associated with the contiguous groups of the first frequency bands to determine the second frequency-domain data.
4. The method as defined in claim 1 , wherein the combining of the respective ones of the first frequency band values to determine the second frequency-domain data includes combining the respective first frequency band values associated with a first contiguous group of the first frequency bands to determine a first one of the second frequency band values associated with a first one of the second frequency bands.
5. The method as defined in claim 4 , wherein the first one of the second frequency bands includes the first contiguous group of the first frequency bands, and the first one of the second frequency band values corresponds to an energy level of the first contiguous group of the first frequency bands.
6. The method as defined in claim 1 , wherein the processing of the second frequency-domain data to obtain the signature includes:
determining energy slopes associated with respective ones of the second frequency bands; and
determining the signature based on the respective energy slopes determined for the second frequency bands.
7. The method as defined in claim 1 , wherein the determining of the first frequency-domain data includes performing a fast Fourier transform on the time-domain audio data to determine the first frequency-domain data.
8. A tangible machine readable storage device or storage disk comprising machine readable instructions which, when executed, cause a machine to at least:
determine first frequency-domain data from time-domain audio data corresponding to a presentation of media, the first frequency-domain data including first frequency band values associated with respective first frequency bands;
combine respective ones of the first frequency band values associated with contiguous groups of the first frequency bands to determine second frequency-domain data including second frequency band values associated with respective second frequency bands;
process the first frequency-domain data to obtain a code included in an audio portion of the media; and
process the second frequency-domain data to obtain a signature representative of the audio portion of the media.
9. The storage device or storage disk as defined in claim 8 , wherein the second frequency bands are wider than the first frequency bands.
10. The storage device or storage disk as defined in claim 8 , wherein the instructions cause the machine to combine the respective ones of the first frequency band values by adding the respective ones of the first frequency band values associated with the contiguous groups of the first frequency bands to determine the second frequency-domain data.
11. The storage device or storage disk as defined in claim 8 , wherein the instructions cause the machine to combine the respective ones of the first frequency band values by combining the respective first frequency band values associated with a first contiguous group of the first frequency bands to determine a first one of the second frequency band values associated with a first one of the second frequency bands.
12. The storage device or storage disk as defined in claim 11 , wherein the first one of the second frequency bands includes the first contiguous group of the first frequency bands, and the first one of the second frequency band values corresponds to an energy level of the first contiguous group of the first frequency bands.
13. The storage device or storage disk as defined in claim 8 , wherein the instructions further cause the machine to process the second frequency-domain data to obtain the signature by:
determining energy slopes associated with respective ones of the second frequency bands; and
determining the signature based on the respective energy slopes determined for the second frequency bands.
14. The storage device or storage disk as defined in claim 8 , wherein the instructions cause the machine to determine the first frequency-domain data by performing a fast Fourier transform on the time-domain audio data to determine the first frequency-domain data.
15. An apparatus comprising:
a processor to:
determine first frequency-domain data from time-domain audio data corresponding to a presentation of media, the first frequency-domain data including first frequency band values associated with respective first frequency bands;
combine respective ones of the first frequency band values associated with contiguous groups of the first frequency bands to determine second frequency-domain data including second frequency band values associated with respective second frequency bands;
process the first frequency-domain data to obtain a code included in an audio portion of the media; and
process the second frequency-domain data to obtain a signature representative of the audio portion of the media; and
a memory to store the code and the signature.
16. The apparatus as defined in claim 15 , wherein the second frequency bands are wider than the first frequency bands.
17. The apparatus as defined in claim 15 , wherein the processor is further to combine the respective ones of the first frequency band values by adding the respective ones of the first frequency band values associated with the contiguous groups of the first frequency bands to determine the second frequency-domain data.
18. The apparatus as defined in claim 15 , wherein the processor is further to combine the respective ones of the first frequency band values by combining the respective first frequency band values associated with a first contiguous group of the first frequency bands to determine a first one of the second frequency band values associated with a first one of the second frequency bands.
19. The apparatus as defined in claim 18 , wherein the first one of the second frequency bands includes the first contiguous group of the first frequency bands, and the first one of the second frequency band values corresponds to an energy level of the first contiguous group of the first frequency bands.
20. The apparatus as defined in claim 15 , wherein the processor is further to determine the first frequency-domain data by performing a fast Fourier transform on the time-domain audio data to determine the first frequency-domain data, and the processor is further to process the second frequency-domain data to obtain the signature by:
determining energy slopes associated with respective ones of the second frequency bands; and
determining the signature based on the respective energy slopes determined for the second frequency bands.