Systems and methods for gathering research data
View Patent ↗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 for obtaining information from an audio signal in a portable device, the method comprising:
receiving time domain audio data from the audio signal;
converting a portion of the time domain audio data to frequency domain data in the portable device, wherein the frequency domain data comprises a plurality of frequency bands of different sizes; and
processing the frequency domain data according to frequency band size to read an ancillary code and extract a signature from the converted portion.
2. The method of claim 1 , wherein the portable device is one of a cell phone, a media player and a computing device.
3. The method according to claim 1 , wherein the plurality of frequency bands comprise a first plurality of frequency bands and a second plurality of frequency bands, the second plurality of frequency bands being wider than the first plurality of frequency bands.
4. The method according to claim 1 , wherein the converting is performed by a time domain-to-frequency domain transformation.
5. The method according to claim 4 , further comprising converting time-displaced segments of the audio data to the frequency domain, wherein the segments substantially overlap in time.
6. The method according to claim 1 , wherein the ancillary code comprises a message comprising code symbols each including a plurality of frequency components, the method further comprising evaluating a signal level for each component of the code symbols in the frequency domain data.
7. The method according to claim 6 , wherein noise is associated with a quotient comprising an associated received energy value of a predetermined frequency band indicating frequency components relative to a noise level associated with frequency bands in proximity to the predetermined frequency band.
8. The method according to claim 6 , wherein data representing evaluations of the signal level for each component of the code symbols is subject to storage using at least one accumulator.
9. The method of claim 8 wherein the storage comprises at least one buffer enabling each of various quotients to be continuously, repeatedly accumulated and sorted according to a predetermined criteria.
10. The method of claim 9 , wherein the predetermined criteria comprise a message length equal to that of the accumulator.
11. A portable device configured to capture information from an audio signal, the portable device comprising:
an input for receiving time domain audio data relating to the audio signal; and
a processor operatively coupled to the input, wherein the processor is configured to convert a portion of the time domain audio data to frequency domain data in the portable device, wherein the frequency domain data comprises a plurality of frequency bands of different sizes, and wherein the processor is configured to process the frequency domain data according to frequency band size to read an ancillary code and extract a signature from the converted portion.
12. The portable device recited in claim 11 , wherein the portable device is one of a cell phone, a media player and a computing device.
13. The portable device recited in claim 12 , wherein the plurality of frequency bands comprise a first plurality of frequency bands and a second plurality of frequency bands, the second plurality of frequency bands being wider than the first plurality of frequency bands.
14. The portable device recited in claim 11 , wherein the processor converts the time audio data using a time domain-to-frequency domain transformation.
15. The portable device recited in claim 11 , wherein the ancillary code comprises a message comprising code symbols each including a plurality of frequency components, wherein a signal level for each component of the code symbols in the frequency domain data is evaluated by the processor.
16. The portable device recited in claim 15 , wherein the processor associates noise with a quotient comprising an associated received energy value of a predetermined frequency band indicating frequency components relative to a noise level associated with frequency bands in proximity to the predetermined frequency band.
17. The portable device recited in claim 16 , further comprising at least one accumulator, wherein data representing evaluations of the signal level for each component of the code symbols is subject to storage using the at least one accumulator.
18. The portable device recited in claim 17 , further comprising at least one buffer enabling each of various quotients to be continuously, repeatedly accumulated and sorted according to a predetermined criteria.
19. The portable device recited in claim 18 , wherein the predetermined criteria comprise a message length equal to that of the accumulator.
20. A method for obtaining information from an audio signal in a portable device, the method comprising:
receiving time domain audio data relating to the audio signal; and
performing a processing operation on the time domain audio data in the portable device to read an ancillary code and extract a signature within a time period, wherein the processing operation comprises converting the time domain audio data to frequency domain data for the time period, wherein the frequency domain data comprises a plurality of frequency bands of different sizes.