Research data gathering

1. An apparatus to recover a code from media, the apparatus comprising:

memory;

computer readable instructions; and

at least one processor to execute the computer readable instructions to at least:

perform first processing on a received audio signal at a first time when the apparatus is powered by an internal power source, the first processing to determine audio data to store in storage of the apparatus; and

perform second processing on the stored audio data to recover the code at a second time when the apparatus is powered by an external power source, the second time after the first time, the second processing different from the first processing.

2. The apparatus of claim 1 , wherein the at least one processor is further to detect whether the apparatus is powered by the internal power source or the external power source.

3. The apparatus of claim 1 , wherein the first processing includes at least one of noise filtering or compression, and the second processing includes a frequency transformation.

4. The apparatus of claim 1 , wherein to perform the second processing, the at least one processor is to perform multiple code reading processes on the stored audio data to recover the code, the at least one processor to use different process parameters in respective ones of the multiple code reading processes.

5. The apparatus of claim 1 , wherein to perform the second processing, the at least one processor is to:

process the stored audio data based on a first frequency offset;

determine that the code is not recoverable from the stored audio data using a first group of frequency components of the audio data determined based on the first frequency offset;

successively process the stored audio data based on a predetermined pattern of positive and negative frequency offsets to determine a second frequency offset corresponding to a different second group of frequency components of the stored audio data to be used to recover the code; and

recover the code from the stored audio data using the different second group of frequency components of the stored audio data corresponding to the second frequency offset.

6. The apparatus of claim 1 , wherein to perform the second processing, the at least one processor is to:

perform up to a first number of first passes through the stored audio data based on a first window of time to determine whether the code is recoverable from the stored audio data using the first window of time, respective ones of the first passes to process samples of the stored audio data corresponding to the same first window of time, the samples for a first one of the first passes to be offset relative to the samples for a second one of the first passes; and

in response to a determination that the code is not recoverable from the stored audio data using the first window of time, perform up to a second number of second passes through the stored audio data based on a second window of time larger than the first window of time to recover the code from the stored audio data, respective ones of the second passes to process samples of the stored audio data corresponding to the same second window of time, the samples for a first one of the second passes to be offset relative to the samples for a second one of the second passes.

7. The apparatus of claim 1 , further including a microphone to obtain the received audio signal.

8. An article of manufacture comprising computer readable instructions that, when executed, cause at least one processor of a device to at least:

perform first processing on a received audio signal at a first time when the device is powered by an internal power source, the first processing to determine audio data to store in storage of the device; and

perform second processing on the stored audio data to recover a code at a second time when the device is powered by an external power source, the second time after the first time, the second processing different from the first processing.

9. The article of manufacture of claim 8 , wherein the instructions cause the at least one processor to detect whether the device is powered by the internal power source or the external power source.

10. The article of manufacture of claim 8 , wherein the first processing includes at least one of noise filtering or compression, and the second processing includes a frequency transformation.

11. The article of manufacture of claim 8 , wherein to perform the second processing, the instructions cause the at least one processor to perform multiple code reading processes on the stored audio data to recover the code, the instructions to cause the at least one processor to use different process parameters in respective ones of the multiple code reading processes.

12. The article of manufacture of claim 8 , wherein to perform the second processing, the instructions cause the at least one processor to:

process the stored audio data based on a first frequency offset;

determine that the code is not recoverable from the stored audio data using a first group of frequency components of the audio data determined based on the first frequency offset;

successively process the stored audio data based on a predetermined pattern of positive and negative frequency offsets to determine a second frequency offset corresponding to a different second group of frequency components of the stored audio data to be used to recover the code; and

recover the code from the stored audio data using the different second group of frequency components of the stored audio data corresponding to the second frequency offset.

13. The article of manufacture of claim 8 , wherein to perform the second processing, the instructions cause the at least one processor to:

perform up to a first number of first passes through the stored audio data based on a first window of time to determine whether the code is recoverable from the stored audio data using the first window of time, respective ones of the first passes to process samples of the stored audio data corresponding to the same first window of time, the samples for a first one of the first passes to be offset relative to the samples for a second one of the first passes; and

in response to a determination that the code is not recoverable from the stored audio data using the first window of time, perform up to a second number of second passes through the stored audio data based on a second window of time larger than the first window of time to recover the code from the stored audio data, respective ones of the second passes to process samples of the stored audio data corresponding to the same second window of time, the samples for a first one of the second passes to be offset relative to the samples for a second one of the second passes.

14. A method to recover a code from media, the method comprising:

performing, by executing an instruction with at least one processor of a device, first processing on a received audio signal at a first time when the device is powered by an internal power source, the first processing to determine audio data to store in storage of the device; and

performing, by executing an instruction with the at least one processor, second processing on the stored audio data to recover the code at a second time when the device is powered by an external power source, the second time after the first time, the second processing different from the first processing.

15. The method of claim 14 , further including detecting whether the device is powered by the internal power source or the external power source.

16. The method of claim 14 , wherein the first processing includes at least one of noise filtering or compression, and the second processing includes a frequency transformation.

17. The method of claim 14 , wherein the performing of the second processing includes performing multiple code reading processes on the stored audio data to recover the code, the processor to use different process parameters in respective ones of the multiple code reading processes.

18. The method of claim 14 , wherein the performing of the second processing includes:

processing the stored audio data based on a first frequency offset;

determining that the code is not recoverable from the stored audio data using a first group of frequency components of the audio data determined based on the first frequency offset;

successively processing the stored audio data based on a predetermined pattern of positive and negative frequency offsets to determine a second frequency offset corresponding to a different second group of frequency components of the stored audio data to be used to recover the code; and

recovering the code from the stored audio data using the different second group of frequency components of the stored audio data corresponding to the second frequency offset.

19. The method of claim 14 , wherein the performing of the second processing includes:

performing up to a first number of first passes through the stored audio data based on a first window of time to determine whether the code is recoverable from the stored audio data using the first window of time, respective ones of the first passes to process samples of the stored audio data corresponding to the same first window of time, the samples for a first one of the first passes to be offset relative to the samples for a second one of the first passes; and

in response to a determination that the code is not recoverable from the stored audio data using the first window of time, performing up to a second number of second passes through the stored audio data based on a second window of time larger than the first window of time to recover the code from the stored audio data, respective ones of the second passes to process samples of the stored audio data corresponding to the same second window of time, the samples for a first one of the second passes to be offset relative to the samples for a second one of the second passes.

20. The method of claim 14 , further including obtaining the received audio signal with a microphone of the device.