Methods and apparatus to perform audio sensor selection in an audience measurement device
Methods, apparatus, systems and articles of manufacture to perform audio sensor selection in an audience metering device are disclosed. An example apparatus includes at least two audio sensors to receive audio at an audience metering device and a selection tester to identify a plurality of audio sensor configurations supported by the audience metering device, the plurality of audio sensor configurations identifying respective gain values to be applied to the plurality of audio sensors. The selection tester is further to select one of the first one of the audio sensor configurations or the second one of the audio sensor configurations based on a comparison of a first quality metric and a second quality metric. The example apparatus further includes a media identifier to identify audio received at the audience metering device using the selected one of the audio sensor configurations.
1. An apparatus, comprising:
a first audio sensor to output a first signal;
a second audio sensor to output a second signal;
a selection tester to:
identify a first configuration and a second configuration, the first and second configurations to identify respective gain values to be applied to at least one of the first signal and the second signal;
obtain a first quality metric associated with a first media identification when the gain values of the first configuration are applied;
obtain a second quality metric associated with a second media identification when the gain values of the second configuration are applied; and
select one of the first configuration or the second configuration based on a comparison of the first quality metric and the second quality metric; and
a media identifier to identify media based on the first signal and the second signal with the selected one of the configurations applied.
2. The apparatus of claim 1 , further including a configuration memory to store the selected one of the configurations.
3. The apparatus of claim 1 , wherein the selection tester is to select the one of the first configuration or the second configuration when at least one of the first quality metric or the second quality metric satisfies a quality metric change threshold.
4. The apparatus of claim 1 , further including an audio sensor selector to combine audio based on the selected one of the first configuration or the second configuration to form combined audio, the media identifier to perform the identification based on the combined audio.
5. The apparatus of claim 1 , wherein the selection tester is to identify the first configuration and the second configuration periodically.
6. The apparatus of claim 1 , wherein the first quality metric and the second quality metric are signal to noise ratios.
7. The apparatus of claim 1 , wherein the first quality metric and the second quality metric are a combination of signal to noise ratios and bit error rates.
8. A method, the method comprising:
identifying a first configuration and a second configuration, the first and second configurations to identify respective gain values to be applied to at least one of a first signal output by a first audio sensor of an audience metering device and a second signal output by a second audio sensor of the audience metering device;
obtaining a first quality metric associated with a first media identification when the gain values of the first configuration are applied;
obtaining a second quality metric associated with a second media identification when the gain values of the second configuration are applied;
selecting one of the first configuration or the second configuration based on a comparison of the first quality metric and the second quality metric; and
identifying media based on the first signal and the second signal with the selected one of the configurations applied.
9. The method of claim 8 , further including storing the selected one of the configurations in a configuration memory.
10. The method of claim 8 , wherein the selecting of the one of the first configuration or the second configuration is performed when at least one of the first quality metric or the second quality metric satisfies a quality metric change threshold.
11. The method of claim 8 , wherein the identification of the configurations is performed periodically.
12. The method of claim 8 , wherein the first quality metric and the second quality metric are signal to noise ratios.
13. The method of claim 8 , wherein the first quality metric and the second quality metric are a combination of signal to noise ratios and bit error rates.
14. A non-transitory readable medium comprising instructions which, when executed, cause an audience metering device to at least:
identify a first configuration and a second configuration, the first and second configurations to identify respective gain values to be applied to at least one of a first signal output by a first audio sensor of the audience metering device and a second signal output by a second audio sensor of the audience metering device;
obtain a first quality metric associated with a first media identification when the gain values of the first configuration are applied;
obtain a second quality metric associated with a second media identification when the gain values of the second audio sensor configuration are applied;
select one of the first configuration or the second configuration based on a comparison of the first quality metric and the second quality metric; and
identify media based on the first signal and the second signal with the selected one of the configurations applied.
15. The non-transitory readable medium of claim 14 , wherein the instructions, when executed, further cause the audience metering device to store the selected one of the configurations in a configuration memory.
16. The non-transitory readable medium of claim 14 , wherein the selection of the one of the first configuration or the second configuration is performed when at least one of the first quality metric or the second quality metric satisfies a quality metric change threshold.
17. The non-transitory readable medium of claim 14 , wherein the identification of the first configuration and second configuration is performed periodically.
18. The non-transitory readable medium of claim 14 , wherein the instructions, when executed, further cause the audience metering device to combine audio based on the selected one of the first configuration or the second configuration to form combined audio, the identification of the media based on the combined audio.
19. The non-transitory readable medium of claim 14 , wherein the first quality metric and the second quality metric are signal to noise ratios.
20. The non-transitory readable medium of claim 14 , wherein the first quality metric and the second quality metric are a combination of signal to noise ratios and bit error rates.