Android App automates Bluetooth and analogue audio testing for smartphones and tablets
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It will be useful to network carriers, repair and refurbishment centres and other people who need to evaluate the audio performance of different models and manufacturers against a common standard.
The Android app has four key features. It routes the audio through various analogue signal paths not normally allowed by stock Android OS (for example, making a closed-loop test from analyzer to analogue line-in to device’s speaker and back to analyzer). It uses the device’s record feature, then transfer the resulting file to an APx audio analyzer over USB for analysis. The app also testes Bluetooth signal paths, including the playback of stimulus waveforms over Bluetooth Handsfree Profile (HFP) without initiating a phone call over the network. It automates the entire process with the APx desktop application to control the device over USB, allowing audio test sequences to run through all available signal paths with no user interaction required.
The ability to route analogue audio through arbitrary inputs and outputs in loopback mode makes testing much faster than record and playback and enables real-time electroacoustic measurements. In addition, the default media player is bypassed, so there is no risk of user settings, EQ or resampling interfering with measurements.
The ability to open a SCO and send signals over Bluetooth HFP directly from the phone takes the mobile network’s audio performance out of the equation. The stock Android OS does not allow files to be streamed over HFP. The AP app overrides this behaviour, allowing direct evaluation of the Bluetooth connection quality independent of the mobile network (the weakest link in the signal chain).
The AP Smartphone App for Android supports sine, continuous sweep and multitone signals for music playback signal paths. For voice band, AP recommends using PESQ or POLQA MOS (mean opinion score) perceptual audio measurements, which are fully supported by the AP smartphone app and are incorporated in the accompanying APx project files and test waveforms.
Visit Audio Precision at https://ap.com
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