It is difficult to find information about smartphone audio input testing because the techniques are so uncommon and complicated. Since Allion has conducted audio testing for many years, we have accumulated a body of knowledge and practical experience in audio input testing, including testing of headphone input jacks and built-in microphones. In this article, we present our audio input test methods and some sample test results based on some recent test data.
Many people use smartphones to play music or record sounds. Due to the fast pace of technological change and fierce competition, consumers have high expectations of smartphone audio performance. Audio tests are usually subjective, but Allion applies objective laboratory methods to detect differences in smartphone audio quality.
Seeing that the previous two rounds of audio quality testing failed to find any significant differences in performance based on capacitor type, Allion decided to investigate additional testing strategies. After some research, we found that some audio magazines mention a ‘whisper’ or ‘breathing’ sound, which inspired this third round of testing.
In our first round of audio quality testing (see previous article), Allion used precision test instruments to measure the sound quality of a high-quality PC motherboard. The primary goal was to compare the audio performance with different capacitor types. We used standard audio test criteria commonly applied to laptops, limited testing to the audible frequency range (20 Hz-20 KHz), and only tested the most common audio sampling rates (44K and 48k). However, the test results for the first round of testing were uninformative, since the audio quality measurements were nearly identical for both types of capacitors (solid and electrolytic).
The PC industry is becoming saturated, so many motherboard companies are looking for new markets and high-quality audio market has become their new target. In the high-quality audio device market, new products gradually spread to consumers and related components and accessories appear.