Palm Centro Cell Phone Review - Audio Quality
We use professional audio testing hardware and software to test the quality of audio produced and received by the Palm Centro. To simulate the human ear and mouth we used a Head and Torso Simulator (HATS), and to analyze the sound sent and received by the phone we used an electro-acoustic analysis program
SoundCheck. This is the same combination used by many handset manufacturers. For more details on how we test see this
article.
Sound Receive Frequency Response (7.82)
Above is a graph of the quality of sound received by the Palm Centro. This is how you hear others during a phone call. The blue line indicates the Centro's performance, while the two red lines are the limits against which we test. An ideal handset's curve would run right between these limits. As you can see, the Centro's performance on this test was a little off, rising above our limits at the lower end and falling off a little too quickly. This can lead to exaggerated lower frequencies (making voices sound boomy). But this is only a minor problem; the sound quality of voices received over the Centro is pretty good.
Sound Send Frequency Response (6.24)
This test measures the quality of sound sent by the Palm Centro. This is how your voice sounds to the person on the other end of the call. The chart above indicates the Centro's performance with a blue line, and the limits against which we test with are shown as red lines. The Centro had some issues, exaggerated across the middle of the frequency ranges and falling off much too quickly at the high end. This can lead your voice to sound too loud or clipped if you have a high voice. But again, this is not a huge problem; your voice will still be understandable by the person at the other end.
Handset Side Tone (9.86)
Side tone is the small amount of your own voice piped back into your ear so you can hear how loud you are speaking. Too much side tone may lead you to speak more quietly, while too little could cause you to speak too loudly. The Palm Centro's side tone measured 17.86 decibels, which is right about where we want it
— 18 decibels is the ideal we test against. This means you will get an accurate indication of how loudly you're speaking on the Centro.
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