Palm Treo 755p Cell Phone Review - Audio Quality
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Alfredo Padilla Published on December 20, 2007 Comment on this |
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The quality of the audio you get during phone calls is one of the most important things about any phones. To test this we use professional grade equipment and software, which is often used by the manufacturers themselves. To simulate the human head and ear we use a Head and Torso Simulator (HATS) and to analyze the sound we use Listen Inc's SoundCheck software. For more information on how we test see this article.
Sound Receive Frequency Response (7.87)
The chart above details the quality of audio received by the Treo 755p, this is how others will sound to you. The blue line in the chart indicates the Treo 755p's performance while the red lines are the limits against which we test. The Treo 755p does a decent job staying within our limits until you get to the higher frequencies where it drops off a little faster than we would like. In practice this probably won't have a serious effect, you may notice that higher pitched voices sound a little clipped. You can see below that the Treo 755p's performance isn't the best we've seen, but it's also not the worse.
| Cell Phone | Palm Treo 755p | Palm Centro (on SPRINT) | Palm Treo 750 (on AT&T) |
| Score | 7.87 | 6.24 | 8.24 |
| Received Sound Frequency Response Graph (click to view) |  |
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| Cell Phone | BlackBerry Curve 8320 (on T-Mobile) | T-Mobile Shadow (on T-Mobile) | Sidekick LX (on T-Mobile) |
| Score | 8.30 | 5.68 | 6.74 |
| Received Sound Frequency Response Graph (click to view) |  |
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Sound Send Frequency Response (6.68)
In this test we look at the quality of sound sent by the Treo 755p, this is how you will sound to those on the other end of the line. The chart above details the Treo 755p's performance with a blue line while the red lines indicate the limits we test against. Here you can see that the Treo 755p is pretty consistently above our limits across most frequencies and then drops off too quickly at the end. This means that your voice may sound exaggerated and the be clipped when it gets up into the high end. We were not very happy with this performance, you can see below that the Sidekick LX did perform worse but all our other comparison phones did better than the Treo 755p.
| Cell Phone | Palm Treo 755p | Palm Centro (on Sprint) | Palm Treo 750 (on AT&T) |
| Score | 6.68 | 7.82 | 7.89 |
| Received Sound Frequency Response Graph (click to view) |  |
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| Cell Phone | BlackBerry Curve 8320 (on T-Mobile) | T-Mobile Shadow (on T-Mobile) | Sidekick LX (on T-Mobile) |
| Score | 7.51 | 6.40 | 5.35 |
| Received Sound Frequency Response Graph (click to view) |  |
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Handset Side Tone (6.08)
Side tone is the small amount of your own voice that a handset pipes back into your ear so you can hear how loudly you are speaking. Our ideal for side tone is -18 decibels while the Treo 755p scored -21.92 decibels, which is a little on the low side. What this means is that you may find yourself talking louder than ideal to compensate. The Treo 755p did not perform well on this test, you can see it put up the worse score amongst our comparison phones.
| Cell Phone | Sidetone Measurement | Score |
| Palm Treo 755p | 21.92 | 6.08 |
| Palm Centro | 17.86 | 9.86 |
| Palm Treo 750 | 22.2 | 5.80 |
| BlackBerry Curve 8320 | 17.88 | 9.88 |
| T-Mobile Shadow | 12.64 | 4.64 |
| Sidekick LX | 19.74 | 8.26 |
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