OnePlus 5T Review: Call Quality
Author:Soomal
Source:eng.soomal.com

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OnePlus is branded international, high-performance-affordable smartphones. OnePlus 5T provides Qualcomm Snapdragon 835 SoC, 6GB of RAM, and 64GB internal storage at merely RMB 2999 ($559 on oneplus.net). So, will it remain the performance of previous generation?

OnePlus 5T still uses the QD835 processor, so the baseband should be the same with that of OnePlus 5. Qualcomm X16 LTE modem supports most mobile network all over the world, reaches peak download speed at 1Gbps, it worth mention that OnePlus 5T does not support LTE bands of Verzion and Sprint, mainly band 13 and 41. In additional, in the dual standby, only the slot one supports 4G, while CDMA network only supported in single SIM card mode. Qualcomm SD835s compatible CODEC including WCD9335 and WCD9341, the latter, more expensive one has better support to Hi-Res audio, so most vendors choose the former one. OnePlus has 3 mics for noise reduction. As usual, we place this cell phone indoor with normal signal, and set the call voice volume to maximum, then call 10010 [GSM], which is China Unicom customer service hotline, and 10086 [VoLTE], which is China Mobile customer service hotline. But VoIP, as some you-know problems, cannot be use normally, so the VoIP test will be holding for a while.

Our Sony XZP comes with the Qualcomm SD835 processor, supports dual SIM card. Sony designed a special SIM card slot, that users can pull the tray out with just their fingernails. If you change a SIM card or MicroSD card, it would restart automatically. The SIM1 tray is using a single tray, and using a LED light to detect whether it is open or closed, when the light leaks, this smartphone may regard this is changing inserted card, then restart. So, we strongly recommend you keep an eye on this tray when changing your SIM or MicroSD card. The call, contractor, SMS interface is just like what native Android is. As usual, we place this cell phone indoor with normal signal, and set the call voice volume to maximum, then call 10010 [GSM], which is China Unicom customer service hotline, and 10086 [VoLTE], which is China Mobile customer service hotline. And we use WeChat, the most popular tool in china, as VoIP. Then use professional sound card and microphone for recording and analysis.

Earpiece Speaker Test

We place this cell phone indoor with normal signal, and set the call voice volume to maximum, then call 10010 [GSM], which is China Unicom customer service hotline. Then use professional sound card and microphone for recording and analysis.

Testing Item OnePlus 5T OnePlus 5 X20 Plus X20 X9s Plus OPPO R11 Galaxy S8+
Output Level of Earpiece,dB -9.43 -9.54 -10.2 -10.1 -10.15 -9.51 -10.2/-9.98

OnePlus 5T earpiece volume is almost the same with that of OnePlus 5, sounds full.

Loud Speaker Test

Speaker test was undertaken indoors with ambient noise level at 40dB or less, we turn up the ringtone volume to its maximum, and then use a sound level meter to measure sound level at the distance of one meter from the phone.

Testing Item OnePlus 5T OnePlus 5 X20 Plus X20 X9s Plus OPPO R11 Galaxy S8+
Face Up,dB 75.7 79.9 78.7 78.8 78.1 75.5 73.4
Face Down,dB 75.9 77.4 79.4 80.1 78.2 75.8 73.7
In Camera Bag,dB 73.0 75.5 73.2 72.8 70.0 69.4 69.1

OnePlus 5T is lower in volume, but similar in quality, comparing with OnePlus 5.

Noise Reduction Test

We place this phone indoors with ambient noise level at 32db or less, in the middle of the room, we use a human-like structure "handholding" the phone to send voice signal, and put surround speakers in a certain distance playing 5 kinds of simulating ambient noise at 6db SNR. Then we standardize the recording from this end, and run a specific program comparing this recording with raw speech recording and noise-speech mixed recording to get noise reduction level, SNR improvement and SNRI-to-NPLR difference quantitative result.

Testing Item[Hand Holding] Noisy Crowd Background Music Pink Noise Roadside Voice
Total Noise Level Reduction,dB[Higher is Better] 46.6 44.5 48.0 47.5 35.2
SNR Improvement,dB[Higher is Better] 34.4 33.0 38.3 36.4 21.6
SNRI-to-NPLR difference,dB[-4 to 3] -3.9 -2.2 -5.6 -5.3 0.2
Testing Item[Hand Free] Noisy Crowd Background Music Pink Noise Roadside Voice
Total Noise Level Reduction,dB[Higher is Better] 30.9 31.1 33.0 37.4 26.8
SNR Improvement,dB[Higher is Better] 25.3 27.3 26.5 25.3 18.0
SNRI-to-NPLR difference,dB[-4 to 3] -1.6 0.0 -2.8 -3.4 1.5
  • Total Noise Level Reduction, TNLR: Total Noise Level Reduction illustrates the reduction of ambient noise level. The average level is above 5dB. Theoretically, higher TNLR would be better, but an over high result may be caused by severe attenuation of voice signal, or interruption caused by poor phone signal or noise reduction algorithm flaw.
    Signal-to-Noise Ratio Improvement, SNRI: capability of an NS method to enhance the speech component of a noisy speech signal from an additive background noise. SNR improves after noise reduction by comparing noise-reduced and raw voice signal. Generally, the improvement is over 4dB.
    SNRI-to-NPLR difference, DSN: the signal level difference between raw and noise-reduced. Noise reduction process would attenuate voice signal level, cell phones would gain signal to ensure the call quality. Theoretically, it would be best that signal level remain the same before and after noise reduction. A standard signal level peak is -2.5dB. If the signal was gained too high, overflow would happen, and that means frequent crackle, too low, voice signal strength would not be enough, and that means the sound would be too low, and the other end would not hear clearly.
    The result is just a test reference under similiar circumstances or conditions, third-party websites or official technical data cannot be used for comparison.

OnePlus 5T performs the same with OnePlus 5 in hand-holding noise reduction, able to filter most ambient noise in simulating circumstances, except human voice, but will lose some voice information in high strength and continuous background noise. In hand-free mode, OnePlus 5T is slightly better than OnePlus 5, useful in cars or voice meetings.

Overall, OnePlus 5T is at the same level of OnePlus 5T, including earpiece volume, loud speaker sound quality, and noise reduction in most circumstances, just a little lower in loud speaker volume.

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