OnePlus 6 Review: Call Quality
Author:Soomal
Source:eng.soomal.com

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One Plus 6 still maintains the positioning of cost-effective high-end machines, the high configuration of Snapdragon 845 processor and 6GB memory and the price of 3199 yuan, is the cheapest Snapdragon 845 mobile phone that can be bought [as of June 9th, 2018] . In the past, all the subsystems of the one-plus mobile phone were in the middle of the standard and did not exceed the hardware level. So, can One Plus 6 maintain stable performance?

The Snapdragon 845 processor supports 4x4 MIMO multi-carrier aggregation, which theoretically supports the highest Cat.16 downlink and Cat.13 uplink speed, and 4G+ and dual card dual standby. When China Mobile is a secondary card, mobile TD-SCDMA 3G network cannot be used, so consumers who use dual phone cards need to pay attention. In addition, the domestic sales of One Plus 6T, although known as full net supported, it does not support certain specific FDD-LTE/WCDMA bands [mainly 13 and 41 bands]. In other respects, One Plus 6 supports the highest speed 2x2 MIMO 802.11ac high-speed network, and Bluetooth 5.0 and aptX HD, the host is a common two-way microphone configuration, still retains the 3.5mm jack. One plus 6 runs the H2 OS based on Android 8.1, the interface UI is almost the same as the native Android. Of course, the domestic sales version does not integrate the Google Play suite, but there are many pre-installed partner applications. If users want to try it, the less stable Android 9 development preview system. The objective test of voice calls is still completed by China Mobile 4G LTE and Unicom GSM

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 6 OnePlus 5T Galaxy S9 Huawei P20 Pro vivo X21 iPhone X
Output Level of Earpiece,dB -9.38 -9.43 -8.58 -8.66 -9.4/-10.08 -8.36

The output volume of One Plus 6 earpiece is basically the same as that of a plus 5T, slightly better than the vivo X21 but also slightly inferior to several mobile phones with a price above 4000 yuan. The voice quality and clarity performance are also quite satisfactory.

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 6 OnePlus 5T Galaxy S9 Huawei P20 Pro vivo X21 iPhone X
Face Up,dB 74.1 73.1 74.3 76.8 77.7 78.5
Face Down,dB 74.2 73.1 75.4 74.6 78.2 78.6
In Camera Bag,dB 69.2 68.7 69.4 69.6 72.0 72.2

One plus 6's ringtone volume is a little smaller than a plus 5T, as a mono speaker, the sound quality is also obviously not as good as the Samsung Galaxy S9, Razer and other stereo mobile phones. The sound effects when playing games and watching videos are very general.

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] 47.8 44.5 48.5 48.3 33.0
SNR Improvement,dB[Higher is Better] 46.9 44.2 47.9 48.0 32.0
SNRI-to-NPLR difference,dB[-4 to 3] -2.8 -0.0 -3.8 -3.0 1.6
Testing Item[Hand-Free] Noisy Crowd Background Music Pink Noise Roadside Voice
Total Noise Level Reduction,dB[Higher is Better] 19.6 20.0 27.2 30.8 19.7
SNR Improvement,dB[Higher is Better] 16.8 20.0 27.2 21.5 11.6
SNRI-to-NPLR difference,dB[-4 to 3] -1.7 0.6 -4.2 -3.1 0.9
  • 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.

In handheld mode calls, one plus six GSM, VoLTE or VoIP modes have achieved near-limit results. In addition to the vocal background, music and other sounds can be filtered very cleanly and difficult to be perceived by the other side, which is also the normal level of Qualcomm high-end SoC. The noise of the hands-free part is not as clean as 5T, the background sound is relatively more obvious, and the volume of the recording within 10 seconds after the hands-free call starts is small, but would not affect the call quality as a whole.

One Plus 6 upgraded the higher-end 845 processor, the call quality is not much different or improved compared to OnePlus 5T which is based on Qualcomm SD835, the handheld call performance is still perfect, and the noise reduction performance during hands-free calling is not as good as one. 5T is so good, but it does not have any negative impact on the experience of voice conferences, driving, etc. when using hands-free calling. However, the volume and sound quality of the loud speaker are too general. When going out, it is best to use the vibration, and there is room for improvement.

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