OPPO R17 Review: Call Quality
Author:Soomal
Source:eng.soomal.com

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OPPO R17 and vivo X23 are similar in appearance, these "brothers" have some similarities in hardware and design. They both use 6.4-inch waterdrop-shaped notch OLED full-screen and in-display optical fingerprint recognition, but the difference between system and software is quite obvious. So, is the R17's voice call and noise reduction performance better?

The R17 uses the Qualcomm Snapdragon 670 processor, which is basically equivalent to the 10nm process improvement version of the Snapdragon 660, the octa-core Kyro360 runs up to 2GHz. The built-in X12 baseband supports the LTE Cat12's 600Mbps download rate, although the baseband specification is basically the same with Snapdragon 660, but it has better support for 4G+. It also supports dual-channel dual 4G and dual-VoLTE standby, but there is still a difference in support for the network on each model phone. The FDD LTE frequency band supported by R17 is B1~B8, which is one less than X23, but basically different and smaller. It supports dual LTE card switching standby. It does not support dual China Telecom SIM cards at the same time. R17 also supports Bluetooth 5.0 and 802.11ac. Wireless LAN. The promotion of charging for 5 minutes for 2 hours calling is still valid, and it supports fast charging of 5V 4A.

R17 runs ColorOS based on Android 8.1. The call test uses Unicom GSM and China Mobile LTE network, and VoIP applications use WiFi network.

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 OPPO R17 vivo X23 OPPO Find X OnePlus 6 Galaxy S9 Huawei P20 Pro vivo X21 iPhone X
Output Level of Earpiece,dB -9.69 -11.52 -11.21/-9.95 -9.38 -8.58 -8.66 -9.4/-10.08 -8.36

The R17 handset output volume is slightly higher than Find X, and the sound is much rougher, which is not a problem for voice calls.

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 OPPO R17 vivo X23 vivo X21 OPPO Find X vivo NEX S OnePlus 6 Galaxy S9 Huawei P20 Pro iPhone X
Face Up,dB 76.9 78.7 77.7 78.7 78.0 74.1 74.3 76.8 78.5
Face Down,dB 74.7 78.7 78.2 76.9 79.5 74.2 75.4 74.6 78.6
In Camera Bag,dB 69.7 73.1 72.0 74.1 73.3 69.2 69.4 69.6 72.2

Surprisingly, the R17's laud speaker volume is lower than X23, slightly better than that of OnePlus 6. Because it is a mono speaker, the music video experience is more general, and the sound style is neutral.

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.

In the VoIP test, we encountered a strange problem, the voice output recording has an irregular delay between each sentence interval of the standard recording signal, about 50 milliseconds or more, the same situation after repeated test, signal, network and other issues excluded. Although this will not have a significant impact on the call, but cannot pass the timeline for comparison of the ITU test scoring program, the current mobile phone's own noise reduction processing will not have such a significant delay, which is generally the cloud There is a bug or software problem in the server, which is not related to the mobile phone, so this result is not recorded.

Testing Item[Hand Holding] Noisy Crowd Background Music Pink Noise Roadside Voice
Total Noise Level Reduction,dB[Higher is Better] 44.0 41.3 47.0 45.8 32.2
SNR Improvement,dB[Higher is Better] 33.0 30.9 38.2 35.5 19.2
SNRI-to-NPLR difference,dB[-4 to 3] -2.1 -0.2 -2.9 -2.9 1.2
Testing Item[VoIP] Noisy Crowd Background Music Pink Noise Roadside Voice
Total Noise Level Reduction,dB[Higher is Better] 26.5 24.1 22.9 25.8 17.9
SNR Improvement,dB[Higher is Better] 21.7 21.0 22.9 25.8 17.9
SNRI-to-NPLR difference,dB[-4 to 3] -1.2 1.2 -2.6 -3.0 1.8
Testing Item[Hand-Free] Noisy Crowd Background Music Pink Noise Roadside Voice
Total Noise Level Reduction,dB[Higher is Better] 23.5 23.3 28.8 34.8 21.1
SNR Improvement,dB[Higher is Better] 20.0 17.2 22.2 23.4 14.4
SNRI-to-NPLR difference,dB[-4 to 3] -1.4 0.1 -3.4 -3.4 0.4
  • 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.

The overall noise reduction performance of the R17 in the handheld mode is good, the filtering of ambient vocals is relatively general, and the noise reduction performance during VoIP calls is more conservative. In the higher demanding hands-free mode, the R17 performs well, and it can better maintain the clarity of voice information under various background noises. It also performs slightly better than Find X and OnePlus 6 in noisy environments such as cars and roadsides. The overall performance of the R17 is quite satisfactory. The volume of the external release is smaller than that of the X23, but the quality of the hands-free call is better than that of the X23. Overall, the quality of the two models is at the same level.

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