Android phone sound quality evaluation--Bambook S1 [Engineering Edition]

In June of this year, Shanda announced the release of its own branded Android mobile phone, the model is Bambook S1, which continues to use the brand of Shanda hardware "Bambook". This is not the final listing, but the engineering prototype]. We are concerned about the Bambook S1 mainly because it uses ST-Ericsson's U8500 and we have not touched it before. And pay attention to its sound quality is also because it comes from ST-Ericsson, ST-Ericsson ARM chip solution. Do you remember that we have tested the Codec chip of the Motorola Droid Razr phone with excellent sound quality, also from ST-Ericsson. Although this does not necessarily involve technical inheritance or other inevitable correlations, we are still very interested in this.

Grand Bambook S1 Smartphone - Packaging

Grand Bambook S1 Smartphone

First, let's briefly introduce the core hardware components of the Bambook S1. The Bambook S1 phone uses ST-Ericsson's NovaThor U8500 platform [chipset], which consists mainly of the DB8500 main chip and the AB8500 sub-chip. The DB8500 is equipped with two Cortex-A9 core ARM processors and a single-core Mali-400. Graphic unit. It also integrates a baseband chip that supports HSPA+ and two units that handle video, graphics, and more. AB8500 sub-chip, mainly provides power management, USB bus, SIM card management and audio input and output management. From the disassembly, we can see the AB8500M chip, and the DB8500 processor and Elpida memory chip use the PoP stack package, so it can not be seen directly.

ST-Ericsson Nova Thor U8500 chipset functional structure diagram

Grand Bambook S1 Smartphone - Motherboard

Shanda Bambook S1 Smartphone - AB8500M Chip

Grand Bambook S1 Smartphone - Elpida Elpida Memory Particles

E-MU 1616M PCIe Digital Audio System

In accordance with established practice, we conduct a set of objective tests on the headphone output of the Bambook S1 mobile phone. The test is still in the form of professional-grade sound card input, combined with common analysis methods to provide intuitive measurement results. The output level of S1 is -14dB when the standard level test file is played during the test. In the test, we found a relatively rare problem. The Bambook S1 locks the sampling rate of the audio output to 48 kHz instead of our usual 44.1 kHz. Readers familiar with our related review articles should understand what trouble it will bring. We will give a brief explanation here.

Maybe everyone often looks at our mobile phone sound quality evaluation article, knowing that Android will have inferior SRC problems, but this generally does not affect our usual music appreciation. Because Android's current problem is the 44.1kHz and 48kHz sampling rates, only one can be selected, and the other will have a bad SRC. Most of the phones we are exposed to are based on listening to music applications, so they are all set at 44.1kHz. There are certain problems when playing 48kHz games, movies and other audio tracks. The Bambook S1 is set at 48 kHz, which causes inferior SRC to occur when playing most music. Fortunately, the Bambook S1 is still an engineering prototype, and Shanda developers have indicated that they will fix this problem soon.

Shanda Bambook S1 Smartphone [Engineering Edition] - Frequency Response Curve

Shanda Bambook S1 Smartphone [Engineering Edition] - Noise Distribution

Grand Bambook S1 Smartphone [Engineering Edition] - Total Harmonic Distortion

Grand Bambook S1 Smartphone [Engineering Edition] - Intermodulation Distortion

Shanda Bambook S1 Smartphone [Engineering Edition] - Separation Curve

Test items Test Results
Noise level, dB (A): -92.3
Dynamic range, dB (A): 93.1
Total harmonic distortion, %: 0.0073
Intermodulation distortion, %: 0.0099
Stereo resolution, dB: -85.9

Grand Bambook S1 Smartphone [Engineering Edition] - Frequency Scanning

Grand Bambook S1 Smartphone [Engineering Edition] - Frequency Scanning

Since the Bambook S1 only supports 48 kHz sampling rate, we can only provide a set of objective test scores of 48 kHz sampling rate on the engineering machine. From the RMAA test results, its frequency response curve is very straight, and the test results show that its distortion performance is also better. However, from the spectrogram of the frequency sweep [click to enlarge to see the larger image], there is always some slight distortion around the test signal, which is consistent with the RMAA test curve chart.

to sum up:

We tried to convert several music from 96kHz sampling rate to 16bit/48kHz format [24bit mobile phone is not supported]. From the initial audition, the problem of 44.1kHz Android SRC is still very obvious. This inferior SRC will make the whole sound become Deficiency, and AB contrast can easily find that the sound without SRC is more solid. The headphone driving power of the Bambook S1 is basically the same as that of most mobile phones, and the -14dB output level is low, but it is basically enough with the GR04 and GR07 MKII. However, due to the problem of the sampling rate setting of the Bambook S1, the music of 48 kHz is rare. After the official version of the mobile phone is released, we will further evaluate its sound quality.

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