Apple Apple iPod touch 5
In the "Apple Apple iPhone 5 smart phones sound quality evaluation report" [Author: Zhao is] we mentioned that the sound performance has been more obvious changes, this is for so many years, the biggest change in Apple's mobile devices. And with the iPod Touch5 of the same generation, will there be obvious changes?
In the joint disassembly of Chipworks and iFixit for iPhone5, the chips were dissected and a chip called Apple 338S1117 was found. This is a custom chip from Cirrus Logic. Its native model is 35L19. Cirrus Logic did not provide detailed information. It can only be inferred from a similar model that it may be a low-power Class-D chip designed specifically for mobile devices.
Apple Apple iPod touch 5-Motherboard
iFixit took the lead in disassembling the iPod Touch5, and found a chip with the model number 338S1116. The function should be similar to that of the iPhone 5's 338S1117. What is certain is that the difference will not be small, and the shape of the chip will be different.
E-MU 1616M PCIe Digital Audio System
In accordance with established practice, we conducted a set of objective tests on the headphone output of the iPod Touch 5. The test was also in the form of a professional-grade sound card input, combined with common analysis methods to provide intuitive measurement results. The actual playback level of the iPod Touch5 is -6.5dB, and we compensate it to the standard level of 0dB during the test by the recording device.
Apple Apple iPod touch 5-frequency response curve
Apple Apple iPod touch 5-total harmonic distortion
Apple Apple iPod touch 5-frequency response curve - intermodulation distortion
From the RMAA test scores, the resolution index is significantly better than the iPhone5.
Apple Apple iPod touch 5-frequency scanning
Apple Apple iPod touch 5-separation test
Apple Apple iPod touch 5-resolution frequency analysis
Apple Apple iPod touch 5-frequency scanning @48kHz
It can also be seen from the spectrogram analysis that the separation index is significantly better than the iPhone5, but slightly inferior to the iPod Touch4. The processor used in the Touch5 is A5, which is the same as the iPad 2. When testing the iPad 2, we found that the two-channel resolution curve of the iPad 2 is inconsistent. The simple description is that the right channel will be more stringed into the left channel. At that time, we thought it was a problem with the A5 processor. The test of the Touch5 basically eliminated the processor problem, and the resolution of the iPad2's amplifier chip may be slightly out of balance.
Compared to the iPod Touch4, the sound of the Touch5 has an audible change, and the trend is also like the iPhone4 to iPhone5. Its changes are mainly reflected in two aspects - dynamic and transient, and therefore affect the changes in high frequency and low frequency hearing.
Compared with the previous game, Touch5 has better transient performance, which is the improvement of the whole frequency band. In the low frequency part, it is easier to feel the change of the striking strength, especially when it is matched with the soft headphones. There are also gains and losses, which will make the high frequency become relatively rough. When expressing the stringed instruments, the problem will be relatively prominent. Better transients can often make people feel more energetic. It is a change that tends to be younger, but it also tends to be tighter. This change is consistent with the iPhone 5.
Although there have been changes, the sound of the iPod Touch5 can still be summarized in the "white boiled water" category, its sound is still the kind of neutral calm and lack of emotional color, not too picky style with headphones, but with soft headphones It seems to be more tolerant.
Compared to the iPod Touch4, the sound quality of the iPod Touch5 has some advantages and disadvantages, but it is slightly less. Compared to the iPhone 5, the iPod Touch 5 performs better in terms of resolution, and the high-frequency listening will be a little more delicate. The overall sound quality performance can be considered as a small step.
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