In recent years, with the rapid development of mobile Internet, the battle of smart home entrance has become more intensified, and all kinds of products with "intelligent" banner swarmed, such as intelligent routes, smart bulbs, smart sockets, smart speakers, etc., but in the final There is no product that can really poke the pain points in the user. The intelligent road is still "the road is long and the road is far ...
A few days ago, I'm using a WiFi speaker - Xiaozhi smart speaker (trial evaluation), Xiao Zhi smart speaker, the main WiFi speaker, voice interaction, voice-controlled smart home these major features, when you first Type of contact this product may feel more new, amazing!
However, the pair of love boards is second to contact WiFi speakers, and I have used a Broadlink WiFi speaker (Broadlink WiFi speaker, disassembly) is very impressive, I really want to say that these both Bad, single voice quality, listening, Broadlink should be clearly dominant, the following is some of the two WiFi speakers comparison:
However, is the fact that the fact is like the surface? After removing the smart speaker, we will not be late.
Disassemble Xiao Zhi smart speaker
From the love board, the experience of the Broadlink WiFi speaker is seen. The tank will be removed first, Xiao Zhi is no exception, unversing the three screws at the bottom (feel only to decorate), with tools to open the speaker, action Still gentle, too wild, easy to break the FPC cable of the touch button board, as shown below
The structure of Xiao Zhi is still very simple, but from the appearance seems to be exquisite products, it is actually seen with DuPont line to drive the power interface and the drive signal line of the speaker. Suddenly some speechless, not from the reliability of the circuit connection .
After removing the motherboard, a WiFi antenna is also attached to the Xiaozhi undercar, a 1400mAh battery and a circular iron block (as a fixed action).
Another convenient, Xiao Zhi's top cover is a speaker and a button touchpad structure. Take out the speaker, you can see the tabular parameters: impedance 4Ω, power is 3W, which is much lower than the speaker power of the Broadlink WiFi speaker.
(Next)
After getting off the speaker, you can see the four screws of the touch panel on the top case, and then remove the touch panel circuit (including the backlight LED circuit).
The principle of this touch circuit is based on the principle of capacitive induction, and by senseing the capacitance of the two electrodes in the PCB, it is likely to be in contact with ATMEL QTOUCH in the microcontroller development board. Las's Capsense principle is similar.
It is very simple, this is basically unpacking the small Zhikebox, see Xiao Zhi Family Fanta photo below.
Xiao Zhi hardware principle
After removing the small hi-speaker, we will look back at the head to see its hardware program, and the eye is very complicated. This is not like a simple WiFi speaker (contrast the Broadlink WiFi speaker disassembly).
Indeed!
From the overall solution, Xiao Zhi uses a ready-made Rick-core micro RK3066 module scheme, RK3066 SOC + 1GB RAM + 4GB Flash, which can be a more mainstream tablet program for two years ago (representative as ifive2 tablet)
Rising Micro RK3066 SOC Some main features:
40 nm low power technology
Dual-core Cortex-A9, frequency up to 1.6GHz
Quad-core MALI-400MP4 GPU, frequency up to 400MHz
High performance H.264 MVC audio decoding
Built-in HDMI1.4B
Support double-screen display, support 2048x1536 resolution
Support MLC NAND, EMMC, full-memory chip type support, DDR3, DDR3L, LPDDR2
From the simple features of RK3066, we can not find this SOC's powerful, the fact is true, it is a SOC of a tablet program, but it is used in a WiFi speaker. Is there a small use of a small ? What is this? (Next)
No, we are not busy with the conclusion, then take a look at other onboard resources of Xiaozhi smart speakers, as shown below
The main resources of Xiao Zhi smart speaker onboard are:
Core Control Processing Module: Ruixin r RK3066 + 1GB RAM + 4GB Flash
WiFi module: Ruixin micro RK903 (It is said to be WiFi / BT / FM three-in-one SOC, but there is only WiFi functionality)
Audio CODEC: CHINSION CX20921, Riyi Alc5631
Others: Huabon Electronics SPI Flash, Audio Amplifier FT2820P
In addition to weird RK3066 SOC solutions, you may be more strange to be two audio CODEC devices onboard? I just felt strange, but I watched the layout of the PCB board and found some clues. If you carefully look at the MIC input of the motherboard, it is found that in the design of the hardware solution, the MIC input is made, as shown below.
This is said, the product of Xiao Zhi has the function of the main voice interaction and voice control command, but to think about this function to achieve the most ideal actual experience, it is best to surround the small Zhike box (for example, the northwest of southeast The corner can have voice input interface, design four-way MIC input is catering to this requirement.
However, ideal is full, the reality is the bone feeling, and the four-way MIC input is indeed designed when the hardware schematic design is designed, and this audio CODEC CX20921 with the four MIC inputs is also available. However, in the process of actual wiring, there is no way to distribute the four-way MIC in the four orientation of the four orientations in the process of no cost (other than the number of layers that do not increase the layer of the PCB board). (OK, you also It is not enough to spit the Layout engineer. It is possible to measure the current solution design after measuring a variety of results (perhaps you have different understandings).
In addition, Xiao Zhi's motherboard has many unpocked functions, such as the Bluetooth module (guess), HDMI interface, etc. on the back surface, it seems that we may not be Xiao Zhi's "final form" at this time. .
OK, let's take a look at the entire hardware program of Xiao Zhiyou box, the brief principle block diagram is shown below:
Wolf but no tooth
Are you still confused after reading the entire hardware program of Xiao Zhi? If only as a WiFi speaker, Xiao Zhi's hardware program is indeed small to use, even at all, there is no concept of speakers (anyway, the author does not recognize the sound quality). However, if you recall the hardware solution after the Broadlink speaker disassemble, let's take a look at Xiao Zhi's program. Do you still think that Xiao Zhi is just a WiFi speaker?
As long as the engineer is not stupid, it will definitely use a plan to do a tablet, running the Android system, only one WiFi speaker function? If you deeply dig the R & D team of Xiao Zhi, you will find that they are doing intelligent voice assistants, in the characteristics of the product, but also reflect this feature, but in the actual experience, these functions are not too It is easy to use (if the voice recognition is not accurate), which allows us to think that Xiao Zhi is a WiFi speaker, which is obviously a misunderstanding, intelligent voice interaction control should be a key point!
Review the hardware program of Xia Zhi, is it ahead of Mourns. It can be said that Xiao Zhi is a product, running the Android system, integrating its own voice assistant features through the tablet plan, and has the same cloud service, such as the cloud service content such as the clouds, shrimp music, Himalaya radio, will so The product is packaged into a "WiFi Speaker Status". This practice is quite common in emerging small entrepreneurship companies. It is not blamed. So, what is the product of Xiao Zhi, what is it? Here's this picture has done a good interpretation.
Xiao Zhi, I want to be a similar intelligent home central brain, through its speech interaction characteristics, implementation of other home appliances, intelligent products. However, in the current situation, Xiao Zhi is a state of wolves, but it is still in the state of "ideal very full, realistic is very bone", there are still many problems, such as the sound quality of the speaker, the product design, the four-way MIC input is only only It realizes the two channels, WiFi configuration is not smooth, voice control is not accurate enough (answer is not asked), etc., for a buddy, it is more fuzzy (a little "four unlike"), this is basically fatal, same, as a user, first It is definitely not considering buying such a failure product, and this is just left the opportunity of the Jedi counterattack to other manufacturers. Who is deer, we will wait and see!
Reference link
Broadlink portable WiFi audio complete disassembly
Broadlink intelligent WiFi speaker use evaluation
Xiao Zhi Super Smart Speaker Using Reviews
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