Music can be said to be the basic needs of people. Baidu has a powerful weapon is MP3 search, thereby visible. With the advancement of science and technology, we walked through the record, cassette, cd, mp3, in the line stream, and today in the mobile Internet broke out, from wired to the wireless and trend. The wireless sound has appeared very early, but the market did not open, and now various mobile devices are generally popular, this demand is extremely strong, and the prospect is quite optimistic.
The general wireless sound connection can be divided into 2.4GHz, Bluetooth, and WiFi. If you have the heart, you will find that the two-year Bluetooth sound is hot, open Taobao from dozens of yuan to thousands of yuan, there should be, good. In fact, WiFi audio has long appeared, especially in foreign countries, more representative is SONOS's wireless speakers. Many home theater manufacturers and audio brands have also launched their WiFi audio. The prices of these sounds are currently about a few thousand yuan. The Bluetooth audio and WiFi audio have their own strengths, but it is undoubtedly more powerful from the WiFi audio from the perspective of intelligence and networking.
It can be seen that the most important factors that restrict WiFi audio development are cost issues, especially for portable audio, and portable Bluetooth audio costs even more than 20 yuan. At present, the product of portable WiFi audio on the market is relatively relatively small, there is a big market gap, and the portable WiFi audio prospect is good as cost is further reduced. This love board has received the latest MS1 portable smart sound sample of Broadlink. If you have not heard, you can look at our evaluation articles. Broadlink is one of the most representative companies in the intelligent home industry. Since the earliest launch of smart sockets (Demolition of the panel network), BroadLink can be said to be innovative and forward-looking. Today, the portable WiFi audio can be said to be a different path today, and it is also looking forward to it.
From previous evaluation, it can be seen that the maximum advantage of WiFi sound is that playback mode is very flexible. You can directly connect the cloud resources, but also to play directly; you can play a local SD card or as a small speaker to connect an external source.
MD MS1
The MS1 sound is a closed design, the box is an integrated, and you want to disassemble only the filter cover from the front. When you open the filter, you can see the double speaker, the middle is a special passive radiator. In fact, there is also a passive radiator internally, which is more common in the micro-system and improves the bass performance.
Next, the screw can be removed from the cassette portion from the housing, in fact, it is still very tight, it is more difficult to take it. The internal circuit board is divided into 3 pieces, motherboards, WiFi module parts, and an interface board. The interface sheet and the motherboard are connected by a flexible FPC cable.
(Next)
Let's take a look at the motherboard part, from left to right.
The leftmost portion includes an interface portion of the input signal, such as a power source, an external audio input (AUX). AUX input is first processed by ADC, using AKM AK5358AET. This is a stereo (Stereo) A / D converter, sampling frequency range 8kHz ~ 96kHz.
The middle part is the most important audio processing section, and MS1 uses Yamaha's DSP power amplifier chip YDA174. Yamaha is a historic musical instrument manufacturer, which is also famous in audio treatment, and there are many unique technologies. YDA174 is a chip with a built-in DSP integrated two-way D-class powerfield, including Helios, ambient compensation technology, 3D surround, bass enhancement, and built-in 58 FM sound sources. Class D power amplifier output maximum power is 15W x 2ch @ 8 Euro or 20W x 2ch @ 4 Europe.
The rightmost part is mainly a socket of a wireless module.
The back of the motherboard is mainly the buttons of the control panel and the SD card slot.
The ST microcontroller STM8S005C6 is used here, which is a low cost 8-bit STM8S microcontroller. Integrated 128B of EEPROM and 32KB of Flash, mainly 16MHz, suitable for some IO controls.
Let's take a look at the WiFi module part in MS1, using the MT7620A of the Unit MTK.
The MT7620A program is currently a relatively common solution, which can be seen in Xiaomi route, Baidu route, etc. MT7620A is a SOC chip, integrated CPU, baseband, Radio, etc., only requires a few peripheral circuits to design a wireless route. The CPU kernel is MIPS24KE, the frequency reaches 580MHz, supports 802.11b / g / n protocol, with bandwidth 20MHz / 40MHz. On the module, I saw 64MB DDR2 memory NT5TU32M16DG in South Asia Technology. (Next)
The WiFi module has two external antennas, which are pasted on the internal frame, as shown in Figure F antenna.
There is also a small PCB board inside the sound, mainly including power processing parts such as lithium battery charging and USB power supply, and external audio input interface.
The MS1 smart sound nominal can be used continuously for about 7 hours, and once it is full of 3 hours. The internal lithium battery capacity is 2200mAh, the rated voltage is 7.4V, so the power reaches 16.28Wh.
Next, look at the speaker section, two diameter 35mm speakers, said that the metal part of the speaker is a neodymium iron magnet, which is magnetic design.
The nominal impedance of the speaker is 4 Euro, the power is 7W, and the power is very powerful for portable speakers. In addition to the two speakers, there are two special passive radiats, improve the performance of bass.
Here, the internal basics of MS1 is completed.
By disassembling we can probably understand the internal construction of MS1, and the panel engineer attempt to draw a block diagram (for reference only).
summary
Broadlink's latest portable WiFi audio, designed by Broadlink, TCL, JBL code, perfectly bonded in volume and sound quality. The internal use of Yamaha DSP amplifier and Wi-Fi route, two power reached 7W, magnetic speakers, workmanship and materials are not passed.
Smart Sounds and other intelligent hardware, such as smart sockets, is not a "new invention" product, and the sound is a product well known to everyone, so smart sound is easier to be accepted by the Proan. Especially WiFi smart sounds can more meet the mass needs, such as massive music, more convenient for the network to lay the home theater, and the portable operation is simpler, so the prospect is very optimistic. Of course, it is not enough to impose a WiFi function, it is more simple, and the software experience is better, and the recommended music is more intelligent. For portable WiFi audio, with the further decrease in cost, the market blank will gradually fill, and there will be more different price WiFi audio options. In short, the market that believes that the portable WiFi audio is soon ushered in, and Broadlink is likely to stand in front.
Reference link
Broadlink smart portable WiFi audio evaluation
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Ultra-low power MEMS accelerometer ADXL362 technical data sales
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