Microsoft Surface Pro2 sound quality assessment report

On November 11, 2013, in this special day of [Forever Alone] and impulsive online shopping, Microsoft's second-generation Surface tablet was officially launched in mainland China as scheduled. The main difference between Surface Pro2 and the previous generation is processor upgrade. To Intel Haswell architecture i5 4200U dual-core four-threaded mobile processor, clocked at 1.6GHz, the maximum core frequency up to 2.6GHz. The graphics unit is also upgraded to GMA HD4400, the screen is still 10.6-inch 1080p resolution indicator. Due to the Haswell processor The range improves standby power consumption, and the Surface Pro2 battery life is significantly improved compared to the previous generation when the battery capacity is unchanged. The second generation of Surface has also changed a bit, the new Touch Cover touch keyboard and Type Cover keyboard Support backlight function, the price is still expensive [retail price is more than 900 yuan], but fortunately, the price of the Touch Cover generation has dropped to the level of the normal keyboard. The appearance of the Surface Pro2 has not changed much, still using VaporMg aluminum-magnesium alloy casing, The current 128GB version is priced at 7388 yuan.

Surface Pro2 runs 64-bit Windows 8.1 system, the audio architecture is still UAA [Universal Audio Architecture], and like other laptops, Surface Pro has a USB3.0 interface for external USB sound card use, and it also comes with Group 3.5mm headphone microphone interface. Through the disassembly diagram of the ifixit website, you can know that the onboard sound card adopts Realtek ALC230 CODEC, supports up to 24bit192kHz sampling, and the index has not changed. We are still concerned about the second generation Surface Pro headphone output. Sound quality performance.

By convention, we still use a professional sound card to perform a series of objective tests on the Surface Pro2's headphone output and provide an intuitive analysis. The Surface Pro2's maximum volume output level is -4.4dB, which is slightly higher than the first generation -5dB, but this difference Almost negligible.

Compared with the previous generation, the Surface Pro2 has a small difference. The problem of excessive harmonics at the 48 kHz sampling rate is solved. The distortion level is consistent with that at 44.1 kHz. However, the reader with good display can find through the frequency response scan. At 44.1 kHz sampling, there are many background harmonics interlaced at high frequencies. Generally speaking, the sound bottom is relatively clean. In subjective audition, we try the headphones such as Wesson VSD1, innovative Aurvana Air, Pioneer SE-A1000, etc. .

The Surface Pro2 also has the same driving force. It can easily push the small earbuds with 25% of the system volume. The sound is clean, but the overall is a bit blunt, the high frequency is slightly rough, but it is still acceptable range, sound style and generation Nexus. 7 is close, but the driving force is better. The low-impedance large headphones can also display a more stable sound level, which is more related to the notebook power supply, but the sound is not solid enough, the high-frequency burr is heavy, and the sound is obviously better than the desktop. The onboard sound card of the computer is clean. This is probably the sound quality that the Realtek ALC series can make under normal conditions. It is recommended to use earphones or headphones with a relatively thick sound and less sensitivity, within 400 yuan. Small active speakers can also be considered. Users with higher requirements can naturally use the USB sound card or independent DAC decoder. Unfortunately, the Surface Pro only has one USB output port. Choose a Bluetooth wireless product.

It is also worth mentioning that the surface level of the Surface Pro is usually due to the large output power. Most people are more willing to use the laptop, but the high frequency performance of the Surface Pro2 speaker is better than the average product. More detailed, but the sound is a bit thin. When the stand is placed on the table, the external speakers of the Surface Pro2 enhance the mid-low frequency performance through reflection. In general, the sound quality of the Surface Pro2 is basically the same as that of the previous generation. The sound is clean, but it is also blunt, solving the problem of more harmonics at the sampling rate of 48 kHz. Overall, it is much stronger than most notebooks with poor control of low noise. Because of the system and the ordinary PC. Windows 8.1 is no different, we will not introduce the system experience.

Electronic wristband concept
Electronic positioning strap tamper using GPS / Beidou positioning and GSM networks combined with real-time data transmission and positioning and strap tamper. The product is easy to use, high regulatory efficiency, low maintenance costs, and salient features of the human safety, health, electromagnetic radiation pollution, the use of more security. Each device has its own identification IMEI number, a single data upload the background, to complete the automatic identification of personnel, tracking, legal status and other DND automatic investigation. It can be applied to attendance probation officer trajectory tracking, automatic access control, message notification, especially in security issues have become increasingly prominent today, security management and real-time tracking of personnel in a variety of industries growing demand, electronic tamper wrist with its superior performance, reliability and cost-effective to provide customers with a successful solution.
Electronic wristband target user
Electronic watch specifically for judicial community correction crowd custom wearable integrated location device, and community corrections platform docking system, completely solve the "man-machine separation" issue, can truly realize the inmates in control, effectively prevent the removal correction drain straightening phenomenon. Platform to support electronic wristbands identity registration and management; electronic wristband with inmates correspondence information; electronic wristband capable of configuration changes, such as the frequency of reported information, and configure and manage the activities of inmates region ; able to use GIS geographic information, obtain location information labeling electronic watch, and management. When the battery is depleted, the abnormal situation of bracelet destroyed can be reported immediately.
Electronic wristband features
(1) electronic wristband built-in GSM communication module, data interaction.
(2) electronic wristband waterproof to IP67 level.
(3) electronic watch with tamper feature enables location tracking, automatic location information reporting, automatic alarms, automatic alarm is reported, the interaction with the system platform, system configuration and other functions.
(4) receiving display electronic watch with SMS functionality.
(5) real-time location queries
(6) SOS emergency alarm
(7) an electronic fence alarm
(8) Tamper function: non-authorized force to remove or destroy, it will continue to send the alarm signal recording time information
(9) low pressure alarm: Low-voltage prompts charging, low voltage uploading information in order to charge it in time
(10) Built-in acceleration sensor
(11) Fuel Gauge: uploaded regularly wristband Charge Information
(12) Display: display time, and support for customized services.
(13) Button Function: Lit TFT display. Button command can also be used to help the police
(14) ultra-low power consumption, long standby time
(15) Support SMS View
(16) Online Tracking Platform Synchronization
(17) supported by the server multiple instructions simultaneously issued
(18) alarm function
When the following occurs when a timely warning SMS or internet (including, but not limited to):
1, the electronic watch (bracelet) destruction (including wristbands were cut and remove from the body, etc.)
2, the power shortage.
3, the electronic watch display location information is being allowed to cross the border, fast-moving close to a certain area, for a long time does not move and so on.

Characteristics of electronic wristbands

1.power standard: Working microwatt power level, the standby power consumption of 5mA
2 .Battery Configuration: Rechargeable lithium polymer battery, 660mAh capacity
3 .Packaging Features: ABS plastic, high-strength anti-drop and vibration, waterproof rating IP67. Tensile 30KG
4 .Environmental Characteristics: Operating Temperature -30 â„ƒ ~ 70 â„ƒ, Humidity <95%
5 .Size: 41 Ã— 38 Ã— 15mm, Strap length 132mm
6 .Appearance section
(1) electronic wristband using harmless materials, safeguard human security.
(2) electronic wristband waterproof features to meet waterproof, dustproof, drop requirements
- Strap length not less than 16cm, length can be adjusted between 16cm-22cm
- Main module width is not more than 43mm
- Wristband thicker than 5mm
- The width of the strap portion is not more than 21mm
7.Electronic watch battery part
(1) Electronic waterproof watch with magnetic interfaces charger by Community Corrections staff or community charge inmates themselves.
(2) the battery weighs less than 60g, the battery capacity 620mAh, built into the bracelet.
(3) batteries are rechargeable, long time no more than 1.5 hours to charge.
(4) the longest battery standby time is not less than 7 days.

8 Color: can be customized. Weight: 92g
9 reliable operation: full consideration of lightning protection, waterproof, anti-shock and other industrial environmental applications; production process in strict accordance with the ISO9001 quality standards for many aspects of quality testing.

Operating mode
Already approved, the community correction officers other regulatory functions in everyday Correction, with high-precision positioning bracelet device, built GPS, LBS, WIFI positioning modules, is one of the key features internet. These include real-time monitoring, historical monitoring, zoning activities, the district alarm function, disassemble alarm; the first four sub-functions with the monitoring center functions as the final "Removing Alarms" guarantees correction officers during wear, if found to be forced when removing the need to record the alarm on the system platform and corrected promptly notify regulators.

1 electronic wristbands to support GPS, base station, WIFI positioning mode, positioning through GPRS to transfer information to the server and back wearing the device a "proactive approach" to work. When tamper alarm occurs, will take the initiative to report tamper and low battery information on low battery; click of a button, you can trigger the display shows the time, battery and other information;
2 tamper:
Electronic wristband with 3-way tamper (alarm), built-in light sensing circuit boards, capacitive sensing, strap anti-cut function. Remove or destroy unauthorized force, the system will trigger an alarm.
3 positioning information reporting
Supports command reported receiving system (the system issued a directive, electronic wristband immediately reported location information), regular automatic reporting, exception reporting location information, equipment damage reporting and other functions, network status and can handle exceptions.
(2) Location reporting frequency: maximum frequency no greater than three minutes, once the lowest frequency less than 1 hour. Reporting frequency can be set according to demand and smart regulation.
(3) The base station mode LBS positioning accuracy is not more than 500 meters, at the United WIFI and GPS positioning mode positioning accuracy is not more than 30 meters, intelligent positioning mode can be set and contribute to energy saving.

Judicial GPS Watch

Smart Gps Watch, Judicial GPS Watch, Anti-Dismantle GPS Watch, GPS Watch for Prisoners, Electronic GPS Watch, GPS Watch Bracelet, GPS Watch Locator

Shenzhen Yixie Electronics Co.,Ltd. , http://www.aprsu.com