1.completely supports DVD/VCD/CD/MP3 and other A/V multimedia formats
2.4 channel outputs, built-in 4 * 45W HI-FI amplifiers, presenting a perfect audio and video quality, The sound combining with scene can give you a surprising surround stereoscopic feeling!

3.display and multifunctional mode. You can enjoy DVD play at the same time running the GPS system, the display is fluent, bright and exquisite, the brightness and contrast is harmony.

In the car, there are two sound provenances -----from speaker and from microphone, and the sound coupling brings echo in the car. Echo comes of the direct sound coupling as microphone picks up the voice signal from speaker. This status becomes grave in the car as the setting up volume is higher to avoid the noise from engine and road.

The second provenance of echo is indirect coupling or carriage reflects. Voice signal can reflect on each surface. And the power of echo depends on the kind of material used in the car, the harder, the more reflect, the softer material will absorb more echo, so the car window will reflect more echo. Then, the reflecting echo has a delay, and the degree of delay will different with the dimension of carriage and the kind of material. The follow shows these direct coupling and carriage reflects.


Whatever the noise coming from direct coupling and carriage reflects, it is difficult to eliminate successful to bluetooth hands-free car kit. What is more important, this noise is often changing. The main sound provenances include engine noise, road noise and others.



（AEC）is one kind of outlying signal voice model, which bases on the pertinence of speaker signal and multi-path echo coursed by speaker. We can evaluate the echo by AEC model，and amend the filter parameters continual to make the guesstimate near the true echo. Then take out the echo guesstimate from the micro input signal to eliminate the echo and realize the perfect hands-free calling.

• compatible with Bluetooth 2.0 +EDR criterion
• Class 2 power
• built-in antenna
• effective distance--10 M
• temperature: -25℃～85℃
• built-in DSP echo clear-up chip
• echo clear-up: Linetype Echo Clear-Up and 25—35dB,52-65dB Acoustic Echo Clear-Up, the noise within 200mS and realize the perfect hands-free calling
• noise clear-up: 18dB,and get a loud and clear voice
• A/D，D/A：72dB SNR，sampling speed 8-11K

LM、LC、L2cap、SDP、RFCOMM
Bluetooth HandsFree Profile
Bluetooth Headset Profile

support catalog browsing;
Support AVI、MPG、MP3 ect and picture browsing (lantern slide format).