2.4G wireless digital video conference system

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Parameters and indicators:

receiver	Parameter	launcher	Parameter
Frequency Range	2400 - 2483.5MHz	Frequency Range	2400 - 2483.5 MHz
System Capacity	Basic unit 50	Power	AA Battery: standby (73mA speech (114mA Li Battery: standby (54mA speech (94mA
Demodulation	YFLFSK	Modulation	YFLFSK
Frequency stability	Automatic correction	Frequency stability	Automatic correction
Audio Frequency Response	20Hz-10KHz	Communication distance	10----60M
Distortion	THD (0.03%	Distortion	THD (0.03%
SNR	) 90dB	Battery Specifications *	AA X2
Display	3.4 "LCD screen high-brightness	Microphone rod length	40cm
Audio output	0-0.75V	Display	1 "LCD brightness LCD screen
Power Specifications **	DC12V 500mA	Speak display	Light ring, light screen
Line length	(20 m	battery power	Real-time multi-level display
Output Interface	1 * XLR Male 1 * JACK	Charging	5V 1000mA
Machine size	42.5cm X 18.5cm X 7.2cm	Machine size	After 16.5cm X 14.5cm X 6.5 cm, 1 cm before
* Speech unit can use two kinds of batteries, AA batteries priority		** Prohibit the use of non-native power, otherwise it will damage the circuit

Contrast: digital wireless conference system and wireless conference microphone, wired conference system

Compare Item	Digital Wireless Conference System	Analog wireless microphone session	Wired Conference System
Transmission Technology	Digital Modulation FSK	PLL phase-locked loop	Multi-core cable
Transmission	Packet A / D converted	Voice-frequency carrier	Digitally manage, transmit analog audio
Transmission Content	Audio packets, management instructions	Save voice modulated carrier signal	Analog audio
Voice Quality	Clean and clear fidelity	Significantly inferior to a wired system	Clean and clear,
Immunity	Packet isolated interference signal	Carrier erosion susceptible to interference noise	Shielded cable, interference
safety	Data encryption package and IC information transmission, Non-registered match can not establish communication	PLL simulation technology, can easily be receiving a search frequency monitor	Cable transmission, Confidential
Connection	Clean and self-test frequency connection	Clean the filter settings manually frequency	Special cable with special plug
stability	Boot software correction set frequency	Frequency can not easily offset frequency	The cable interface damp because of oxidation and other signal losses, increased host load
Management function	Chairman of the function, FIFO	No management functions	Chairman of the function, FIFO
Power unit	Standby 54mA, 94mA speech	) 150mA	) 200mA
Management capacity	Unlimited number of units	1 with 4 or 8 with 1,	Not more than 60 units
Expansion	Host software upgrade and expansion, managed on behalf of more than 2000	Physical overlay, easily conflict with howling	Superimposed host expansion, higher costs
consistency	High tolerance components, easy to ensure consistency	Late debugging consistency and quality depend on the components technician	New good performance with the use of time and use of the environment will worsen
Extension	Video tracking, voting (Advanced)	no	Video tracking, voting

Expansion of	Simply adding unit, the code can be quick	Complex, the need to manually calculate the frequency settings, additional configuration Receiver	We need to lay cable system unit can be added
Frequency resources	Each system occupies only one frequency,	Each microphone occupy a frequency, and will produce 2 times 3 times intermodulation interference frequency	No frequency occupancy

Remarks:

About Confidentiality:

Traditional analog microphone using PLL phase-locked loop frequency modulated transmitter, a speech unit signal may be received by the receiver of numerous identical frequency points, based on the difference between close-range reception sensitivity far.

So important confidential place for the need for confidentiality, prohibited the use of all wireless devices, resulting in some places the need to use high-level meeting to discuss a wired system or infrared systems.

Working digital wireless conference system is built on the floor with the receiver unit mutual authentication architecture, each unit at the time of performing the registration statement, the statement inside the unit software based machine code with the receiver unit is returned back to the floor of the machine code calculation and stored; each unit can only speak to establish relations with a certified receiver only if the receiver's machine code and unit registration statement was consistent and machine unit can be opened speech speaking, so the situation does not exist out of the overcharged .

Analog wireless technology is always confidential transmission can not be done.