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发表于 2007-2-10 01:31:38
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re:5G 无线数字音视频传输模块介绍:...
5G 无线数字音视频传输模块介绍:
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1. Key Features * n3 p h8 X' r0 ]
1) Complete transceiver design of wireless communication at 5 GHz.
2 Y% C: y4 Z$ }4 k3 [- _2) Supports 4.9 to 5.9 GHz frequency band and is controlled by software to comply with ; L2 J0 f. G6 s: w( g/ B
different country spectrum requirements.
! m" Y j2 m f3) Dynamic frequency selection to resist interferences.
' a J1 h# W7 D. z4) Close-loop power control to minimize power consumption and be a friendly neighbor to & _) [8 b0 y5 r+ J) u/ x
other WLAN networks at 5 GHz. 9 b D$ J( j6 Y$ P& I
5) Secure networking to assure privacy and content rights protection.
; l* c' ?+ `% }& F5 L( G( y( t6) Supports most of the digital video formats at TS layer including MPEG-2, MPEG-4,
, G8 [" L% w" J# E! jH.264 and VC-1 (WM-9). U; ?$ e/ E( R" f$ E. ~; \# z1 n" k
7) Supports point-to-point video connection with full QoS and point-to-multipoint video
( }2 q: u! h% H5 P2 T0 W5 [" c( Hbroadcasting. ; j% }2 P/ B/ y: n) i
8) Configurable expansion I/O connector enabling easy integration with existing host . g7 |- I( D x9 J4 N# Y: q. q
systems.
3 J. o, m( q% S) y! s9) HCI interface to the host CPU to enable flexible application development at the host level. ' Q% B0 A/ |5 o3 `9 G. ~7 s8 ?! s1 A' s+ t# H
10) Transmission of IR control signals to the video source devices from the TV location. , M( R; E; M- A" H
2. System Diagram
: ] r# d% z1 X7 NWAV3000 wireless module creates a proprietary 5 GHz wireless network for MPEG 8 c: ~8 K9 u$ p( I- Z
transport stream (TS) communication. The WAV3000 is a complete wireless transceiver module " E( S. |# B. w
that can be integrated as video sender and video receiver according to the host platform. When 2 H3 m' P; d8 T% Y& M9 Z* `2 R
used as video sender, WAV3000 can be embedded in a video source device (DVD, VCR, PVR,
8 a% c' \0 j. N: \! h# WSTB, or PC); and when used as video receiver, WAV3000 can be embedded in a video display
Z1 I, {* W" a2 A( G, T6 Zdevice (TV, flat panel or video monitors). So a pair of the WAV3000 provides a complete,
, W$ d& S, H, W& `glueless wireless connection from TS (of video source) to TS (of video display) with guaranteed
/ h6 w+ ^$ {5 N* iQoS. / F1 v( j4 Y; f# U* a( I
The WAV3000 includes a configurable expansion connector (CEC). All I/O signals can be
" J9 N: m3 g& l5 D4 X: e3 ?5 crouted and configured through the CEC enabling easy integration with existing host systems. 3 ?; i5 ?, e1 s, j/ o, u! k4 l/ B- Q
Figure 1 gives a functional block diagram of the WAV3000 and associated personality & f1 Z! `' b1 R9 p9 D0 y$ ~
module (PM). The personality module intends to simulate the host product platform in which the
1 J4 y9 I& b; N7 w4 tWAV3000 will be integrated. The PM supports demo and evaluation of the WAV3000 with a ; k, x) z- X/ w5 J9 C5 D
variety of video sources (analog and digital) for different applications. It also provides 2 n4 ~( z3 N/ P/ g2 y
capabilities for test and debugging of the core module.
- x5 `8 ?: a6 O2 J$ J; ]' e3 Functional Specifications The WAV3000 supports standard MPEG Transport Stream input and output in either
1 W7 U& b: |0 i% w# @' R: dParallel or Serial mode. The Tx unit transmits the compressed MPEG TS signal to the Rx unit over the air, using the
1 J* a) U/ t: f* C+ k: T% V [WiViTM wireless networking technology at 5 GHz. Supports 4.9 to 5.9 GHz frequency band and is controlled by software to comply with : `3 o. I, f9 S2 f, _
different country spectrum requirements. The system support data rates from 6 Mbps to 60 Mbps. The system supports video bit rates from 3 Mbps to 45 Mbps. Proprietary radio resource control with dynamic frequency selection (DFS) and close-loop
c2 r& @. g' P6 B8 O1 Z: Xpower control (CLPC). Overall video propagation delay of less than 30 ms. Receive sensitivity is –86 dBm for video rate of 6 Mbps, and –78 dBm for video rate of 20 + ?9 u1 [ E3 j
Mbps.
' [' {- f; D: T9 Y0 o4 System Security # d* I5 i. z8 E a* R8 g8 I
The communication is authenticated and the media stream is encrypted to assure for * h/ _; F2 m; U* Q" A5 y `1 A
protection of copyrighted material. Flexible pairing procedure between each Tx Unit and Rx Unit
^: C8 y; Q5 J, G2 S8 aensures private communications between each pair of units. This also allow for coexistence of 9 G' R8 a/ E- m# m5 i. q
multiple pairs of simultaneous operations without cross talk. ; [9 }- |! {; s9 O/ W( a. X& |; S
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