dvb-t-03

發表於 2016-07-18 | 分類於 embedded | | 閱讀次數 |

了解DVB-T IC接收及傳送端處理應用

更新記錄

item	note
20160718	第一版

目錄

目前ITE應用架構
DVB-T傳送端處理
DVB-T接收端處理
- IT9130: ccHDtv Receiver
- IT9305: USB Bridge and TS Aggregator
其它說明
參考來源

目前ITE應用架構

新的方式改由IT951x取代IT950x

來源：Full HD 高效能應用與解決方案研討會 - 同軸電纜 HD 升級大突破

DVB-T傳送端處理

digital video port (DVP) parallel output interface

DVB-T传输芯片

RF Modulator	note
Eagle I (ite9500)
Eagle II (ite9510),2014年	将RF Mixer功能整合进芯片中，大幅减少周边IC使用量

IT9500 ccHDtv transmitter

IT9500 is a series of highly integrated transmitter for ccHDtv camera
The core of IT9500 is a DVB-T COFDM modulator.
- forward error correction coding
- digital modulation
- D/A IQ converter
embedded USB 2.0 interface, and serial/parallel TS interface input/output with built-in de-multiplexer
compliant to the non-hierarchical transmission specified in DVB-T (ETSI EN 300 744)

ITE 9510 Series

item	note
Modulator	1- DVB-T/H (EN 3000 744 v1.5.1) and ISDB-T(ARIB STD-B31 V1.6) Compliant transmitter for Digital Terrestrial Television
	2- QPSK, 16-QAM, 64QAM
	3- 2k,4k,8k FFT
	4- channel band width from 1MHz to 8MHz
input interface	Serial and parallel MPEG2-TS
Control interface	1- USB 1.1 , USB2.0
	UART, I2C

item	note
ite9511	Bandwidth up to 8MB, 720P only (用於720P ccHDtv camera)
ite9513	Bandwidth up to 11MB, 1080P only (用於1080P ccHDtv camera)

part number	description	modulation
IT9511	QPSK (GI 1/8, 1/4) only	Commercial grade baseband transmitter for digital TV with USB and TS interfaces
IT9513	16QAM, QPSK (GI 1/8, 1/4) only	Commercial grade baseband transmitter for digital TV with USB and TS interfaces.

DVB-T接收端處理

IT9130: ccHDtv Receiver

ccHDtv single-chip receiver consisting of high quality RF tuner front-end and COFDM demodulator
It does not require external SAW filter, LNA, or Balun.
- SAW（Surface Acoustic Wave）filter （表面聲波濾波器）是一種高頻的濾波器
- 讓某種波長的訊號通過並過濾其他的訊號及雜訊
- 接收高頻訊號後，輸入端的IDT會將該訊號轉變成表面聲波，藉由壓電基板的傳導傳至輸出端的 IDT，再把表面聲波轉換成高頻訊號傳出
- LNA: Low Noise Amplifer
IT9130: DVB-T Front-End Intergrate Receiver
IT9137 Block

DVB-T COFDM

item	note
AGC(automatic gain control)	AGC measures the received signal strength to determine the correct tuner gain-control signal values.
	DC offset and IQ amplitude and phase imbalance are dynamically tracked and compensated
ACI(adjacent channel interference)	ACI removed by a very sharp digital filter whose bandwidth is independent of the DVB-T channel bandwidth

Operation mode of IT9130

Part	MPEG TS	USB2.0	USB2.0 Diversity/ Dual-channel
IT9135	No	Yes	No
IT9137	Yes	Yes	Mater/Slave

Data path and control path output mode

mode	data path	control path
USB2.0	USB	USB
MPEG TS	MEPG TS	2-wire bus

UHF / VHF RF Tuner
- IT9130 with RF tuner integrated to support DVB-T
- UHF band (470 MHz ~ 862 MHz)
- VHF band (170 MHz ~ 240MHz)

IT9305: USB Bridge and TS Aggregator

TS aggregator
- Null Packet Insertion is supported
- 5 TS input are support

Operation Mode

Part	MPEG-2 TS (Serial)	MPEG-2 TS (Parallel)	USB2.0	CCIR601
IT9303	Yes	No	Yes	No
IT9305	Yes	Yes	Yes	Yes

Data path and control path

Ctrl IF \ OutIF	MPEG-2 TS (Serial)	MPEG-2 TS (Parallel)	USB2.0	CCIR601
Control I/F	2-wire bus	2-wire bus	USB	2-wire bus
Data output I/F	MPEG-2 TS	MPEG-2 TS	USB	CCIR601
Data input I/F	MPEG-2 TS	MPEG-2 TS	MPEG-2 TS	MPEG-2 TS

其它說明

Normal packets have a pseudo-random payload in the data_byte field. A TS packet has a length of 188 bytes and starts with a sync_byte having the value 0x47

來源：The DVB-T2 Reference Streams

參考來源