Overview
Encoder Modulator – a professional broadcast device that converts audio/video inputs (HDMI, IP, etc.) into compressed digital streams and modulates them into broadcast‑ready RF signals (e.g., DVB‑C/T, ATSC) for distribution over cable, terrestrial, or IP networks.
The DMB-9581E is a 1U rack‑mount encoder‑modulator integrating H.264 encoding, multiplexing, and modulation in one compact chassis. It supports up to 24 HDMI, IP, and ASI inputs, converting them to RF outputs compliant with DVB‑C/T, ISDB‑T, or ATSC standards (50–960 MHz), and additionally delivers Transport Stream outputs through both ASI and IP ports.
Features:
All-in-One Integrated Encoder, Modulator & Multiplexer – This unified platform accepts HDMI inputs while also supporting 128× MPTS/SPTS streams via UDP/IP and 2× ASI inputs. RF output can be generated from HDMI, IP, or ASI sources. The device provides IP-based outputs including 127× SPTS over IP (UDP/RTP), 1–8× MPTS, and 2× independent ASI outputs. RF output is configurable as 4/8/16 carriers for DVB‑T/ATSC‑T/ISDB‑T/Tb/DTMB, or 16/32 carriers for DVB‑C. (Note: ISDB‑T RF output is limited to 1 ASI input and supports 2K mode only; 4K and 8K are not supported.)
Broad Source Compatibility – Compatible with hybrid input setups such as HDMI + Tuner (supporting DVB‑S2/C/T2/ISDB‑T/ATSC), for example 16× HDMI + 8× programmable-frequency tuners.
Flexible Frequency Allocation – Provides 768 MHz of usable bandwidth, enabling flexible assignment of frequency points across this range (when configured for 16× RF outputs).
Multi-Carrier Configuration Options – Offered in versions with 4/8/16 carriers for DVB‑T/C/ATSC/ISDB‑T, or 32× QAM carriers for DVB‑C, selected based on the number of program channels required.
ASI Port (Asynchronous Serial Interface) is a standard interface used in professional digital video broadcasting (DVB) systems for transmitting MPEG-2 Transport Streams (TS).
Key Features:
Transmission Content: Carries MPEG-2 TS streams without embedded clock signals.
Physical Connector: Typically uses a 75Ω BNC connector.
Data Rate: Fixed at 270 Mbps (with a usable payload of about 200 Mbps).
Applications: Commonly used for signal interconnection between digital TV headend equipment, such as between encoders, multiplexers, and modulators.
In simple terms: The ASI port acts as a dedicated data cable for carrying "packaged digital TV program streams" between broadcast devices-similar to a specialized "TS stream cable" in professional applications.
Application
Flexible DTV and CATV Broadcasting Platforms – Distribute IP and HDMI program sources to all connected televisions via existing coaxial cable networks. Ideal for advertising, surveillance, training, and educational applications. Seamlessly modernize analog head‑end systems with a fully integrated digital television solution. Designed for diverse settings such as corporate offices, hotels, educational campuses, healthcare facilities, restaurants, and other public spaces. Compatible with digital TV transmitters to enable wireless broadcast capability. A cost‑effective solution for digital television signal distribution
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Technical Specifications
Video Specifications
Compression Standard: MPEG‑4 AVC / H.264
Video Inputs:
Version 1: Configurable as 4/8/12/16/20/24 × HDMI inputs
Version 2: Hybrid HDMI + Tuner input capability
Supported Input Resolutions:
1920×1080 @ 60P/60i/50P/50i
1280×720 @ 60P/50P
720×576 @ 50i
720×480 @ 60i
Output Resolution (Maximum 1080P @ 60 fps):
1920×1080 @ 60P/50P/30P/25P
1280×720 @ 30P/25P
720×576 @ 25P
720×480 @ 30P
Bitrate Range: 1 ~ 13 Mbps, selectable CBR or VBR mode
GOP Structure: IPPPP (P‑frame adjustable, B‑frames not used)
Audio Specifications
Encoding: MPEG-1 Layer 2
Sampling rate: 48KHz
Resolution: 24-bit
Bit-rate : 64kbps, 128Kbps, 192kbps, 224kbps, 256kbps, 320kbps, 384kbps
Audio Gain: 0-255
Inputs and Outputs
IP Input and Output
RJ45 Port, 100/1000M GigE Port
Simultaneous output with 127*SPTS + 1*MPTS (4*RF Output)/ 8*MPTS (8*RF / 16*RF DVB-C Output)
TS over RTP, UDP unicast and multicast streaming
Configurable packet size(2-7)x188Bytes
Filter Null Packet
Total Bitrate: 1-200Mbps (Should be More than Encoding bitrate)
Modulation (4/8/16*RF DVB-T/ATSC/ISDB-T or 16/32 DVB-C out for option)
Connector: 1× F‑Type, 75 Ω
Return Loss: ≥ 14 dB
Modulation Error Ratio (MER): ≥ 40 dB
RF Output Level: ‑20 to 0 dBm, adjustable in 0.1 dB steps
Number of RF Channels: 4 / 8 / 16 (selectable)
Modulation Modes: Optional DVB‑C, DVB‑T, ATSC, ISDB‑T, DTMB
DVB-T Modulation
Channel: DVB-T adjacent frequencies
Modulation standard: EN300744
Frequency range:50-960Mhz,1Khz one step
Modulation standard: EN300744
Bandwidth: 6M, 7M, 8M
FFT mode: 2K, 8K
Constellation:QPSK,16QAM,64QAM
Guard Interval 1/4, 1/8, 1/16, 1/32
FEC 1/2, 2/3, 3/4, 5/6, 7/8
TS bit rate < 31 Mbit/s
DVB-C Modulation(16 or 32 DVB-C out option)
16* DVB-C Output Modulation
Channel: 16*DVB-C adjacent frequency RF out
Frequency range:50~960MHz,1Khz one step
Bandwidth range 192 Mhz between start frequency and end frequency,set 16 frequency within 192 Mhz bandwidth range
MER≥40 dB
symbol rate:5~7Mbaud
total output level adjustment -35~-5dBm by 0.1 dB step
DVB-C Standard J83.A (DVB-C, J83.B, J83.C)
Constellation (QAM):16,32,64,128, 256
|
Carrier |
Annex A |
Annex B |
Annex C |
|
|
Constellation (QAM) |
16,32,64,128, 256 |
64 |
256 |
64/256 |
|
Bandwidth (Mhz) |
8 |
6 |
6 |
6 |
|
Symbol Rate ( Mbaud) |
5-7 |
5.057 |
5.361 |
4.2-5.3 |
32* DVB-C Output Modulation
Channel:32*DVB-C non-adjacent frequency RF out
Frequency range:96~864MHz,1Khz one step
bandwidth range 768 Mhz,frequency points can be used flexible within bandwidth range
MER≥40 dB
symbol rate:5~7Mbaud
total output level adjustment -35~-5dBm by 0.1 dB step
DVB-C Standard J83.A (DVB-C, J83.B, J83.C)
|
Carrier |
Annex A |
Annex B |
Annex C |
|
|
Constellation (QAM) |
16,32,64,128, 256 |
64 |
256 |
64/256 |
|
Bandwidth (Mhz) |
8 |
6 |
6 |
6 |
|
Symbol Rate ( Mbaud) |
5-7 |
5.057 |
5.361 |
4.2-5.3 |
ISDB-T Modulation
Channel: ISDB-T frequency
when ISDB-T RF output only 1*ASI input,
Frequency range: 50-960Mhz,1Khz one step
ISDB-T Standard ARIB STD-B31
Constellation: DQPSK, QPSK, 16QAM, 64QAM
Guard Interval:1/32, 1/16, 1/8, 1/4
Transmission Mode:2K,4K,8K(when 4*ISDB-T out, Mode only support 2*K, when 8/16*ISDB-T out,support 2K,4K,8K option)
Code rate:1/2, 3/4, 5/6, 7/8
Bandwidth:6MHz
TS bit rate＜21 Mbit/s
MER≥40 dB
DTMB Standard GB20600-2006
Constellation: 4QAM, 16QAM, 32QAM, 64QAM
Code rate: 0.4, 0.6, 0.8
Guard Interval: 420, 595, 945 IONS
System Management
Connector: 1*RJ-45, 10/100 Base-T interface.
Front panel and web browser via Ethernet interface
Physical and Power
Voltage: 100 to 120/200 to 240V AC ±10%; 50/60Hz
Consumption: 60W
Operating temperature: 0 ~ 45℃
Storage temperature: -20 ~ 80℃
Relative humidity: 10%~90%(non-condensing)
Dimensions: 482mm(W) × 380(D)mm × 45mm(H)(19inch, 1RU)
Weight: 9.6 KGS
FAQ
Order Shipment Schedule
Orders are typically processed and dispatched within 3-5 business days after payment confirmation. For customized configurations or large-volume orders, the exact delivery timeline will be confirmed with your assigned sales representative.
Available Payment Methods
We accept payments via bank transfer, T/T, PayPal (with a 5% surcharge), Western Union, and Alibaba Trade Assurance (optional).
OEM Service Availability
Yes, we provide OEM services. For orders meeting the required quantity, we can customize product labeling, logos, and even modify product models according to your specifications.
Minimum Order Quantity (MOQ)
As we offer a diverse product portfolio, the MOQ varies per product. Factors such as raw material availability, product value, production cycles, order status, and inventory levels determine the MOQ. Some products can be ordered individually, while others may require a minimum quantity exceeding 1,000 units. For accurate and up-to-date MOQ information, please contact our sales team directly.
Factory Information
Our manufacturing facility operates under the name Hangzhou Dtvane Tech Co., Ltd., located at Binkang Road, Binjiang District, Hangzhou, China.
What is a Headend?
A headend serves as the central hub in a television distribution system. It receives TV channels from external sources (such as satellite or terrestrial antennas) and converts them into a standardized format for transmission to in-room televisions. A traditional headend typically consists of receiving antennas and signal-processing equipment that converts, encodes, and modulates incoming signals for distribution.
our product
DIGICAST has specialized in Digital TV Headend Systems for over a decade.
Digital Broadcasting TV Headend System:
Free-to-Air Satellite/DVB-S/S2/S2X/DVB-T/T2/DVB-C/ATSC/ISDB-T/Tb to IP Video Integrated Receiver Decoder (IRD)
Encrypted Channel IRD with Conditional Access Slots, outputting to IP/HDMI/SDI/CVBS
MPEG‑2/H.264/H.265 HEVC 4:2:2 & 4:2:0 Video IP Encoder/Transcoder
Video to RF Encoder‑Modulator for DVB‑T/DVB‑S/S2/DVB‑C/ATSC/ISDB‑T standards
IP/ASI Multiplexer & Scrambler, IP QAM, IP RF Modulator
IPTV/OTT Equipment & Solutions:
Multi‑channel, Multi‑protocol, Multi‑screen IPTV Encoder/Transcoder
Live IPTV/VOD Streaming Server with Distribution, Time‑shift, and Playback functions
Tailored IPTV/OTT Solutions for Hospitality, Community, Hospital, and Resort Applications
Android‑based IPTV/OTT Set‑Top Boxes for Various End‑User Needs
Video Transmission Equipment:
FTTH/XG‑PON EDFA Optical Amplifiers
RF Transmitters
Fiber Optic Terminals
OLT/ONU Devices
We deliver not only standalone audio‑video hardware, but also integrated end‑to‑end solutions, serving direct users, channel operators, system integrators, agencies, and individuals worldwide.
