DVB-T Modulator

Best DVB-T Modulators / Multiplexers

DVB-T is an abbreviation for "Digital Video Broadcasting — Terrestrial", it is the DVB European-based consortium standard for the broadcast transmission of digital terrestrial television. This system transmits compressed digital audio, digital video and other data in an MPEG transport stream, using coded orthogonal frequency-division multiplexing (COFDM or OFDM) modulation.

Best DVB-T Modulators:

This platform is ideal for corporate MATV systems or in house HD video distribution from SDI sources although it is not recommend for broadcast headend signal origination due to lack of 708 closed captioning support

Features

  • QPSK QAM-16/26 RF Out up to 4 Adjacent
  • IPTV Output Unicast or Multicast IGMP UDP,RTP,RTSP
  • ASI Output with multiplexer cherry picking
  • Any SDI Input up to 3G-SDI @1080p60
  • ASI Input SPTS or MPTS up to 120 Mbps
  • Fully Network Managed through browser
  • Integrates fully independent encoders with a multiplexer and modulator
  • Modulates up to 4 adjacent QPSK, QAM-16/64 carriers with up to 28 Mbps each
  • Supports full HD 1080p60 input & encoding from any HDMI digital video source
  • Each encoder independently configured: supports all standard HDTV resolutions
  • IPTV output on second network port in UDP IGMP Multicast or Unicast format
  • DVB-ASI output on mirrored BNC terminals for use in broadcasting systems
  • Fully network managed device with all settings configurable through web browser

Simple to distribute over coax and are visible on any TV without needing video adapters or set top boxes.

Features

  • Conversions : HDMI to RF DVB-T , HDMI to IP, HDMI to ASI
  • Any 1-4 HDMI Input up to 720p/1080i/1080p60
  • Licensed HDMI inputs
  • 1-4 CATV RF Output up to 4 Adjacent channels
  • QPSK QAM-16/26 RF Out up to 4 Adjacent
  • Fully IP control and Network Management through browser
  • Front Panel LCD local control   
  • IPTV Output Unicast or Multicast IGMP UDP,RTP/RTSP
  • ASI Output with multiplexer cherry picking
  • Low Latency available   70-120ms
  • AC3 Audio available (AC3 model)
  • MPEG2 Video or MPEG4 H.264 Encoding
  • Firmware for ATSC, DVB-T, DVB-S2 Available
  • 2  slot design – Other Video Inputs cards available –Hot swappable - SDI Card, YpbPr Card.
  • 5 Years warranty
  • Any HDMI Input up to Full HD @1080p60
  • ASI Input SPTS or MPTS up to 120 Mbps
  • Integrates fully independent encoders with a multiplexer and modulator
  • Modulates up to 4 adjacent QPSK, QAM-16/64 carriers with up to 28 Mbps each
  • Supports full HD 1080p60 input & encoding from any HDMI digital video source
  • Each encoder independently configured: supports all standard HDTV resolutions
  • IPTV output on second network port in UDP IGMP Multicast or Unicast format
  • DVB-ASI output on mirrored BNC terminals for use in broadcasting systems
  • Fully network managed device with all settings configurable through web browser

Provides 5 full RF carrier outputs for generating channels from content ingested through the ASI input. Encoding in either MPEG-2 or H.264 is provided for 4 crystal clear video streams up to 1080p60 each

Features

  • Broadcast over existing Coaxial Cabling to an unlimited number of Televisions with FULL HD
  • Perfect for Professional Stadiums and Arena's
  • #1 in Live Sports and Entertainment 
  • Broadcast Live HDMI & YPbPr Video as Cable TV & IPTV Channels.
  • Licensed HDMI inputs - works with any source like DVD, Blu-Ray, or any STB
  • Convert HDMI & Component YPbPr HD Video to HDTV Channels
  • Any 1-4 HDMI & YPbPr Inputs up to 720p / 1080i / 1080p
  • Licensed HDMI inputs - works with any source like DVD, Blu-Ray, or any STB
  • 4 HDMI Cables FREE
  • Support DD AC3 (2.0 / 5.1 / 7.1) passthrough (for HDMI interface only)
  • Support CC (Closed Caption) EIA608 (from CVBS input)
  • 1-4 CATV RF Output up to 4 Adjacent channels
  • QAM-256/64, DVB-T & ATSC formats available
  • Fully IP Control and Network Management through browser
  • Front Panel LCD local control   
  • IPTV Output Unicast or Multicast IGMP UDP, RTP / RTSP
  • ASI Output multiplexer with cherry picking
  • Low Latency available 70-120ms
  • Dolby AC3 or MPEG1/2 Audio Encoding
  • MPEG2 or MPEG4 H.264 Video Encoding
  • Firmware for ATSC, DVB-T, DVB-S2 Available
  • VCT (Virtual Channel Table) support for DVB-C and ATSC
  • LCN (Logical Channel Number) support
  • 5 Years warranty

These systems accept video inputs in all standard HD or SD formats, including component, composite, or HDMI. In addition they also support all other advanced functions normally found on larger 19 in rack systems.

Features

  • Dual HD or SD channels in compact encoder modulator form factor
  • Supports both MPEG-2 or H.264 video encoding codecs
  • Supports Dolby AC/3 audio passthrough up 7.1 channels
  • Models available for ATSC, DVB-C, or DVB-T Television (unit comes loaded with QAM & ATSC modulation standards)
  • Supports IPTV output in UDP format for unicast or multicast
  • Supports EIA 608 type closed captioning on analog input
  • ASI input and multiplexing function provided with ASI output

This unit has the ability to ingest IP Transport Streams and multiplex them among the RF output channels, similarly you can also input a single ATSC (or other RF modulation standard) and add its transport streams among the QAM output.

Features

  • 12 HDMI inputs with 12 CC inputs via CVBS
  • (Data 1 port) over UDP and RTP
  • MPEG1 Layer II; Dolby AC3, AC3 pass through ; MPEG-2 AAC, MPEG-4 AAC
  • HD (1080i/720p) to SD (576p/480p) downscale conversion
  • 1MPTS and 24 SPTS IP (DATA1 and DATA2 port) output over UDP, RTP/RTSP
  • ASI output mirrors one of the RF carriers
  • PID remapping/ accurate PCR adjusting/PSI/SI editing and inserting
  • Control via web management NMS
  • 16 Groups Multiplexing/Scrambling/ DVB-C QAM ANNEX A and B  Modulating (based on RF)
  • 8 Groups Multiplexing/ DVB-T/ATSC Modulating (based on RF)
  • 6 Groups Multiplexing / ISDB-T Modulating (based on RF)
  • Up to 16 MPTS IP (Data2 Port Only) output over UDP, RTP/RTSP (# of MPTS is based on RF standard of device) (16MPTS for DVB-C; 8MPTS for DVB-T/ATSC; and 6MPTS for ISDB-T)

New high density HD encoder RF modulator has an all new platform for modulation for up to 12 SDI Inputs in SD/HD/3G-SDI sources while simultaneously being able to output IP Transport Streams from those sources.

Features

  • 12 HD-SDI inputs with MPEG2 & MPEG4 AVC/H.264 Encoding
  • 1 RF tuner input for re-mux  The tuner - base model support ATSC but QAM or DVB-T or ISDB-T tuner could be requested
  • 256 IP(DATA1 port only) input over UDP and RTP protocol
  • MPEG1 Layer II, MPEG2-AAC, MPEG4-AAC, Dolby Digital AC3 (2.0) encoding AC3 (2.0/5.1) passthrough
  • 16 groups multiplexing /Scrambling/ DVB-C QAM or ATSC  modulating
  • 8 groups multiplexing / DVB-T modulating---Optional
  • 16 MPTS IP (DATA2 port only) output over UDP, RTP/RTSP
  • 8 MPTS IP (DATA2 port only) output over UDP, RTP/RTSP--only for DVB-T RF out
  • PID remapping/ accurate PCR adjusting/PSI/SI editing and inserting
  • Control via web management
  • Lowest cost per channel, breakthrough price

RF Modulators

RF modulators are not used only in antenna systems (MATV/SMATV). Sometimes, the distribution of signal A/V signals via coaxial cable (after conversion to RF signal) is much simpler and less expensive than other solutions - especially in situations where the signal has to reach multiple points (receivers). RF modulators can be divided into two main groups, depending on the character of the output signal - digtal (DVB-T) modulators and analog modulators. Other sub-divisions may be based on the kind and number of inputs (channels), output frequency range etc.

What are types of digital modulation?

Digital modulation is similar to analog modulation, but rather than being able to continuously change the amplitude, frequency, or phase of the carrier, there are only discrete values of these attributes that correspond to digital codes. There are several common digital modulation schemes, each varying separate sets of parameters. The simplest type is called On Off Keying (OOK) where the amplitude of the carrier corresponds to one of two digital states. A non-zero amplitude represents a digital one while a zero amplitude is a digital zero. A specific implementation of OOK is Morse Code. Frequency Shift Keying (FSK) is a form of frequency modulation where a certain frequency represents each binary value. Finally, Quadrature Amplitude Modulation (QAM) uses combinations of amplitudes and phases to represent as many as 1024 digital states.

Digital vs analog modulators

Using an analog RF modulator is by far the cheapest solution. A digital modulator costs more, but it has a number of advantages associated with the distribution of the signal in digital form - good and identical image quality in the whole network, possibility of distributing HD content, effective use of RF spectrum (several A/V signals can be distributed within one RF channel). In digital modulation the signal can easily disconnect from noise, which is much more difficult when using analog modulation. Most of the signals that we transmit in nature are analog, like voice signal and it is much simpler to complete analog modulation comparing with digital. But when using digital modulation, you require transmitting through an ADC converter before transmission and a DAC at the end of the receiver for recovering the unique signal. The extra phases needed to transmit DM enhance both the price and difficulty of the transmitter as well as receiver.

DVB-T Modulators - Basic information

DVB-T is an abbreviation for "Digital Video Broadcasting — Terrestrial"; it is the DVB European-based consortium standard for the broadcast transmission of digital terrestrial television that was first published in 1997 and first broadcast in the UK in 1998. This system transmits compressed digital audio, digital video and other data in an MPEG transport stream, using coded orthogonal frequency-division multiplexing (COFDM or OFDM) modulation.

It is also the format widely used worldwide (including North America) for electronic news gathering for transmission of video and audio from a mobile newsgathering vehicle to a central receive point. Instead of carrying one data carrier on a single radio frequency (RF) channel, COFDM works by splitting the digital data stream into a large number of slower digital streams, each of which digitally modulates a set of closely spaced adjacent sub-carrier frequencies. In the case of DVB-T, there are two choices for the number of carriers known as 2K-mode or 8K-mode. These are actually 1,705 or 6,817 sub-carriers that are approximately 4 kHz or 1 kHz apart. DVB-T has been further developed into newer standards such as DVB-H (Handheld), which was a commercial failure and is no longer in operation, and DVB-T2, which was initially finalized in August 2011.


DVB-T offers three different modulation schemes: QPSK, 16QAM, 64QAM and has been adopted or proposed for digital television broadcasting by many countries using mainly VHF 7 MHz and UHF 8 MHz channels. DVB-T as a digital transmission delivers data in a series of discrete blocks at the symbol rate. DVB-T is a COFDM transmission technique which includes the use of a Guard Interval. It allows the receiver to cope with strong multipath situations. Within a geographical area, DVB-T also allows single-frequency network (SFN) operation, where two or more transmitters carrying the same data operate on the same frequency. In such cases the signals from each transmitter in the SFN needs to be accurately time-aligned, which is done by sync information in the stream and timing at each transmitter referenced to GPS.
 

Modulation - spontaneous or deliberate change of signal parameters. If sinusoidal signals are modulated, this process may cause changes in amplitude, frequency or phase of vibrations.
 

In the case of rectangular waves (often used in digital technology), the modulation process is subject to the width, amplitude, position (arrangement) and density of pulses. The frequency of changes caused by modulation is much lower than the wave frequency. An example is the modulated sound of a  variable frequency alarm siren. 

The modulation device is called the modulator. Demodulation (in other words: detection) is a process that is inverse to modulation. A device called a demodulator or detector reproduces a modulation signal from a modulated waveform.

If the communication has a two-sided character (eg full duplex), then one device modulates the transmitted signals simultaneously and demodulates those that it receives (modulator-demodulator, or in short a modem).

Modulation and modulators proposed by Thor Broadcast are necessary in virtually every AV set, especially in such, in which the computer is involved.

The signal used in them must be capable of transmission via the telecommunications network. Physical limitations cause information to be distorted due to noise, distortion and crosstalk from other signals sent in the same facility. Therefore, choosing a good Thor modulator is so important. The modulated message after overcoming all these obstacles must be so correct that the recipient can extract useful data from it.

All ThorBroadcast offered items are on acceptable price level.

There are 3 basic modulation techniques: 

  1. Analogue modulation of:
    • Amplitude;
    • Phase;
    • Delta-Sigma (ΔΣ).
  2. Pulse-Code:
    • PCM – Pulse-Code Modulation;
    • DPCM – Differential Pulse-Code Modulation;
    • PWM – Pulse-Width Modulation;
    • PAM – Pulse-Amplitude Modulation;
    • PPM – Pulse-Position Modulation;
    • PDM – Pulse-Density Modulation.
  3. Keying:
    • Amplitude Shift Keying - ASK
    • Quadrature Amplitude Modulation - QAM
    • Frequency-Shift Keying - FSK
      • Multiple Frequency-Shift Keying - MFSK
      • Gaussian Frequency Shift Keying - GFSK
      • Minimum Shift Keying - MSK
      • Gaussian Minimum Shift Keying - GMSK
    • Phase-Shift Keying – PSK;
    • Spread Spectrum Systems:
      • DSSS –Direct Sequence Spread Spectrum;
      • FHSS –Frequency Hopping Spread Spectrum;
      • Pulsed-FM;
      • OFDM – Orthogonal Frequency Division Multiplexing;
      • CDMA –Code Division Multiple Access.
    • RTTY –Radio TeleTYpe


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