Broadcast Encoder

Best Broadcast Encoders

Choosing right broadcast encoder is very important, since those devices affect both picture quality and the functionality to support the total broadcast system. Careful research is necessary to ensure proper functionality prior to selecting an appropriate unit. Therefore, we encourage you to do your homework, we'll help assist with some pointers.

Best Broadcast Encoders. 
Here you can acquaint yourself with a few very good products from the Thor portfolio at various price points:

This Device is a 8 HDMI Encoder H.264 & AC/3 Audio IP and ASI. This Unit is a Real Time Encoder for 8 HDMI inputs on ASI or IP outputs.

Features

  • Real Time H.264 Hardware Encoder with 8 HDMI Inputs
  • Independent control for encoding parameters on each channel
  • Provides all programs as MPTS outputs on both ASI and IP
  • Provides single program IP streams as  8 SPTS's  IP Output over UPD/RT/RTSP
  • Includes ASI input for multiplexing an additional ASI program
This Device Encodes 8 SDI Video and Audio to IP and ASI. Includes an ASI input for multiplexing an SPTS program with the outputs.

Features

  • ,H-4HD-EMSReal Time H.264 Hardware Encoder with 8 HD-SDI Inputs
  • Independent control for encoding parameters on each channel
  • Provides all programs as MPTS outputs on both ASI and IP
  • Provides single program IP streams as SPTS IP Outputs over UDP/RRTP/RTSP
  • Includes ASI input for multiplexing an additional ASI program
  • Unit do not support CC ,only 1,2,and 4ch SDI unit supports it H-4HD-EMS ,H-2HD-EMS ,H-1HD-EMS

Accepts up to 4 channels of uncompressed HD-SDI digital video on 4 BNC connectors.

Features

  • Real Time MPEG-2/H.264 Encoder with Low Latency option
  • Independent control for encoding parameters on each channel
  • Supports 608 & 708 Closed Captioning Standards
  • Supports Dolby AC/3 audio codec for compliance with US TVs
  •  Designed to easily add 4 additional channels to a QAM-IP
  • Stream IP Out :1x MPTS and4x SPTS  over UDP, RTP/RTSP our (RJ45, 100M)
  • Stream ASI Out; 2 x ASI mirrored Out

Accept up to 4 channels of uncompressed HDMI digital video on 4 inputs

Features

  • Real-Time MPEG-2/H.264 Encoder with Low Latency option
  • Independent control for encoding parameters on each channel
  • Supports Dolby AC/3 audio codec for compliance with US TVs
  • Designed to easily add 4 additional channels to a QAM-IP
  • Redundant hot standby power supply for highest reliability
  • Ip Stream Out: 1x MPTS and 4x SPTS  over UDP, RTP/RTSP our (RJ45, 100M)

A multiformat multi-input 1 video 8 Audio hardware encoder for the broadcast industry. Based on the advanced Thor Web Management system

Features

  • Real Time HD Encoder for both MPEG-2 and H.264 program creation
  • Based on the advanced Thor Web Management system
  • Supports MPEG-1 Layer II, HE-AAC (v1&v2), LC-AAC, DD AC3 (2.0, 5.1 available); codecs
  • Supports Dolby  AC3 (2.0, 5.1) audio passthrough on SDI
  • Supports both EIA 608 and 708 Closed Caption systems

What are broadcast encoders for?

Encoders are used to translate rotary or linear motion into a digital signals. This is for the purpose of monitoring or controlling motion parameters, such as speed, rate, direction, distance or position.

How do the encoders work

The encoder is a combinational logic circuit that converts an active input signal into a coded output signal. It has n input lines, only one of which is active at a time and m output lines. It encodes one of the active inputs to a coded binary output with m bits. The number of output lines is smaller than the number of inputs.

Encoding vs transcoding

First things first, you should think of what purpose or content you will need to encode with your device. In the market we can find both encoders and transcoders, but what is the difference? Encoding takes analog source content and converts it to a digital format, such as converting your old family video films to DVD. In contrast, transcoding takes an existing digital format and converts it to a different digital format. 

Decoders

There are also decoders, which perform the opposite function than encoders. Encoders convert 2N lines of input into a code of N bits and decoders decode the N bits into 2N lines. Decoders can be used for obtaining the required data from the code or for obtaining the parallel data from the serial data received. A decoder is similar to a demultiplexer, however it has no select inputs.

Difference between encoder and multiplexer

A multiplexer takes in one of the several inputs and sends to the output. An encoder takes in all the 1s from every input and codes them into an output. A multiplexer is known as a data selector since it simply selects the data and sends it to the output. An encoder just codes the data. A multiplexer has n inputs and one output, whereas encoders have 2^n inputs and n outputs. Multiplexers find applications in communication channels, when encoders find them in compression of information for transmission or storage and for encryption.

Priority encoders

Priority encoders give a coded output by assigning a priority to the bits of input. The lower priority bits’ values don’t matter - if the higher priority bit is high, then the output will be generated depending on the high bit’s position. The outputs are the same as in normal encoder, but the range of inputs is higher since the output depends only on the highest priority bit. Priority encoders are great at handling interrupt requests for a microprocessor.

Application of the broadcast encoders

The broadcast market for encoders in digital transmission has been developing since the introduction of linear video codecs in the beginning of the 1990s. It started with contribution and primary distribution systems for in-studio/production-to-studio applications and continued on to studio and transmitter locations. The efficiency of encoders increased dramatically during this time, and this has contributed to the success of new formats, such as HDTV and compression standards, such as H.264. Nowadays the need for encoders in broadcast environments can be divided into three main areas: contribution, primary distribution and distribution-to-the-home.

Which features should a good encoder have

One of the most vital features is low latency. Video latency refers to the amount of time it takes for a video signal to be transmitted from one place to another, sometimes also referred to as delay. Delay can completely ruin exchanges between even the most expert broadcast professionals and can be unworkable for untrained participants. This feature is very important, for example, while doing interviews. It is also important for the encoder to be able to adapt to network conditions in order to ensure that video streaming will not fail under any circumstances.



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