HDR
Receiver support for
HDR technology; this clause may also specify the specific supported HDR format.
HDR stands for High Dynamic Range. This technology allows you to expand the range of brightness reproduced simultaneously on the screen; to put it simply, the viewer will see brighter whites and darker blacks. In practice, this means a significant improvement in color quality: colors are more vibrant and at the same time more faithful than without HDR. However, to use this function, in addition to the receiver, a TV/projector that supports the appropriate HDR format and content recorded in this format is required.
In terms of specific formats, the most popular options these days are basic HDR10, advanced HDR10+, and high-end
Dolby Vision. Here are their features:
- HDR10. Historically the first of the consumer HDR formats, less advanced than the options described below but extremely widespread. In particular, HDR10 is supported by almost all streaming services that provide HDR content at all, and it is also common for Blu-ray discs. Allows you to work with a color depth of 10 bits (hence the name). At the same time, devices of this format are also compatible with content in HDR10 +, although its quality will be limited by the capabilities of the original HDR10.
- HDR10+. Improved version of HDR10. With the same color depth (10 bits), it uses the so-called dynamic metadata,
...which allows transmitting information about the color depth not only for groups of several frames, but also for individual frames. This results in an additional improvement in color reproduction.
Dolby Vision. An advanced standard used particularly in professional cinematography. Allows you to achieve a color depth of 12 bits, uses the dynamic metadata described above, and also makes it possible to transmit two image options at once in one video stream - HDR and normal (SDR). At the same time, Dolby Vision is based on the same technology as HDR10, so in modern video technology this format is usually combined with HDR10 or HDR10+.HDMI version
HDMI interface version supported by the receiver. Usually, all HDMI connectors available in the device correspond to this version — both inputs (see above) and outputs (see below). Here are the current options:
— v 1.4. The oldest of the current versions, released in 2009. However, it supports 3D video capable of working with resolutions up to 4096x2160 at 24 fps, and in Full HD resolution, the frame rate can reach 120 fps. In addition to the original v.1.4, there are also improved modifications — v.1.4a and v.1.4b; they are similar in terms of basic features, in both cases the improvements affected mainly work with 3D content.
-v 2.0. Significant update to HDMI introduced in 2013. In this version, the maximum frame rate in 4K has increased to 60 fps, and the audio bandwidth has increased to 32 channels and 4 separate streams simultaneously. Also from the innovations, we can mention support for the ultra-wide format 21:9. In the v.2.0a update, HDR support was added to the interface capabilities, in v.2.0b this feature was improved and expanded.
— v 2.1. Despite the similarity in name to v.2.0, this version, released in 2017, was a very large-scale update. In particular, it added support for 8K and even 10K at speeds up to 120 fps, as well as further expanded the possibilities for working with HDR. Under this version, its own cable was released — HDMI Ultra High Speed, all v.2.1 features are available only when using cables of this standard,...although basic functions can be used with simpler cords.
Linear
The presence of a linear audio input on the front panel of the AV receiver.
The line interface is the main interface for transferring an analogue audio signal between audio system components. It can use different types of connectors, but most often classic RCA is installed on the front panel of the receiver. Another option is a 3.5 mm mini-jack; such a socket is useful for connecting portable equipment such as smartphones or pocket players. There are models equipped with both types of connectors. Anyway, the placement of the line input on the front panel will be especially convenient for connecting temporary sound sources that are not planned to be permanently connected to the receiver. For example, during a party, you can quickly connect a DJ console or a player with a selection of music to the system, and just as quickly disconnect the device at the end of the event.
Composite
The presence of a composite input on the front panel of the AV receiver.
A full-size composite interface is used to transmit video and audio signals in analogue format over three connectors; however, in this case, this term means only one connector — for video. For more information about this and the technical features of the composite input, see above. And on the front panel, this connector is installed for the same reasons as other interfaces — to provide additional convenience in connection.
