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IRext Encoding and Decoding Core Library ## IRext Encoding and Decoding Core Library
This project contains IRext core encode algorithm and decode algorithm. This project contains IRext core encode algorithm and decode algorithm.
Summary #### Summary
IR code is base on 38000Hz or 56000Hz carrier waves, it is identified by the time interval of carrier waves. IR code is base on 38000Hz or 56000Hz carrier waves, it is identified by the time interval of carrier waves.
Identical control signal is defined by pairs of physical high and low levels, eg. the NEC encoding bits as below : Identical control signal is defined by pairs of physical high and low levels.
(image of IR code) The lead code is identified by the 9000us time interval with carrier waves and 4500us interval without carrier waves. The logic 0 is identified by 500us time interval with carrier waves and 500us interval without carrier waves. The logic 1 is identified by 500us time interval with carrier waves and 1500us interval without carrier waves, so are the other types of encoding.
The lead code is identified by the 9000us time interval with carrier waves and 4500us interval without carrier waves. The logic 0 is identified by 500us time interval with carrier waves and 500us interval without carrier waves. The logic 1 is identified by 500us time interval with carrier waves and 1500us interval without carrier waves, so are the other types of encoding.
Following are some specifications: Following are some specifications:
@@ -30,26 +28,26 @@ Following are some specifications:
- Command code: The receiver receives IR code as commands from emitter, and then adjusts status of itself, eg. control code of TV, DVD. - Command code: The receiver receives IR code as commands from emitter, and then adjusts status of itself, eg. control code of TV, DVD.
- Status code: The receiver receives IR code as status, and applies itself to this status, eg. control code of air conditioner. - Status code: The receiver receives IR code as status, and applies itself to this status, eg. control code of air conditioner.
Encoder #### Encoder
The encoder composes compressed remote control IR binaries from plain text in XML format. Different kind of remote control code are differently composed. The encoder composes compressed remote control IR binaries from plain text in XML format. Different kind of remote control code are differently composed.
Command code __Command code__
Command code is composed by 2 parts : protocol segment and control segment which are stored in 2 parts. When encode, the remote control key code would be calculated and translated according to protocol definition and merge separate segments into a complete control frame. Command code is composed by 2 parts : protocol segment and control segment which are stored in 2 parts. When encode, the remote control key code would be calculated and translated according to protocol definition and merge separate segments into a complete control frame.
Status code __Status code__
Status code is defined by various kinds of tags, indication each essential part in one status control frame. It is especially used for air conditioners. Status code is defined by various kinds of tags, indication each essential part in one status control frame. It is especially used for air conditioners.
Decoder #### Decoder
The decoder decodes IR remote control binaries into IR control frame which is composed by time series illustrated above. The decoder decodes IR remote control binaries into IR control frame which is composed by time series illustrated above.
The input of decode algorithm is the IR remote control binary file or its content in bytes, the keycode and category id get from indexing API. The input of decode algorithm is the IR remote control binary file or its content in bytes, the keycode and category id get from indexing API.
The output of the algorithm is the time series, which can be sent to IR emit driver function to send IR control waves to the family equipment. The output of the algorithm is the time series, which can be sent to IR emit driver function to send IR control waves to the family equipment.
Please refer to https://irext.net/doc/ for details. Please refer to https://irext.net/doc/ for details.