Codec - definition
Codec - definition
A Codecode (compressor-decompressor or coder-decoder) is a circuit or algorithm used to transform analogue or digital data in order to encode (compression) and decode (decompress) or convert it between different signal formats. The main purpose of using codecs is to reduce the volume of data while keeping the signal quality as high as possible, and to enable the transmission, storage and playback of multimedia content in a limited bandwidth or memory space.
Depending on the application, codecs can operate in the audio, video, image or general data domain. In the context of an audio signal, a codec converts audio from analogue to digital form (and vice versa) and performs lossy compression or lossless compression. In the case of video, the codec analyses frame sequences to remove spatial and temporal redundancy, enabling efficient coding of visual streams. Compression can be implemented using mathematical transforms, quantisation and inter-frame prediction, as in popular standards such as H.264, H.265 or AV1.
Codecs can be implemented both as hardware solutions (e.g. Integrated circuits DSP or SoC) and software solutions (libraries, multimedia applications, operating systems). Their choice depends on the application requirements, such as transmission quality, delay, computing power or compliance with a specific standard. In digital communication and data transmission, codecs also enable the conversion of binary signals into a form suitable for transmission over a specific transmission channel, while maintaining consistency and fault tolerance.
From a multimedia systems engineering point of view, the codec is a key component of the signal processing chain - its properties determine compression efficiency, playback quality and compatibility between devices and file formats. This requires the consideration of parameters such as bitrate, compression ratio, information loss and speed, which are important in mobile applications, streaming, video conferencing and data archiving.
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