VOC is an audio file category format. File format VOC (or Creative Labs Audio File) was created by Creative Labs. Creative Labs was involved in the development of the audio file format in order to store and transfer audio data for its 8-bit and then 16-bit Sound Blaster sound cards. The format is a sound effect, sound clip and instrumental sound, referred to as a voice. To reduce the size, VOC files are compressed. Since this format has already been thoroughly investigated, its file structures have already been described in detail. A .voc file is a digital audio file in VOC format. In the title, it can be easily identified by the text line “Creative Voice File”. The file includes a header, as well as one or more blocks of audio data. Due to PCM / ADPCM audio encoding, VOC files can be easily converted to WAV format. VOC audio files can be played by several universal multimedia players. Sound editors import them. Using many utility converters, you can convert other audio formats to WAV. In many cases, the .voc file type becomes associated with some kind of multimedia processor that is installed on the system.
3GA is a 3GPP audio file created in 1998. It was created by the 3rd Generation Partnership Project. It is used mainly on mobile devices in order to record, play and transmit audio data. 3GPP (3rd Generation Partnership Project) is a consortium that develops specifications for mobile telephony. The format resembles 3GP files, however, it includes only audio data. In most cases, 3GA files are used by mobile phones in order to record and transmit audio data. For example, this is how audio is recorded in Samsung Galaxy phones. The .3GA file extension can be changed to .3GP, which is widespread. Everything is supported by many programs. The 3GA format uses an adaptive coding audio codec with variable speed (AMR, AMR-NB, GSM-AMR). The development of this codec was done in order to compress encoded speech signals using adaptive modulation. In 1999, the 3GPP consortium adopted the Adaptive Variable Rate Coding (AMR) standard. Currently, it is used by GSM and UMTS communication systems. It is this format for speech recording that has found wide application on mobile devices. We note at the same time that it is not possible to play such files very often on certain devices.