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PulseAudio operational flow chart PulseAudio is a daemon that does mixing in software. In broad terms ALSA is a kernel subsystem that provides the sound hardware driver, and PulseAudio is the interface engine between applications and ALSA. However, its use is not mandatory and audio can still be played and mixed together without PulseAudio.
ALSA is part of the Linux kernel, while PulseAudio is middleware, a part of the lower levels of the desktop stack. So is SDL . Advanced Linux Sound Architecture ( ALSA ) is a software framework and part of the Linux kernel that provides an application programming interface (API) for sound card device drivers .
Linear pulse-code modulation (LPCM, generally only described as PCM) is the format for uncompressed audio in media files and it is also the standard for CD-DA; note that in computers, LPCM is usually stored in container formats such as WAV, AIFF, or AU, or as raw audio format, although not technically necessary.
A goal of the project was to improve handling of video on Linux in the same way that PulseAudio improved handling of audio. [ 2 ] Although a separate project from PulseAudio, Taymans initially considered using the name "PulseVideo" for the new project. [ 2 ]
Pulse-code modulation (PCM) is a method used to digitally represent analog signals.It is the standard form of digital audio in computers, compact discs, digital telephony and other digital audio applications.
Lennart Poettering (born 15 October 1980) is a German software engineer working for Microsoft and the original author of PulseAudio, Avahi and systemd. Life and career
systemd is a software suite that provides an array of system components for Linux [7] operating systems. The main aim is to unify service configuration and behavior across Linux distributions. [8]
Audio mixing is the process by which multiple sounds are combined into one or more audio channels.In the process, a source's volume level, frequency content, dynamics, and panoramic position are manipulated or enhanced.