Virtual Audio Cable is a software product based on
WDM multimedia driver that allows a user to transfer
audio streams from one application to another. Any application is able to send an audio stream to the input side of a "virtual cable" while a corresponding application can receive this stream from the output side. Since all transfers are made digitally, there is no loss in sound quality. VAC is the audio equivalent of a
MIDI
Musical Instrument Digital Interface (; MIDI) is an American-Japanese technical standard that describes a communication protocol, digital interface, and electrical connectors that connect a wide variety of electronic musical instruments, ...
loopback device such as MultiMid or Hubi, and can be used instead of
"Stereo Mix" or "What U Hear" features of
audio adapters.
If more than one application is sending audio through an output virtual cable, VAC is able to mix all of the streams together or create separate corresponding virtual input cables. Similarly, more than one application is able to receive audio from an input cable, whether it's sharing the same audio data with another target or receiving its own personal audio stream.
[VAC UK](_blank)
software-dungeon.co.uk. Retrieved August 2011 VAC is useful for recording an application's audio output in almost real time or transferring a sound stream to another application so it may process it. A person could use two or more software audio generators, synthesizers or sequencers to produce audio streams and send them to a VAC output cable and record the mixed stream from the VAC input cable using any type of recording software.
Because VAC routes audio streams in almost
real time, it is able to be utilized in various manners. A person is capable of using VAC to record an output audio stream from an application that normally does not allow saving the audio to files. Practically, the input port records the audio signal (for example from a music player) and sends it to the destination program (such as a sound processor or analyzer) using the output port. A user could also manipulate VAC into recording conversations through
Voice Over IP
Voice over Internet Protocol (VoIP), also known as IP telephony, is a set of technologies used primarily for voice communication sessions over Internet Protocol (IP) networks, such as the Internet. VoIP enables voice calls to be transmitted as ...
(VoIP) or
Internet telephony
Voice over Internet Protocol (VoIP), also known as IP telephony, is a set of technologies used primarily for voice communication sessions over Internet Protocol (IP) networks, such as the Internet. VoIP enables voice calls to be transmitted as ...
applications such as
Skype
Skype () was a proprietary telecommunications application operated by Skype Technologies, a division of Microsoft, best known for IP-based videotelephony, videoconferencing and voice calls. It also had instant messaging, file transfer, ...
(for example, with SAM Broadcaster
), produce live audio podcasts,
redirect audio channels to multiple monitors,
or even decode weather faxes.
Features
*Windows XP/2003/Vista/7/8/8.1/10/11 platforms (x86, x64 and arm64)
*Native
WDM/
KS audio technology
*Up 256 Virtual Cables (Windows limits the number of
Multimedia Extensions devices to 32)
*1..20
millisecond
A millisecond (from '' milli-'' and second; symbol: ms) is a unit of time in the International System of Units equal to one thousandth (0.001 or 10−3 or 1/1000) of a second or 1000 microseconds.
A millisecond is to one second, as one second i ...
s per timer event (formerly interrupt)
*1..100 pin instances
*Supports almost any of
fixed-point PCM
Pulse-code modulation (PCM) is a method used to Digital signal (signal processing), digitally represent analog signals. It is the standard form of digital audio in computers, compact discs, digital telephony and other digital audio application ...
audio format
An audio format is a medium for sound recording and reproduction. The term is applied to both the physical recording media and the recording formats of the audio frequency, audio content—in computer science it is often limited to the audio file ...
s (
Floating-point
In computing, floating-point arithmetic (FP) is arithmetic on subsets of real numbers formed by a ''significand'' (a Sign (mathematics), signed sequence of a fixed number of digits in some Radix, base) multiplied by an integer power of that ba ...
formats are not supported)
*Low sound latency with maximal interrupt frequency (1000
Hz, 1 ms period).
*Unlimited number of
Kernel Streaming clients connected to each port
*RT Audio (WaveRT) protocol support with notification events, packet mode, clock and position registers. Clock registers are bound to Virtual Cables so all streams in each cable are coherent.
*Signal mixing between output port clients
*PCM format conversion
*Volume control features
*Clock correction features to reduce or totally eliminate clock rate difference effects
*Channel scattering/gathering mode
*Control Panel application to dynamically configure cables
References
External links
* {{Official website, https://vac.muzychenko.net
Digital audio
Audio software
Audio format converters
Audio mixing software
Audio recording software
Windows-only proprietary software