DSOUND
A distributed software synthesizer utilising dsound protocol for communicating controll voltages (cv), gate and audio signals.
Protocol
Signal flow
- Browser - WSMIDI -> DSA -DSPacket-> DSN 1 -DSPacket...n-> DSA -WSMIDI-> Browser
BROWSER
|
|via DSPacket over WS
|
DSA
|
|via DSPacket over UDP
|
|
-----DSN-VCO1--
\ ---DSN-MIXER---DSN-VCF---DSN-VCA---
---DSN-VCO2---/ |
DSA
|
---BROWSER
Inspiration
Localhost
LH represents the users local machine running the DS client SDK. It produces binary cv and gate signals from a hardware device such as MIDI keyboard.
DSnode
DSN reperesents a DSound Synthesizer node. It contains all software to act as a typical modular synth component interface for consuming and producing cv, gate and audio signals. It also takes care of helping IP address exchanges for components withing the system.
DSapp
DSA represents the website exposing a websocket interface for browsers to send MIDI messages to. The wesocket frames translate into UDP packages fot hole-punched transmission.
DSPacket
DSP contains MIDI or audio information as well as information third-party routing information such as a VCO on machine1 receiving a DSPacket will know that the generated audio output DSPacket be sent to machine2 and so on. It is utilising UDP, connection less and therefore exposed to be lost.
WS
WS is a DSpacket over websockets.
DSnode
Inputs
- MIDI realtime http://webaudio.github.io/web-midi-api
- MIDI from files
- CV/gate https://en.wikipedia.org/wiki/CV/gate
Input transformation
MIDI input signals are transformed to CV/gate signals at a variable samlpling frequency and bit depth.
- http://www.midikits.net/midi_analyser/midi_note_frequency.htm
- http://www.midikits.net/midi_analyser/midi_note_numbers_for_octaves.htm
- http://www.doepfer.de/a1922.htm
- http://www.doepfer.de/home_d.htm
CV
1 Volt per ocatve such as from A3 to A4 (C major): 3.000V - 3.167V - 3.250V - 3.417V - 3.583V - 4.000V
- CVN for midi note 0...+10V
- CVV for midi note 0...+5V
Gate
V-trigger meaning that 0 is off and 1 Volt is on. Pretty much simultating analog binary hence the somewhat odd transformation from Midi noteOn/Off events to quantized binary representing voltageswhci in turn get interpretted to swich the audio output on the DSN.