Project
Projecttitel:Juergen Haible Vocoder
Status: IN BUILD
Startdate: March 2016
Duedate: July 2016
Manufacture link: http://jhaible.com/legacy/vocoder/living_vocoder.html
The Filterbank funktion will have 3 modes:
1) On
The Filterbank will always be mixed with the vocoded sound, acording to how you set the Filterbank sliders.
2) Off
Basic Vocoder function
3) Silence Bridging
The Filterbank function will fade in when there is no speech. So there is always a coloured Excitation signal. While you speak, the colour is set by the speech. When you don't speak, the colour is set by the 20 Filterbank sliders. This allows a seamless blend of ariticulated and non-articulated sound.
You can set the threshold - how many dBs down the speech signal is, before the filterbank is engaged -, and the attack and release time of the filterbank fade in/out, with 3 potentiometers.
Capacitors
I have reduced the expensive, 1% capacitors to two values: 10nF and 47nF.
That way, you can buy them in larger quanities and they won't be that expensive.
You will need about 150 pieces of 47nF 1% and 150 pieces of 10nF 1%.
They are available at www.rs-components.de , order number 169-326 and 166-6421 (These are bags of 10 pieces.)
You'll need a lot of other capacitors as well, of course, butthese can be 5% tolerance - not so hard to source.
Component Overlay
living_vocoder_comp_overlay.pdf
BOM:
Schematics:
Speech Input Amplifier, Tone Control and Opto-Electronic Limiter (Tone Control Part inspired by ETI Vocoder)
Attack Detector (for Slew Time Symmetry) (Inspired by EMS 2000 Vocoder)
Voiced / Unvoiced Detector ("AC Hysteresis" function inspired by Sennheiser Vocoder)
Silence Bridging / Filterbank Control
Slew / Freeze(Inspired by EMS 2000 and 5000 Vocoder)
Synthesis Amp, Compander, Noise and S-Generator (Inspired by EMS 3000 Vocoder, ARP Quadra Phaser, and EMS VCS3)
Output Amplifier
Power Supply
Power Info from Juergen.H
Current measured on +12V and -12V was about 500mA each. This is without signal, and without channel LEDs.
Expect the current to stay below 1A (DC) with all LEDs turned on.
AC current (fuses after transformer) read 900mA each. Expect this to stay below 2A with LEDs and all.
So the 80W toroidal transformer (2 x 15V secondary) is slightly oversized, and exactly the right choice for thi sproject.Current measured on +12V and -12V was about 500mA each. This is without signal, and without channel LEDs.
Expect the current to stay below 1A (DC) with all LEDs turned on.
AC current (fuses after transformer) read 900mA each. Expect this to stay below 2A with LEDs and all.
So the 80W toroidal transformer (2 x 15V secondary) is slightly oversized, and exactly the right choice for thi sproject.Current measured on +12V and -12V was about 500mA each. This is without signal, and without channel LEDs.
Expect the current to stay below 1A (DC) with all LEDs turned on.
AC current (fuses after transformer) read 900mA each. Expect this to stay below 2A with LEDs and all.
So the 80W toroidal transformer (2 x 15V secondary) is slightly oversized, and exactly the right choice for thi sproject.Current measured on +12V and -12V was about 500mA each. This is without signal, and without channel LEDs.
Expect the current to stay below 1A (DC) with all LEDs turned on.
AC current (fuses after transformer) read 900mA each. Expect this to stay below 2A with LEDs and all.
So the 80W toroidal transformer (2 x 15V secondary) is slightly oversized, and exactly the right choice for thi sproject.
Current measured on +12V and -12V was about 500mA each. This is without signal, and without channel LEDs.
Expect the current to stay below 1A (DC) with all LEDs turned on.
AC current (fuses after transformer) read 900mA each. Expect this to stay below 2A with LEDs and all.
So the 80W toroidal transformer (2 x 15V secondary) is slightly oversized, and exactly the right choice for thi sproject.Current measured on +12V and -12V was about 500mA each. This is without signal, and without channel LEDs.
Expect the current to stay below 1A (DC) with all LEDs turned on.
AC current (fuses after transformer) read 900mA each. Expect this to stay below 2A with LEDs and all.
So the 80W toroidal transformer (2 x 15V secondary) is slightly oversized, and exactly the right choice for thi sproject.Current measured on +12V and -12V was about 500mA each. This is without signal, and without channel LEDs.
Expect the current to stay below 1A (DC) with all LEDs turned on.
AC current (fuses after transformer) read 900mA each. Expect this to stay below 2A with LEDs and all.
So the 80W toroidal transformer (2 x 15V secondary) is slightly oversized, and exactly the right choice for thi sproject.
Current measured on +12V and -12V was about 500mA each. This is without signal, and without channel LEDs.
Expect the current to stay below 1A (DC) with all LEDs turned on.
AC current (fuses after transformer) read 900mA each. Expect this to stay below 2A with LEDs and all.
So the 80W toroidal transformer (2 x 15V secondary) is slightly oversized, and exactly the right choice for thi sproject.Current measured on +12V and -12V was about 500mA each. This is without signal, and without channel LEDs.
Expect the current to stay below 1A (DC) with all LEDs turned on.
AC current (fuses after transformer) read 900mA each. Expect this to stay below 2A with LEDs and all.
So the 80W toroidal transformer (2 x 15V secondary) is slightly oversized, and exactly the right choice for thi sproject.
Current measured on +12V and -12V was about 500mA each. This is without signal, and without channel LEDs.
Expect the current to stay below 1A (DC) with all LEDs turned on.
AC current (fuses after transformer) read 900mA each. Expect this to stay below 2A with LEDs and all.
So the 80W toroidal transformer (2 x 15V secondary) is slightly oversized, and exactly the right choice for thi sproject.