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Bitspeek is a pitch-excited linear prediction codec effect. It takes audio input, breaks it down into synthesizer parameters and reproduces the sound using an oscillator, noise and a formant filter.

Despite having only a few simple controls, this box can produce a broad range of sounds from cheap speaking toys to high-end vocoder and talkbox effects.

Bitspeek was created by Magnus Lidström, the man behind Malström.

  • Category: Creative FX
  • Released: 2012-10-04
  • Version: 1.0.1
  • Rating: 3.4

Product details

Bitspeek is a real-time pitch-excited linear prediction codec effect. Right now you are probably thinking, "oh, another one of those"? Or perhaps not. Chances are that you have never heard about "linear prediction", although most of us use it daily when we talk on our cell phones. Linear prediction coding is a voice compression technology that appeared in commercial products in the seventies and was implemented in some well-known speaking toys of the early eighties.

We have used this technology to create an audio effect that analyzes audio, extracts a number of parameters (including pitch, volume and formant data) and then resynthesizes the audio using an oscillator, noise and a formant filter. A number of playback parameters can adjust the pitch and tonal quality of the sound. It is possible to play the pitch with MIDI notes and you can create tempo-synchronized "formant freezing effects".

The Rack Extension version of Bitspeek is more advanced than the current AU/VST counterpart. It includes a lot of improvement such as:

 Stereo analysis and resynthesis. The stereo image (pan and width) of the incoming audio is analyzed and resynthesized.   Improved volume tracking algorithm with much better transient response and consistency across source material and sample-rates.   External audio input allows you to use the formant filter on any material.   Lots of CV ins and outs for integrating into your rack and scoring high on geekness factor.

Bitspeek ships with a selection of Combinator patches that demonstrates the possibilities with the extra inputs and outputs.

Download full Bitspeek RE User Guide here: