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Index

5

Vocodizer

Contents

Controls

Volume: Controls the Vocodizer’s basic
volume level.

To be able to produce very narrow
filter settings while retaining
sufficient output level, the Vocodizer
amplifies signals internally by up to
24dB. In most cases you will not find
it necessary to adjust this control.

MIDI: Specify the MIDI channel on which
the vocoder and synthesizer should
respond to MIDI messages.

Level Meter

The Vocodizer’s level meters are located
in the upper left side of the main window.
Use these meters to monitor the input
levels of the source and synthesis signals,
and the level of the output. Well regulated
signals are important for optimal results.

Margin: Displays the highest signal level
reached so far. Use the Margin Reset
button to set the margin display back to
0.

Routing Text: Select the signal sources
to which the analysis and synthesis inputs
of the Vocodizer are connected by clicking
(left mouse button) on the appropriate field
and selecting one of Slot 1/2/3/4, Analog
or USB.

Margin Reset

Routing Text

Voiced/Unvoiced Detection

Summary of Contents for Noah Vocodizer

Page 1: ... does a Vocoder actually work Controls Level Meter Voiced Unvoiced Detection Input Analysis Input Synthesis Input Unvoiced Source Analysis Filter Section FilterWidth Section FilterMix The Frequency Calculator The Matrix MainTable of Contents Tactive Instrument Modeller ...

Page 2: ... to any desired signal source Typically the analog input or a USB audio input is used as the analysis source while the synthesizer input is connected to a synthesizer in one of the parallel slots Naturally an external synthesizer for example brought in via a USB audio input is also possible as a signal source for the synthesis input If you don t want the analysis signal or the synthesis signal its...

Page 3: ... time you loaded a new preset the process would be unnecessarily clumsy Settings not stored in presets include all Voiced Unvoiced Detection Analysis Synthesis Input gains Input Insert Effects Solo Voiced Source and Master Insert Effects These settings are stored in the Multi so that your setup will be restored exactly the next time you load it FilterMix These presets store the filter settings Alo...

Page 4: ...are later applied to an identically tuned filter bank in the synthesis section and used to process a secnd synthesized signal or it could be an entirely unrelated external input signal In both filter sections the filters are divided into an equal number of frequency bands After the analysis phase the vocoder examines each individual analysis filter output with an envelope follower to extract dynam...

Page 5: ...er s level meters are located in the upper left side of the main window Use these meters to monitor the input levels of the source and synthesis signals and the level of the output Well regulated signals are important for optimal results Margin Displays the highest signal level reached so far Use the Margin Reset button to set the margin display back to 0 Routing Text Select the signal sources to ...

Page 6: ...on The Vocodizer interprets this signal to be unvoiced With the same settings the detection circuit now encounters a spoken k sound As before the high frequency component is determined to be sufficiently high in energy to qualify it as an unvoiced signal But this time there is also enough tonal energy in the low frequencies to override the initial determination and the Vocodizer interprets the sig...

Page 7: ...the output And as you would expect setting this parameter to maximum results in the entire signal being identified as unvoiced In this case the noise source replaces the entire signal Hyst Hysteresis describes the difference in threshold values for the upper and lower frequency ranges At 0 the same level criterion applies to both ranges With increasing hysteresis values less energy is required in ...

Page 8: ...lts Note that changes to the input gain have an influence on the voiced unvoiced detection process Usually you will also have to adjust the Threshold setting after you change the gain control setting Synthesis Input Here you ajust the level of the synthesis input signal with amplification of up to 24dB Use the level meters to help set the correct level Again pay close attention to the level especi...

Page 9: ...ss band pass and high pass In each case the parameters are the same Att Attack Adjusts the rate with which the Envelope Follower responds to rising signal levels Rel Release Adjusts the rate with which the Envelope Follower responds to falling signal levels Gain Adjusts the output level of the Envelope Follower signals When you adjust the gain you are indirectly controlling the overall weighting o...

Page 10: ...ol of the vocoder effect is possible The Frequency Calculator To open the Frequency Calculator click the Tool icon in the Page selector area This dialog lets you adjust the frequencies of all the filters by specifying a base frequency and a factor Lowest Frequency Specify the base frequency here The low pass filter is given this value as its cutoff frequency For the band pass filters to start at a...

Page 11: ...f effects from sim ple formant displacement to a complete inversion of the filter assignments You can also change the frequencies of individual filters in the Matrix However note that each analysis and synthesis filter pair is always adjusted to the same frequencie Randomize Click here to establish random assignments of the analysis section to the synthesizer section Use this to experiment with co...

Page 12: ...rMix Section 10 Frequency Calculator 10 G Gain 9 H Hyst 7 Hysteresis 7 I InGain 8 Input 9 Input Section 8 Introduction 2 L Level 9 Link 9 LowCut 9 Lowest Frequency 10 M Margin 5 Margin Reset 5 Matrix 3 11 maximum 10 Meter Section 5 MIDI 5 Multiplier 10 P Presets 3 R Randomize 11 Rel Release 9 Routing Text 5 S S sounds 4 signature 4 Solo 8 Standard Mode Type off 6 Synthesis Input 8 T talking synthe...

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