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P a g e

IOM Motomouth 2017 rev 5
www.limaflo.com

OPERATING MANUAL

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Содержание Motomouth

Страница 1: ...1 P a g e IOM Motomouth 2017 rev 5 www limaflo com OPERATING MANUAL ...

Страница 2: ...sformer DO NOT power with 12 or 24 VAC power This is alternating current and it could stress the internal capacitors and or create hum Operating DO NOT operate in the rain or in very damp conditions keep Motomouth dry You won t get electrocuted but galvanic corrosion may take place if powered and the PCB is wet Operate at between 10 o C to 40 o C 95 Relative humidity non condensing i e no dew This...

Страница 3: ... consider how you would use you own voice box and mouthing as many vowels as you can over a few minutes using a monotone voice would also have the same outcome for any listener If you realise this then you will quickly become an expert at using Formant Filtering Thank you Ren Designer and creator of Motomouth A big thank you to Patrick Schisler and John Jacobs for ideas proof reading and assistanc...

Страница 4: ... frequencies to mimic the resonance changes in the mouth cavity when forming the different vowels A third bandpass filter F3 is preferably added to introduce the nasal chamber but it s generally kept static The 3 bands F1 F2 and F3 Sedra Espinoza BP Filter The Sedra Espinoza filter design often known as a Dual Amplifier Bandpass DABP filter is perfect for formant filters because the gain at any qu...

Страница 5: ...5 P a g e IOM Motomouth 2017 rev 5 www limaflo com BLOCK DIAGRAM ...

Страница 6: ...0 pin power connector is on the bottom right as seen in illustration 250mm 10 pin Module 16 pin Rack power bus Red line denotes Minus Twelve 12 Volt end 10 pin header 12V 12V 0V Red line at the bottom Connected Correct orientation to connect to the rack s power bus If you have this connected the wrong way round no damage will occur the module simply won t operate When correctly powered the RED LED...

Страница 7: ...ble distortion clipping and you can t attenuate the incoming signal in any way then the trimmer shown below can be turned anti clockwise counter clockwise gradually until the distortion disappears Should you need to use audio Line levels 4 5 V p p or less typically 1 7V and you require higher output levels then the trimmer can be turned fully clockwise but remember the initial trimmer position so ...

Страница 8: ...dule or perhaps a mixed noise source Using a separate VCA train allows you to activate the sound when required and not have it running continuously However you will soon find your own way to connect and use Motomouth and the various forums may be a good platform to share discuss set ups and patching that s part of the attraction However to get things started here is a basic patch with some options...

Страница 9: ...perating modes Filter F1 F2 and F3 Mixed audio output mono See block diagram Source audio input Up to 10 Vp p Blue LED Vowel code for vowels 1 16 is coded in Binary LSB at the top In VCF mode it simply sweeps in dot mode up and down through the frequencies low at the bottom high at the top Manual adjustment of the Vowel selection or the filter sweep This is inactivated with a CV control Jack inser...

Страница 10: ...hen one key is pressed the gate is ON when the key is released the gate is OFF However when one note is pressed the gate is ON and if another note is pressed without releasing the first note the gate remains ON So you can see that the envelopes will not be retriggered and it remains at the Sustain point in the envelope for this type of transition This is a particularly useful method for adding exp...

Страница 11: ...ased and attenuated LFO it is not necessary to do so You can play the notes to glide though the filter range or you can play two notes where you want the filter to span and add portamento or add some Morph time in using he Morph control knob This way you can play the filter in a more musical way Using the F1 or F2 morph switch to turn the morph off for F1 or F2 can also get some interesting result...

Страница 12: ...e ramp rate is governed by the Morph Potentiometer value The discharge means you then snap to the exact input voltage applied at that time which is the intended vowel or filter F target It s complicated to describe the function but the effect is useable in both Vowel and Filter VCF Modes This can be applied for some very usable effects GATE or Trigger Internal Pulse LED Flickers yellow Rising edge...

Страница 13: ...tion is read from the LEDs 2 The CV voltage setting is not as critical as it is for note tuning and there is some dead band between the vowels so that aliasing jitter between vowels is eliminated It is quite easy to set up vowels using a span of 0 5V and even possible with a span of 0 12V A span of 0 2V is preferred and a span of 0 1 25V is perfect On Blue Off FILTER MODE LEDS Low f High f VOWEL C...

Страница 14: ... Descending mV mV mV 1 0 0 39 2 63 83 125 3 148 166 212 4 231 250 295 5 315 333 379 6 396 416 458 7 481 500 540 8 564 583 627 9 652 666 714 10 738 750 795 11 820 833 879 12 901 916 964 13 987 1000 1046 14 1072 1083 1133 15 1154 1166 1205 16 1237 1250 1250 Keyboard range ALL Notes above D remain the same C to D 0 1 25V 16 semitones ...

Страница 15: ... Volts per octave Therefore you may have to use the octave selection button to find where the active CV range begins and ends but this will always be from 0 V to 1 25 V in real input voltage terms for Motomouth and it still uses the 1V octave standard i e 83 33 mV semitone F1 bottom and F2 top frequency plot against note number or voltage Note 1 0V note 16 1 25V 0 500 1000 1500 2000 2500 3000 0 5 ...

Страница 16: ... try not to over repeat 2 Change the pitch and bend notes Changing the pitch and bending portamento glissando some occasional notes is how we speak and sing So for interesting sounds not just for speech it s great to add some note changes and or bends 3 Chose the best input and keep it low A saw tooth wave closest resembles a human voice box but you can enhance this by adding in some more High Fre...

Страница 17: ...en useful as a substitution transition vowel one type of vowel inserted between the first and last vowel which can make a difference to the accent or pronunciation of the phrase 8 Try not to fast transition vowels through a signal step point i e avoid the Blip Changing resonant oscillation frequency mid flight is and is heard as distortion and it s at that same frequency as the change in other wor...

Страница 18: ... features Of course speech is not all that Motomouth can do you can make it sound like a modem or a telecom component add some initial attack resonance to a 24 dB Oct LP filtered bass line or even keep it static to obtain that perfect timbre that works best for that mix ...

Страница 19: ... Vowel 16 12 Volt tolerant CV Input Filter Mode 0 Volts to 1 25 Volts 200 Hz 1 25V to 2 kHz 0V respectively 12 Volt tolerant Gate voltage 0V OFF 2 5V 5V ON 2 5V to 12V 12 Volt tolerant Input sensitivity 0 1 Vp p to 10 Vp p 12 Volt tolerant Output 10V p p max depending on resonance Short circuit tolerant Filters 3 x classic Sedra Espinoza Dual Amplifier Bandpass Filters with Q s set to between 5 an...

Страница 20: ...olytic capacitor and a 100nF ceramic capacitor where this is further blocked by the incoming linear regulator which is tantalum capacitor decoupled 10uF All PCB trace designs and decoupling for each component is followed in accordance with the manufacturer s recommendations The PCB comprises segregated digital and analogue ground plains connected in a star topology Purpose Motomouth is classified ...

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