AbstractA fixed formant filter for a digital electronic instrument of the type in which musical tones are generated from waveshape data calculated independently of frequency of the tone from constituent generalized Fourier components. The Fourier components are individually scaled by scale factors selected from a set of stored scale factors which define the transfer characteristic of the fixed formant filter. Each separately addressable stored scale factor corresponds to a different frequency value in the musical scale. A scale factor is selected for separately scaling each harmonic of the tone generated in response to the particular note of the musical scale keyed on the instrument. The selected scale factors may be modified by a frequency deviation signal to provide vibrato or other frequency modulation effects. The selected scale factors are also corrected for any frequency deviation between the actual frequency of the harmonic of the keyed note being scaled and the frequency value associated with the selected scale factor.ClaimsWhat is claimed is:1. A tone generator having a fixed formant filter characteristic for generating a tone having a pitch selected by operating a key on a keyboard comprising a harmonic counterfor counting the harmonic components of the tone being generated, means initiating a plurality of harmonic component calculation cycles, said means advancing the harmonic counter at the start of each calculation cycle, means storing a plurality ofharmonic coefficient values, means reading out a different coefficient value from the storing means with each advance of the harmonic counter, means storing a plurality of sinusoid values, means reading out a sequence of sinusoid values with each settingof the harmonic counter, adder-accumulator means, means multiplying the coefficient value for each harmonic calculation cycle with a sequence of sinusoid values and adding the product values to the adder-accumulator, addressable means storing a pluralityof scale factors corresponding to the relative amplitude values of the fixed formant filter characteristic at predetermined frequencies corresponding to the musical notes of the keyboard, means for addressing the addressable storage means in response tothe selected key on the keyboard and the state of the harmonic counter, means multiplying each of said product values added to the adder-accumulator by the associated scale factor read out of the storage means, and means converting each of the valuesstored in the adder-accumulator at the completion of said calculation cycles to an analog voltage in sequence at a rate determined by the pitch of the tone being generated, whereby the set of values stored in the adder-accumulator is converted to anaudio voltage signal having a fundamental frequency corresponding to the desired pitch of tone being generated, means for modifying the scale factor read out of the addressable scale factor storing means including means for generating the incrementaldifference between successive scale factors read out of the scale factor storing means, means generating a frequency deviation value, means multiplying said incremental difference by said deviation value, and means adding the content of the multiplyingmeans to the scale factor from the scale factor storing means.2. Apparatus of claim 1 wherein the means generating the frequency deviation value is varied as a function of time to produce a frequency modulation effect.3. Apparatus of claim 1 wherein the means generating a deviation value is controlled in response to the state of the harmonic counter.4. Apparatus of claim 1 wherein said means multiplying said incremental difference by said deviation value includes means providing a one bit right shift of said incremental difference, means providing a two bit right shift of said incrementaldifference, means providing the sum of the output from the one bit right shift means and the two bit right shift means, and means responsive to said deviation value for selecting any one or none of said outputs as input to said means adding the output ofthe multiplying means to the scale factor.5. A polyphonic digital tone synthesizer, comprising: a keyboard having keys for initiating one or more musical notes, a main register for storing a set of coded values corresponding to the relative amplitudes of a set of points defining onecycle of a periodic musical waveform, a digital-to-analog converter, means responsive to operation of a selected key for transferring the coded values in sequence from the main register to the converter at a rate proportional to the pitch of the noteinitiated by the selected key, means for computing the set of coded values and storing them in the main register including means storing a set of harmonic coefficients, means storing a set of orthogonal function values, means multiplying each harmoniccoefficient in succession with a set of orthogonal values to produce a succession of computed sets of values defining respectively each harmonic of the desired waveform, and means for adding the successive sets of values and accumulating the sums in themain register, addressable storage means storing at least one set of scale factors defining the gain characteristic of the fixed formant filter over the audio frequency range, means generating addresses for addressing the addressable storage meansincluding means generating a unique address for each key on the keyboard and means adding a unique incremental value to said address for each harmonic being computed, and means applying the scale factor addressed in said addressable storage means to saidscaler means to apply a different scale factor for each computed set of values defining each harmonic of the desired waveform, said means applying the scale factor including means for adjusting the scale factor read out of the addressable storage means,said adjusting means including means for providing the incremental difference between the scale factor read out of the storage means and the scale factor at the next successive address of the storage means, means for multiplying said incrementaldifference by a frequency deviation signal, and means for adding the output of the multiplying means to the scale factor read out of the storage means.6. Apparatus of claim 5 further including means for storing incremental adjustment factors corresponding to the difference between the scale factor stored in said addressable storage means and the actual scale factor for the correspondingfrequency point on the desired fixed filter characteristic curve, there being a separate adjustment factor for each harmonic, and means addressing the incre...
They say singers are on top of the star ladder; singing prowess promises a dreamer the hopes of making it big someday. Some of the world's most successful, not to mention the richest are those with ultimate star quality and those with ability to really belt it out and awe crowd with their singing talent. The ability to weave magic by difficult voice acrobatics never fails to serve as ticket to fame. Some say joining such contests will only give the contestants fifteen minutes to fame. That fame here is just short live...
I wonder if there would be so mh reverb in the dream world of a foetus. Youannot new tops in this Youannot reply to tops in this Youannot edit your in this Youannot delete your in this Youannot vote in polls in this Youannot atth files in this Youan download files in this Powered by phpBB opy; 2001, 2005 php...
index » lavia Nord Modular » Nord Modular G2 DiussionPlease support our site. If youlk through and buy from our affiliate partners, we earn a smallommission.It was tually in the middle of a gig aouple nights ago that my Nord Eltro spontaneously powered off. While the rest of the band played on, I toggled the power swih, and when the instrument rebooted, the two-digit display (whh typally shows "EL" and then "2.0" when starting up) showed "EL", the...
Hi,I was fiddling around with the demo today and fired upubase SX to see what would happen. I wasn't expting to be able to rord toubase with the demo having MIDI disabled e, but I wasn't able to startubase at all - I just got a message saying "ASIO already running" and I suspt that referred to the ...
Bk in the old days, the only sensiblehoe would be a rordingonsole.Truth be told, there were different flavors, but most tried to solve the problems with related to making a dent monitoring mix, assignonsolehannels to tape inputs and also provide sensible monitoring mixes for the musians. Bk in the 80s, after the first portastudioraze had settled down, Fostex and Taam sold reel to reel multitrks in big numbers. They also sold budget pred aled down rordingonsoles sie live oriented mixers weren´t suit...
Midi interfes? We have some threads here about those here somewhere.Here is one of them: eltro-musomtop-20161Aharity Pantomime in aid of Paranoid hizophrens deended intohaos yesterday when someone shouted, "He's behind you!" Mus at MySpe and Virb - index » Instruments and Equment » General Diuss...
index » lavia Nord Modular &ra...
Latest news on the Symar gig on April 20th.With only two weeks to go to this gig, disappointing news, unfort...
fonikJoined: Jun 07, 2006: 2003Lation: GermanyAudio files: 13i got my LM1036 from a small german e-store,an't remember quite now.here is a first sample just showing the pan. the kleeontrols two voes (EFM Os pit , SSM2044 & LPGutoff, LM1036 pan), baby10ontrols the klees base frequey (via quanti...
Archiv
TAGE
