DE102009014655A1 - Musical instruments digital interface data interpolation method for e.g. piano, involves interpolating intermediate values between discrete data values arriving sequentially at arbitrary time under influence of frequency size, by filter - Google Patents
Musical instruments digital interface data interpolation method for e.g. piano, involves interpolating intermediate values between discrete data values arriving sequentially at arbitrary time under influence of frequency size, by filter Download PDFInfo
- Publication number
- DE102009014655A1 DE102009014655A1 DE200910014655 DE102009014655A DE102009014655A1 DE 102009014655 A1 DE102009014655 A1 DE 102009014655A1 DE 200910014655 DE200910014655 DE 200910014655 DE 102009014655 A DE102009014655 A DE 102009014655A DE 102009014655 A1 DE102009014655 A1 DE 102009014655A1
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- Germany
- Prior art keywords
- midi
- values
- data values
- frequency
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/17—Function evaluation by approximation methods, e.g. inter- or extrapolation, smoothing, least mean square method
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/0033—Recording/reproducing or transmission of music for electrophonic musical instruments
- G10H1/0041—Recording/reproducing or transmission of music for electrophonic musical instruments in coded form
- G10H1/0058—Transmission between separate instruments or between individual components of a musical system
- G10H1/0066—Transmission between separate instruments or between individual components of a musical system using a MIDI interface
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H2250/00—Aspects of algorithms or signal processing methods without intrinsic musical character, yet specifically adapted for or used in electrophonic musical processing
- G10H2250/541—Details of musical waveform synthesis, i.e. audio waveshape processing from individual wavetable samples, independently of their origin or of the sound they represent
- G10H2250/621—Waveform interpolation
Abstract
Description
Die
vorliegende Erfindung
Stand der Technik:State of the art:
MIDI Daten dienen der Steuerung von Parametern, die z. B. den Klang eines synthetisch erzeugten Tones in einer bestimmten Weise beeinflussen. Zum Beispiel kann ein vom Gerät empfangenes MIDI Datum direkten Einfluss auf die Dauer der Ausklingphase einer synthetisch erzeugten angeschlagenen Klaviersaite haben. Die MIDI Daten selbst dienen hierbei nur zur Steuerung von Prozessabläufen, die wiederum von eigenständigen Klangmodulen abgearbeitet werden.MIDI Data are used to control parameters that z. B. the sound of a affect synthesized sounds in a certain way. For example, one from the device received MIDI date directly affects the duration of the decay phase of a synthetically produced ailing piano string. The MIDI data itself serve only to control processes, the again of independent Sound modules are processed.
Weil MIDI Daten binär als Bits in Datenpaketen gesendet werden, können sie entweder von einem Mikroprozessor so weiterverarbeitet werden, dass sie direkt in die Algorithmen einer digitalen Tonerzeugung eingreifen oder mit Digital-Analog-Konvertern in Steuerspannungswerte zur Steuerung analog arbeitender Klangerzeugungs- bzw. Signalverarbeitungssysteme umgewandelt werden. In beiden Fällen werden diese Daten als direkt wirkende Steuerdaten zur Beeinflussung von Klangparametern benutzt.Because MIDI data binary When bits are sent in data packets, they can either be from one Microprocessor be processed so that they directly into the Intervene algorithms of digital tone generation or with digital-to-analog converters into control voltage values for controlling analog sound generator or signal processing systems are converted. In both cases will be this data as a direct-acting control data for influencing Sound parameters used.
Aufgrund der niedrigen Bitrate von 32500 Hz bei der Datenübertragung ist der Anwendungsbereich stark beschränkt und daher nur für statische oder sehr langsam verlaufende Modulationen geeignet. Ein vollständiges MIDI Datum setzt sich aus einem Statusbyte und zwei Datenbytes, jeweils eingeschlossen von einem Start- und einem Stoppbit, zusammen. Damit müssen, bis auf einige Sonderfälle, bis zu 30 Bits mit der oben genannten Übertragungsrate gesendet werden, bevor ein Datum erkannt und weiterverarbeitet werden kann. Daraus ergibt sich, dass nur mindestens alle 923 μs ein MIDI Datum empfangen werden kann. In der Praxis werden in der Regel noch mehrere Daten zur „gleichzeitigen” Ansteuerung verschiedener Parameter auf einer MIDI Schnittstelle gesendet, so dass die Daten rate für jeweils einen bestimmten Parameter noch wesentlich geringer wird.by virtue of the low bit rate of 32500 Hz in data transmission is the area of application strong limited and therefore only for static or very slow modulations suitable. One complete MIDI date consists of a status byte and two bytes of data, each including a start and a stop bit together. With that, except for a few special cases, up to 30 bits are sent at the above transmission rate, before a date can be recognized and processed. from that results in that only at least every 923 μs will receive a MIDI date can. In practice, more data is usually used for "simultaneous" control various parameters sent on a MIDI interface, so that the data rate for each one parameter is still much lower.
Aus diesen Gründen eignet sich das MIDI Protokoll nicht für die Erzeugung von schnellen Modulationen in hoher Auflösung von Klangparametern, da beispielsweise für ein Durchlaufen von 128 Binärzuständen zur möglichst kontinuierlichen Aufsteuerung eines Amplitudenmodulators mindestens ca. 118 ms nötig wären, wenn keine weiteren Daten zusätzlich auf der MIDI Leitung gesendet würden, was sich überdies nicht garantieren lässt.Out these reasons The MIDI protocol is not suitable for fast generation Modulations in high resolution of sound parameters, since, for example, to go through 128 binary states to preferably continuous control of an amplitude modulator at least approx. 118 ms necessary would be, if no further data in addition would be sent on the MIDI line, what's more can not guarantee.
Weiter ist die Auflösung eines MIDI Datums, abgesehen von ein paar Sonderfällen, die auch nicht immer von allen MIDI Geräten unterstützt werden, in der Regel auf 7 Bit beschränkt, woraus eine starke Stufigkeit der zu steuernden Parameter resultiert. Insbesondere bei Tonhöhen oder tonhöhenverwandten Parametern wie Knick- oder Resonanzfrequenzen bei Audiofiltern ist diese Auflösung unzureichend und wird als störend empfunden, wenn ein quasikontinuierlicher Verlauf infolge eines andauernden MIDI Datenstromes erreicht werden soll.Further is the resolution of a MIDI date, apart from a few special cases, the Also not always supported by all MIDI devices, usually on 7 bit limited, This results in a high degree of complexity of the parameters to be controlled. Especially at pitches or pitch-related Parameters such as kink or resonance frequencies in audio filters is this resolution insufficient and is perceived as disturbing, if a quasi-continuous course as a result of an ongoing MIDI data stream is to be achieved.
Die
vorliegende Erfindung
Nun
wird der Zeitabstand, mit dem die Ereignisinformationen EI(t) am
MIDI-Schnittstelleneingang
Aufgabe
des Interpolationsfilters
Die
Zeitkonstante T des Interpolationsfilters
Der
oben beschriebene Zusammenhang zwischen der Häufigkeitsgröße H(t) und der Zeitkonstanten T
des Interpolationsfilters
Das
Interpolationsfilter
Ein einfacher Ansatz kann beispielsweise nach Gleichung G1.1 gemacht werden.One simple approach can for example be made according to equation G1.1 become.
Hierbei
wird zwischen zeitlich aufeinander folgenden Datenwerten D(tv) linear mit der Zeit t interpoliert und
zwar umso schneller, je Größer die
Häufigkeit
H(tv) zum Zeitpunkt tv ist.
Figur
Die
Umsetzung der Erfindung
- 11
- MIDI InterpolatorMIDI interpolator
- 22
- MIDI-SchnittstelleneingangMIDI interface input
- 33
- MDI-ExtraktorMDI extractor
- 44
- Häufigkeitsauswertungfrequency analysis
- 55
- Interpolationsfilterinterpolation
- 66
- Datenausgang des Interpolationsfiltersdata output of the interpolation filter
- SMDSMD
- Serieller MIDI-Datenstromserial MIDI data stream
- EI(t)EI (t)
- Ereignisinformationevent information
- H(t)H (t)
- Häufigkeitsgrößefrequency size
- D(t)D (t)
- MIDI-DatenwerteMIDI data values
- DI(t)D I (t)
- interpolierte MIDI Datenwerteinterpolated MIDI data values
- D(t)D (t)
- MIDI-DatenwerteMIDI data values
- DI(t)D I (t)
- interpolierte MIDI Datenwerteinterpolated MIDI data values
- tt
- Zeit entlang der ZeitachseTime along the time axis
- Δ1 Δ 1
- Zeitintervall 1time interval 1
- Δ2 Δ 2
- Zeitintervall 2time interval 2
- Asymptoteasymptote
- Angestrebter Endwert von DI(t)Desired end value of D I (t)
Claims (15)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910014655 DE102009014655A1 (en) | 2009-03-25 | 2009-03-25 | Musical instruments digital interface data interpolation method for e.g. piano, involves interpolating intermediate values between discrete data values arriving sequentially at arbitrary time under influence of frequency size, by filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910014655 DE102009014655A1 (en) | 2009-03-25 | 2009-03-25 | Musical instruments digital interface data interpolation method for e.g. piano, involves interpolating intermediate values between discrete data values arriving sequentially at arbitrary time under influence of frequency size, by filter |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102009014655A1 true DE102009014655A1 (en) | 2010-10-07 |
Family
ID=42674802
Family Applications (1)
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---|---|---|---|
DE200910014655 Ceased DE102009014655A1 (en) | 2009-03-25 | 2009-03-25 | Musical instruments digital interface data interpolation method for e.g. piano, involves interpolating intermediate values between discrete data values arriving sequentially at arbitrary time under influence of frequency size, by filter |
Country Status (1)
Country | Link |
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DE (1) | DE102009014655A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB785361A (en) * | ||||
JPS58114104A (en) * | 1981-12-26 | 1983-07-07 | Shimadzu Corp | Analog interpolating circuit |
US5850049A (en) * | 1995-12-21 | 1998-12-15 | Yamaha Corporation | Musical tone-generating method and apparatus using data interpolation |
DE3943795C2 (en) * | 1988-11-19 | 2002-10-17 | Sony Computer Entertainment Inc | interpolation |
US6570081B1 (en) * | 1999-09-21 | 2003-05-27 | Yamaha Corporation | Method and apparatus for editing performance data using icons of musical symbols |
-
2009
- 2009-03-25 DE DE200910014655 patent/DE102009014655A1/en not_active Ceased
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB785361A (en) * | ||||
JPS58114104A (en) * | 1981-12-26 | 1983-07-07 | Shimadzu Corp | Analog interpolating circuit |
DE3943795C2 (en) * | 1988-11-19 | 2002-10-17 | Sony Computer Entertainment Inc | interpolation |
US5850049A (en) * | 1995-12-21 | 1998-12-15 | Yamaha Corporation | Musical tone-generating method and apparatus using data interpolation |
US6570081B1 (en) * | 1999-09-21 | 2003-05-27 | Yamaha Corporation | Method and apparatus for editing performance data using icons of musical symbols |
Non-Patent Citations (2)
Title |
---|
MIDI Manufactures Association: Tutorial: MIDI and Music Synthesis. (recherchiert am 02.12.2009). Im Internet: * |
MIDI Manufactures Association: Tutorial: MIDI and Music Synthesis. (recherchiert am 02.12.2009). Im Internet: <URL://www.midi.org/aboutmidi/tut_midimusicsynth.php> |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
8122 | Nonbinding interest in granting licenses declared | ||
R002 | Refusal decision in examination/registration proceedings | ||
R003 | Refusal decision now final |
Effective date: 20121228 |