EP1239453A1 - Verfahren und Vorrichtung zur Klangsignalerzeugung - Google Patents
Verfahren und Vorrichtung zur Klangsignalerzeugung Download PDFInfo
- Publication number
- EP1239453A1 EP1239453A1 EP01810245A EP01810245A EP1239453A1 EP 1239453 A1 EP1239453 A1 EP 1239453A1 EP 01810245 A EP01810245 A EP 01810245A EP 01810245 A EP01810245 A EP 01810245A EP 1239453 A1 EP1239453 A1 EP 1239453A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- time
- variable
- mapping function
- sound signal
- 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.)
- Granted
Links
- 230000005236 sound signal Effects 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000013507 mapping Methods 0.000 claims description 59
- 230000008859 change Effects 0.000 claims description 5
- 238000003384 imaging method Methods 0.000 abstract description 5
- 230000006870 function Effects 0.000 description 48
- 230000008901 benefit Effects 0.000 description 8
- 238000001228 spectrum Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000007620 mathematical function Methods 0.000 description 2
- 238000001308 synthesis method Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- 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
- G10H1/0008—Associated control or indicating means
Definitions
- the invention relates to a method for generating a sound signal according to the preamble of claim 1.
- the invention further relates a device for generating a sound signal according to the Preamble of claim 12.
- a time-variable sound signal such as a sine, triangle or square wave
- a digital the amplitude of the sound signal representative value is calculated.
- the digital generated in this way
- the sound signal is then converted into an analog sound signal and can, for example with an electroacoustic transducer such as a loudspeaker, in an acoustic, from the human ear as sound or changed as a sound perceptible vibration.
- the object of the present invention is a method propose that allows to produce sophisticated sounds.
- a signal generator 2 supplies a time-variable, digital signal r (t).
- n digital signal generators 2a, 2b,... 2n are arranged, each of which supplies its own partial signal r i (t), namely the partial signals r 1 (t), r 2 (t), ... r n (t ).
- the signal generators 2a, 2b, .. 2n are connected to an imaging device 3 via electrical signal lines 5.
- the imaging device 3 is connected via a signal line 6 and a high-pass filter 4 to an output line 7, to which an analog or digital sound signal o (t) is present.
- a digital-to-analog converter can be arranged after the high-pass filter 4, so that an analog sound signal is present on the output line 7, the high-pass filter being designed as a digital filter.
- the value range of the analog sound signal o (t) can be, for example, between -5 volts and 5 volts.
- the value range of the digital sound signal o (t) can be, for example, between -2 15 and 2 15 -1.
- the digital signal r (t) comprising the partial signals r 1 (t), r 2 (t), ... r n (t) can also be referred to as a multidimensional time-variable signal.
- a time-variable, periodic, digital signal r (t) is generated in the signal generator 2, its parameters, for example the waveform, the frequency, the center and / or the amplitude, being specifiable. Middle is understood to mean the offset or the analog DC voltage component.
- an individual partial signal r i (t) can be generated in each signal generator 2a, 2b,... 2n.
- a time-variable signal r (t) can also be permanently stored in the signal generator 2, for example in a memory referred to as ROM (Read Only Memory).
- the sub-signals r i (t), ie the sub-signals r 1 (t), r 2 (t), ... r n (t), are generated.
- these sub-signals r i (t) are mapped into a sound signal o (t) using a mapping function f.
- This mapping function f maps the digital partial signals r i (t) as a discrete-time sequence of real numbers, which sequence can have a DC voltage component.
- a digital value is generated at regular time intervals.
- the mapping function f thus has the property, the vector r ( t ) to transform the partial signals r 1 (t), r 2 (t), ... r n (t) into the sound signal o (t).
- the n-dimensional vector r ( t ) is thus mapped by the mapping function f into a one-dimensional function o (t), which defines the sound signal or an audio signal.
- An advantage of the synthesis method according to the invention is that previously unknown division of control or Influencing the sound parameters.
- the fundamental frequency of the sound signal o (t) preferably depends solely or essentially on the fundamental frequency of the signal r 1 (t).
- time-variable signal r ( t ) depends on both the fundamental frequency of the sound signal o (t) and further frequency components on the respective fundamental frequency of the individual partial signals r 1 (t), r 2 (t), ... r n (t).
- the spectrum of the sound signal o (t) becomes in addition to the properties of the signal r ( t ) essentially determined by the mapping function f. For example, assigns the signal r ( t ) and / or the mapping function for discontinuities or jump points, a sound signal o (t) with a demanding frequency spectrum can be expected.
- the frequency spectrum of the sound signal o (t) thus also depends on the properties of the mapping function f, in particular on the spatial spectrum of the mapping function f.
- a sub-signal r i (t) is generated.
- the frequency ⁇ can be set on the signal generator 2a and the frequency ⁇ and the factor k on the signal generator 2b.
- both sub-signals have the same frequency ⁇ .
- the calculation of r 1 (t), r 2 (t) and o (t) takes place digitally in time-discrete steps, and also simultaneously or simultaneously or essentially simultaneously.
- the value of r 1 (t1) and r 2 (t1) is initially calculated, and the value for o (t1) is then determined immediately.
- the value at time-discrete time t1 + ⁇ T is then calculated by first calculating the value of r 1 (t1 + ⁇ T) and r 2 (t1 + ⁇ T), and then immediately calculating the value for o (t1 + ⁇ T).
- the values of r 1 (t), r 2 (t) and o (t) are continuously calculated, the signals r 1 (t), r 2 (t) being able to be changed by interventions in the signal generator 2a, 2b, where the resulting effect can be heard immediately via the sound signal o (t).
- the mapping function f can be changed by, for example, changing a factor in a mapping function, or by exchanging a predetermined mapping function for another predetermined mapping function. The effect achieved in this way can also be heard immediately via the sound signal o (t).
- the sound signal o (t) can thus be changed interactively and adjusted according to your preference and personal taste.
- t / 170 or the term t / 200 forms the middle, also referred to as offset or DC voltage component.
- the factor a (t) for example, a response, a conclusion or a velocity can be modulated.
- the time variable signal r ( t ) and the mapping function f can be changed by changing parameters, which causes a change in the optical display.
- This results in the advantage that the generated sound signal o (t) is not only available acoustically audibly, but also shows the interaction of the sub-steps visually, which results in the advantage that the sound signal o (t) is simpler, more user-friendly and more differentiated is adjustable.
- the parameters of the time-variable signal r ( t ) and the mapping function f can be changed interactively via the visual display, for example by displaying the time-variable signal r ( t ) is shifted with respect to the representation of the mapping function f in the xy plane, which results in a change in the parameters and thus a change in the sound signal o (t).
- mapping function f could not only be as in FIG. 5 or 6 shown, a mathematical function can be used, but any three-dimensional surface.
- the in Figures 5 and 6 Mapping function f shown is calculated digitally, with each on the intersection of two straight lines running in the x and y directions the values are calculated exactly. These flat, digital Values of the mapping function f are also referred to below as called three-dimensional surface. The values between the Intersections are preferably interpolated.
- Mapping function f is, for example, also an image, for example a photographic, digitized image, its color values or Grayscale values form the value f of the mapping function f.
- FIG. 2 schematically shows a sound signal generating device 1 for carrying out the method according to the invention.
- the exemplary embodiment shown shows a computer with a microprocessor 11, interfaces 13, user interfaces 14, memory 15, and a digital signal processor (DSP) 16, all of which exchange information via a common data bus 12.
- DSP digital signal processor
- the parameters required for specifying or calculating the partial signals r i (t) and the mapping function 2 are entered via the user interface 14.
- the partial signal r i (t) is then calculated by the digital signal processor 16 using the DSP software that can be run in the memory 17, and is mapped onto the sound signal o (t) via the mapping function f.
- a digital high-pass filter can also be implemented, so that the sound signal o (t) calculated by the digital signal processor 16 is fed to the electrical signal line 7 via the interface 13, for example as an audio signal.
- mapping function f is adapted accordingly to the n-dimensional vector r ( t ) again in a one-dimensional sound signal o (t).
- Fig. 8 shows the time course of an analog sound signal g (t) and the time course of the same, digitized sound signal g [n], which consists of a sequence of digital base values which are around the regular time period ⁇ T are spaced. 8 are the values g [0], g [1] and g [5] specially marked.
- a meandering track 21 is drawn in an xy plane.
- the track 21 has a continuous sequence of mutually equally spaced points, each of these points being assigned a base value g [n].
- base value g [n] For example, the values g [0], g [1] and g [5] are specifically identified in FIG. All base values g [n] of the sound signal g (t) shown in FIG. 8 are assigned along the track 21 in this way.
- These base values g [n] form a mapping function f running three-dimensionally over the xy plane, similarly as shown three-dimensionally in FIGS. 5 or 6.
- mapping the signal r (t) with the mapping function f shown in FIG. 9 the following peculiarity arises: If the signal r (t) is selected such that its values in the xy plane are exactly the same as those in FIG. 9 points shown, the output signal o (t) is the digitized signal g (t) or the digital signal g [n]. It is thus possible to generate the digital sound signal g [n] using the mapping function.
- the output signal o (t) is similar to the sound signal g [n] on.
- the sound distortion of the sound signal g [n] will be different. This method thus makes it possible to reproduce a sound signal g [n] as recorded as the original sound, or to change it in a variety of ways by changing the parameters of the signal r (t).
- the course of the track 21 can be in a multitude of in an x-y plane Possibilities are defined.
- 10 shows an example spiral track 21, along which the digital values of the sound signal g [n] are entered.
- the digital values are along the track 21 preferably arranged at equidistant intervals and thus define a three-dimensional surface consisting of a Variety of base values, or the mapping function f.
- the signal In order to reproduce the original sound signal g [n], the signal must r (t) for the mapping function f shown in FIG follow spiral track 21.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Stereophonic System (AREA)
- Studio Devices (AREA)
- Electrophonic Musical Instruments (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
Description
- Erzeugen oder Wahl eines zeitvariablen Signals r(t),
- Erzeugen oder Wahl einer Abbildungsfunktion f welche derart ausgestaltet ist, dass sie das zeitvariable Signal r(t) als eine Folge reeller Zahlen abbildet,
- und Berechnen des Klangsignals o(t) indem das zeitvariable Signal r(t) durch die Abbildungsfunktion f abgebildet wird. Das erfindungsgemässe Klangsignalerzeugungsverfahren, welches auch als Klangsyntheseverfahren bezeichnet wird, ermöglichst eine Vielzahl unterschiedlicher Klänge zu erzeugen, sowohl interessante, ausgefallene Klänge, als auch natürlich klingende Klänge. Das erfindungsgemässe Klangsignalerzeugungsverfahren erlaubt wesentlich komplexere Klänge zu erzeugen, als dies mit üblichen Synthesizern möglich ist. Zudem bietet das Klangsignalerzeugungsverfahren verschiedene Eingriffsmöglichkeiten um die Klänge, beispielsweise die Klangfarbe, zusätzlich zu beeinflussen. Die zur Klangsignalerzeugung erforderliche Vorrichtung kann sehr einfach und kostengünstig ausgestaltet sein, und umfasst in einer bevorzugten Ausführungsform im wesentlichen einen Rechner mit Speicher, Ein- und Ausgabemittel wie eine Tastatur und/oder eine Computermaus, sowie ein entsprechendes Ansteuerprogramm beziehungsweise eine Software zur Ansteuerung des Rechners.Das erfindungsgemässe Verfahren zur Klangsignalerzeugung umfasst im wesentlichen zwei Teilverfahren. In einem ersten Teilverfahren wird ein zeitvariables, vorzugsweise digitales Signal r(t) erzeugt, welches in einem zweiten Teilverfahren mit Hilfe einer Abbildungsfunktion f in eine zeitvariable Folge reeller Zahlen abgebildet wird, welche ein digitales Klangsignal o(t) bilden, das als elektrisches Signal oder beispielsweise über einen Lautsprecher ausgegeben werden kann.Das erfindungsgemässe Klangsignalerzeugungsverfahren weist die Vorteile auf,
- dass damit Klänge erzeugbar sind, welche mit anderen bekannten Verfahren nicht erzeugbar sind,
- dass eine Veränderung der Klänge in Echtzeit möglich ist,
- dass der Rechenaufwand zur Berechung des Klangsignals o(t) gering ist,
- und dass die Klänge über eine entsprechend ausgestaltete Schnittstelle interaktiv, zum Beispiel durch eine Handbewegung beziehungsweise über eine Computermaus, veränderbar sind.
- Fig. 1
- ein Signalflussdiagramm einer Klangsignalerzeugungsvorrichtung;
- Fig. 2
- schematisch den Aufbau einer Klangsignalerzeugungsvorrichtung;
- Fig. 3
- ein erstes Beispiel eines zweidimensionalen, zeitvariablen Signals r(t);
- Fig. 4
- ein zweites Beispiel eines zweidimensionalen, zeitvariabeln Signals r(t);
- Fig. 5
- ein erstes Beispiel einer Abbildungsfunktion;
- Fig. 6
- ein zweites Beispiel einer Abbildungsfunktion;
- Fig. 7
- Beispiele für Abbildungsfunktionen und zeitvariable Signale;
- Fig. 8
- ein analoges und digitalisiertes Klangsignal;
- Fig. 9
- ein drittes Beispiel einer Abbildungsfunktion;
- Fig. 10
- ein viertes Beispiel einer Abbildungsfunktion.
- die einzelnen Teilsignale ri(t) bezüglich Frequenz und/oder Amplitude und/oder Phase und/oder Offset veränderbar sind
- und/oder die Abbildungsfunktion f veränderbar ist
- und/oder die gegenseitige Lage der Teilsignale ri(t) und der Abbildungsfunktion f veränderbar ist.
Claims (12)
- Verfahren zum Erzeugen eines Klangsignals o(t), umfassend die Schritte:Erzeugen oder Wahl eines zeitvariablen Signals r(t),Erzeugen oder Wahl einer Abbildungsfunktion f welche das zeitvariable Signal r(t) als eine Folge reeller Zahlen abbildet,und Berechnen des Klangsignals o(t) indem das zeitvariable Signal r(t) durch die Abbildungsfunktion f abgebildet wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das zeitvariable Signal r(t) und/oder das Klangsignal o(t) in zeitdiskreten Schritten berechnet wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Klangsignal o(t) mit einem Hochpassfilter gefiltert wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das zeitvariable Signal r(t) als ein Vektor
r (t) bestehend aus mehreren zeitvariablen Teilsignalen ri(t) ausgebildet ist. - Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass für jedes zeitvariable Teilsignal ri(t) die Wellenform und/oder die Frequenz und/oder der Offset und/oder die Amplitude einstellbar ist.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das zeitvariable Signal r(t) und/oder die Abbildungsfunktion f graphisch dargestellt wird und insbesondere interaktiv veränderbar ist.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Abbildungsfunktion f als zweidimensionale Funktion ausgestaltet ist und eine dreidimensionale Fläche im Raum definiert.
- Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Abbildungsfunktion f als digitales Bild ausgestaltet ist, dessen Farbwerte oder Graustufenwerte die dreidimensionale Fläche im Raum definiert.
- Verfahren nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass das zeitvariable Signal r(t) aus zwei zeitvariablen Teilsignalen ri(t) besteht, dass das zeitvariable Signal r(t) in einer Ebene verlaufend dargestellt wird, indem die beiden zeitvariablen Teilsignale ri(t) den Wert je einer Dimension der Ebene festlegen, und dass die zeitvariablen Teilsignale ri(t) und die Abbildungsfunktion f gemeinsam dargestellt und interaktiv gegeneinander verschiebbar sind, um derart das Klangsignal o(t) zu verändern.
- Verfahren nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, dass eine in einer x-y-Ebene verlaufenden Spur (21) erzeugt wird, und dass die Abbildungsfunktion f durch ein digitales Klangsignal g[n] gebildet wird, dessen Werte entlang der Spur (21) eingetragen werden.
- Verfahren nach Anspruch 10, dadurch gekennzeichnet, dass das zeitvariabel Signal r(t) entlang der Spur (21) verlaufend gewählt wird, sodass über die Abbildungsfunktion f das Klangsignal g[n] erzeugt wird.
- Vorrichtung zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche, umfassend einen Rechner (11), Software sowie Ein- und Ausgabemittel (13,14), mit welchen zumindest ein elektroakustischer Wandler zur akustischen Ausgabe des Klangsignals o(t) signalübertragend verbindbar ist.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE50112930T DE50112930D1 (de) | 2001-03-09 | 2001-03-09 | Verfahren und Vorrichtung zur Klangsignalerzeugung |
| AT01810245T ATE371922T1 (de) | 2001-03-09 | 2001-03-09 | Verfahren und vorrichtung zur klangsignalerzeugung |
| EP01810245A EP1239453B1 (de) | 2001-03-09 | 2001-03-09 | Verfahren und Vorrichtung zur Klangsignalerzeugung |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01810245A EP1239453B1 (de) | 2001-03-09 | 2001-03-09 | Verfahren und Vorrichtung zur Klangsignalerzeugung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1239453A1 true EP1239453A1 (de) | 2002-09-11 |
| EP1239453B1 EP1239453B1 (de) | 2007-08-29 |
Family
ID=8183785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01810245A Expired - Lifetime EP1239453B1 (de) | 2001-03-09 | 2001-03-09 | Verfahren und Vorrichtung zur Klangsignalerzeugung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1239453B1 (de) |
| AT (1) | ATE371922T1 (de) |
| DE (1) | DE50112930D1 (de) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988004861A1 (en) * | 1986-12-23 | 1988-06-30 | Joseph Charles Lyons | Audible or visual digital waveform generating system |
| US5684259A (en) * | 1994-06-17 | 1997-11-04 | Hitachi, Ltd. | Method of computer melody synthesis responsive to motion of displayed figures |
| US5812688A (en) * | 1992-04-27 | 1998-09-22 | Gibson; David A. | Method and apparatus for using visual images to mix sound |
| WO1999013455A1 (en) * | 1997-09-05 | 1999-03-18 | The Board Of Trustees Of The University Of Illinois | System and method for interfacing sound synthesis to movement |
-
2001
- 2001-03-09 AT AT01810245T patent/ATE371922T1/de not_active IP Right Cessation
- 2001-03-09 DE DE50112930T patent/DE50112930D1/de not_active Expired - Lifetime
- 2001-03-09 EP EP01810245A patent/EP1239453B1/de not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988004861A1 (en) * | 1986-12-23 | 1988-06-30 | Joseph Charles Lyons | Audible or visual digital waveform generating system |
| US5812688A (en) * | 1992-04-27 | 1998-09-22 | Gibson; David A. | Method and apparatus for using visual images to mix sound |
| US5684259A (en) * | 1994-06-17 | 1997-11-04 | Hitachi, Ltd. | Method of computer melody synthesis responsive to motion of displayed figures |
| WO1999013455A1 (en) * | 1997-09-05 | 1999-03-18 | The Board Of Trustees Of The University Of Illinois | System and method for interfacing sound synthesis to movement |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1239453B1 (de) | 2007-08-29 |
| ATE371922T1 (de) | 2007-09-15 |
| DE50112930D1 (de) | 2007-10-11 |
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