DE2828584A1 - Dynamic range analysis of audio signals - measuring duration of individual levels and feeding output signals to time adding unit - Google Patents

Dynamic range analysis of audio signals - measuring duration of individual levels and feeding output signals to time adding unit

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Publication number
DE2828584A1
DE2828584A1 DE19782828584 DE2828584A DE2828584A1 DE 2828584 A1 DE2828584 A1 DE 2828584A1 DE 19782828584 DE19782828584 DE 19782828584 DE 2828584 A DE2828584 A DE 2828584A DE 2828584 A1 DE2828584 A1 DE 2828584A1
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DE
Germany
Prior art keywords
level
time
audio signal
individual
output signals
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
Application number
DE19782828584
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German (de)
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DE2828584B2 (en
DE2828584C3 (en
Inventor
Peter Ing Grad Burkowitz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Polygram GmbH
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Polygram GmbH
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Publication date
Application filed by Polygram GmbH filed Critical Polygram GmbH
Priority to DE19782828584 priority Critical patent/DE2828584C3/en
Publication of DE2828584A1 publication Critical patent/DE2828584A1/en
Publication of DE2828584B2 publication Critical patent/DE2828584B2/en
Application granted granted Critical
Publication of DE2828584C3 publication Critical patent/DE2828584C3/en
Expired legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
    • G01H3/10—Amplitude; Power
    • G01H3/12—Amplitude; Power by electric means

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)

Abstract

Signal individual level steps are quantitatively evaluated w.r.t. the time during which they appear in the signal. The audio signal is applied to level measuring devices responding to different levels, and their output signals are applied to a time adding unit whose time integral is a measure for the total duration of individual levels in the whole audio signal. A refinement allows consideration to be given to subjective evaluations of tone quality. The counting process only begins when the level concerned has been maintained for a certain time.

Description

Verfahren zur DvnamikanalVse von AudiosignalenProcess for the digital channel of audio signals

Die Erfindung bezieht sich auf ein Verfahren zur Dynamikanalyse von Audiosignalen in bezug auf eine quantitative Bewertung einzelner Pegelstufen in Abhängigkeit von der jeweiligen Zeitdauer, in der diese Pegelwerte im Audiosignal auftreten.The invention relates to a method for dynamic analysis of Audio signals with regard to a quantitative evaluation of individual level levels in Dependent on the respective length of time in which these level values are in the audio signal appear.

Bei der Aufzeichnung von Tonsignalen spielt die Dynamik des jeweiligen Tonprogramms eine sehr wesentliche Rolle.When recording audio signals, the dynamics of each play a role Program plays a very important role.

Dabei ist es, insbesondere im Hinblick auf Störgeräusche und die Hörbarkeit leiser Programmstellen, sehr wichtig, festzustellen, wie lange bestimmte Programmstellen mit welchem Pegel unter einem gewählten Mindestwert auftreten.It is there, especially with regard to background noise and audibility quieter program parts, very important to determine how long certain program parts with which level occur below a selected minimum value.

Diese Überwachung erfolgt bisher rein qualitativ vom aufnehmenden Tonmeister mit Hilfe verschiedener Pegelanzeigegeräte. Sie ist daher im wesentlichen subjektiv und gestattet keinerlei qualifizierbare Aussagen oder Gegenmaßnahmen.This monitoring has so far been carried out purely qualitatively by the recipient Sound engineer with the help of various level indicators. It is therefore essential subjective and does not allow any qualifiable statements or countermeasures.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren anzugeben, mit dessen Hilfe eine quantitative Bewertung der Dynamik von Audiosignalen im Verlaufe eines Programms, insbesondere im Hinblick auf die Dauer der innerhalb oder außerhalb eines bestimmten Pegelbereichs auftretenden Signale, ermöglicht wird.The present invention is therefore based on the object of a method specify, with the help of which a quantitative assessment of the dynamics of audio signals in the course of a program, especially with regard to the duration of the program or signals occurring outside a certain level range.

Ausgehend von einem Verfahren der eingangs näher bezeichneten Art, wird diese Aufgabe erfindungsgemäß in der Weise gelöst, daß das Audiosignal mehreren auf unterschiedliche Pegelwerte ansprechenden Pegelmeßgeräten zugeführt wird und daß die Ausgangssignale der einzelnen Pegelmeßgeräte je einem Zeitaddierglied zugeführt werden, dessen jeweiliges Zeitintegral ein Maß dafür ist, mit welcher Dauer einzelne Pegelbereiche im gesamten Audiosignal enthalten sind. Mit Hilfe von in bezug auf die Tonfrequenzspannung linear oder logarithmisch digitalisierten Pegelmeßgeräten und diesen zugeordneten Zeitaddiereinrichtungen ist es in vorteilhafter Weise möglich, innerhalb eines interessierenden Dynamikbereiches, beispielsweise zwischen -60 dB und -30 dE, stufenweise festzustellen, wie lange insgesamt jede der Teilstufen im gesamten Bereich auftritt.Based on a method of the type specified in the introduction, this object is achieved according to the invention in such a way that the audio signal several is supplied to level measuring devices responding to different level values and that the output signals of the individual level measuring devices are each fed to a time adder whose respective time integral is a measure of the duration with which individual Level ranges are included in the entire audio signal. With the help of in relation to the audio frequency voltage linearly or logarithmically digitized level meters and these associated time adding devices, it is advantageously possible to within a dynamic range of interest, for example between -60 dB and -30 dE to gradually determine how long each of the sub-levels in the occurs throughout the area.

Da bei einer Anzeige von beispielsweise - 35 dB die darunter liegenden Stufen nicht mehr interessieren, werden in einer vorteilhaften Ausgestaltung der Erfindung mittels bekannter Sperrschaltungen nur die Anzeigedauer der jeweils höchsten Stufe dem zugeordneten Zählwerk zugeführt und die erreichten Werte in den darunter liegenden Stufen solange festgehalten.Since, for example, with a display of -35 dB, the values below Steps are no longer of interest, in an advantageous embodiment of the Invention by means of known blocking circuits only the display duration of the highest Level is fed to the assigned counter and the values achieved in the ones below while lying on the stairs.

Zwecks universeller Anwendbarkeit der Erfindung ist die Lösung jedoch nicht auf untere Pegel stufen beschränkt, sondern kann über den gesamten auszuwertenden Dynamik- bereich ausgedehnt werden. Anzahl und Lage der Pegelstufen sind frei wählbar und richten sich nur nach dem Ermittlungszweck oder nach dem verfügbaren Digitalanzeigegerät oder Analog-Digital-Wandler.However, for the purpose of universal applicability of the invention, the solution is not limited to lower levels, but can be evaluated over the whole Dynamics- area can be expanded. Number and position of the level levels are freely selectable and are based only on the purpose of the investigation or on what is available Digital display device or analog-to-digital converter.

In einer weiteren Ausgestaltung der Erfindung wird auf die für den Höreindruck subjektiv maßgebenden Klangerscheinungen Rücksicht genommen und der Zählvorgang erst begonnen, wenn der betreffende Pegel eine bestimmte Zeit angedauert hat. Hiermit kann z.B. eine dem Programminhalt nicht gerecht werdende Bewertung sehr kurzer Niedrigpegel vermieden werden.In a further embodiment of the invention, the for the Listening impression subjectively decisive sound phenomena taken into account and the Counting only started when the level in question has lasted a certain time Has. This can be used, for example, to give an assessment that does not do justice to the content of the program very short low levels can be avoided.

In einer weiteren Ausgestaltung der Erfindung wird ferner die Tonlage in den verschiedenen Pegelstufen bewertet, z.B. nach Fletcher-Munson, und damit der unterschiedlichen Hörbarkeit der verschiedenen Tonlagen bei ansonsten gleichem Pegel Rechnung getragen.In a further embodiment of the invention, the pitch is also used evaluated in the various level levels, e.g. according to Fletcher-Munson, and thus the different audibility of the different pitches with otherwise the same Level taken into account.

4 Patentanspruche4 claims

Claims (4)

Patentansprüche ,rh Verfahren zur Dynamikanalyse von Audiosignalen in bezug auf eine quantitative Bewertung einzelner Pegelstufen in Abhängigkeit von der jeweiligen Zeitdauer, in der diese Pegelwerte im Audiosignal auftreten, d a d u r c h g e k e n n z e i c h n e t , daß das Audiosignal mehreren auf unterschiedliche Pegelwerte ansprechenden Pegelmeßgeräten zugeführt wird und daß die Ausgangssignale der einzelnen Pegelmeßgeräte je einem Zeitaddierglied zugeführt werden, dessen jeweiliges Zeitintegral ein Maß dafür ist, mit welcher Dauer einzelne Pegelbereiche im gesamten Audiosignal enthalten sind.Claims, rh method for dynamic analysis of audio signals with regard to a quantitative evaluation of individual level levels as a function of the respective time duration in which these level values occur in the audio signal, d a it is noted that the audio signal has several to different Level values are supplied to responsive level measuring devices and that the output signals of the individual level measuring devices are each fed to a time adder whose respective The time integral is a measure of the duration of the individual level ranges in the whole Audio signal are included. 2. Verfahren nach Anspruch 1, d a d u r c h g e -k e n n z e i c h n e t, daß mittels bekannter Sperrschaltungen nur die Anzeigedauer der jeweils höchsten Pegelstufe dem zugeordneten Zähladdierglied zugeführt und die erreichten Werte in den darunter liegenden Stufen solange festgehalten werden.2. The method according to claim 1, d a d u r c h g e -k e n n z e i c h n e t that by means of known blocking circuits only the display duration of the respective highest Level is fed to the assigned counting adder and the values reached in the steps below are held for as long. 3. Verfahren nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t , daß der Zählvorgang erst begonnen wird, wenn der betreffende Pegel eine bestimmte Zeit angedauert hat. 3. The method according to claim 1 or 2, d a d u r c h g e k e n n z E i c h n e t that the counting process is only started when the relevant level has lasted a certain time. 4. Verfahren nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß die Tonlage in den verschiedenen Pegelstufen, z.B. nach Fletcher-Munson, bewertet wird. 4. The method according to any one of the preceding claims, d a d u r c it is noted that the pitch in the various levels, e.g. according to Fletcher-Munson.
DE19782828584 1978-06-29 1978-06-29 Process for dynamic analysis of audio signals Expired DE2828584C3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19782828584 DE2828584C3 (en) 1978-06-29 1978-06-29 Process for dynamic analysis of audio signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782828584 DE2828584C3 (en) 1978-06-29 1978-06-29 Process for dynamic analysis of audio signals

Publications (3)

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DE2828584A1 true DE2828584A1 (en) 1980-01-03
DE2828584B2 DE2828584B2 (en) 1980-07-31
DE2828584C3 DE2828584C3 (en) 1981-04-02

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2337634B2 (en) * 1973-07-24 1977-05-26 Siemens AG, 1000 Berlin und 8000 München CIRCUIT ARRANGEMENT FOR EVALUATING THE EXTREME VALUE OF ANY VOLTAGE-TIME FUNCTION

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2337634B2 (en) * 1973-07-24 1977-05-26 Siemens AG, 1000 Berlin und 8000 München CIRCUIT ARRANGEMENT FOR EVALUATING THE EXTREME VALUE OF ANY VOLTAGE-TIME FUNCTION

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Publication number Publication date
DE2828584B2 (en) 1980-07-31
DE2828584C3 (en) 1981-04-02

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