The Use of the Attack Transient Envelope in Instrument Recognition
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1 PAGE 489 The Use of the Attack Transient Enveloe in Instrument Recognition Benedict Tan & Dee Sen School of Electrical Engineering & Telecommunications University of New South Wales Sydney Australia Abstract The transient comonents in instrument signals have been known to contain a vast amount of information about the instrument. The undiscovered information found in the attack is known to be essential in roviding the recognition of the instrument. This aer investigates the attack transient and is successful in discovering one of the features that enable the recognition of the instrument. The enveloe of the attack transient has been used in this aer as a feature of the attack transient and exeriments carried out showing the otential of the enveloe.. Introduction There are hundreds of different tyes of musical instruments in the world today and each of those instruments has its own characteristic that distinguishes it from another. The area of instrument recognition has been an area that has interested many researchers and engineers alike and many have been successful in being able to define features and characteristics that differentiate one instrument from another. Although there have been many features that have been found that enable the identification of certain instruments there is still so much undiscovered information waiting to be found. Looking at the instrument signal from a temoral ersective there are four main sections the attack decay sustain and retard. The main areas of focus in instrument recognition have been focused rimarily on the decay and sustain ortions of the music signal these regions of the signal are also known as the steady-state. The heavy focus on the steady-state regions can be seen due to the signal being stable or seudo-stable during those sections of the signal because of this reason the steady-state is referred over other sections of the signal as the data analysis is made easier due to the availability of steady-state analysis techniues. Brown has conducted studies on the steady-state using various features such as the cestral coefficients and various statistical methods to distinguish instruments (Brown 00). The other comonents of the instrument signal can be classified as transient. There are a number of studies that been conducted that show that there is a vast amount of information contained in the transient sections that enable eole to recognize the instrument. The onset of the instrument signals lays a big art in characterizing the instrument and having this knowledge it is ossible to use just the attack transient to be able to identify an instrument. Although the attack transient contains this information investigation into the transient is still a relatively uncovered area. The nature of the transient being non-stationary and the fact that the boundaries of the transient are not defined exactly makes it difficult to analyse. Keeler carried out exeriments (Keeler 97) and was successfully able to differentiate between various wind instruments using temoral features such as the transient duration delay overshoot and the instability of the signal. Using these temoral features Keeler was able to distinguish between the different families of wind instruments. Through Keeler s aer it was shown that even through simle ercetual features the instruments could be categorized and identified. The urose of this aer is to find a distinguishing feature in the attack transient that will enable the recognition of that instrument comared to another. Using the feature systematic tests will be erformed to show that the features found are feasible to be used as an attribute in instrument recognition. In this aer the attack transient has been defined to be the non-eriodic segments of the attack which have been derived from the definition of transient the level of harmonic content was measured and used as a gauge of the transientness of the signal. This gave a systematic way of obtaining the attack transient and also allowing Proceedings of the th Australian International Conference on Seech Science & Technology ed. Paul Warren & Catherine I. Watson. ISBN University of Auckland New Zealand. December Coyright Australian Seech Science & Technology Association Inc.
2 flexibility to be able to exeriment with different levels of harmonic content in the data. Using threshold these thresholds the attack transient could be extracted from the signal and used in the following exeriments. The reliminary investigations involved analysing several attack transients of a few instruments and from the investigations revealed that there were certain ercetual attributes that were reoccurring in the attack transients. Figure reresents one of the attack transients from a violin wie most distinguishing features circled in. Figure also shows an attack transient wie most noticeable characteristics marked. As can be seen by comaring the two figures they are not comletely identical but there is a large similarity between the two samles. The idea of using the attack transient enveloe became a feasible feature for identification but before any tests could be conducted there were a few roblems that had to be dealt with concerning the use of the enveloe as a feature. There was the issue of the attack transient being different lengths although most of the features were contained in the attack transient their duration in time varied differently and so attern matching oint to oint was not feasible. A method was found which would alleviate the roblem and enable attern matching between the transient signals.. Dynamic Time Waring PAGE 490 The analysis techniue chosen to analyse the instrument signals was the dynamic time waring (DTW) method. This method was rimarily develoed and used as a seech rocessing techniue to be able to attern match seech samles; it allows two seech samles that have time discreancies to be able to be matched correctly to one another. Using this techniue it is then ossible to create a temlate of the attack transient and use the temlate to attern match and comare against instrument samles to try and identify Signal Figure Attack transient of note E4 of violin Figure Attack transient of note G4 of violin Euclidean Signal Further investigations into the attack transients showed that the recurring features could be ointed out in the majority of the attack transients which lead to the ossibility of being able to use the enveloe as a form of identification. Dynamic Time War Figure 3 Comarison of Euclidean and DTW attern matching the correct instrument. A comarison is shown in Fig 3 of the Euclidian based attern matching against the DTW method. The Euclidean based attern matching is a oint to oint comarison of two signals. As shown in Fig 3 the DTW is able to align the neighbouring oints Proceedings of the th Australian International Conference on Seech Science & Technology ed. Paul Warren & Catherine I. Watson. ISBN University of Auckland New Zealand. December Coyright Australian Seech Science & Technology Association Inc.
3 in the samle so that the best match between the samle and temlate is obtained. It can be seen that through this techniue the wared signal will be able to obtain a correct match to the temlate. The rocess of how the DTW works and of which the tests were conducted is as follows. Starting with a temlate P and a samle signal Q to match with length m and n resectively. We have the following P Q = = An m x n matrix d is then formed of which the d ( i j ) value being the distance between i and element therefore giving matrix d wie values j formed by En d ( i j) ( ) i j m n = () From the local distance matrix d the global distance matrix D can then be comuted. Each cell in matrix D is calculated by the summation of the local distance at d i j and smallest distance of the neighbouring ( ) cells of ( i j ) D. The neighbouring cells are chosen by a steing attern which will be covered in the following section. The result is matrix D of which its values are the minimised global distances of the seuences. A ath can then be chosen by the steing ath which results in the otimum maing of one signal to the other. The best ath ossible would be the straight diagonal ath from the corners of the matrix which would mean that the two signals are exactly the same therefore the more the ath deviates from the otimum ath of the diagonal the more distortion and waring that is needed to maniulate the samle to reflect the temlate. The euation to calculate the values of matrix D is as follows ( i j) = d( i j)+ min[ ( i j) D( i j ) D( i j ) ] D D () The waring aat mas the samle to the temlate is the aat results in the least distortion. Starting from D ( ) the next element in the waring ath will be the neighbour wie smallest value. The waring ath will have a minimum length of the max m n and a maximum length of ( m + n). The ( ) final value in ( m n) D is the overall measure of the distortion between the signals the smaller the value the closer the match is between the temlate and samle and the less distortion there is in the maing of the signals. The higher the value the more waring is needed to match the signals together. There are certain constraints that need to be taken note of regarding the waring ath such as the following:- Boundary Conditions: The waring ath must start at D ( ) and end at D ( m n). Continuity: the waring ath can only increase by oint at a time; this makes sure that all oints in the signal are used in the maing. Monotonicity: the waring ath cannot go backwards in time; this condition ensures that a oint that has reviously been maed will not be maed again. There are various euations available to relace En each with different advantages and disadvantages. The algorithms chosen in this aer were the original steing attern shown in En and the Itakura algorithm in En 3. ( i j) = d( i j)+ min[ ( i j) D( i j ) D( i j ) ] D D (3) The advantage that En 3 has over En is that every oint on the temlate is maed and alleviates the roblem of monotonicity. It also allows extends the range of neighbouring cells giving the steing attern a larger range to be able to comare the distances. The difference in the steing attern can be seen in the results in the following section. Each steing attern has its advantages and disadvantages and there is no steing attern that is the overall best attern to use. There are a number of arameters concerned when using the DTW method but it is also a owerful yet uite simle techniue to use in conjunction with attern matching and has roven to be useful in the identification of instruments as seen by the exeriments. 3. Results and Discussion The tests were conducted with two instruments the violin and cello which come from the family of string instruments. In total here were four tests that were conducted and a total of 94 and 68 samles for the cello and violin resectively containing the third fourth and fifth s. The first test conducted consisted of the steing attern described by En and the second test used the same steing attern with a different temlate for the cello instrument. The third and fourth tests were PAGE 49 Proceedings of the th Australian International Conference on Seech Science & Technology ed. Paul Warren & Catherine I. Watson. ISBN University of Auckland New Zealand. December Coyright Australian Seech Science & Technology Association Inc.
4 the same as the revious tests but with a different steing attern. The individual tests conducted were further searated into s and reresented in the results in s and as a whole. Along wie results the ercentages have also been calculated showing the ercentage of correct identifications for that instrument. Also included in the results following are the total for each instrument. 3 7/37 9% 5/5 00% 4 3/4 3% 3/5 9% 5 4/5 7% 38/38 00% Total 4/94 6% 66/68 97% Table results of exeriment Table shows the results from the first test as can be seen the recognition rate of the violin is excellent but the results of the cello are not very good. The result from the first exeriment has confirmed that the DTW is a suitable analysis techniue that can be used for identification. Since the total recognition for the violin is 97% it can be suggested that there is a bias towards the violin at this stage. However through changes in the arameters there is still a lot of room for imrovement as will be seen by the following set of results. In the next exeriment the temlate for the cello was changed. Table shows the results after the change as can be seen there has been an imrovement in the identification rate for the cello which increased % from the first test. The imrovement in results from changing the temlate has shown that an imrovement in the recognition rate can be obtained deending on the temlate chosen to reresent the instrument. On the other hand an inadeuate temlate will result in the recognition rate decreasing. The characteristics of a good temlate are those that contain the various characteristics of the attack transients of that instrument. As a result it can be a rigorous testing rocess to find the most suitable temlate to reresent that instrument and there might be more than one suitable candidate that is able to be used as a temlate. 3 0/37 7% 5/5 00% 4 /4 50% 3/5 9% 5 4/5 7% 38/38 00% Total 35/94 37% 66/68 97% Table results of exeriment The next two exeriments were executed with a changed steing attern which was able to imrove the results even further. The steing attern used was that of En 3 commonly described as the itakura algorithm this steing attern has the advantage that the maing of the temlate to the samle kees moving forward and a oint on the temlate can only be maed once. This is advantageous because it is more desirable for the oints on the temlate to be maed once only so that a more accurate match for the instrument is obtained. Table 3 reresents the results of the test erformed wie first temlate from the first test and also with the itakura steing algorithm of En 3. As can be seen from the results the cello recognition rate has again imroved increasing a further % although the recognition rate for the violin has decreased dramatically. This set of results show how the steing attern has great influence on the results and the ability to match the instruments. One roblem wie steing atterns is that each steing attern has its advantages and disadvantages and there is no best steing attern available. One imortant factor to note is that the steing attern chosen cannot be too stringent or too lenient. A stringent steing attern will result wie temlate only matching to the samles that are almost identical to the temlate and a flexible steing attern will allow all samles to be able to match to the temlate. Finding the correct median for the temlate is crucial to obtaining the correct results while a stringent steing attern is favoured over the lenient attern. For the exeriments carried out in this aer the itakura algorithm and the original steing attern have been suitable in roviding the results that rove that the attack enveloe can be used as a feature for instrument recognition. PAGE 49 Proceedings of the th Australian International Conference on Seech Science & Technology ed. Paul Warren & Catherine I. Watson. ISBN University of Auckland New Zealand. December Coyright Australian Seech Science & Technology Association Inc.
5 3 7/37 46% 5/5 00% 4 6/4 6% 6/5 64% 5 /5 80% 0/38 6% Total 55/94 58% 3/68 46% Table 3 results of exeriment 3 3 8/37 76% 4/5 80% 4 33/4 79% 6/5 64% 5 5/5 00% 4/38 63% Total 76/94 80% 44/68 65% Table 4 results of exeriment 4 The final test was carried out wie imroved temlate and the itakura steing attern the outcome can be seen in the table above. The results for this test have been the most imroved for both instruments while increasing % and 9% resectively for the cello and violin. The recognition rates between the two instruments have both risen to more accetable ercentages showing that the enveloe of the attack can be used as an identifying feature for the instrument. Using the right set of arameters and temlates the attack enveloe can be a owerful identification feature for the instrument. Further work in this area will involve adding more instruments in the tests and also exerimenting with more steing atterns to increase the recognition ercentages. There are a lentiful number of avenues that can be taken from this oint; further research into this area will hoefully be able to imrove the results further and rovide a more robust way of instrument identification. 5. References Brown J.C (00). Feature deendence in the automatic identification of musical woodwind instruments J. Acoust. Soc. Am. Vol. 09 No. 3 Keeler J.S (97). The Attack of Some Organ Pies IEEE Tran on Audio and Electroacoustics Vol. 0 no Keogh E.J and Pazzani M.J (00). Derivative Dynamic Time Waring Deartment of Information and Comuter Science University of California Irvine California USA Tan B (006). The investigation of transient comonents in single instrument music signals School of Electrical Engineering and Telecomunications UNSW Thesis Saldanha E.L. and Corso J.F. (964) Timbre cues and the Identification of Instruments Journal of the Acoustical Society of America Wrigley S.N. Seech Recognition by Dynamic Time Waring htt:// PAGE Conclusion The results discussed in this aer in indicate that we have identified at least one feature in the attack transient which can be used to distinguish between musical instruments. We have shown that the feature amongst the ones investigated is the enveloe of the attack transient. Of course more imrovement will be ossible if we looked beyond just the attack transient. Through the use of the dynamic time waring techniue the enveloe of the instrument can be attern matched to identify that instrument. By matching the features found in the attack transient it is ossible to identify that instrument and the results of the exeriment show that at least two instruments are able to be identified using this method. Proceedings of the th Australian International Conference on Seech Science & Technology ed. Paul Warren & Catherine I. Watson. ISBN University of Auckland New Zealand. December Coyright Australian Seech Science & Technology Association Inc.
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