Judul: Noise Reduction on Voice Commands Classification Model using Complete EEMD with Adaptive Noise (CEEMDAN)
Abstrak: The application of voice recognition systems is currently widely used in various fields, one of which is voice commands classification. Voice classification is basically done by using feature extraction to recognize the characteristics of each signal. The MFCC method is used in this study. MFCC is a feature extraction method that calculates the cepstral coefficient by imitating the human hearing systems. In this study, the LSTM model with a bidirectional scheme (Bi-LSTM) is used to build a voice command classification model. This method is considered to be able to accommodate the characteristics of voice commands which have a short duration and sensitive to noise. In order for the classification model to maintain high accuracy, CEEMDAN is used as a noise reduction method. CEEMDAN is considered capable of decomposing noisy signals and separating the original signal from its noise component. The results showed that the Bi-LSTM model had an accuracy of 96% and an F1-score of 95%, but experienced a significant decrease on performance when given by 10 Signal to Noise Ratio (SNR) to 0 SNR noise level. In this study, CEEMDAN has successfully improve the performance of the model on noised data. CEEMDAN is able to increase the accuracy and F1-score by an average of 29.57% and 33.43%, which makes the classification model more robust in classifying voice commands at certain noise levels. The results of the comparison with other noise handling methods show that CEEMDAN performs better in noise reduction.
Keyword: Bi-LSTM, CEEMDAN, MFCC, Penanganan Noise, Perintah Suara

Judul: Speaker Identification System Modeling Using MFCC as Feature Extraction and SVM as Pattern Recognition
Abstrak: Everyday people exchange information using voice may also exchange information with the media texts and tools. Voice signal every human has the character and qualities of different or unique. Indonesia has a diverse ethnic, communities and cultures, many problems are for the same word has different pronunciation patterns. Because of this problem could be a problem in the speaker identification system, so it is necessary to develop a system that is relatively more robust to the problem of intra-speaker variability and noise. Speaker identification system is more focused on the analysis of the two subsystems, namely Feature Extractor and Pattern Recogniser. Mel-Frequency Cepstrum Coefficients (MFCC) is one of feature extraction that is often used for processing the human voice for calculating the cepstral coefficients with the consideration of human hearing. Support Vector Machine (SVM) is one of the classification techniques of data with the supervised learning that is able to classify the multi-class so it is suitable for the classification of more than two classes. Data collection was performed using a microphone to record sound. Sound source was obtained from 10 adult speakers with differences in gender, age and ethnicity, which each speakers say 50 times the word "COMPUTER" so that obtained 500 data. Record duration is 2 seconds with a frequency of 16 KHz. Before data is processed, a preprocessing stage consisting of the elimination of silence, normalization and noise addition. Gaussian noise is added from the level of 80 dB to 0 dB. After the MFCC feature extraction is done, the next stage is SVM pattern recognition using QP and SMO algorithms. Kernel function tested for RBF, Linear, and Quadratic for each algorithm. Pattern Recognition using Kernel quadratic function with a ratio of 90 : 10 for the test data that the original sound without noise, SMO algorithm produces accuracy of 97.0% and the accuracy of the system can maintain above 70% up to 40dB noise addition. The number of errors for all 10 speakers using the test data of the original sound without noise is at most the number 9 speakers (Male, 41 years old, Java). The processing time SMO algorithm is better than the QP algorithm. Future studies may be added to increase the accuracy of Noise Cancelling the voice data is contaminated by noise.
Keyword: Speaker Identification, MFCC, SVM

Judul: Tingkat Kelahiran Ikan Plati Sunset Xiphophorus maculatus (Günther, 1866) pada Beberapa Tingkat Suhu Air
Abstrak: Ikan plati merupakan ikan hias air tawar yang bereproduksi dengan cara melahirkan (viviparous) dalam beberapa waktu. Memproduksi ikan plati dalam skala besar ternyata dihadapkan pada kendala yang besar, yaitu belum ada teknologi kelahiran anak serentak dalam satu waktu. Hal ini berdampak pada umur anak ikan tidak seragam dan pola tanam produksi terganggu, sehingga berujung pada ketidakefisienan dalam produksi. Pada penelitian ini dilakukan upaya penyerentakkan proses kelahiran oleh induk plati melalui rangsangan eksternal berupa peningkatan suhu secara mendadak. Penelitian ini menggunakan rancangan faktorial dengan empat perlakuan sebanyak tiga ulangan. Perlakuan kenaikan suhu yang diberikan adalah 30-32°C selama 12 dan 24 jam. Hasil yang diperoleh perlakuan kenaikan suhu ke 30°C selama 12 jam perlakuan memberikan tingkat induk melahirkan tertinggi.
Keyword: Ikan hias, Kelahiran, Poecillidae, Suhu, Xiphophorus maculatus