Dokumen cetak merupakan data digital yang tervisualisasi di kertas. Dokumen cetak mudah dibuat sekaligus dipalsukan. Cara mengetahui keasliannya dengan verifikasi ciri. Setiap dokumen cetak terdapat ciri unik berasal dari printer yang digunakan. Mengembangkan metode untuk menentukan keaslian dokumen cetak dari printer jenis dan tipe sama menjadi tantangan untuk diselesaikan pada penelitian ini. Proses verifikasi menggunakan tahapan akuisisi, ekstraksi, pengenalan pola dan hasil verifikasi. Data uji menggunakan 6 printer jenis dan tipe sama, masing-masing menggunakan 3 lembar sampel, untuk karakter dipilih 8. Hasilnya pengujian menunjukkan nilai EER (equal error rate) sebesar 0,18 dari nilai tersebut digunakan menentukan nilai ambang verifikasi yaitu 80% dari nilai kedekatan. Verifikasi dengan kedekatan diatas 80% berarti dokumen cetak dinyatakan asli (accepted) sedangkan kedekatan dibawah 80% berarti dokumen cetak dinyatakan palsu (rejected). Pengujian menggunakan 20 varian dokumen cetak diperoleh nilai kedekatan tertinggi 97,7% dan terendah 84,1%. Berdasarkan pengujian diperoleh suatu kesimpulan bahwa meskipun pemalsuan menggunakan printer dengan jenis dan tipe yang sama, model mampu memilah dan menentukan suatu dokumen cetak asli ataupun palsu.
This paper focuses on improving the accuracy of noise audio recordings. High-quality audio recording, extraction using the mel frequency cepstral coefficients (MFCC) method produces high accuracy. While the low-quality is because of noise, the accuracy is low. Improved accuracy by investigating the effect of bandwidth on the mel scale. The proposed improvement uses the mel scale separation methods into two frequency channels (MFCC dual-channel). For the comparison method using the mel scale bandwidth without separation (MFCC single-channel). Feature analysis using k-mean clustering. The data uses a noise variance of up to -16 dB. Testing on the MFCC single-channel method for -16 dB noise has an accuracy of 47.5%, while the MFCC dual-channel method has an accuracy better of 76.25%. The next test used adaptive noise-canceling (ANC) to reduce noise before extraction. The result is that the MFCC single-channel method has an accuracy of 82.5% and the MFCC dual-channel method has an accuracy better of 83.75%. High-quality audio recording testing for the MFCC single-channel method has an accuracy of 92.5% and the MFCC dual-channel method has an accuracy better of 97.5%. The test results show the effect of mel scale bandwidth to increase accuracy. The MFCC dual-channel method has higher accuracy.
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