Tuesday, August 30, 2016

Ten years blogging: Statistics and keep writing!

Actually this year is the ninth year after I started to blog in 2007. But, if 2007 is counted, this year is the tenth. You can see the difference after nine year with my somewhat seven years old blog. For comparison you can read review and statistics of my seven year blogging here (for this blog, in Indonesian language).

Writing, in my current life, is just a hobby to get benefit in my spare time. Although working in manufacturing industry, I keep writing to keep my mind open to the world. I write for fun, at least till now. I write on wide area, from engineering as my basic to social theme. In engineering, I wrote about computer science and open source project. Tweaking my laptop is another activity to get done in holiday. When I found problem with my laptop, I tried to solve it. Breaking it repeatedly till I got the solution. Then, when I got it, I write it in my blog from the scratch. That is interesting. That makes me feel life in this life.

Statistic of pageviews until August 2016

Saturday, August 27, 2016

Membaca file partisi EXT di MacOS

Setelah dua-tiga kali mencoba, akhirnya tahun lalu saya berhasil membaca (dan menulis) partisi EXT (ext4) di Mac OSX 10.8.5 Mountain Lion. Ext adalah partisi default dan standar pada sistem operasi berbasis Linux dan saat ini ext4 adalah default file partisi Ubuntu. Langkah-langkah membaca file partisi ext pada MacOS adalah sbb:
  1. Install OSXFuse
  2. Install Fuse-ext
  3. Enable read-write via script/terminal
OSXFuse dan fuse-ext pada preference MacOS

Wednesday, August 24, 2016

Speech enhancement on smartphone Voice Recording


Speech enhancement is challenging task in audio signal processing to enhance the quality of targeted speech signal while suppress other noises. In the beginning, the speech enhancement algorithm growth rapidly from spectral subtraction, Wiener filtering, spectral amplitude MMSE estimator to Non-negative Matrix Factorization (NMF). Smartphone as revolutionary device now is being used in all aspect of life including journalism; personally and professionally. Although many smartphones have two microphones (main and rear) the only main microphone is widely used for voice recording. This is why the NMF algorithm widely used for this purpose of speech enhancement. This paper evaluate speech enhancement on smartphone voice recording by using some algorithms mentioned previously. We also extend the NMF algorithm to Kulback-Leibler NMF with supervised separation. The last algorithm shows improved result compared to others by spectrogram and PESQ score evaluation.

For full paper please download here (submitted to ICOPIA 2016). For Octave code (obtainated from single source separation: mini tutorial), and latex code please refer to this link.

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