dimarts, 18 de setembre del 2012
Pràctica 3
Hola a tots i totes!
La següent feina a fer tindrà a veure amb l'escalat i l'escapçament. Parlem d'ESCALAT quan ens referim a convertir, en el nostre cas, una imatge en la mateixa imatge però més petita o gran. Per tant, reduïr o augmentar la MIDA de la imatge seria escalar-la.
Com ja sabreu, podem distingir entre 3 tipus d'escala: L'escala NATURAL (1:1, la imatge queda igual que la original), l'escala d'AMPLIACIÓ (2:1, 3:1, 100:1..., la imatge final és molt més gran que la original, útil sobretot si volem veure clarament figures petites o detalls) i l'escala de REDUCCIÓ (1:2, 1:3, 1:10... on la imatge original és molt gran i hem de reduïr-la per a poder representar-la o veure-la en la seva totalitat.
M'agradaria que busquèssiu una imatge mitjana en bmp (igual que en la pràctica anterior) i l'escalèssiu ampliada i reduida. Com que podreu conèixer les mides, m'agradaría que em calculèssiu l'escala que heu aplicat (escala = mida final / mida inicial --> 1:"escala" si es reducció o "escala":1 si és ampliació). Un cop fet, m'envieu les 3 imatges i un word amb el càlcul, el resultat dels escalats i les preguntes de sota comprimit en un zip al meu correu.
Per tant, què heu de fer?
1.- Buscar una imatge mitjana en bmp
2.- Ampliar-la i reduïr-la amb el GIMP (funció d'escalat)
3.- Contestar en un word: Què passa amb la qualitat quan l'ampliem? Què passa quan la reduïm?
4.- Continuar en el word: A quin tipus de publicació (fotolog, wiki, web, treball en word, powerpoint) li deu anar millor una imatge reduïda? I una ampliada?
5.-Calcular i afegir al word les escales
6.- Fer un zip amb les preguntes, el càlcul i les imatges i enviar-m'ho al correu
Recordeu que si teniu qualsevol dubte només cal que m'ho digueu
Ànim!
dijous, 13 de setembre del 2012
Benvinguts!! Pràctiques 1 i 2
Bona tarda a tothom!
Benvinguts al curs d'Informàtica 2012-2013 d'aquest bloc online. Ja esteu una mica habituats a treballar així (les últimes pràctiques de l'any passat les fèiem així), però us recordo el funcionament.
Només cal que entre al bloc, llegiu la pràctica corresponent i la realitzeu, enviant-me-la després per correu.
Ànim i endavant!!
Començarem a entrar en matèria veient la aplicació pràctica de les coses.
En aquestes dues primeres pràctiques heu, en primer lloc, de realizar un petit powerpoint amb informació sobre 5 tipus diferents de format d'imatge.
Un cop ho tingueu fet, m'ho ensenyeu i passeu a la segona part. Haureu de cercar una imatge per internet (per exemple, a google/images) que tingui una mida gran i estigui en format .bmp. Per MIDA entenem la llargada per l'amplada (per exemple, 1024x768). Aquestes mesures venen donades en PÍXELS, és a dir, la unitat de referència de la "mida" d'imatges o continguts visuals similars. Per tant, estem parlant d'una imatge que tingui més de 1000 píxels de llarg per més de 700 píxels d'ample.
Un cop tingueu aquesta imatge, heu de canviar el format a cadascun dels cinc que hem vist. Al final, tindreu 5 imatges en formats diferents. Un cop tingueu aquestes imatges, ompliu una taula on, per cada format d'imatge, compareu el pes (recordeu posar les unitats: Bytes, Kilobytes, Megabytes...) y la resolució o qualitat de cadascuna. Envieu-me les imatges i la taula en un .zip a la meva direció de correu.
Per tant, què heu de fer en aquesta segona part:
1.- Buscar una imatge en bmp de mida gran i guardar-la a l'equip (escriptori)
2.- Canviar-li el format i obtenir 5 imatges amb els 5 formats diferents
3.- Omplir una taula que creareu amb el word on per cada format s'indiqui el pes i la qualitat de la imatge
4.- Comprimir-ho i enviar-m'ho adjunt en un e-mail amb assumpte "el vostre nom".
Bona sort!!
P.D.: Podeu unir-vos al bloc i subscriure-us per rebre les actualitzacions abans que ningú i fer comentaris a alguna entrada, també.
dimarts, 17 d’abril del 2012
Pràctica 5
Hello everyone!
It has been so long since we had our last class! So today I want you to finish and send me all the practices you have already started, and a little more.
Try to generate these waves:
-sinusoidal, 30 Hz
-squared, 30 Hz
-triangle and/or sawtooth, 30 Hz
And compare them. How do they sound? Which sounds better? Why do you think so?
Try now to generate a 2000 Hz wave with the same three waveforms. Answer again the same questions.
Finally, generate a wave at the limit of your hearing amplitude. Answer the questions again.
Send me the answers in a doc document or directly in the e-mail.
Relax is over: It's showtime!
Xavi
It has been so long since we had our last class! So today I want you to finish and send me all the practices you have already started, and a little more.
Try to generate these waves:
-sinusoidal, 30 Hz
-squared, 30 Hz
-triangle and/or sawtooth, 30 Hz
And compare them. How do they sound? Which sounds better? Why do you think so?
Try now to generate a 2000 Hz wave with the same three waveforms. Answer again the same questions.
Finally, generate a wave at the limit of your hearing amplitude. Answer the questions again.
Send me the answers in a doc document or directly in the e-mail.
Relax is over: It's showtime!
Xavi
divendres, 30 de març del 2012
Pràctica 4
Good morning!
In this new post we are going to learn about different waveforms and how they are listened by us.
Depending on the frequency of the signal, the tone we listen is higher or lower. Human ears aresupposed to be able to listen frequency between 20 Hz and 20 KHz. Human voice is supposed to have a frequency between 33 Hz and 3 KHz.
In this practice I want you to generate tones and research about their features:
Task list: Answer in the mail or in a word document. You will only have to send me this document
1.- Generate a sinusoidal 30 Hz - 5 seconds-long wave. Can you hear it? How does it sound?
2.- Generate a sinusoidal 2KHz - 5 seconds-long wave. Can you hear it? Compared to the last, how does it sound?
3.- Generate a sinusoidal 1Hz - 5 seconds-long wave. Can you hear it?
4.- Generate a sinusoidal 400KHz - 5 seconds-long wave. Can you hear it? Why?
5.- Try to generate different frequency waves. Which is your frequency-listening limit?
6.- Generate a sinusoidal 1KHz tone. Generate a squared 1KHz tone. Generate noise. Which are their differences?
7.- Generate a DTMF (Dual Tone Multifrequency). What does this remind you?
8.- Look for information in Internet about the DTMF. Llok for the frequencies used in each number in a mobile phone. Can you generate DTMF tones in Audacity related to your mobile phone?
Send the document to my mail or answer directly in it.
Good luck!
Xavi
P.D.: Remember that being connected to facebook stands for a 0 note of procedimentals in this session.
In this new post we are going to learn about different waveforms and how they are listened by us.
Depending on the frequency of the signal, the tone we listen is higher or lower. Human ears aresupposed to be able to listen frequency between 20 Hz and 20 KHz. Human voice is supposed to have a frequency between 33 Hz and 3 KHz.
In this practice I want you to generate tones and research about their features:
Task list: Answer in the mail or in a word document. You will only have to send me this document
1.- Generate a sinusoidal 30 Hz - 5 seconds-long wave. Can you hear it? How does it sound?
2.- Generate a sinusoidal 2KHz - 5 seconds-long wave. Can you hear it? Compared to the last, how does it sound?
3.- Generate a sinusoidal 1Hz - 5 seconds-long wave. Can you hear it?
4.- Generate a sinusoidal 400KHz - 5 seconds-long wave. Can you hear it? Why?
5.- Try to generate different frequency waves. Which is your frequency-listening limit?
6.- Generate a sinusoidal 1KHz tone. Generate a squared 1KHz tone. Generate noise. Which are their differences?
7.- Generate a DTMF (Dual Tone Multifrequency). What does this remind you?
8.- Look for information in Internet about the DTMF. Llok for the frequencies used in each number in a mobile phone. Can you generate DTMF tones in Audacity related to your mobile phone?
Send the document to my mail or answer directly in it.
Good luck!
Xavi
P.D.: Remember that being connected to facebook stands for a 0 note of procedimentals in this session.
dilluns, 26 de març del 2012
Pràctica 3
RGood morning!
I am getting used to post in English and every day I think it's more useful.
In this new practice we are going to work with the tone generation and the frequency of tones. As you should know from last year, frequency stands for the number of cycles that a wave performs in a second. The inverse of frequency, period, stands for the time that a cycle needs to come back to its beginning. Finally, wavelenght stands for the distance between to wave peaks, understanding peaks as the highest point of each wave.
So, in music, for example, we know frequency values (in hertz) of each note:
Do: 261,63 Hz
Re: 293,66 Hz
Mi: 329,63 Hz
Fa: 349,23 Hz
Sol: 392 Hz
La: 440 Hz
Si: 493,88 Hz
Do (octave): 523,25 Hz
In audacity, we can add a lot of tracks and combine them in timeline, as we have seen in last practice. The objective of this second is to build, in tones, the melody of Frère Jacques (the most known French song). You will have to set up the lenght (in seconds) of each tone. For example, for the white notes use 1 second lenght, and for the black ones, use 500 ms (0.5 s)
Let's work!
Xavi
I am getting used to post in English and every day I think it's more useful.
In this new practice we are going to work with the tone generation and the frequency of tones. As you should know from last year, frequency stands for the number of cycles that a wave performs in a second. The inverse of frequency, period, stands for the time that a cycle needs to come back to its beginning. Finally, wavelenght stands for the distance between to wave peaks, understanding peaks as the highest point of each wave.
So, in music, for example, we know frequency values (in hertz) of each note:
Do: 261,63 Hz
Re: 293,66 Hz
Mi: 329,63 Hz
Fa: 349,23 Hz
Sol: 392 Hz
La: 440 Hz
Si: 493,88 Hz
Do (octave): 523,25 Hz
In audacity, we can add a lot of tracks and combine them in timeline, as we have seen in last practice. The objective of this second is to build, in tones, the melody of Frère Jacques (the most known French song). You will have to set up the lenght (in seconds) of each tone. For example, for the white notes use 1 second lenght, and for the black ones, use 500 ms (0.5 s)
Let's work!
Xavi
dimecres, 21 de març del 2012
Pràctica 2
Good afternoon!
In this new post I will be asking you to edit a song. It is going to be easy, as it will be the -I suppose- first contact with the software we are using. The first thing you have to do is to test your audio card and your headphones. If everything goes OK, you can open Audacity, open atube catcher (other software, probably known by you, that we will use to download songs), download a song (remember, in MP3 format) and edit it.
The objective of this practice is to see if you are able to edit a song and what you are capable of. The final result has to be sent to me by e-mail.
So, what should we do? Task list:
-Test audio.
-Download a song.
-Try some effects and editting features (cut, paste, double tracks, compression, amplification, etc)
-Save the final song in MP3.
-Send it by e-mail to me.
Good luck!
Xavi
In this new post I will be asking you to edit a song. It is going to be easy, as it will be the -I suppose- first contact with the software we are using. The first thing you have to do is to test your audio card and your headphones. If everything goes OK, you can open Audacity, open atube catcher (other software, probably known by you, that we will use to download songs), download a song (remember, in MP3 format) and edit it.
The objective of this practice is to see if you are able to edit a song and what you are capable of. The final result has to be sent to me by e-mail.
So, what should we do? Task list:
-Test audio.
-Download a song.
-Try some effects and editting features (cut, paste, double tracks, compression, amplification, etc)
-Save the final song in MP3.
-Send it by e-mail to me.
Good luck!
Xavi
dimarts, 13 de març del 2012
Nou bloc d'àudio! (3rd term begins!)
Hi everybody!
We are at the beginning of a new term, so we start back again. In this unit, we are going to work in audio. I have asked you to bring headphones so that you can listen to the audio tracks you edit and create. We are going to use Audacity, too. Audacity is a free open license software which allows us to edit (filter, cut, amplify, etc) and mix audio tracks. As it is free, you can download it at home, too. If you have not used it yet, I can tell you that it is very intuitive and easy to use. It is alike to windows movie maker, though it is only focused on audio.
But, what have you got to do? First, you will look for information to create a little PowerPoint about audio formats. Then you will add some information about audio software. Finally you will talk about STREAMING (which allows us to watch or listen to videos and audio online).
Task list:
-Create and edit a PowerPoint including the most known audio formats (MP3, WMA, RM, AAC, and others). Explain the differences between MP3 and MP4
-Add some slides with images and a little more information about software associated to these formats (WMPlayer, Winamp, RMPlayer and others).
-Finally, add a pair of slides about Streaming (what it is, what it is for, how it works…)
We are at the beginning of a new term, so we start back again. In this unit, we are going to work in audio. I have asked you to bring headphones so that you can listen to the audio tracks you edit and create. We are going to use Audacity, too. Audacity is a free open license software which allows us to edit (filter, cut, amplify, etc) and mix audio tracks. As it is free, you can download it at home, too. If you have not used it yet, I can tell you that it is very intuitive and easy to use. It is alike to windows movie maker, though it is only focused on audio.
But, what have you got to do? First, you will look for information to create a little PowerPoint about audio formats. Then you will add some information about audio software. Finally you will talk about STREAMING (which allows us to watch or listen to videos and audio online).
Task list:
-Create and edit a PowerPoint including the most known audio formats (MP3, WMA, RM, AAC, and others). Explain the differences between MP3 and MP4
-Add some slides with images and a little more information about software associated to these formats (WMPlayer, Winamp, RMPlayer and others).
-Finally, add a pair of slides about Streaming (what it is, what it is for, how it works…)
When done, you will have to show and explain the PowerPoint to the class. And, I almost forget, you will see more English this term. I will ask you to make the effort of doing something in English. Maybe this PowerPoint (although you finally explain it in Catalan) will be a good chance to begin using it.
Thank you, and have a good term!
Xavi
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