Creating Web Documents alt attribute Good and bad uses of ‘multimedia’ Sound files Homework: Discuss with me AND post announcement of Project II. Forms & JavaScript next

Browser kerfuffle Look at this using IE versus Netscape

Alternative to images Browser will display "bird" if graphics turned off, also when mouse over image. Why? –Way to offer more information –Step to making Web site ADA compliant (screen reader program will 'say' the alt text)

Sound Spoken word Music Special effects Expectations are that Web sites on topics relating to sound must have sound! What about other Web sites?

Sound Sound is recorded by a process called sampling (but sampling also has another meaning): –Measure the electrical signal picked up by microphone at [some] interval Frequency (measured in times/second = Hz for Hertz) and Amount of information (bits) per measurement –More information (more bits) and sampling more often is better but means larger files

Sound Find Sound Recorder on your computers

Sound Recorder Click File/Properties/Convert Now Note pre-set Telephone quality, Radio, or CD settings.

Digital Audio Sound Recorder produces a wav file. Wav files are used on Web sites. –This can be changed to other formats using other software products. –Other products for recording (and mixing) often start by creating wav files. Two other, important formats for the Web are –Mpg = ‘mpeg’, a compressed format –Streaming audio, downloads and plays in packets, so sound starts very quickly.

Playing a wav file Adding a link Hear this Advantages: Client (site visitor) makes decision to do download Works on most platforms But what if you want to have sound automatically (without user action): See text for embed and bgsound –Problems with different browsers

MIDI Musical Instrument Digital Interface is the standard for connecting instruments (for example, keyboards), computers, synthesizers, and software (sequencers) MIDI is not recorded sound. MIDI is set of instructions, such as –Start note (numbered according to keys on piano) at specific velocity on given channel –Stop note –Set up instrument (= timbre) on channel

Other possibilities Integrate sound into a Flash movie –Creating Dynamic Web Documents course Integrate sound into Director/Shockwave ?

Homework Read on sound and other ‘multimedia’ in HTML text Make posting and read postings on multimedia Contribute to other Forums Talk with me AND make announcement on Project II