Question

the music on a music player can be stored digitally in several formats. a popular format for a digital music player is aiffshort for Audio Interchange File Format. Another format is known as​ AAC, short for Advanced Audio Coding. Files on a digital music player can be in either of these formats or both. The 25 songs in this data set use a mixture of these two formats. Complete parts​ (a) through​ (d) below. Create a dummy variable using the arc format as the baseline category to represent the format of the song in the data file and then fit the regression model for how much space is needed to store a song based on the length of a song. write down the regression model including the estimates of the intercepts

Answer 1

Music, voice, and sound effects can all be recorded and stored on a computer as digital audio. To digitally record sound, samples of the sound are collected at periodic intervals andstored as numeric data. High-quality sound is usually sampled at 44.1 kHz, and each stereosample requires 32 bits of storage space. To conserve space, radio-quality recordings of speaking voices are often recorded at lower sampling rates. Digital audio file formats include WAV, AAC,WMA, Ogg, and MP3. Most portable media players work with MP3 format or with the AAC format, used for .mp4 files at the Itunes store. These media files can be acquired as download,livestream, or on-demand stream. MIDI music issynthesized sound that is artificially created. Aseries of MIDI messages specify the pitch, volume, and duration of notes that sound like variousmusical instruments. MIDI files are typically much smaller than digital audio files for similarmusical passages. However, MIDI music tends to lack the full resonance of symphony- qualitysound that can be achieved with digital audio. Speechsynthesisis the process by whichmachines, such as computers, produce sound that resembles spoken words. Speech recognitionrefers to the ability of machines to “understand” spoken words