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- 2. 2- Basic of Sound 2.1 Basic of Digital Audio Sound: a travelling wave that is an
- 3. How sound waves interact When two or more sound waves meet, they add to and subtract
- 4. 2- Speech Signal Frequency:300Hz-3kHz Sound Frequency
- 5. Audio signals Analog Signal: an electrical representation of sound originated by microphone, tape head. Loudspeakers or
- 6. Lifecycle of sound in Multimedia System
- 7. Procedure of audio digitalization conversion to a stream of numbers, and preferably these numbers should be
- 8. Procedure of audio digitalization Illustration Sampling means dividing continuous time into discrete time Quantization means measuring
- 9. Understanding sample rate Sample rate indicates the number of digital snapshots taken of an audio signal
- 10. 2- To reproduce a given frequency, the sample rate must be at least twice that frequency.
- 11. Understanding bit depth When a sound wave is sampled, each sample is assigned the amplitude value
- 12. dB(Decibel) dB is commonly used in acoustics as a unit of sound volume. 0dB is the
- 13. dBFS(dB relative to full scale) dBFS(dB relative to full scale) is a unit of measurement for
- 14. 2- Data Size =Sample Rate×Bit Size×#Channel/8(Byte/s) Affects of Data Size
- 15. 2- An audio file format is a file format for storing digital audio data on a
- 16. 2- The bit layout of the audio data (excluding metadata) is called the audio coding format
- 17. 2- *.WAV Standard audio file container format used mainly in Windows PCs. Commonly used for storing
- 18. DRM Dataflow Diagram
- 19. 2- Audio Acquisition i) Sound Recorder Software(eg. Sound Recorder in Win 7) ii) Recording Studio iii)
- 20. 2- 2.5 Digital Audio Compression Standards Introduction to Digital Audio Compression Compression Encoding: the process of
- 21. 2- Lossless Compression less space without losing any information. compression ratio of about 2:1 Lossy Compression
- 22. 2- Audio Compression Standards
- 23. 2- Comparison between common audio formats
- 24. 2- 1993, MPEG-1 Audio Layer III a digital audio coding format which uses a form of
- 25. 2- 2.6 Sound Card and Electroacoustic Equipment Sound Card An internal expansion card that facilitates input
- 26. 2- Integrated sound hardware on PC motherboards In the late 1990s many computer manufacturers began to
- 27. 2- Architecture of Sound Card Mixer receives inputs from both external connectors and D/A. It selects
- 28. 2- Audio Codec A single chip in soundcard encodes analog audio as digital signals and decodes
- 29. 2- Device Driver A low-level program that controls a device attached to a computer. Provides a
- 30. 2- General Characteristics It can be used in multimedia applications such as music composition, audio editing,
- 31. 2- Example Enjoy multi-channel cinematic sound Many sound cards come with 5.1 channel outputs so you
- 32. 2- Example Independent input sources Many sound cards come with independent line-in and microphone connectors, which
- 33. 2- Example Control and customize your audio Many sound cards come with audio processing software, which
- 34. 2- Audio Performance Sample Rate: 11.025 kHz (Speech) 22.05 kHz (Music) 44.1 kHz (Hi-Fi) Bit Size:
- 35. 2- Connectivity Input:line in jack, microphone in jack Output: headphone, mono, 2 channels(Stereo)、2.1/4.1/5.1 Channels (Surround) Quality
- 36. 2- Processor CODEC (Dependent of CPU, Cheap) DSP(Independent of CPU) Quality Parameters
- 37. 2- What is MIDI? MIDI (Musical Instrument Digital Interface): a technology to synthesize music using electronic
- 38. 2- There are actually three components in MIDI standard, which are the communications Protocol (language), the
- 39. 2- The MIDI protocol is an entire music description language in binary form like CPU machine
- 40. 2- MIDI connector is a 5-pin DIN connector used to send MIDI messages . A single
- 41. 2- When MIDI messages are stored on disks, they are commonly saved in the Standard MIDI
- 42. 2- Sequencer is the key component for MIDI music creation. A MIDI Sequencer (or simply sequencer)
- 43. 2- Example Drum sample 1 Drum sample 2 Bass sample 1 Bass sample 2 A combination
- 44. 2- Audio Processing Software (formerly Cool Edit Pro) Audio Editing Audio Effects Multitrack Processing Burning Audio
- 45. History 1990s, Syntrillium Software, Cool Edit, 2003, Adobe purchased Cool Edit Pro, Adobe Audition 1 2006,
- 46. Creative Cloud With the introduction of Creative Cloud branding, Adobe's licensing scheme was changed to that
- 47. Download and install apps Sync files and folders Add fonts Search for assets on Creative Cloud
- 48. 2- Workspace A View buttons and toolbar B Editor panel with zoom navigator at top C
- 49. 2- Waveform and Multitrack Editors To edit individual files, use the Waveform Editor. To mix multiple
- 50. 2- Workspace A Navigator B Timeline Ruler C Waveform Display D Spectral Display E Zoom Button
- 51. 2- Waveform Display Quiet audio has both lower peaks and lower valleys than loud audio. Channels
- 52. Spectral Display This view lets you analyze audio data to see which frequencies are most prevalent.
- 53. 2- Zoom audio Zoom into a specific time range In either the zoom navigator or the
- 54. 2- Workspace Navigating time and playing audio Navigate by scrolling Navigate with the Selection/View panel Current-time
- 55. 2- Importing, recording, and playing Connecting to audio hardware Configure audio inputs and outputs Choose Edit
- 56. 2- Importing, recording, and playing Creating and opening files Create a new, blank audio file Open
- 57. 2- Importing, recording, and playing Recording audio You can record audio from a microphone or any
- 58. 2- Importing, recording, and playing Monitoring recording and playback levels To monitor the amplitude of incoming
- 59. 2- Importing, recording, and playing Adjust recording levels for recording device Adjust levels if recordings are
- 60. Editing Audio Selecting audio for playing, copying, cutting, (mix)pasting, and deleting Select time ranges using Time
- 61. Editing Audio Remove artifacts automatically For the quickest repair of small, individual audio artifacts like isolated
- 62. Editing Audio Adjust amplitude using amplitude control By default, the visual amplitude control appears in a
- 63. Editing Audio History Panel The History panel lets you instantly revert back to any previous change.
- 64. Editing Audio EDIT>Converting sample types Convert the sample rate of a file Convert a waveform between
- 65. Exercise1 of Edit Audio Steps Open ex1File1 and ex1File2 Find and Copy “did” in ex1File2 Paste
- 66. Editing Audio Working with markers using mark panel Markers (sometimes called cues) are locations that you
- 67. Editing Audio Playlists A playlist is an arrangement of marker ranges that you can play back
- 68. Applying Effects Apply individual effects From any submenu in the Effects menu, choose an effect. Click
- 69. Applying Effects Apply groups of effects The Effects Rack lets you insert, edit, and reorder up
- 70. Applying Effects About process effects These processing-intensive effects can be applied only individually, so they aren’t
- 71. Applying Effects Use effect presets Many effects provide presets that let you store and recall favorite
- 72. Applying Effects Generate a simple waveform Choose Effects > Generate > Tones to create a simple
- 73. Applying Effects Generate Noise Generating noise is useful for creating soothing sounds like waterfalls and for
- 74. Applying Effects Reverb effects In a room, sound bounces off the walls, ceiling, and floor on
- 75. Applying Effects Background Noise Reduction The Noise Reduction effect dramatically reduces background and broadband noise with
- 76. Exercise3 of Noise Reduction Steps Create audio file Record “I finished my work on Monday” Mix
- 77. 2- Mixing multitrack sessions The Multitrack Editor can mix together multiple audio tracks to create layered
- 78. 2- Mixing multitrack sessions Create a new multitrack session Template: specify source files and settings such
- 79. 2- Mixing multitrack sessions Insert an audio file into a track Place CTI at the desired
- 80. 2- Mixing multitrack sessions Session (*.sesx) files Adobe Audition save multitrack sessions in session (.sesx) files
- 81. 2- Mixing multitrack sessions A Track controls B Zoom navigator C Vertical scroll bar D Track
- 82. 2- Mixing multitrack sessions Arranging and editing tracks Add or delete tracks Name tracks Move tracks
- 83. 2- Mixing multitrack sessions Editing multitrack clips Move a clip Copy a clip Remove a selected
- 84. 2- Mixing multitrack sessions Export multitrack mixdown files After you finish mixing a session, you can
- 85. Exercise 4 of Sound Remove Steps Mix cough with music in multitrack Remove cough using Sound
- 86. 2- Multitrack routing Buses, sends, and the Master track let you route multiple track outputs to
- 87. 2- Mixing multitrack sessions Audio tracks Audio tracks contain either imported audio or clips recorded in
- 88. 2- Mixing multitrack sessions Assign audio inputs and outputs to tracks In the Inputs/Outputs area of
- 89. 2- Mixing multitrack sessions Bus tracks With bus tracks, you can combine the outputs of several
- 90. 2- Mixing multitrack sessions Sends Sends let you route audio from a track to multiple buses,
- 91. 2- Mixing multitrack sessions Master track The Master track , which is the last in each
- 92. Exercise 5 of Multitrack routing Ex4.mp3 Clip1 Clip2 Clip3 Clip4 Bus A Master Bus B reverb
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