Audition learning record

@(Knowledge)[Audition, Auspice Vinson]

Watch, stop, practice, rest, fight

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Sound related concepts

characteristic

1. Loudness

Subjective feeling of sound size (volume) , the amplitude and human distance from the sound source decision

Units of decibels (dB)

2. tone

The sound level of the frequency of the decision, the higher the frequency, the higher the pitch of the sound

Units of hertz (HZ)

• HZ per second through a fixed-point representation of the number of sonic number of cycles
• A wave cycle goes from 0dB/mute to fully open and then back to a full cycle
• Wave height is volume
• Wavelength is the distance between two peaks

3. Tone

The waveform determines the tone of the sound

Different materials have different characteristics, and the generated music waveforms are also different (square wave, sawtooth wave, sine wave, pulse wave)

• A: Wavelength
• B: Phase degree
• C: Amplitude
• D: One second

Interaction between sound waveforms (noise reduction principle)

• The same waves will reinforce each other
  

• Opposite waves will cancel each other out
  

Sampling frequency and bit rate (bit)

Common sampling frequency

• 44100
  • CD
• 22050
• 48000
  • Digital TV or professional audio sampling frequency

Soundtrack

• Mono
• stereo
  • Left and right channels

Bit depth (bits)

• Dynamic range of playing audio

The relationship between bit depth and decibels
Each increase of 1bit, an increase of 6dB

• 16-bit depth is generally used to meet general needs

New CD standard audio file

• Sampling rate: 44100HZ
• Bit depth: 16 bits

Movie standard

• Sampling frequency: 96000HZ
• Bit depth: 24 bits

file

wav,FLAC

• lossless compression
• Files are usually large

mp3

• Small file
  • Easy to save and transfer

AU interface

Work area

Wave Editor

Edit a single audio and process sound details in more detail

Multitrack editor

Complete mixing and sound effects processing

Spectrum frequency display

Suitable for handling human voice

• Remove noise or tail
  

Spectrum Tone Display

Suitable for handling music

tool

mobile

Disconnect

slide

Time selection tool

Can be used in two interfaces

Frame selection & lasso tool

Can only be used on spectrum display

• Used to select a part for editing
  
  

Brush tool

Similar to a mask, you can edit the frequency such as fade

Stain repair tool

Audio automatic repair function

• Repair the selected area with reference to surrounding audio features
• Tools to eliminate noise
  

Noise reduction processing

The sound made by the computer during recording

Approach

Adaptive noise reduction

Effect -> Noise Reduction Recovery

• Noise reduction range: determine the level of noise reduction: a value between 6 to 30dB works well
  • Noise Amount: The percentage of the original audio that contains noise
  • Benchmark: Adjust the basic criteria
  • Signal threshold: the critical value to trigger noise reduction
  • Attenuation rate: Determine the speed at which the noise processing drops by 60dB, fine-tuning this setting can achieve a greater degree of noise reduction and less distortion
    • Too short, the sound is foaming
    • Too long: there will be reverberation
  • Broadband reservation: keep the desired audio between the specified frequency band and the found distortion
  • High-quality mode: requires a lot of computing
    • Reduce FFT size and turn off high quality mode

Manual noise reduction

• Now the audio file captures a sample of point noise
• Effect-Noise Reduction/Restore-Noise Reduction (Processing)

• Adjust the noise reduction percentage for different audios
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• A: Drag the control points to change the noise reduction value in different frequency ranges
• B: Low amplitude noise
• C: High amplitude noise
• D: Threshold value, noise reduction below this value

Noise reduction for special noise

Saliva

The small sound produced by the opening and closing of the tongue

• A: Hiss
• B: crackling
• C: Rumble

Approach

1. Effect-noise reduction / recovery-automatic click removal,
   select strong or weak reduction
   
2. Repair tool

• Choose a repair tool
• Find the noise to be repaired in the county and urban area of ​​the spectrum
• Drag to erase

Pops and high-frequency hiss

Sharp tones cause too high frequency and too loud

• Cause sound distortion or hissing
  

Approach

• Select problem area or high frequency area
• Effect-noise reduction/recovery
• Reduce hiss
• Capture noise baseline

Volume is too low & too high

Select the area to adjust the amplitude

Murmur

Approach

1. Repair tool to repair

• Auto repair
• Select the area to be repaired
• Right click
• Auto repair selection

2. Delete directly

Insert background music (multi-track mix)

1. New multitrack mixing project
   
2. Open the music you want to insert and drag it to two different tracks
3. Open the mixer while playing
   
4. Add a fade-in effect
   
5. Save can only save its engineering project, need to go through file-export-multitrack mixing-the entire session