Stereo Microphone Techniques

The Music Telegraph | Text 2019/01/21 [16:06]

Stereo Microphone Techniques

The Music Telegraph| 입력 : 2019/01/21 [16:06]

▲ Blumlein pair stereo setup

© Sage Audio

 

 

 

Stereo Microphone Techniques

 

 

 

Stereo Microphone Techniques:

- Coincident (means 'same time') stereo technics

- Use 2 identical microphones 

: Practically touching each other (1/2 inch apart)

: No time of arrival differences —> therefore => No Phase problems

: Will only have intensity (loudness) differences

: Stereo signal is 100% mono-stereo compatible may have the 3 coincident patterns in a single stereo Mic

 

 

Coincident patterns are:

1) XY

2) Blumlein

3) M-S

 

 

 

 

1. XY

- Uses 2 identical cardioid Mics placed at 90° to 135° angle to each other 

- Gets a “moderate stereo spread” with a “strong center image”

- Used for ==> drum overheads, small horn, back ground vocal sections, grand piano (close mic)

- Stereo imaging ==> excellent

- Only cue ==> Amplitude (No phase distortion)

- Mics outputs are equally panned left & right

▲ XY stereo technique



▲ XY technique for acoustic guitar   

© audio-technica



 

 

 

2. Blumlein

- Uses 2 identical bi-directional mics 90° angle to each other

- Basically same as XY technic except use of ribbon microphones

- Excellent for ambience recording

- See the Top picture

▲ Blumlein technique

© The Music Telegraph



 

 

3. M-S (Mid-Side)

- 1 cardioid mic facing source = Mid

- 1 bi-directional mic facing sideway = Side

- 1 de-coding matrix (matrix: switching pattern system)

- Those outputs are combined through a sum-and-difference decoder matrix

==> resolves outputs into a conventional X/Y stereo signal (M + S = X) and (M - S = Y)

- The Mid capsule pickups the direct sound

- The side capsules pickup ambient and reverberant sound

▲ M-S technique

 



▲ Recording acoustic guitar using M-S (Mid-Side) technique

© MXL Microphones



 

 

  

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