Mic Directionality

There is the severe lack of internal microphone directionality specifications or any sort of descriptions. They always speak about the battery, the internet and other irrelevant phone specifications. It is very problematic to our project but there are workarounds it but before, that I want to talk about microphone directionality

There are many types of directional mics

A mic that picks up signals from the front and back. useful for interview situations

A mic that is better for the front and sides, can give more directionality in 3 degrees with a little signal coming from the back

Another mic that has three degrees of the signal with none coming from the 180 degrees, captures front and side well.

The ideal microphone for our final project with wide angle for signals to come from to determine the directionality of the person speaking. In terms of applications, this is the most useful one for us.

But like mentioned in the beginning of this post, many companies doesn’t post much about the strength of their mics. In the previous post, I found out that there are many variation in mics even from phones in the same model, as it isn’t needed to be beefed up like a studio mic.

http://www.camfere.com/microphones-accessories-2329/p-d4212.html?currency=NZD&aid=cfgplanz&gclid=Cj0KEQjw5YfHBRDzjNnioYq3_swBEiQArj4pdDRzSMPGX7W0LYAXcdzPIo6nli6-NbHvl6NvmvL8NwoaAu8d8P8HAQ

This is a $5 directional microphone from the website above. Cheap with the sound sensitivity of -30dB which might seem short but it is only on a table and might be enough for a table discussion.

http://www.conrad.com/ce/en/product/1408696/Speech-microphone-RODE-Microphones-VIDEOMIC-ME-Transfer-typeDirect-incl-pop-filter

Technical data

Category Speech microphone
Transfer type Direct
Frequency response 100 – 20 000 Hz
Characteristics Cardioid
Features incl. pop filter
On/off switch No
Weight 34 g
Length 80 mm

Features

  • Compact and lightweight (8 cm/34 g)
  • Integrated TRRS plug to connect with the headset socket
  • Fitted for primary camera or selfie mode
  • Integrated 3,5-mm headphone jack allows play-through of audio while recording
  • 1/2“ condenser capsulel, Polar pattern: Cardioid
  • Frequency range: 100 Hz – 20 kHz
  • Sensibility: 22 mV
  • Equivalent Noise Level: 20 dBA
  • Maximum SPL: 140 dB.

It has more details and magnitude more expensive compared to the other one but it has higher sensitivity and high sensitivity.

In terms of prices, we can leave it to the budget of colab and could provide microphone for this activity.

 

Highlights & details

What is a Directional Microphone? (n.d.). Retrieved from http://www.learningaboutelectronics.com/Articles/What-is-a-directional-microphone

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