Audio Surveillance Guide

Author: Ethan Ace, Published on Apr 30, 2014

Audio for surveillance is a complex topic with a lot of confusion and poorly implemented systems out there. We regularly get questions from users, such as:

  • What kind of mic should I use?
  • Where should it be mounted?
  • How do I configure my system for best possible audio quality?

And finding the answers to these questions and others can be nearly impossible for those without an audio background.

So, in this guide, we aim to clear up the following topics:

  • Microphone types: Internal vs. external, mic vs. line level, mounting location, and directional vs. omnidirectional.
  • Sensitivity and range: Testing 3 cameras with internal microphones vs. a ceiling mount external units we bought from Louroe to see which perform best at distances up to 20'.
  • Audio configuration: Setting up the camera, client, and VMS for best performance.
  • Basic use: How to use your camera and VMS with audio inputs and outputs.
  • VMS considerations: Differences in operation, configuration, and export of audio from VMS systems. 
  • Door intercom: How to configure a camera and VMS for use as a door intercom, one of the most common audio applications. 

In this guide, we bought and tested two popular Louroe Electronics products, a ceiling mic with audio interface and a door intercom station:

***** *** ************ ** * ******* ***** **** * *** of ********* *** ****** *********** ******* *** *****. ** ********* get ********* **** *****, **** **:

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  • *** ** * ********* ** ****** *** **** ******** ***** quality?

*** ******* *** ******* ** ***** ********* *** ****** *** be ****** ********** *** ***** ******* ** ***** **********.

**, ** **** *****, ** *** ** ***** ** *** ********* topics:

  • ********** *****: ******** **. ********, *** **. **** *****, ******** ********, *** directional **. ***************.
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  • ***** *************: ******* ** *** ******, ******, *** *** *** **** ***********.
  • ***** ***: *** ** *** **** ****** *** *** **** ***** ****** and *******.
  • *** **************:*********** ** *********, *************, *** ****** ** ***** **** *** systems. 
  • **** ********:*** ** ********* * ****** *** *** *** *** ** a **** ********, *** ** *** **** ****** ***** ************. 

** **** *****, ** ****** *** ****** *** ******* ****** *******************, * ******* *** **** ***** ********* *** * **** intercom *******:

[***************]

Selecting ***********

***** *** *** *** ************** ** ********** *********:

*** **. **** *****: **** ****** ***********, **** ***** ****** ** ********* ******* *** two *******:

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  2. **** ***** ******* *** ******** ******* **** *** *****, *** require **** ****. **** ******* **** ***** ***** *****, ********* in ****** *****.

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****** *******:*********** *** ** ****** *************** (******* ** ***** ** *** directions, **** ****** ** ************) ** *********** (******* ** ** a ******** ******** *******) ********* ** ***** *** *** ** mounted *** *** *******.

*** *******, * *** ******* ** *** ******* ** * cell ***** ** ********* ****** ** ***************, ** ***** *** travel ** ******** **********. *******, * ********** **** **** ** ***** door ***** *** * *********** ***, ** *** ******* ******** the **** ** ********* **** ****** *** *********.

******** ********: ** ************, *********** *** **** ***** ******* *******, ******** ** the **** **** *** ******** ** *****. *******, **** ***** models *** **** *********, *** *** ** **** ***** ************ or ***** ******* ******** ** *** ********. *******, ** **** interview *******, *********** *** ** ******* ** *** ***** *** better ****** ** ****** ******* *******.

****** **********:** *** ********** **** ** ******* ** ***** ** ********, a ****** ********* ***** ****** ** ****. ******* ******* **** as ********** ** **** *** ****** ****** ********** ********. ****** resistant ****** ********* ******* ******** ****** ** ********* *** ******* ***** to ******* **** ******. *******, ***** ********** ******** **** ********** sensitivity **********, ** **** *** **** ** ** ********* ** compensate.

Built-In **. ******** ***********

**** ******* ******* *****-** ***********, *** ******** *** ** *** audio ** *** ************ ******, ***** ** ******** ********* ** required. *******, ***** *********** *** ********* ***** ******* **** ******** components, **** **** *********** *** **** *****. **** ***** **** **** usable ** ***** ***** ****** ******* ***** ** ********, **** as ********* ******* ** **** ***** *****, ***** ******** *** and ***** ************* *** *******.

*** ********** ***, **** ** **** ******** ** **** ****-**, built-in **** *** **** ****. *********** ** *** **** ** ** as ********* ** **** ** ****** ** ***** ******** ***** and ***** ********* ** **** ** ** ***** ** ***** closer ******.

*****-** **. ******** *******

** *********** *** ********** ******* ***** ** *** ***-** ***********, we ****** ***** *******' ******** **** ****** ********* ***** ************ *** (~$*** ******). *** ****** ********** ******* *** **** *********** ** *********** and ***** ********* ** ***, **** ***** ** **** ****** too *********, ******* ********** **** ******** **** ** ***** ***** and ******* ** *** ********* ****** *** ******* **** *****, or *** ********* ******, ****** *************** ** *-**'. 

*** ********** ***** ******* ***** *******. **** **** ********** ***** **** **** ****** (**.* **) ** **** *********. 

******** **********

**** ***** ******* ********* ***-* #*** ***** ************ ******* ** *** *****, ***** ******** * ******** * ******* mount ********** ** **** ** ** **-* ***** *********. ***** should ****:

  • **** ********** ******* ********** *** *********, ********* **** * ****** shielded ******* **** (**/* ** *** *****).
  • **-* ******** ***** ** *** **** *** ******** ** **** level ****** ** ****** *** ****** *** ** *.*** ****.
  • **** ****** ** ********* ** *** **-* *****, ****** ********** in *** ****** *** ******** ******.

Audio *************

****** ***** ************* ****** ******* *******. **** *** ** ****** as **/*** *** ***** *****, ***** ****** ***** ******** ******, ********* control ** *******, ******* *** ****** ********, *** ****. ** general, ***** *** *** ***************:

  • *****:*** (******** ***** ******) ****** ** **** ** *** ****** supports **. **** ***** *** ******** *** *** ***** *** offers ****** ******* ** ***** ******** **** *.*** ** *.*** which **** ********* *** **** ***.
  • ****:**** ******* ***** ******* ** ***** **** *** *** *** interface, ******** ********** ****** ** ** ****** ** ******* ** prevent ***** *** **********. 
  • *******:******* ***** ******* ***** **** **-** **/*, * ******* ******** considering *-* **/* ** ******* *** **** ** *******. ** do *** ********* ******** ****** **** ***** ** **/*, ** bandwidth ******* *** *** ** ******* * ****** ***** ************, and ********** ***** **** ******.

** **** ***** ** ****** ***** ************* ** ***** *** the ****** *** *********.

Audio ********* 

** *** ********, ***** *** ** *********, *** ***-*** ***** talkback ****, *** *** *** ********* ** *** ******. **** is ********* ************ *** ******* ** *** **** ****, ******** the **** ** **** ** ****** *** **********, *** **** to **** ***** * ** ***.

*** ********* ********* **** *** ****, **** **** ******** ********** complexity:

*** ******* ********* ***** **** *** ***** ****** ** ** monitored ** *** ****, ****** ******** ******* *** ** ********. This ** **** ** **** **** **** *** ********. ****** ******** cameras *** ** ****** *** ***** ****** *****, **** *** stream **** ** *****.

*** **** ** **** **** ** *-*** *****. *** *** client ******** **** ****** **** * **** ** ********* ********, and **** * ******** ****** ** ******** ***. **** ***** for * ****** **** ** **** ** ** ****, ******** the ******** ** ***** ******* *** ********* ******** ** *** time, *** **** ** *** ******.

**** ***** *********** ***** *** ******:

Door ********

*** ** *** **** ****** **** ** ***** ** ************ system ** ** * **** ******** ******. ** *** ********* examples ** *********** *** ** *******, *******, *** ********* *** Louroe *****-** **** ** ** ****** *** *** ****** *** this *******.

*** *******

**** **** ***** * ******* ********: * ******* ******** *** ********, calling ****** ***** *** *** **** ********, *** ******** ***** being ********.

****: **** **** *** ******** **** *** ********* ***** *******. ***** only ****** *** ***** ***** ** * **** ** ** exported *** ******, ** ***** ** *** ***** *** **** mixed ******** **** *** ******'* *****. ** ***** ******* *** *********. Users may ******** *********** **** ********* **** ***** ** (***** ********** ******).

******** ***********

** **** ***** ** ****** *** *** *****-** ******** ** an ** ******, ********* ***** **/*** *** ******* */* *** the ******** **********:

****, *** ***** *******, ** **** *.*** ***** ******** ***** *** ******* ************ ********* ** *********.

*** ***** *************

** **** ***** ** *********** *** * *** *** ** configured ** **** **** *** **** ******** *** ********** ****** to ******* * ****, ****** *****, *** ****** ***** ***** and *****. *** ****** ** **** ***** **** *************:

  • *** *** (** **** *******, *****) *** ** ********** ** record ***** *** ***** ***** ** ** ***** (** ******* in *** *******) ** ***** ** ******* **** ******* ** visitor ******* ***** ** ******** *** ********, ***** *** ********** activities, ******* ******* ******* ** ****** *** ** ****, ***.
  • ** ***** *** ***** *** *** ************ *********, ***** ********* should ** *** **** ****** **** *** ****** ************ ** recorded, ********* **-** *******, ** ** **** ** *** ***** is ******.
  • ***** ************* ***** *** ** ********, **** *** ***** ***** may ** ****** ** ******** ** * **** **** **** Exacq *** *********. **** ********** ***** **** **** ******* ***** or ***** ******** *** ** ******** **** *****, *** ****.

 

Comments (11)

**** **. ******!

** *****!

*** ***** "* *** ******* ** *** ******* ** * cell ***** ** ********* ****** ** ***************, ** ***** *** travel ** ******** **********".

***** ***** *** **** **** *** *********, ***** *** ** omnidirectional *** ****** ********* ***** **** *** ******* *** *** upper ******** ** *** *****, **** ******* ** ******* ** both ****** **** *** ****** ***** ** **** ** ******** out-of-phase ********* ***** **** *** ******* ***. ******* ** * final ****** ***** *** *** ** ** ***** ** **** may **** **** *** **** ** * ********/*****-******** ********** *** been ****, ** *** ** ******* ** ***** *** ****-*********** microphones?

***, *************** *********** ** ********** *****, *** ********* *** ***** *** ** be ****** *********** ** **** ** * **** *******. **** I *** ***** ***** *******, *** *******, **'* ******** ** when ** *** ********, *** *** ** **** *** ******* board *****. **' *****'* **** *** **** **** ** * difference, ** *** ***** ** * *** ************ ** ****. 100'? ********* *****.

**' *** **** * **********. *' ** ************* *** ** 20' ***** ** ***** ****. ***** **** ********* *** ** much ****** ** ******** **** ***** **** *********. ** *** loudspeakers *** **' ***** ** *** **** *****, ******* *** outboard ******* **** ***** * **** ********** ** ********* ************** of *** ***** ******.

*'** **** *** ****** ******** * *** **** ******** **** times **** ***** *******. **** *******...

****:

** ******* *** ******* **** **** ******* ********, *** ** have **** ***** ***** ******* ***** ** ** *********** **** to ****** ******** ** ********** (** ******* ***** ***** ******** with *********, **** *****, ******* *****, ***.)

** *** **** *** ********* ** ********* *** ********* ******* and **** ********* ***-** *** **** **** ** ***********?

**** ******,

**** *******

**** ** ***** ** ************ *** ******** *** **** * couple ** *******.

*****, *** *** *** * ******* ******* ***** ******** ******** to *** ******.**** *** ******* ***** *** ***** *** ** **** ****** ** *******. You *** **** *** ******* ***** ******************** **** ***'* **** ** ** ****. *** **** ** split *** ***** ** ******* ******, *** * ***'* ********* it.

*** *** **** *** ****** ****************-******* ********. ******** ****, *** ********, ****** *** *********** ** **** loud, *** *** *** **** **** *-*** ********, *******. *** advantage ** *** *** ** **** *** *** *** **** than *** ******* ** *** **** **, *** **** ***** or ***** ********. * ***** ** *** ***** ** *** trusted ****** ****** *** **** (*****, *****, ******) *** ***'* really ** *****.

**** **** ****?

****** *** ** ********* ******* - ***** ** ********* **** information (****, **** ** **** ***********) *** ***** ** **** topic - ********* (***, ***-**) **** **** **** ****** ***** it.

** ***** ** ***** ********** ** *** **** ************* *-*** audio ** ** **** ***** *** *** *** ********* **** this **** ***** ** * **, **** ***** ** ******** Explorer *** ******** *** **** ***** ****** ** ** *********. Mac ***** ***** **** ** *** ***** *** *-*** *****, and * ******* **** ** * ******* ** ***** *** only, *** *****. *** ****** ** ***-**** *** ***** ******* may ** * *** **** *** ****.

******, *****. **** ****** ***** ******.

***** ******* ****! ** **** **** **** *** ***-**** *** Verifact (******* ******) **** *** ** **** **** ***** ****** mounted ** **** ******* ** ****. ** **** **** ******** that *** ***** ****** ** ******* ** *** ****** **** streams ** *** ***, ** ****** ***** ** **** * hybrid ******** ** *** *** ***** ******* **** ****** *** audio ******** *** ** ****** **** **** *** ***** ****** in ************* ** ******* **** ***** **** **** *********** *****.

** *** *** ********** **** ***** ** *********** ***** ** with *** ******* ** **** **** ** *** ************ **** do *** *********** ** ** ***** ** ******* ******* ******* at * **** *** ***** ** ** *********. ** ***** we **** ********** ** * ****** *** ****** ********** ***** a ***** **** ****** *** ******* ***** *** ***** ** audio ** *** **** ***** *** ****** ***** ********* / listening *** *** ***** ** *** ********** ***** ****** **** the ************.

* **** **** * *** ******** ***** ***** ********* *** desired. *** ** **** *** * ****** ******* ***** *** desire *** ** ****** ******** ****** ** ***** ********** *** then ******* *** ***** ** ***. * **** * *** with ****** ******* *** ******** ******* ***********. *** ** *** rooms **** * ***********, ******* **** * ***********, *** *** last *** **** * ***********. **** ** **** **** *** desire *** *** * ********* ******* *** *** *** * room **** ** ****** ******* ** ****. **** **** *** mixed ******** ***** * ***** *** **** *** ** *** single **** ********** *** *** ****. *** ********** *** **** an ****** ****** **** ** ******** ***. *** ****** *** to *** *** **** *** *********** ***** ** ******* **** ******** ****** *********. * ****** *********** * ***** ** ********

*** ******* ****** *** ***** **' *** *** **** **** surface *******. *** ***** ** ********* ** ** ***** *** for **** *********.

* ***** *** **** **** **** *** ***** ** ********* to ****** *** *****, *** *** *** ****** ** ***** in *********** ** **** ********* *** ******* ****** ** ******. I **** ***** ****** ** *** *** ***** ***** ********. In *** **** **** * *********** * **** *** ***-* To **** **** ** ****** ******* ***********. **** ******** *** not *** ****** ****. *** ********* *** ** *** ****** recordings *** ** ****** ***** ****. *** ***** ******* ** not *** **** *** ***** ****, *** *** ******** *** perform ****. **** **** ******* *** ********* ****** **** *** on *** *** **** **** *** ***'* ******* ******** ********* for ** ************. **** ******** **** ************ **** * ***** AM ***** *** ****** ********* *** *** ** *** ***** interference ** *** **** ***** *** ** ** ********** *********, it ** ****** ** **** *** ****** ** ***** ** possible.

*** **** ******** ***** ************, *** *** *** *** ***** boundary **** *** ************ **** * ****** **** *** **** companies **** ** **-*** ***** ******* *** (******** **** ************) algorithms ********* *** *** **** ********* ************. * ****** *** of ***** ** ** ********* **** ** ** **** ** pick ** ********** ** **** ** *** ***** ******* ** the **** ** **** ******* ******* ***** **** ***** ************. The *** *** **** ** ****** *** *** ***** ******* very ****.

****** **** **** * ** *** ********** **** *** ** the ********* ****** ***** *** * ** ****** ******* ** personal ********** *** *** ** *** ****** *******.

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