If you’ve never considered having an audio component with your surveillance system that may be because analog CCTV systms\u00a0require separate audio and video cables to be installed from end to end which becomes difficult and costly over long distances.\u00a0 IP\u00a0cameras\u00a0make the implementation of audio\u00a0a lot simpler\u00a0because the audio and video information are sent over the same network cable eliminating the need for extra cabling.<\/p>\n
More and more IP camera audio is becoming a\u00a0common feature\u00a0not only because it’s\u00a0easier\u00a0to\u00a0process over a network cable but also because the importance of this\u00a0additional surveillance medium is now being recognized.<\/p>\n
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Having audio integrated into your surveillance simply gives you more information about a situation.\u00a0 Many times something is brought to our attention first by what we hear, not what we see.\u00a0 Car alarms, gunshots, breaking glass, and screams will not be recognized by a surveillance camera without audio.\u00a0 With 360\u00b0 coverage, an event happening behind a camera can still be detected.<\/p>\n
In the same way that an IP camera can analyze video,\u00a0they can intelligently analyze audio as well.\u00a0 As noted above, audio can hear what the video cannot see.\u00a0 Audio detection complements video motion detection very well because it reacts to events in areas that are too dark for the video motion detector to pick up on.<\/p>\n
Audio detection alarms can be programmed so that when any sound (glass breaking, voices in a room, etc.) is detected, they can trigger an IP camera to:<\/p>\n
Audio detection can be enabled all time, at specific times, or disabled.\u00a0 It can also be configured to trigger an event if a sound level rises above, falls below, or passes a certain level of sound intensity.\u00a0\u00a0Sony IP Cameras<\/a> has a great video demonstration of this function here:<\/p>\n Some of the applicable Sony IP cameras and video servers <\/a>that have this feature can be found here:<\/p>\n If you’re considering audio for your appliction your intended use should be clear because it can affect which IP cameras you can select as there are three audio modes available:<\/p>\n For example, Axis offers a camera, the Axis 207MW <\/a>that offers one-way audio with a built in mic while the Axis M1054 <\/a>offers two-way audio support with a built-in mic and speaker.<\/p>\n Features such as noise cancellation and echo cancellation are also available that\u00a0reduce background noise or eliminate feedback.\u00a0<\/p>\n Audio compression and audio bit rates, just like video compression and video bit rates, are an important consideration when calculating total bandwidth and storage requirements<\/a>.<\/p>\n Just like video, audio compression uses a codec to reduce the size for efficient transmission and storage.\u00a0 Some audio codecs support CBR (constant bit rate) mode only or both CBR and VBR (variable bit rate)\u00a0– these factors affect quality and file size.<\/p>\n Bit rate\u00a0is an\u00a0important audio setting because it determines the level of compression or, quality of the audio.\u00a0 Generally speaking, the higher the compression level = the lower the bit rate = the lower the audio quality.\u00a0<\/p>\n Audio and video are two separate packet (data) streams that are sent over a network.\u00a0 For audio and video to play back perfectly syncronized, the two packets must be time-stamped so that they match up.\u00a0<\/p>\n If you have any questions on how to\u00a0enhance and extend your surveillance system with the use of audio, please\u00a0call IP Camera Supply at 866-885-4853.<\/p>\n","protected":false},"excerpt":{"rendered":" If you’ve never considered having an audio component with your surveillance system that may be because analog CCTV systms\u00a0require separate audio and video cables to be installed from end to end which becomes difficult and costly over long distances.\u00a0 IP\u00a0cameras\u00a0make the implementation of audio\u00a0a lot simpler\u00a0because the audio and video information are sent over the… Continue reading \n
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Three Audio Modes<\/h2>\n
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Audio Compression & Audio Bit Rates<\/h2>\n
Audio\/Video Syncronization<\/h2>\n
Best Practices For Audio Implementation<\/h2>\n
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