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Imagine living in a coastal area at risk of flooding. There is an early warning system in place so that if water levels rise significantly an emergency alert is sent out to affected areas. Audio alerts are played through loudspeakers to give emergency instructions to people in danger. In this scenario, hard-to-understand audio doesn’t simply cause inconvenience – it can put lives at risk.

For those living with the threat of floods, earthquakes, or bush fires, high-quality audio is not a luxury – it can be a matter of life and death.

Digital Signal Processing

At Axis, they understand the responsibilities that come with supplying network audio systems. That’s one of the reasons why all Axis network speakers come equipped with Digital Signal Processing (DSP) capabilities. DSP for public announcement is about analyzing and manipulating sound to improve speech intelligibility. In Axis network speakers, several sound optimization techniques – such as frequency optimization, loudness compensation and dynamic range control – are built into the speakers themselves to deliver excellent audio quality in any environment.

Danny Smith, a Senior Software Developer at Axis with responsibility for sound and audio quality, explains that there are many advantages to having everything on the edge rather than the old-fashioned approach.

High-quality audio

Traditionally, you might see a control room somewhere, containing a mixing console, equalizers, compressors, amplifiers and so on. With Axis, these tasks are done through edge processing in the speakers themselves, so you get the advantage of high-quality audio without the need for a control room.”

You don’t get distortion from electronic interference, and the sound signal remains strong, no matter how long the cables are"

It’s reliable too, because the signal doesn’t have to go through multiple pieces of equipment before it gets to the speaker, as it would in an old-fashioned setup.”

Plus, everything is 100% digital, from source to speaker, so the signal doesn’t degrade. You don’t get distortion from electronic interference, and the sound signal remains strong, no matter how long the cables are. The signal doesn’t weaken over distance, so speakers can be placed exactly where you want them.”

Axis speaker technology

The edge processing in Axis network speakers means they are frequency optimized, which gives the same characteristics to every speaker. As a result, they can combine without the need for manual tuning or configuration, and the system can be easily expanded just by connecting more Axis speakers.

Users can also remotely schedule speaker tests to make sure that they are functioning correctly. Every Axis network speaker has a built-in microphone which monitors its output. If the sound coming from the speaker is inadequate, the microphone picks this up and an alert is sent to the administrator. As Danny states, “If speakers are used in remote environments to warn of emergencies or to deter crime, then it’s crucial that you know they are working properly.”

Danny is happy to go into more detail about some of the automatic functions embedded into all Axis speakers.

Dynamic range control

Loudness compensation boosts those frequencies so that the listener doesn’t miss anything"

Dynamic range control is an important function. An audio signal will often have peaks and troughs in volume, and this feature can balance these to make sure that sound is broadcast at the ideal volume for listeners.”

Loudness compensation is another clever feature. If you have a ‘loudness’ button on your stereo, then you might be familiar with the basic concept. At low volumes, certain frequencies are less perceptible to the human ear. Loudness compensation boosts those frequencies so that the listener doesn’t miss anything. This happens automatically in Axis speakers, so they are great for background music in stores.”

It’s the application of edge processing in our speakers that makes this all possible”, Danny concludes. “For users, it means that there is no need to go onsite to control audio quality, there is no risk of equipment interfering with the audio signal, and there’s no reliance on individuals programming speakers according to what they subjectively think sounds good. Axis takes responsibility for all these things. For listeners, it simply means that announcements are easier to understand!

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