Perfect speech quality in the hardest conditions



Since its foundation over 40 years ago, our partner Commend has been researching and perfecting the speech quality of its systems to provide customers and users with the highest possible speech intelligibility even under the harshest conditions.

In the multi-faceted world of Intercom acoustics, everything down to the smallest influencing factor is taken into consideration when it comes to perfecting acoustic qualities – from basic physical sound properties to signal processing and the selection of individual electronic components.

In doing so, Commend keeps extending the technical frontier.

Passion for Audio by Commend



Hear the Difference

eHD Voice – Enhanced HD Voice by Commend  transfers the audio signal at a bandwidth of 16,000 Hz, thus capturing the entire frequency spectrum of the human voice.

Please note: The quality of the audio samples depend on the quality of your PC speakers. Click the yellow, green or blue sections below to hear the audio.

Audible range

20 Hz
3,500 Hz
7,000 Hz
16,000 Hz
20,000 Hz

PUBLIC TELEPHONE STANDARD

The basic audio bandwidth is 3.5 kHz. This is what we are all familiar with on the telephone. Overall, 80 percent of the sound frequencies involved in speech transmission are beyond the capabilities of the public telephone standard.

INTERCOM STANDARD AND MOBILE TELEPHONY

7 kHz quality means a clear improvement in clarity and intelligibility. However, this still covers less than 50% of the audible frequency range. Critical frequencies that are needed for consonant differentiation are still missing.

SPEECH BECOMES TOTALLY NATURAL.

Enhanced HD Voice by Commend transfers the audio signal at a bandwidth of 16,000 Hz, thus capturing the entire frequency spectrum of the human voice. As a result, voice communication and emergency calls are transmitted at a level of clarity literally unheard-of so far.