Mask noise and handle privacy in the call center

On July 27, 2020

This special blog post is dedicated to a video that explains the advanced Noise Firewall technology for call centers that is implemented in both PBXMate for call centers and SoliCall Connect.

Echo Cancellation with negative echo tail

On May 7, 2017

Background Echo path/tail is one of the most fundamental parameters when performing echo cancellation. In previous posts, we elaborated on the importance of echo tail and we also provided a Do It Yourself (DIY) method to calculate the echo tail. In most usage scenarios, the value of the echo tail will be a positive one […]

call center quality – noise cancellation

On August 29, 2018

[EDITED] For an explanatory video please check the post on reducing noise in call centers. Background Call centers are crowded locations in which agents are sitting next to each other making phone calls to customers. As a result, these phones calls contain a lot of ambient noise that is caused due to the physical conditions […]

Noise reduction algorithms – PNR vs. RNR

On July 16, 2018

Background Recently SoliCall introduced the reference-based noise reduction (RNR). This new technology was added to our noise reduction portfolio which already contained profile-based noise reduction (PNR) and standard noise reduction. Following the RNR introduction, we got requests to elaborate on the difference between PNR and RNR as they both use a profile/learning mechanism. In this […]

Reference based Noise Reduction

On July 28, 2022

Background Ambient noise during phone calls is annoying especially when the phone calls are a significant part of your business. Let’s assume you run a call center or a shared workspace and there is temporary (or constant) source of noise that is picked up by the phones of the agents and therefore this noise is […]

Analyze the echo path yourself

On October 27, 2023

Background The echo path is one of the most critical component during echo cancellation. You might have already heard this term or any of its synonyms (e.g. “echo tail”). When discussing the echo path we usually talk about two different aspects: a. The stability of the echo path. How volatile is this parameter ? Is […]

Time manipulation and its impact on echo cancellation

On December 12, 2016

Background Time manipulation is a known technique in audio processing. It can be used to either compress the audio (resulting in speed-up) or expand the audio (resulting in slow-down). Usually this is done without altering the pitch and therefore without changing the fundamental signature of the voice.

Echo cancellation is now available for PJSIP

On May 15, 2016

Background PJSIP is an is a free and open source multimedia communication library. One of the most important components that influence the audio quality in VoIP communication solutions is the existence of a good echo cancellation. SoliCall’s acoustic echo cancellation software is a powerful echo cancellation technology that is also flexible to support and tune […]

Isolating the audio in VoIP networks

On March 2, 2016

Background In this post we would like to share with you a rare phenomenon we have seen in few sites that once it appears, it can cause a head ache to the network administrator. As opposed to the old telephony networks that was based on dedicated physical cables per call, usually twisted pair, the cables […]

How can echo suppression badly impact call quality ?

On January 16, 2016

Background Can phones/soft-phones with built-in echo suppression badly impact the audio quality? Surprising as it may sound the answer is positive. In other words, when a call center, or any other organization, purchase phones with built-in echo suppression it is jeopardizing the overall call quality. In order to analyze the reason for this phenomena we […]