DC offset and Audio Filtering

On July 5, 2023

In this post we describe a phenomena called “DC offset” in audio signal and its impact on the quality of audio filtering like noise reduction, echo cancellation and automatic gain control. We say that a signal has a DC offset distortion when the mean amplitude of its waveform is not zero. A normal voice is […]

Sorry, what?

On June 2, 2022

In this post we would like to discuss a disturbance in phone calls that might happen from time to time: you are in a phone call but the voice of the other party is too weak making it had to understand. In this case you will initially try and increase the volume on your side […]

Noise during online courses

On November 22, 2018

The number of online courses has been increasing over the last years. Education institutes, including the most respectable universities, offer e-learning for an increasing share of their courses. Online training is also widely used by internal education centers in many organizations. Although e-learning is widely used world-wide, there are areas in which it is the […]

On November 20, 2016

Can you hear people that are sitting far away from the microphone? Have you ever joined a conference call where some of the participants were sitting in a conference room? Were you able to understand every word that these people were saying? Probably not. Usually you can clearly hear the people sitting close to the […]

On November 20, 2016

Background There are different scenarios in which calls are made using speakerphones. For example: In manufacturing floor where the employees want to have an open communication channel without the limitation of headset or handset. When using intercom devices. When more than one person needs to listen to the call (e.g. in conference rooms). When […]

On November 20, 2016

Background Many times we are asked for ways to cancel noise and improve audio quality in existing telephony networks. The majority of the requests come from call centers and SMBs that are looking for simple plug-and-play solutions to resolve audio quality issues that they are facing. Since most of these request arise for companies that […]

On November 20, 2016

Background One of the first steps SMBs take towards VoIP is to add ATA to their existing analog telephone network. There are many well known brands of ATAs in the market today like Linksys PAP2, Cisco PAP2T, Grandstream HandyTone and others. Regularly we are requested to improve audio quality in such telephony systems – especially […]

On November 20, 2016

Background For many years, Skype has been one of the most popular softphones. Since Skype is being used on many brands of hardware and multiple network connections, there are bound to be occasions in which the audio quality is not satisfactory enough. We, at SoliCall, are constantly being approached for advice on ways to improve […]

VoIP on Android – volume control

On January 16, 2016

Background In our previous posts we covered few of the difficulties that Android VoIP developers are facing – for example the challenge in providing high quality echo cancellation. In addition to the echo cancellation, the variety of hardware platforms that are running Android also introduces a challenge in controlling the volume of the voice.

On August 1, 2011

CPU Consumption One of the main problems in mobile devices is their limited CPU Power. As a result the delay in the audio signal is increased and from time to time portions of the audio signal might get lost. In order to resolve these problems, you need to verify that your VoIP application is optimized […]

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DC offset and Audio Filtering

Sorry, what?

Noise during online courses

How to control audio volume in conference rooms?

Audio Quality When Using Speakerphone During Phone Calls

Noise Reduction and Echo Cancellation for existing VoIP Networks

Improving Audio Quality with Analog Telephone Adapter (ATA)

Improving Audio Quality for Skype

VoIP on Android – volume control

Tips for Developing VoIP on Mobile Devices (Android,iOS,…)