A digitial voice signal with a greater range of frequencies. Also branded as "HD Voice" by Polycom, the narrowband 300-3400 Hz frequency range of the traditional "toll quality" telephone call was broadened to 50-7000 Hz for wideband audio.Desk phones, smartphones and tablets increasingly support wideband audio to enhance the audio in a voice over IP (VoIP) phone call or the audio in a video call. Ordinary microphones and the analog-to-digital converters (ADC) in a computer's sound card are not limited to narrowband frequencies. This is why a voice over IP (VoIP) phone call from PC to PC often provides superior voice clarity than a traditional landline call and especially a regular cellphone call. See G.722.First in EuropeStarting in 2009, cellular carriers in Europe and around the world added support for wideband voice, while U.S. carriers delayed deployment until 2013.