US 12,250,340 B2
Systems and methods for improving audio quality using feedback control
Michael Kovacevic, Waterloo (CA); and Alexandru Gabriel Roman, Waterloo (CA)
Assigned to TEXTNOW, INC., Waterloo (CA)
Appl. No. 17/637,354
Filed by TEXTNOW, INC., Waterloo (CA)
PCT Filed Aug. 18, 2020, PCT No. PCT/IB2020/057779
§ 371(c)(1), (2) Date Feb. 22, 2022,
PCT Pub. No. WO2021/038385, PCT Pub. Date Mar. 4, 2021.
Claims priority of provisional application 62/890,768, filed on Aug. 23, 2019.
Prior Publication US 2022/0294898 A1, Sep. 15, 2022
Int. Cl. H04M 3/22 (2006.01); H04M 7/00 (2006.01)
CPC H04M 3/2227 (2013.01) [H04M 7/006 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A communications system comprising:
a source device and a destination device, each coupled to one or more of a wide-area internet protocol (IP) network, a public-switched telephone network;
a Voice over Internet Protocol (VoIP) service coupled to the wide-area IP network and the public-switched telephone network, the VoIP service configured to support a voice call between the source device and the destination device;
wherein, for at least one leg in the voice call:
an encoding device is configured to encode an analog audio stream to a digital audio stream according to one or more input parameters, the input parameters including variable input parameters;
a receiving device is configured to send a quality indicator to the encoding device, the quality indicator representing a quality of the digital audio stream received at the receiving device, wherein the receiving device is separate from the communication device; and
the encoding device is configured to, at a feedback controller, determine updated variable input parameters for encoding a subsequent analog audio stream.