US 12,483,657 B2
Receiver side noise reduction and speech enhancement for PSTN callers
Keith Griffin, County Galway (IE); Samer Lutfi Hijazi, San Jose, CA (US); Raul Alejandro Casas, Doylestown, PA (US); and Yusuf Ziya Isik, Edinburgh (GB)
Assigned to Cisco Technology, Inc., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on May 20, 2022, as Appl. No. 17/749,317.
Prior Publication US 2023/0421701 A1, Dec. 28, 2023
Int. Cl. H04M 3/56 (2006.01)
CPC H04M 3/568 (2013.01) [H04M 3/567 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method, comprising:
receiving, at a receiver, an audio codec stream, wherein the audio codec stream originates from a public switched telephone network (PSTN) caller;
determining, by the receiver and in real-time, a length of time associated with a look-ahead buffer of the audio codec stream;
inputting, by the receiver and in response to the audio codec stream originating from a public switched telephone network (PSTN) caller, the audio codec stream into an audio enhancement model trained with one or more audio enhancements to cause the audio enhancement model to apply the one or more audio enhancements to the audio codec stream to generate an enhanced audio codec stream specifically within the length of time associated with the look-ahead buffer of the audio codec stream as determined in real-time; and
outputting, by the receiver, the enhanced audio codec stream.