System for lost packet recovery in voice over internet protocol based on time domain interpolation

A method of lost frame recovery in a VoIP system, comprising:

• receiving a plurality of packets having at least one frame of data per packet in the VoIP system, wherein a frame of data comprises a plurality of digitized sound samples taken in a predetermined time period;
• detecting a missing frame of data in the plurality of packets;
• creating a replacement frame of data to replace the missing frame of data by using a frame of data immediately prior to the missing frame of data;
• applying a energy reduction function to the replacement frame of data, wherein the energy reduction function decreases energy levels of each digitized sound sample in an ever increasing manner, starting with a first digitized sound sample and continuing to a last digitized sound sample for the plurality of digitized sound samples in the replacement frame of data;
• presenting the replacement frame to a user of the VoIP system;
• repeating the detecting, creating, applying and presenting operations until no missing frame of data is detected;
• applying a energy restoration function to the replacement frame of data, wherein the energy restoration function increases energy levels of each digitized sound sample in an ever increasing manner, starting with a first digitized sound sample and continuing to a last digitized sound sample for the plurality of digitized sound samples in the replacement frame of data;
• and
• presenting the replacement frame of data to the user of the VoIP system.

A device for lost frame recovery in a VoIP system, comprising:

• an input packet reception module to receive a plurality of packets having at least one frame of data per packet in the VoIP system;
• a lost packet interpolation module, including an energy reduction function, to detect a missing frame of data received from the input packet reception module and interpolate a frame of data using a prior frame of data;
• and
• a frame playback module to present the frame of data interpolated by the lost packet interpolation module to a user of the VoIP system.

A device for lost frame recovery in a VoIP system, comprising:

• an input packet reception module to receive a plurality of packets having at least one frame of data per packet in the VoIP system, wherein a frame of data comprises a plurality of digitized sound samples taken in a predetermined time period;
• a lost packet interpolation module to detect and replace a missing frame of data in the plurality of packets, the lost packet interpolation module comprising:
• a current frame unavailable function to create a replacement frame of data to replace the missing frame of data by using a frame of data immediately prior to the missing frame of data and an energy reduction function, wherein the energy reduction function decreases energy levels of each digitized sound sample in an ever increasing manner, starting with a first digitized sound sample and continuing to a last digitized sound sample for the plurality of digitized sound samples in the replacement frame of data;
• a current input frame available and at least one frame lost function to apply a energy restoration function to the replacement frame of data created by the energy reduction function, wherein the energy restoration function increases energy levels of each digitized sound sample in an ever increasing manner, starting with a first digitized sound sample and continuing to a last digitized sound sample for the plurality of digitized sound samples in the replacement frame of data.

A computer program embodied on a computer-readable medium to perform lost frame recovery in a VoIP system, comprising:

• an input packet reception module code segment to receive a plurality of packets having at least one frame of data per packet in the VoIP system;
• a lost packet interpolation module code segment, including an energy reduction function code segment, to detect a missing frame of data received from the input packet reception module code segment and interpolate a frame of data using a prior frame of data;
• and
• a frame playback module code segment to present the frame of data interpolated by the lost packet interpolation module code segment to a user of the VoIP system.

A computer program embodied on a computer-readable medium to perform lost frame recovery in a VoIP system, comprising:

• an input packet reception module code segment to receive a plurality of packets having at least one frame of data per packet in the VoIP system, wherein a frame of data comprises a plurality of digitized sound samples taken in a predetermined time period;
• a lost packet interpolation module code segment to detect and replace a missing frame of data in the plurality of packets, the lost packet interpolation module code segment comprising:
• a current frame unavailable function code segment to create a replacement frame of data to replace the missing frame of data by using a frame of data immediately prior to the missing frame of data and a energy reduction function code segment, wherein the energy reduction function code segment decreases energy levels of each digitized sound sample in an ever increasing manner starting with a first digitized sound sample and continuing to a last digitized sound sample for the plurality of digitized sound samples in the replacement frame of data;
• and
• a current input frame available and at least one frame lost function code segment to apply an energy restoration function code segment to the replacement frame of data created by the energy reduction function code segment, wherein the energy restoration function code segment increases energy levels of each digitized sound sample in an ever increasing manner starting with a first digitized sound sample and continuing to a last digitized sound sample for the plurality of digitized sound samples in the replacement frame of data.

A method of lost frame recovery in a VoIP system, comprising:

• receiving a plurality of packets having at least one frame of data per packet in the VoIP system;
• detecting a plurality of consecutively missing frames of data within the plurality of frames having data;
• replacing the plurality of consecutively missing frames of data by gradually reducing the energy level of a prior frame having data that appears immediately before the plurality of consecutively missing frames of data;
• increasing the energy level of a last missing frame of data of the plurality of consecutively missing frames of data to a full energy level when the last missing frame of data appears before a frame having data;
• and
• presenting the plurality of frames of data to a user of the VoIP system.