Patent ID: 11869518
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 6:
7. An apparatus for determining an adaptive hysteresis for inter-channel time difference (ICTD) parameter in parametric audio coding, the apparatus comprising:
means for obtaining an ICTD estimate between a channel pair of a multi-channel audio signal;
means for low-pass filtering an inter-channel correlation (ICC) measure to obtain a long term estimate of a stability (ICCLP) of an ICTD parameter when a reliable ICTD estimate is obtained for a frame m;
means for using said stability estimate (ICCLP) to determine a hysteresis period, during which a previously obtained reliable ICTD estimate is used, when reliable ICTD estimates are not obtained; and
means for setting the ICTD to zero if reliable ICTD estimates are not obtained within the hysteresis period.