. . {Audio or video recording} [2013???01]G11B 2020/10546. . . . {specifically adapted for audio data} [2013???01]G11B 2020/10555. . . . . {wherein the frequency, the amplitude, or other characteristics of the audio signal is taken into account} [2013???01]G11B 2020/10564. . . . . . {frequency} [2013???01]G11B 2020/10574. . . . . . {volume or amplitude} [2013???01]G11B 2020/10583. . . . . . {param