Over the past year, marketers have embraced mobile codes such as Quick Response codes and other mobile components in their campaigns. But in the past six months, a different type of mobile code, one involving audio activation has gained traction in commercials, television shows and music videos. These codes, nicknamed “Audible QR codes” provide users with mobile-enabled content after they use their smartphone to respond to audio prompts.

With audible codes, smartphone apps quickly listen, process and respond to pre-recorded audio prompts, such as character voices on TV sh…