| Subject | English | Japanese |
| comp., MS | audio codec | オーディオ コーデック (The digital encoding used to represent audio data) |
| comp., MS | narrowband audio codec | 狭帯域オーディオ コーデック (An audio codec that provides voice by using a sampling rate of 8 kHz) |
| comp., MS | wideband audio codec | 広帯域オーディオ コーデック (An audio codec that provides high-quality voice by using a sampling rate of 16 kHz) |
| comp., MS | Windows Media Audio codec | Windows Media オーディオ コーデック (A codec used to compress and decompress audio streams) |