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日本电气公司（ＮＥＣ）研制出一种如同信用卡一般大小的电子音乐卡片，它能存储和播放半小时的音乐节目。由于采用微电路代替了电机传动部分，因此，这种卡片式放音机比便携式磁带单放机要小巧轻便得多。 不过，这种卡式放音机的售价不菲：每张电子音乐卡售价高达１５００美元
NEC has created an electronic music card of the same size as a credit card that stores and plays half an hour of music. Due to the use of microcircuits instead of the motor drive section, the card player is much smaller and lighter than a portable tape player. However, this cassette player costs a lot of money: each electronic music card costs as much as $ 1500