语音芯片1420的使用程序。ISDl420为ISD公司出品的优质单片语音录放电路，单片录放时间8～20 s音质较好。-Procedures for use of voice chips 1420. ISDl420 for the ISD chip company produced high-quality voice playback circuitry, single playback time of 8 ~ 20 s in better sound quality.