MS87V1021 Datasheet, PDF (44/63 Pages) OKI electronic componets – Recording and Playback IC with Built-in 2-Mbit DRAM

1Semiconductor
PEDS87V1021-01
MS87V1021
Retroactive Play Mode
Retroactive Play is another unique and handy operational mode that enables you to hear what you have missed a
short period ago. While you let the LSI continue recording in endless circular motion to the memory’s area
specified with the Area2 command, you can issue the Play or Play2 command to hear what you have missed, going
back to earlier data that the LSI has stored so far. This enables you to record sound in the past retroactively, which
differentiate your application from so called “Voice Reminder” type of applications. The Delay time, that is a time
length to go back to the past, can be defined by using the Delay command.
In addition, the LSI supports Cue/Rewind function that has been unavailable with conventional ADPCM
record/play chips. This provides you with faster search capability among recorded messages.
Record
Record operation goes on until the Play or Play2 command is issued
• One-time Playback with the Play command
Play
Issuing the Play or
Play2 command
• Continuous Repeat Playback with the Play2
command
Delay Time
Time length to go back to
the past
Play
Delay Time
Time length to go back to
the past
Issuing the Play or Play2 command during recording operation causes the LSI to stop recording.
44/63