Rainbow Electronics APR9600 - Manual (Page 3)

INTEGRATED CIRCUITS INC.
- APR9600
http://www.aplusinc.com.tw Page / 17 Ver2.1 3
Figure 2 APR9600 Block Diagram :
3.1 Message Management :
3.1.1 Message Management General Description
Playback and record operations are managed by on-chip circuitry. There are several
available messaging modes depending upon desired operation.These message modes
determine message management style, message length, and external parts count.
Therefore, the designer must select the Appropriate operating mode before beginning the
design. Operating modes do not affect voice quality; for information on factors affecting
quality refer to the
Sampling Rate & Voice Quality section.The device supports five
message management modes (defined by the MSEL1, MSEL2 and /M8_OPTION pins
shown in Figures 1 and 2):
ƒ Random access mode with 2, 4, or 8 fixed-duration messages Tape mode, with multiple
variable-duration messages,provides two options:
- Auto rewind
- Normal
Modes cannot be mixed. Switching of modes after the device has recorded an initial
message is not recommended.If modes are switched after an initial recording has been
made some unpredictable message fragments from the previous mode may remain
present, and be audible on playback, in the new mode.These fragments will disappear after
a Record operation in the newly selected mode.Table 1 defines the decoding necessary to
choose the desired mode.An important feature of the APR9600 Message management
capabilities is the ability to audibly prompt the user to change in the device's status through
the use of "beeps" superimposed on the device's output. This feature is enabled by
asserting a logic high level on the BE pin.