HL13.AUG–Information Storage Devices, Inc.–RP
Voice-storage chips offer improved storage time and sound quality
Devices record/playback up to 90 s of voice, music, and sound effects
The ISD2545/60/75/90 voice-storage chips offer a voice storage capacity
ranging from 45 to 90 s–a four times improvement over the company's
initial such products. In addition, the new family of devices features
improved sound quality and low noise in playback mode. The chips store
multiple voltage levels into previously binary, two-level EEPROM memory
cells. This direct analog approach provides an 8:1 advantage over the
alternative digitized signal storage technology. In addition, the need for
external A/D and D/A circuits is eliminated, allowing a single-chip voice
solution. The ISD2500 family can be controlled manually by a pushbutton
mode or through a microcontroller interface. The address and control lines
can also be interfaced to a microcontroller and manipulated to perform a
variety of tasks, including message assembly, message linking, predefined
fixed message segmentation, and message management. The ISD2545/60/75/90
are available in plastic DIPs and in die form. An evaluation system that
allows record and playback demonstrations using simple controls is
available for use with the chips. In addition, a PC-based sound
development and programming system that provides the capability to
generate and edit audio recordings and then verify them using the ISD2500
devices is also available. (ISD2560, from $12.77 ea/100–available now;
Sound Development and Programming System, $1,950–available September.)
Information Storage Devices, Inc. San Jose, CA Karin Bootsma
408-428-1447 Fax 408-428-1422
CAPTION:
The ISD2500 family of voice-storage chips consists of four voice
record/playback devices with storage times ranging from 45 to 90 s.
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