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隆 Semiconductor

隆 Semiconductor

MSM6789A/6789L

GENERAL DESCRIPTION

MSM6789A/6789L

SBC Solid-State Recorder IC

The MSM6789A/6789L, an improved version of MSM6788, is a solid-state recorder developed using

the Sub Band Coding (SBC) method.

Just like MSM6788, the MSM6789A/6789L has a stand-alone mode and a microcontroller interface

mode. In the stand-alone mode, record/playback conditions can be selected from pins and the

MSM6789A/6789L can be controlled by a simple drive timing. In the microcontroller interface mode,

record/playback can be controlled by commands from the microcontroller, and more functions are

available than in the stand-alone mode.

The MSM6789A/6789L can directly drive serial voice ROM as external memory as well as serial

register or general-purpose DRAM* (1-bit

樓

or 4-bit

樓

type selectable) as external memories, which

allows a recording and playback circuit with fixed messages to be built easily. The method from

microcontroller is the same as the MSM6788.

* Only for MSM6789A

鈥?Difference between MSM6788 and MSM6789A

MSM6788

MSM6789A

General DRAM

Unavailable

Available

Unvoiced-part elimination function No

Yes

PCM playback

No

Yes

鈥?SBC method:

The SBC method divides voice frequencies into five bands and codes the component for each of

the bands separately, as shown below.

@f

s

=8.0 Hz

Gain

ch 1

ch 2

ch 3

ch 4

ch 5

3

kHz

0

1

2

f (Hz)

Note:

This data sheet explains a stand-alone mode and a microcontroller interface mode, separately.

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