HT8950 datasheet(5/11 Pages) HOLTEK

5 / 11 page

Functional Description

The HT8950 is a single chip LSI designed for

voice modulation. It provides 7 steps to shift the

frequency of an input voice signal up and down.

The chip is also equipped with two special ef-

fects; Vibrato and Robot.

The HT8950 includes a built-in amplifier, 8-bit

A/D converter and current output type of 8-bit

D/A converter in addition to a built-in SRAM.

The brightness of an LED indicator changes

with the volume of the input voice signal.

Power on initial

The HT8950 enters the Robot state right after

power is initially switched on.

Robot state

The system goes into the Robot state after the

ROB pin is triggered or power is turned on. In

this mode, an input voice can be converted into

a robot voice.

Vibrato

An output voice will be generated with a vibrato

effect when the VIB pin is triggered, regardless

of what state the system is in. The vibrato effect

is toggle activated. In other words, when a voice

output is playing with a vibrato effect, this ef-

fect can be eliminated by retriggering the VIB

pin. The rate of vibrato effect can be changed by

adjusting the resistance of the external resistor

between the OSC2 and Fvil pins.

Voice modulation

The HT8950 provides an 8-bit A/D and a D/A

converters with a sampling rate of 8kHz, ensur-

ing a voice output of high quality and with a

high S/N ratio. The chip includes 7 steps to shift

the frequency of an input signal. The voice

modulation is selected and determined by the

SW0~SW2 inputs.

Input

Step Mode

Speed

Ratio

SW2 SW1 SW0

Controlled by TGU

and TDG

Notes

UP3

UP2

8/5

UP1

4/3

NORMAL

DN1

8/9

DN2

4/5

DN3

2/3

Notes: The TGU switch elevates by one step

mode, and the TGD switch, on the other hand,

falls one step mode step by step as shown:

• The system changes to the Robot state after

the ROB pin is triggered, regardless of what

state the system is in.

• A voice output is accompanied with a vibrato

effect after the VIB pin is triggered, regard-

less of what state the system is in.

LED indicator

The HT8950 provides a LAMP pin to drive an

external LED. The brightness of LED changes

with the volume of the input voice signal.

HT8950

5th May ’98

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