LC83025 データシート ( Digital Signal Processor for Karaoke Products )

部品番号

LC83025

部品説明

Digital Signal Processor for Karaoke Products

メーカ

Sanyo Semicon Device

ロゴ

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Ordering number : EN4977A

CMOS LSI

LC83025E

Digital Signal Processor

for Karaoke Products

Overview

The LC83025E is a special-purpose karaoke DSP that

implements the signal processing required by karaoke

systems, including pitch shift, microphone echo, voice

muting and simple surround, with only a single 256Kb

external DRAM. Since the LC83025E includes built-in

A/D and D/A converters, it can also handle analog inputs

and outputs in addition to digital inputs and outputs. The

LC83025E uses serial transfer of coefficient data from a

microcontroller to handle changes in functions and

characteristics required for each application.

Features

• Applications

— Pitch shift

The LC83025E can shift the music pitch or the

microphone pitch by ±15 steps in 1/4 interval steps,

or ±1 octave in scale tone steps according to

command data sent from the microcontroller.

Furthermore, the pitch can be changed up to ±1

octave in arbitrary steps by setting internal

coefficients.

— Microphone echo

The LC83025E implements echo processing for the

signal input from the microphone A/D converter.

The amount of echo, the delay time and other

parameters can be changed by setting coefficients.

— Voice mute

The LC83025E implements processing that removes

monaural signal components included in the music

signal. This allows CDs with vocals to be used as

karaoke CDs. Command data is used to turn the

voice mute function on or off.

— Simple surround

The LC83025E implements a simple surround

function by adding delayed components to the music

signal. The LC83025E includes six sets of simple

surround coefficients as built-in preset data. These

values can be switched by sending command data.

Applications can implement their own original

surround effects by setting the coefficients.

However, the algorithm itself is fixed.

— Flexible input mixing

The LC83025E supports hybrid mixing of digital

and analog left and right channel song inputs, and

thus can handle a wide range of disk processing

configurations.

• Audio inputs and outputs

— Inputs: Digital - One system (stereo)

A/D converter - Three channels

— Outputs: Digital - One system (stereo)

D/A converter - Two channels

— A/D converter

Second order ∆∑ modulation - Three channels

— D/A converter

4× oversampling digital filters

plus second order noise shaper

plus 5-bit PWM system - Two channels

• Master clock: 768 fs

• External memory: Up to two 256K (64K × 4-bit)

DRAMs can be used

• Microcontroller input: Synchronous 8-bit serial data

• Supply voltage: 5 V single-voltage

• Package: QFP80E

Package Dimensions

unit: mm

3174-QFP80E

[LC83025E]

SANYO: QFP80E

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

62896HA (OT)/63095HA (OT) No. 4977-1/15

1 Page

Block Diagram

LC83025E

Signal Flow Overview

No. 4977-3/15

3Pages

Pin Circuits

Specification

TTL output

CMOS intermediate

current output

Analog output

Schmitt input

Low Schmitt input

Normal input

Input with built-in

pull-up resistor

Input with built-in

pull-down resistor

CMOS intermediate

current output

Low Schmitt input

N-channel open drain

intermediate current output

Normal input

Analog input

LC83025E

Circuit

Pins

ASO, LRCKO, BCKO, RAS, CAS, DREAD, DWRT,

FS384O, A0 to A8

P3, P4, SIAK, TEST6

DAOL, DAOR, ADL2, ADL3, ADM2, ADM3, ADR2, ADR3

SI, SICK, SIRQ, SRDY, (OSC1)

FS384I, BCKI, ASI, LRCKI

TEST1 to TEST5

RES

SELC, SAIF, SAOF

D0 to D7

P0 to P2

ADL1, ADR1, ADM1

No. 4977-6/15

6 Page

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合計 : 15 ページ

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