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LC83025

Sanyo Semicon Device
Part Number LC83025
Manufacturer Sanyo Semicon Device
Description Digital Signal Processor
Published Mar 22, 2005
Detailed Description Ordering number : EN4977A CMOS LSI LC83025E Digital Signal Processor for Karaoke Products Overview The LC83025E is a ...
Datasheet PDF File LC83025 PDF File

LC83025
LC83025

Overview
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 con...


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