It is a sound source LSI for multi-function games, and is an LSI that combines a PCM sound source and a DSP for sound.
DATA
A bit is the smallest unit that represents 0 or 1. Eight bits are collectively called a byte, and 16 bits (or two bytes) are called a word. When the upper and lower bytes are divided into 4 bits, each is called a nibble.
Banpot (PAN-POT)
Localization: A function that determines the direction and position in which sound is heard.
Direct data (DIRECT DATA)
Sound that does not pass through the DSP, or even if it does pass through, without any effect, is called direct data (or dry data).
Effect data (EFFECT DATA)
When some effect is applied to the sound generated by the sound source through the DSP, the resulting sound is called effect data (or wet data).
MIDI standard (Musical Instrument Digital Interface)
A standard for communicating between an electronic musical instrument and a computer and exchanging pitches and lengths with each other.
This refers to a sound source that converts sound into PCM data, stores it in memory, reads it from memory during performance, and outputs the sound. PCM is to divide the sound (waveform) according to the time axis and replace each peak value with digital data. The data obtained by this work is called PCM data.
FM (Frequency Modulation)
Refers to frequency modulation. In the sense of sound source, it means FM sound source.
Linear
Represents a linear state. This means that the input-output relationship is proportional. Therefore, the fact that the waveform data is linear means that the peak value proportional to the magnitude of the data can be obtained. This means that the quantization steps are evenly spaced.
LFO (Low Frequency Oscillator)
A function generator that produces waveforms with frequencies lower than the human ear can hear. The waveform output of this LFO is used for modulation of amplitude, frequency, etc.
DSP (Digital Signal Processor)
It is a circuit dedicated to high-speed calculation that mainly performs calculations (multiplication / addition) at high speed. The DSP built into the SCSP is specialized for audio and is used as a means of producing effects called acoustic effects such as echo, reverb, chorus, and filter.
The number of samples
Indicates the number of waveform data.
dB (decibel)
This is a unit expressed using a logarithm to compare the volume and the like. Expressed as an expression
It will be.
Specifically, when the volume to be compared is twice the reference volume (waveform amplitude), the volume ratio is 6 [dB]. Also, 1x is 0 [dB], 3x is 10 [dB], and so on. Conversely, if the volume to be compared is lower than the reference volume, this value [dB] will take a negative value (negative value). For example, when it is 1/2 times the standard, it becomes -6 [dB].
Modulator
When multiple slots are connected, it refers to the slot on the side where modulation is applied. In the figure below, SLOT0 and SLOT1 are modulators.
Carrier
When multiple slots are connected, it refers to the slot on the side where modulation can be applied. In the figure below, SLOT2 is the carrier.
Timer This is a function that allows you to set the time required for the counter to increase by 1. Select the time and specify the time for each timer.
■ Manual notation
In this manual, the notation is as follows.
Binary number
Notated with a B at the end. For example, it is expressed as 100B. However, when it is 1 bit, B may be omitted.
Hexadecimal
Notated with an H at the end. For example, it is expressed as 00H and FFH.
unit
1K bytes represent 1,024 bytes. 1M bits are 1,048,576 bits.
MSB, LSB
The composition of bytes and words is that the left represents the high-order bit (MSB, Most Significant Bit) and the right represents the low-order bit (LSB, Least Significant Bit).
Undefined bit
Bits that are not defined in the sound source register and DSP register are indicated by "-". When writing data to undefined bits, write "0B".
