![]() ![]() The ADC pins sense the front panel knobs, pitch bend wheel, master volume and battery condition. Yamaha designs typically sense the presence of AUX IN and PHONE connections, too. They also send data to the LCD panel via an LCD driver. The digital I/O pins sense the key and front panel switches and encoders. Serial I2S interface for incoming and outgoing digital audio.Low resolution analog-to-digital conversion (ADC).USB to Host interface (USB1.1 full speed).SH RISC instruction set architecture (ISA).This boost in spec is due to a new central processor, the SWX03: ![]() ![]() Newer entry-level keyboards, such as the Piaggero NP-32 and the PSR-EW410, have received a boost in polyphony (and DSP effects) over their respective predecessors. Polyphony is limited to 32 voices due to the relatively low memory transfer bandwidth between the SWL01 and flash memory. The embedded software program and sound waveform data (AKA “the samples”) are stored together in a single flash memory device. The SWL01 is a high volume LSI part which combines a microprocessor, tone generation and DSP resources into a single integrated circuit. Up until the last few years, Yamaha’s low-end keyboards were based around its proprietary SWL01 processor. Last August, I took an in-depth look at the internal design of Yamaha’s entry-level, low-cost keyboards.
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