Prior to these models, the microphone ADC is connected to the tone generator. The microphone analog-to-digital (ADC) converter is routed directly to the auxiliary processor. The Tyros 4, Tyros 5 and S950 have an auxiliary DSP processor for vocal harmony. This is more evidence for a higher internal clock frequency. The SWP70 read clock is 95.9616 MHz, while the SWP51L read clock is 45.1584 MHz. The DSP SDRAM is the same size: 4Mx16bits (8MBytes). EBUS interface: Receive controller data messages (e.g., pedal input, keyboard input, pitch bend, modulation, live knobs, etc.) from front panel processors.DSP SDRAM interface: Store working data for effect processing.Clock interface: Synchronize serial audio data transfers (generate multiples of Fs).Serial audio: Send/receive audio data to/from the DAC, audio ADCs, and main CPU.CPU interface: Communicate with the Main CPU (e.g., Renesas SH7731) via the parallel CPU bus.For more information about the PSR-S970 internal design, look here.įive interfaces are essentially the same as the SWP51L: Higher end models employ two SWPs in master/slave relationship and both SWPs share the same wave memory. This keeps the basis of comparison even although many characteristics (clock rates, DSP RAM size) are the same in higher end models like Tyros 5 or Motif. I am comparing SWP characteristics as deployed in the S970 (SWP70) and the S950 (SWP51L) workstations. The higher crystal frequency and faster memory read clocks lead me to believe that the SWP70 is clocked twice as fast as the SWP51L. Thus, it makes sense to derive Fs and its multiples from the chip-level master clock. This funky looking clock rate is a multiple of 44,100 Hz: The SWP70’s external clock crystal frequency is 22.5792 MHz versus 11.2896 MHz for the SWP51L. The SWP70 has much in common with the SWP51L, but also some very significant differences. The SWP70 replaces the SWP51L, which has been the mainstay in recent generations of Tyros, upper range PSR, Motif, and MOX series workstations. (“SWP” stands for “Standard Wave Processor.”) The SWP70 is a new TG family in a long line of Yamaha tone generators. As I mentioned in an earlier post, the Yamaha PSR-S770 and PSR-S970 arranger workstations have a new tone generator (TG) integrated circuit (IC) - the SWP70.
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