Arny Krueger wrote:

A DSD data stream is composed of pulses that are basically integrated to
produce an analog signal. Pulses have a value of either +1 or -1. Alternate
pulses with opposite polarities sum out to zero. If the pulses are
predominately +1, then the integrated signal goes positive. The more
predominately the pulses are +1, the faster the integrated signal goes
positive. If the pulses are predominately -1 then the integrated signal goes
minus, and so on.

Didn't that used to be called 1-bit DPCM?