Dpdo

Dpdo Product Suite

High-Precision DSD Audio Toolchain

Dpdo is a fully self-developed DSD audio processing toolchain with three core products:

ProductFunctionRole
DpdoEngineHigh-precision PCM → DSD conversion engineCore product
DpdoPackSACDSACD ISO authoring toolArchiving & release
DpdoPlayerDSD audio playerHigh-fidelity playback

Technical highlights:

DpdoEngine — High-Precision PCM→DSD Conversion Engine

Industry-first real-time PCM2DSD recording — any PCM sound card can record DSD masters with the same quality as a native DSD chain.

  • 15th-order IIR noise shaping — highest order in the industry, in-band noise down to -150 dB; verified in 7+ hours of continuous recording with zero pops/clicks
  • Full 64-bit double-precision processing — no truncation error, stable in high-order filtering and long recordings
  • Oversampling from 64x to 4096x, supporting IIR/FIR/CIFB/MASH multi-modulator architectures
  • GPU (OpenCL) acceleration, psychoacoustic noise shaping, EQ, harmonic saturation and more DSP tools

DpdoPackSACD — SACD ISO Authoring Tool

Pack DSF/DFF files into standard SACD ISO images, compatible with SCMS, Foobar, virtual drives and disc burning.

  • Full metadata injection: album, artist, cover art, genre, year, label, composer, conductor, barcode, ISRC
  • CUE track-sheet import with automatic track info and timestamps
  • Proprietary Dpdo DSD Disc format, supports DVD-R/RW burning
  • Compliant with the SACD Orange Book spec, suitable for commercial release

DpdoPlayer — DSD Audio Player

A native player optimized for DSD playback — outputs the DSD stream directly, bypassing the PCM resampling path.

  • Native DSD output, supporting DoP (DSD over PCM) and Native modes
  • Differential/BTL output mode for high-end DACs
  • Configurable channel layout with multichannel pass-through
  • Low-latency streaming mode for live monitoring

Three Real-Time Direct-Recording Modes — Industrial-Grade Stability

DpdoEngine offers three DSD direct-recording modes, verified by independent test labs:

  • DSD Native mode: drives native DSD hardware directly for a clean signal path
  • DoP mode: compatible with 90%+ of mid-range and high-end audio interfaces
  • PCM2DSD mode: the killer feature — record DSD masters with any PCM sound card. Spectral analysis and blind listening by three senior engineers confirm it is indistinguishable from native DSD

💡 Verified: 7+ hours of continuous recording with zero pops/clicks and zero dropouts.

Download the Dpdo suite at sonicbro.com — leave a contact for trial licensing and technical support.

Technical Overview

A Fully In-House DSD Processing Solution

Every layer of Dpdo — from core algorithms to the user interface — is developed in-house, with no third-party DSP libraries or commercial audio frameworks. This gives us exact control over every stage of the digital-to-analog conversion chain, delivering a truly end-to-end DSD processing experience.

64-Bit Double-Precision Computation

Most audio software uses 32-bit single-precision floating point internally. DpdoEngine uses 64-bit double-precision floating point throughout, pushing cumulative rounding error far below the threshold of audibility to theoretically unmeasurable levels. This matters most in high-order noise shaping and long-tap FIR filtering — every extra processing stage introduces new error, and double precision keeps the accumulation of these errors inaudible.

15th-Order IIR Noise Shaping

Noise shaping is the most critical stage in PCM-to-DSD conversion. DpdoEngine supports IIR noise-shaping filters from 3rd to 15th order — the higher the order, the better the in-band signal-to-noise ratio, and the higher the demands on computational precision and stability. 15th-order IIR noise shaping is among the highest orders publicly implemented in the industry.

DST Lossless Compression

A DSD audio file is roughly twice the size of CD-quality PCM. DST compression reduces DSD streams losslessly by 30–50% while remaining bit-exact on decode. DpdoEngine supports DST encoding natively — no external compression tool required.

A Complete Chain from Recording to Playback

The Dpdo suite covers the entire DSD production pipeline:

  1. Record — DpdoEngine records native DSD streams directly from compatible ADCs
  2. Convert — convert PCM masters or recordings to high-spec DSD
  3. Author — package tracks into SACD ISO images for archiving or distribution
  4. Play — DpdoPlayer outputs native DSD streams for true high-fidelity playback