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Optimize music files
to reach your device’s sound quality limit,
get compatible audio format or save disk space.
accurate audio file converter software for
music production and discerning music lovers
FLAC, WAV, AIFF, ALAC, SACD ISO, DSF, DFF, mp3, m4a, CD...
We think about quality. You just work with music.
If you buy "AuI ConverteR PROduce-RD" (2023/12.x version) from 24 August 2023 to 24 October 2023, you will get free update to version 2024 (13.x) after its release.
DSD converter is software to convert Direct Stream Digital audio files to or from other formats. DSD sound files have extensions DSF, DFF, ISO (SACD ISO). PCM multi-bit formats (WAV, FLAC, AIFF, mp3, etc. files and CD-audio disks) can be used as source or target. Also, the such converter can resample DSD files. Read below how the converter works.
- How do I convert audio to/from DSD?
- How to convert PCM to DSD files
- What is DSD format
- How DSD converter works
- DSD modulator (sigma-delta modulator, convert to DSD)
- DSD demodulator (convert from DSD)
- DSD resampling
- Frequently Asked Questions
- Articles about sigma-delta modulation
- Read more
How do I convert audio to/from DSD?
Read how to convert DSD to/from PCM audio files [tutorials]:
- DSD to WAV, FLAC, PCM >
- WAV, FLAC, PCM to DSD >
- SACD ISO to DSD >
- SACD ISO to WAV, FLAC, PCM >
- DSD to DSD >
How to convert PCM to DSD files
You can convert PCM to DSD audio files:
- Start AuI ConverteR software
- Push Open files button and select PCM music files (.wav, .flac, AIFF, mp3, or others).
- In the main program window, select the output DSD format (.dsf or .dff).*
- In the main program window, select sampling rate and bit depth.
- Select output file directory.
- Push Start button and wait for the end of the conversion.
DVD-audio/video, Blu-Ray, DVD/BluRay/CD ISO are NOT supported.
For Modula-R version, SACD ISO, DSF, DFF are supported in proper configurations.
For ISO tracks, DSF, DFF longer than 3 minutes, FREE edition mutes 2-second silence in the output middle and has other restrictions
Free version has processing sound quality identical commercial editions.
How to convert DSD to PCM audio files read here...
Minimum price options
What is DSD format
Format DSD is an implementation of 1-bit sigma-delta modulation. Range of sample rates that multiple 44100 Hz is used:
- 2.8 MHz = 2 822 400 Hz = 44100 Hz x 64 times;
- 5.6 MHz = 5 644 800 Hz = 44100 Hz x 128 times;
- 11.2 MHz = 11 289 600 Hz = 44100 Hz x 256 times;
- 22.6 MHz = 22 579 200 Hz = 44100 Hz x 512 times;
- 45.2 MHz = 45 158 400 Hz = 44100 Hz x 1024 times;
Bit depth is 1 bit.
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How DSD converter works
Software DSD converter can contain inside:
1. PCM (multibit) modulator to delta-sigma modulation (1-bit), or
2. Sigma-delta demodulator (1-bit) to PCM (multibit), or
3. Both: modulator and demodulator.
4. Resampler and other processing.
DSD converter structure
DSD modulator provides a decreasing of bit number. It leads to increased noise level (quantization error).
The most useful part of an audio signal is located in the range 0 ... 20 kHz. The modulator "pushes" the noise energy to the range above 20 kHz. It's called "noise shaping".
Demodulator provides filtering of this noise. After the filtering, the most useful audio signal remains only. Practically, some artifacts remain in the demodulated signal.
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DSD modulator (sigma-delta modulator, convert to DSD)
A sigma-delta modulator (PCM to DSD) is sophisticated audio processing. It is a system with feedback. Hence it can lose stability. If the sigma-delta modulator (DSD modulator) loses stability, needs to restart it. As rule, it can't return to stable mode without external impact.
In general, design of sigma-delta modulator is a compromise between stability and noise level. More significant pushing of noise energy out of audible range may lead to stability loss. DSD modulator can lose stability due to overload.
For achieving a better signal/noise ratio inside audible range and keeping stability, the frequency band out of audible range must have a reserve by width. It may be achieved by increasing the sample rate.
Sample rate increasing is an easier way to have a wider band with lower noise.
Unfortunately, the author doesn't know exactly history of DSD creating. But, looks like, DSD64 sample rate was designed for transmitting 20 kHz band. As rule, a DSD demodulator design is easier, comparing a PCM one (read more). So replacement of 44 kHz/16 bit to DSD64 may give some technical advantages for implementation.
For transferring of 100 kHz-band signal with keeping or decreasing the noise floor, the easiest way is sample rate increasing.
Read more about sigma-delta modulator >
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DSD demodulator (convert from DSD)
Sigma-delta demodulator (DSD to PCM) or DSD demodulator is a low-frequency filter, that removes modulation noise. The noise is located above the audible range.
This filter has 3 features:
- passband (minimum 0 ... 20 kHz);
- stopband (band where DSD modulator noise is suppressed);
- transient band (band between pass and stop bands).
A wider transient band allows decreased ringing audio, but pass more energy of noise of DSD modulator.
If expand passband, DSD's noise energy in the band is also increased. If the passband becomes narrower, ringing is increased.
So DSD demodulator is a balanced technical decision.
Read more about DSD decoder >
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Before resampling a file, DSD is converted without losses to a multi-bit audio stream suitable for processing. After it, the stream is processed and converted back to DSD via modulator.
Resampling 1-bit audio cause little losses, comparable with losses for PCM resampling. There are losses defined by distortions of used implementation of processing.
However, the playback apparatus may have different distortion levels for various sample rates. Hence, resampling may give benefits, if DSD is converted to a sample rate that causes minimum distortions on a used DAC.
Resampling DSD audio file
for sample rate that causes minimum distortions on a used DAC
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Frequently Asked Questions
Read the guide on how to convert mp3 to DSD files...
Read manuals on how to convert:
- SACD ISO files...
- DSD to WAV, FLAC, mp3 and other PCM files...
- WAV, FLAC, mp3 and other PCM files to DSD ...
- DSD to DSD files...
Yes. Read how to convert PCM files to DSD format...
Read the article on how to convert FLAC to DSD files...
Read manual on how to convert DSD to FLAC files...
Read how you can convert DSF to FLAC...
You can convert FLAC to DSD, if it gives audible advantages of sound quality on your musical setup.
Digital conversion of DSD (2.8 MHz or more) to PCM (in instance, 24 bit / 96 kHz) is downsampling by nature.
Without filtering, downsampling causes spectrum folding distortions.
Thus, no way to convert DSD to PCM without filtering in the digital domain.
There is no mathematical difference between DSD and PCM for audio processing.
And, the author is not heard about 1-bit math.
Therefore, converting DSD to DSD is starting from transformation to multi-bit DSD (in instance, for AuI ConverteR 64-bit float / double precision) with the same frequency as the original Direct Stream Digital audio. Multibit DSD may be considered as PCM with a useful band of about 0 ... 30 kHz.
The converter software performs mathematical operations in 64-bit float / double precision.
Alternatively, these operations may be applied in other precision: 32-bit, 32-bit float or other.
After all operations, the multi-bit signal is re-modulated back into 1-bit DSD.
Before the re-modulation, the processed signal should be filtered to avoid overloading (clipping and broken stability) of the DSD modulator.
DSD files are audio files that contain audio in DSD format. Read more...
DSF file is a DSD audio file format. Read details...
DSD files contain high-resolution audio. Read more...
DSD is a sound format, that SACD contains.
Look at where you can download DSD music files:
Technically, FLAC is PCM format. And, actually, we compare PCM and DSD. Read more...
Both formats have advantages and disadvantages....
play DSD (.dsf, .dff) files with foobar2000...
DSD over PCM (DoP) is a way to transmit audio data via standard audio interface (USB). Read details...
DSD to FLAC conversion has some losses. However, proper conversion causes very small ones.
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DSD converter software may contain:
- DSD demodulator,
- DSD modulator,
Playback hardware may have different distortions for different modes (sample rate, bit depth, PCM/DSD).
Resampling DSD or conversion PCM to DSD and DSD to PCM may give benefits, if the target format is suitable for DAC mode, which causes minimum distortions.
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Articles about sigma-delta modulation
- Arash Loloee. Understanding Delta-Sigma Modulators
- Principles of Sigma-Delta Modulation for Analog-to-Digital Converters
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- What is DSD audio >
- DSD vs PCM. Real competitors? >
- DSD Decoder Audio >
- How work sigma delta modulation in audio >
- What is Audio Formats DSD 2.8 DSD64 DSD5.6 DSD128 DSD256 DSD512 DSD1024 >
- DSD vs DSF vs DFF Files Audio. What is difference >
- How to convert CD to DSD files >
Audio Basis - articles about audio
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