Of a sigma-delta ADC directly to the one-bit back end of a DAC, bypassing the decimation and Experiments were made by connecting the 64fs one-bit product of the front end The low sample rate meant that brick-wall filters were needed, with theirĪttendant time-domain dispersion problems.Īlthough the idea of transacting and storing pulse-density-modulation (PDM) signals (like DSD)ĭirectly, without down-conversion to PCM ('decimation') was not new, it had not been used for audio Non-ideal behavior in terms of flatness and stop-band attenuation - as well as being confined to PCM ('64fs') their digital decimation and interpolation filters were real-estate-limited and so had very Quantisers in the converter chips of the day were one-bit and ran at 64x the eventual PCM rate Prism Sound Chief Technology Officer Ian Dennis takes us through it!ĭSD was conceived in an age when monolithic sigma-delta converters were relatively new. Note that as with the 44100Hz rates, only the lower rate is available on the S/PDIF interface (also as DSD over PCM).Īs there are many myths and legends surrounding the DSD format we felt it worth providing some explanation for those that might be interested, both about the format itself and about our implementation of DSD support in CALLIA, designed to provide the absolute best, no compromise transcription to the analogue domain. On the subject of formats: In addition to the 'standard' DSD bit rates that are multiples of 44100 Hz, we have implemented support for the slightly unusual DSD bit rates that are multiples of 48000 - namely 6.144Mbit/s (48000 equivalent to DSD64) and 12.288Mbit/s (48000 equivalent to DSD128). The technology has maintained a devout following and hence its inclusion in the range of formats supported by CALLIA. DSD data was formerly only available on SACD discs, but more recently has been made available in computer readable files. Link to Prism Sound Logging and Transcription siteĭSD is the format of the audio data used on SONY's Super Audio Compact Disc (SACD) format. Link to Prism Sound Test and Measurement site Link to Prism Sound Recording and Production site
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