Upsampling audio to a higher sample rate increases the theoretical bandwidth, but the new frequency space is empty. A CD upsampled from 44.1 kHz to 176.4 kHz gains bandwidth from 22.05 kHz to 88.2 kHz — with nothing in it. Conventional hi-res processes leave that space vacant or fill it with random noise. Neither approach improves the sound.

HD Remaster fills that space with real content. It generates even-order harmonics from the source material, extending meaningful audio data up to the theoretical frequency limit. The result is audio that behaves like a true high-resolution recording — with natural high-frequency decay, richer detail, and greater depth.

The problem with conventional upsampling

Standard upsampling places new sample points on a mathematically predicted curve between existing samples. The waveform looks smoother at the higher sample rate, but it contains no new information. The sound is identical to the original.

Some processes go further and inject random noise into the ultrasonic range to fill the empty bandwidth. This is actively counterproductive — noise is not musical content, and it doesn't improve the listening experience.

How HD Remaster works

HD Remaster uses a proprietary even-order multiple-harmonics generator that produces harmonics from the source audio, filling the extended bandwidth with content that's musically related to the original signal. These aren't arbitrary frequencies — they're the natural overtones that would have been present in a higher-resolution recording of the same performance.

The generated harmonics produce a smooth, natural high-frequency decay in the extended range — the same spectral characteristic found in true hi-res recordings captured at high sample rates.

Dynamic Bit-Allocation

When bit depth increases from 16-bit to 24- or 32-bit, the additional lower bits need meaningful values. Conventional bit-depth expansion either leaves these bits at zero or fills them with dither noise.

HD Remaster's Dynamic Bit-Allocation uses the harmonic content to determine the precise value and placement of every sample point — both the original samples and the new ones created by upsampling. The waveform is reshaped based on real harmonic information, giving the additional bit depth genuine sonic value rather than padding.

Best paired with Harmony or Focus

For compressed sources like MP3 and AAC, HD Remaster delivers the best results when preceded by in-band harmonic restoration. Harmony or Focus regenerate harmonics lost during lossy compression, providing HD Remaster with richer source material to work with. The combined chain — in-band restoration followed by hi-res conversion — produces a substantially more natural result than upsampling compressed audio directly.

Where HD Remaster fits

HD Remaster operates in the time domain with minimal computational overhead, making it practical for any product with hi-res audio ambitions — including battery-powered portable devices. It works on all audio sources: CD, DVD, broadcast, streaming, and radio. Any device running HD Remaster can deliver audio that meets the characteristics of true high-resolution playback.