WAVERSA SYSTEMS INC.
A different approach to digital processing unique to Waversa and why:
Generally, upsampling uses an FIR filter (Finite Impulse Response, fixed-form impulse response filter). Interpolation (interpolation) is performed during the upsampling process to correct the sound quality. FIR Interpolation is a mathematical calculation that estimates and fills between digital points.
In the case of the Saber ES90x8 series, such FIR filters are basically built-in, and DAC manufacturers can easily perform upsampling. However, in the case of incorrectly made upsampling, the sound becomes thinner, and it is often proved that listening with the upsampling function turned off sounds better.
WaversaSystems uses a proprietary WAP instead of the basic FIR filter included in the DA chip. WAP is designed with a multi-stage structure including a number of proprietary FIR filters and IIR filters (Infinite Impulse Response Filter) and performs high-resolution upsampling. This high-resolution upsampled signal is processed through thousands of iterative calculations using state-of-the-art source estimation algorithms to reduce digital errors and create a waveform that is as identical as possible to the original analog signal. This is the role of WAP.
WAP (Waversa Audio Processor)
Hardware method with very low jitter rate and accurate timing
Proprietary solution from digital input to processor
Dual WAP captures all signals on the optimized route
Centralized clock management in the signal path
Technology to minimize Quantization Error
Processes huge information up to 32Bit 1.5MHz
Highest level signal restoration algorithm by applying medical technology
Very few DAC manufacturers have developed their own digital processors because the development of digital processors requires significant understanding and knowledge of digital signal systems and is difficult to develop alone, and most DAC manufacturers use DSPs built into the DAC chip or use off-the-shelf modules. However, some high-end DAC manufacturers, such as CHORD, DCS, and MSB, design digital processors independently with sound quality as the top priority.
The software processing method has elements that cause errors because the processing is sequential and complicated. On the other hand, in the hardware processing method, since signal processing is performed once at the same time, there is no room for jitter, and the timing of the audio signal is exactly the same.
WDAC3C also has a digital processor chip designed by WaversaSystems, designed inhouse.
WaversaSystems digital processors are processed in hardware, not software-based digital processing, so they are processed simultaneously in a simple, optimized path resulting in fewer errors, and the timing of the audio signal is handled more accurately.
Modular design vs. proprietary signal path system:
Most DAC manufacturers produce modularized DAC components individually arranged and combined allowing for ease of development and production with easy with off-the-shelf chips. As a result, only a few DAC manufacturers have their own signal systems, and DACs of those brands are priced at more than $ 10,000. WDAC3C is a signal path system specification originally developed by WaversaSystems. All signal processing has been optimized, including a proprietary USB input circuit, network renderer, digital processor and DAC, and is controlled and operated precisely by a clock system unified by a digital processor (WAP). This method has a lower error probability, higher stability, and ideal digital signal processing than the method of circuit design with commercially available modules.
Dual WAP captures all signals In order to dramatically increase processing speed and efficiently manage signal processing. The first WAP (P1) processes all input signals, and the second WAP (P2) receives signals processed by P1 on I2S and decodes signals with clocks according to sampling rates. In this way, by assigning a unique role to each digital processor, signal interference is minimized, more sophisticated clock management is performed, and sound quality benefits from accurate signals that do not compromise digital signal integrity. The heart of WAP lies in signal restoration. 32Bit 1.5 MHz, processing huge information
The WDAC3C does not use the FIR built into the general ES9038, but uses multiple stages of FIR with proprietary logic to perform high-resolution upsampling. Instead, the heart of the technology is included in WAP, and the newly developed WAP has greatly increased the amount of data that can be processed. This new WAP has succeeded its predecessor (24Bit / 368kHz) with 32Bit 1.5MHz data processing. In comparison,16Bit, 65,532 digital signal processes are performed, and in 32Bit, there are 4 billion digital signal processes, and the sophistication of signal processing is dramatically increased. This has made it possible to generate digital signals that are closer to analog, and the subsequent digital restoration technology has become more accurate.
To put it simply, the improved internal processing speed of 32Bit 1.5MHz is similar to upgrading from DVD quality to 4K quality. This dramatically increases the detail and dynamic range that can be expressed.
WAP sounds more natural as you step up WAP's signal restoration algorithm technology increases in sophistication as the numerical value of the calculation accuracy increases. This is managed by WAP Level. WDAC1 has one stage of WAP, WDAC2 has three stages, WDAC3 has five stages, and WDAC3C has nine stages. This WAP is a computation that is processed at the digital stage and can be upgraded by connecting devices.
WCORE and WRouter are WAP level 3, yet when connected to WDAC3C with WAP level 9, a synergistic effect results and the WAP level is measured at 15. The higher the WAP level, the more sophisticated the processing per unit time, and the better the sound image and detail. And the tone of the instruments is also flexible, natural and easy to hear.
In designing and developing a DAC, there are several components that affect sound quality. Several factors, such as the design of the input / output lines, the design of the internal algorithm of the digital processing chip, and the performance of the DA chip, the design of the power supply unit and the design of the analog output unit are directly related to the completeness of the DAC.
ES9038PRO is a flagship model consisting of 8 channels that features 32-bit processing and ESS patented 32-bit HyperStream DAC technology. The HyperStream architecture has excellent sound quality and very low intermodulation distortion characteristics and has superior audio characteristics compared to general competitors using the delta-sigma architecture.
Digital processing of WDAC3C:
The performance of the DAC chip is also very important for the DAC, but it is not the only one. If DA chip performance is important, all DACs with the same DA chip should sound the same. The choice of a DAC chip is important, but the consequences will depend entirely on how the DAC chip is used. The WDAC3C uses only the most basic functions by bypassing the ES9038PRO and achieves excellent sound quality through original and unique designs for both the input and output sections. Two of them are WAP and WMLET.
WDAC3C has introduced two unique technologies from WaversaSystems to make optimal use of the ES9038PRO with a 32-bit 8-channel DAC.
One is WAP, a source estimation algorithm that operates at 32Bit 1.5MHz. The other is the range separation technology (WMLET).
Range Separation Technology (WMLET):
Channel separation technology for sound range and (WMLET – Waversa Multi-Layer Energy Transfer)
Rather than using the commercially available ES9038PRO chip as it is, WDAC3C has an algorithm that passes the circuits of the input stage and the oversampling filter stage and instead uses the WAP chip to process each process individually.
It is then passed on to the ES9038PRO by another key technology, the range channel separation technology (WMLET). Range channel separation technology (WMLET-Waversa Multi-Layer Energy Transfer) As the name implies, the band is divided into high, mid-high, mid-low, and low bands at the digital stage for each of the left and right channels, and passed through eight channels of ES9038Pro for processing. In conventional signal processing, the energy is concentrated in the middle band due to the characteristics of the analog element. Instead of 8 channels, only the left and right channels will be processed together, and more energy will be concentrated in the mid-band. To prevent this, WDAC3C distributes the energy evenly for each band and improves the sound quality. The advantage of separating the channels for each range using WMLET is that the WDAC3C has an ingenious technology that regulates energy in four channels per frequency band, thus improving distortion caused by energy bias and reviving subtle musical elements, a band balance that cannot be felt with conventional DACs has been realized. This approach to digital processing is unique only to Waversa products.
The energy concentrated in the mid band is evenly distributed, and the band balance is excellent.
The resolution increases with each band, taking advantage of the nuances of band separation and natural music.
Implementation of a wider music signal dynamic range and broadband frequency reproduction.
Natural balance of the sound can be maintained, and the originality of the tone is maintained.
Everything is designed and manufactured in-house:
Product Design, Hardware Design, Mechanical Drawing, Software Design, 3D Modeling and even including Remote Update Service.
WAP(Waversa Audio Processor) Information Protocol
Waversa Systems developed high-end audio processing technology for estimate original analog signal from digitized audio samples.
Higher grade WAP processing level provide well made analog system sound with Red Book input audio standard.
WNDR(Waversa Network Direct Render) Audio Protocol
Automatically discover and connect Waversa devices each other in the network and transmit and receive audio with low latency.
Lower latency characteristics of WNDR achieve low noisy environment for audio streamming.
Linux System Customization
Waversa Systems provide Linux customization for optimal high-end audio environment.
Custom USB 2.0 Audio Function Stack
Implement ultra low power USB 2.0 Audio stack to achieve low noise effect to high-end audio system which support unlimited sample rate.
Audio stream transmitted to audio processor/DAC without software intervention with ultra low power consumtion and guarentee high-speed async streamming.
Pure SPDIF Information Protocol
Implement custom ultra low jitter SPDIF receiver/transmitter IP suitable for high-end audio system.
Generate perfectly synchronized SPDIF signal with main audio reference clocks.
Analog Compensation Biquad IIR filter IP
Implement custom high reolution 32bit Biquad IIR filter for digitally compensate non-linearity of analog amplifier.
Multi-band Energy Transfer IP
Transfer Multi-band Energy separately to output IV stage using multiple DA convertors.
Extreme sound stage balance achieved by this unique technology.
Smart Battery Management Architecture
Smart Battery management for audio interface to prevent noise influences.
WSmartHub, WCORE, WROUTER was built mainly based on the "Smart Battery Management Architecure".