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Audio-gd R2R-1 FPGA PCM/DSD DAC – Done Right - Headphone …
https://headphone.guru/audio-gd-r2r-1-fpga-pcm-dsd-dac-done-right/
Audio-gd R2R-1 FPGA PCM/DSD DAC: To get to the nuts and bolts of the Audio-gd R2R-1 I’ll quote from the Underwood HiFi page directly: “The R1 is an R2R full discrete DAC that uses 8 groups fully discrete R-2R DA modules to combine into a real balanced push/pull decoder. it also uses 4 group fully discrete real balanced DSD native decoders.
Audio GD R-1 R2R FPGA PCM/DSD DAC, Like New with original ...
https://www.head-fi.org/classifieds/audio-gd-r-1-r2r-fpga-pcm-dsd-dac-like-new-with-original-accessories-and-packing.19851/
R2R-1 FPGA PCM/DSD DAC Simply one of the best DACs I have heard with a musicality, resolution, and soundstage I have not heard equaled in DACs costing three to four times as much. One of my favorite discoveries of the year, congrats Audio-gd for a much-deserved Product of the Year Award!-Gary Alan Barker In the new review in headfi.guru they say:
Playing Audio with Simple PCM PWM Converter on FPGA …
https://www.youtube.com/watch?v=PxQIcnWSiGw
Source code: https://github.com/KorotkiyEugene/digital_lab/blob/master/Lab5/hw/audio_pcm_pwm/audio_pcm_pwm.v
Lab 1: A Simple Audio Pipeline
http://csg.csail.mit.edu/6.375/6_375_2011_www/handouts/labs/lab1.pdf
PCM Convert from PCM Audio Hardware Pipeline FPGA (XUP v5) Input Host Machine (X86) Output Communication Channel Serial Figure 1: High-level Audio Pipeline Diagram Figure 2: Audio Pipeline Made of Blocks The box marked Hardware Audio Pipeline in gure 1 contains the digital signal processing hardware which will be our focus in this and following ...
Audio-GD | Underwood HiFi
https://www.underwoodhifi.com/products/audio-gd
Audio GD is a high end Chinese company that produces DAC's, preamps, headphone amps and other hi end 2 channel products. We were shocked at the price to performance these products offer. We will offer a 2 year warranty on our sales and service products we sell in our Georgia service facility. R2R-1 FPGA PCM/DSD DAC.
fpga4fun.com - PWM DAC 3 - One-bit DAC
https://www.fpga4fun.com/PWM_DAC_3.html
The first step is to decode the MP3. The decoded MP3 data is called "PCM" data. To keep things simple, we send the PCM data through the serial port of the PC to the FPGA. The maximum rate possible through the serial port is 115200 baud (i.e. about 11.5 KBytes per second), so the music has to be down-sampled to 11KHz 8 bits.
Understanding PDM Digital Audio - users.ece.utexas.edu
https://users.ece.utexas.edu/~bevans/courses/rtdsp/lectures/10_Data_Conversion/AP_Understanding_PDM_Digital_Audio.pdf
PCM Before we tackle PDM, let’s first review PCM, that is, conventional multi-bit digital audio. In PCM, the audio signal is represented as a series of samples, each a fixed number of bits long. Two factors determine the performance of the system: • Sampling rate. This determines the bandwidth of the system.
GitHub - eltortugo/audioxtreamer: ASIO driver, Usb Driver ...
https://github.com/eltortugo/audioxtreamer
AudioXtreamer. A simple multichannel USB/FPGA PCM audio interface: Initially started as a simple way to add usb connectivity to the Yamaha 01x firewire based digital mixer & control surface, this project attempts to provide a simple low latency ASIO interface to a usb connected fpga that handles the i2s I/O.
Hardware Implementation of ADPCM Encoder and Decoder …
http://psrcentre.org/images/extraimages/3.%20212183.pdf
For audio this type of encoding reduces the number of bits required per sample by about 25% compared to PCM. Adaptive DPCM is a variant of DPCM that varies the size of the quantization step, to allow further reduction of the required bandwidth for a given signal-to-noise ratio [3]. Short for Adaptive Differential Pulse Code Modulation, a
Implement a pulse-density modulator on an FPGA | Koheron
https://www.koheron.com/blog/2016/09/27/pulse-density-modulation
Pulse-density modulation (PDM) is an attractive alternative to pulse-width modulation (PWM) in applications where the PWM technique creates unwanted spikes in the signal spectrum. We present the implementation of a pulse-density modulator on an FPGA to control the current of a laser. We will use a Red Pitaya board which has 4 slow analog outputs.
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