more discussion of #Bluetooth SBC-XQ #audio
on 02026-06-14SBC-XQ is a #Bluetooth hack to get better sound quality out of the SBC codec mandated by A2DP (Advanced Audio Distribution Profile, which I think is “high fidelity playback”) #audio
on 02026-06-14some old #audio #synth #electronics design #toread
on 02026-04-23#video #toread by #Coding-Adventure about analyzing #audio with #DSP
on 02026-01-13The #Nintendo Ricoh 2A03 #electronics #hardware had a “delta modulation channel” for #audio sound effects using an up/down counter.
on 02025-11-11notes on #WCET for #music #audio #real-time #responsivity in #SuperCollider
on 02024-02-06Craig E. McKown’s thesis on #LPC (but not LPC-10) #speech-synthesis or anyway #audio codecs for voice from 01984
on 02024-01-23more on #Audio playback and recording with PIC #hardware
on 02024-01-23#Audio playback and recording with a PIC or other small microcontroller #hardware from a 1-bit (?) bitstream, using the standard RC time constant model (but with the time constant scaled to be a factor of 2 instead of e) in different #algorithms. He scales the waveform down to half the maximum possible amplitude and then models the RC time constant with each possible bit, with the sample time set to a decay factor of ⅛ (which I guess is .133τ) to see which one gives a smaller error, and goes with that bit. He got acceptable response at 19.5ksps.
on 02024-01-23Atmel’s appnote on #audio playback on #AVR using SPI Flash #hardware
on 02024-01-23yeah, it’s not #AVR #speech-synthesis, it’s “#Audio encoded as unsigned 8-bit, 8kHz sampling rate,” 4.6K of it
on 02024-01-23#speech-synthesis on an ATtiny85 #AVR? or just #audio reproduction maybe with a piezo buzzer
on 02024-01-23#Nayuki’s #FLAC #audio #codec implementation in 200loc for the encoder and 300loc for the decoder, in Java and Python. #small-is-beautiful #DSP
on 02023-08-09discussion of Dominic Szablewski’s #qoa #audio #DSP #codec. He comments that it encodes 10× faster and decodes 7× faster than Opus. It also encodes 5.7× faster than ffmpeg mp3.
on 02023-08-09my calculations about Dominic Szablewski’s #qoa #audio #DSP #codec #performance: something like 400 32-bit integer instructions per sample
on 02023-08-09#Sean-Barrett’s public-domain single-file #Ogg Vorbis #audio #DSP decoder, reputed to be fast and easy to integrate. 5kloc.
on 02023-08-09The #ADPCM #audio #codec has problems in #Godot importer for the #WAV #file-format, but apparently it’s still reasonably popular.
on 02023-08-09Dominic Szablewski’s #audio #DSP #codec #file-format "qoa" for fast, lossy #compression: “[Quite OK Audio] is fast. It decodes audio 3x faster than Ogg-Vorbis, while offering better quality and compression (278 kbits/s for 44khz stereo) than ADPCM. QOA is simple. The reference en-/decoder fits in about 400 lines of C. The file format specification is a single page PDF.” This might be worthwhile for low-CPU-power audio recorders and maybe the Zorzpad, especially for games. Now supported systemwide in SerenityOS. Based on 4-tap linear prediction? With the weights varying over time?
on 02023-08-09how to use Timidity++ #free-software to render #MIDI #music as #audio
on 02020-12-13#music #audio #free-software #software under GPLv2 with score view and #MIDI
on 02020-12-13Julius Orion Smith's #ebook on physical audio signal processing has this section on simulating brass instrument #audio #music, referring to #STK for more details.
on 02020-12-13"STK" is the Synthesis Toolkit, for #DSP #audio #music synthesis and processing. It's #free-software, written in C++. #software
on 02020-12-13how to simulate brass instruments for physically based synthesis, from #STK. Looks like 16-32 math operations per sample. #DSP #audio #music
on 02020-12-13#audio #interview with William Byrd about #KANREN, with a transcript. Kind of insane that in 2013 he was still a postdoc; maybe he still is today?
on 02017-02-23#audio of #weev advocating #white-supremacist warfare with #drones on 2015-09-25 #weaponry #human-rights #USA #politics
on 02016-10-11#History of the early days of #JS, plus some stuff about Java and Strongtalk and Hotspot and Blackburn and whatnot, an #interview with Brendan Eich (transcript and #audio)
on 02016-06-30phased array passive sonar for #audio imaging, like what HASAS does for anti-submarine warfare; using MEMS microphones, it becomes affordable to feed a lot of microphones to a #FPGA #hardware at once for #DSP #beamforming. Like holy shit 65536 microphones. By Artem Litvinovich.
on 02016-06-29#audio #latency on #android has an extra 10ms
on 02015-11-25“algorithmic digital reverberators”, 1000 years of reverbs in #music. Sadly it’s just a PowerPoint talk with MP3 #audio.
on 02015-11-11The LMMS digital #audio workstation free-software project has a bunch of downloadable samples, including this grand-piano sample, under free licenses. Also thousands of LMMS “projects”, which I guess is like your entire LMMS workspace setup, categorized by musical genre. The samples are useful even if you don’t have LMMS.
on 02015-09-20Wikipedia used to have a “featured sounds” curation process that cataloged really awesome downloadable #cc #audio, including a lot of #music, but this process ended in 2011.
on 02015-08-13almost 150k #audio #recordings in over 10 TB totaling 7513 hours with sounds of 9000 species. Relatively easily downloadable #MP3 files. Attempts to restrict use with a “terms of use” statement.
on 02015-08-06#AVR #modem using short and long pulses for 12 kilobit per second #audio data transfer, avoiding heavy-duty #DSP.
on 02015-08-05