DSD ; ASIO ; Native DSD

November 12, 2014 8:30 pm | Leave a Comment |

Ce stiu eu despre

DSD – link

ASIO – protocol software proprietar, dezvoltath Steinberg pt win XP pentru a “sari” peste detestatul KMIXER din XP (in primul rand la inregistrare pt low latency, in al doilea rand sa evite convesia automata a streamului PCM din 24 in 16 biti si rata de esantionare default pt volum), folosit la inceput de segmentul audio pro si mai apoi adoptat si de o mare parte a producatorilor de placi audio cu pretentii de calitate sursa Includerea streamului DSD in protocol a fost facuta in v2.2 sursa pg 48 ofera descrierea implementarii. In ciuda faptului ca DSD este single-bit cu ASIO se poate transmite in 3 feluri, in pachete de 8 biti per byte sau 1 bit per byte irosind restul de 7 biti, deci impachetat sa neimpachetat – pg 33 A pierdut din teren odata cu Vista si implementarea WASAPI si KS (kernel streaming).

Native DSD – eh, aici m-am impotmolit, nu am gasit o definitie unitara, ceea ce ma face sa cred ca e doar un tool de marketing.

  1. cei care vand muzica: “We strive to provide listeners with a top quality resource for the best quality DSD Stereo and Multichannel music directly from native DSD recorded music and Analog Master Tapes.” sursa Definitia este eronata deoarece nu exista mixer software pt DSD, toate mixerele pt DSD convertesc streamul DSD in PCM (cu super ultra mega rata de esantionare) iar apoi din nou in DSD pt distributie. Conversia DSD PCM si invers se face cu pierdere de informatie, datorita filtrelor folosite, daca aceaste pierderi sunt audibile e un subiect care este in dezbatere. Partea buna este ca exista si inregistrari DSD neprocesate, dar acestea sunt f rare.
  2. XMOS – Thesycon (firma acceptata de XMOS pt dezvoltarea/customizarea driverelor pt usb audio bazate pe chipuri xmos) face distinctie intre Native DSD si DSD over PCM (DoP), ce inteleg eu de aici e ca ei an intre driver si player un bitsream dsd, dar nu se spune nimic de partea de transmisie propriu zisa a datelor prin USB …. Mai ales ca DSD nu este cuprins in standardul USB2.0. Deci in cazul lor as spune ca nu playerul software face conversia in DoP ci driverul (din pacate aici nu am nimic care sa sustina afirmatia) sursa Mai mult datele sunt la randul lor transmise in pachete conform protocolului USB.
  3. producatorii DAC – sunt mai rezervati, ei spun despre device ca este DSD capable/ready sau altii, mai putini, ca suporta native DSD
  4. la un moment dat se folosea sintagma pentru play DSD fara conversie in PCM

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SACD files

November 10, 2014 11:48 am | Leave a Comment |

1. definitie format

2. containere – iso, dsf, dff si diferente

3. conversie

4. DoP – def, exemple

5. tools si exemple

Bufallo III based streamer

November 5, 2014 10:47 pm | Leave a Comment |

1. BBB + Volumio – Debian updated to Jessie, MPD git 0.19.2

2. I2SoverUSB

3. Bufallo III – stereo config

4. IVY Line stage

 

Power source

1. DAC – Placid HD

2. line stage – Placid HD bipolar

3. BBB – linear power supply 5V

 

Case

Cutie metalica

 

 

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volumio bbb – update

October 25, 2014 6:25 pm | Leave a Comment |

install latest volumio release

1. update to jessie

# cp /etc/apt/sources.list{,.bak}
# sed -i -e 's/ \(stable\|wheezy\)/ testing/ig' /etc/apt/sources.list
# apt-get update
# apt-get --download-only dist-upgrade
# apt-get dist-upgrade

2. update to latest kernel – am33x-v3.17 – best use a virtual machine to save time

http://www.eewiki.net/display/linuxonarm/BeagleBone+Black

3. compile mpd from git

http://mpd.wikia.com/wiki/Repositories

http://mpd.wikia.com/wiki/BuildingMPD

4. install missing libraries

apt-get install smbclient libnfs4 libicu52

5. rename old mpd and create symlink to the new one

6. change vim /lib/systemd/system/mpd.service with actual conf path

7. HWCLOCKACCESS=no

vim /etc/default/hwclock

8. monitor – disable?

9. set cpu frequency

cp /usr/share/doc/cpufrequtils/examples/cpufrequtils.sample /etc/default/cpufrequtils

governor performance

10. install i2c

apt-get install i2c-tools

apt-get install python-smbus

i2cdetect -r 2 – check device (48)

 

 

 

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ARM – pops dsd play solution

October 25, 2014 2:54 pm | Leave a Comment |

edit

/etc/sysctl.conf

and add to the end of the file

vm.min_free_kbytes=25000

verify

 sysctl -a | grep vm.min_free_kbytes

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The Quiet War series by Paul J. McAuley

May 21, 2014 3:23 pm | Leave a Comment |

Gen: space opera Multe idei noi, bine integrate in serie.

Overall 4

Dire Earth Cycle by Jason M. Hough

April 8, 2014 7:29 pm | Leave a Comment |

Prima carte a seriei. Bine scrisa, ritm bun, personaje diverse si bine construite.

A doua si a treia la fel de bine merg pe acelasi fir cu acelasi personaje.

Am fost sceptic cand am vazut ca este o carte cu zombies, dar autorul a reusit sa ii intergreze bine si sa dea un sfarsit fericit de soap opera.

http://en.wikipedia.org/wiki/The_Dire_Earth_Cycle

Overall: 3.5

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Cubox-i

March 27, 2014 9:18 am | Leave a Comment |

Dupa aproape 4 luni de asteptare a sosit

imagine

1. Set-up a mpd server – http://imx.solid-run.com/forums/viewtopic.php?f=8&t=787

a. To optimize the system, you can also replace NTPd with ntpdate. This one is said deprecated by ARchLinux but fully functionnal. It avoid continuous requests done by NTPd which are mosts of the time uneeded for an audio streamer. The main idea here is removing NTPd, installing ntpdate and using a cron job once a day to update the real time clock.

de scos din rc si pus in cron o data la 2 ore

systemctl disable ntpd

crontab -e

0 * * * *  /usr/sbin/ntpd -qg

2. [root@alarmcbi ~]# mount /media/music/
mount error: cifs filesystem not supported by the system
mount error(19): No such device
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

De vazut de ce nu merge cu cifs

3. Static IP Address – Optional – pt varianta finala

aici este “/usr/bin/ntpd -gq || true”

4. modify /etc/hostname

5. update mpd-conf

6. check alsa samplerate daca merge cu Sox

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Good recordings

March 19, 2014 10:05 am | Leave a Comment |

Diana Krall, live in paris. All of them really
Dave Matthews, any CLA mixed.
Norah Jones, Come Away.
All of the Donald Fagen stuff and this has the eztremes of the spectra, but Its all within range +-
Zac Brown. (The iast two)
Any of the Joe Lavano on Blue Note.
Early Dr. Dre stuff.

—————-

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Tube vs SS

March 7, 2014 5:31 pm | Leave a Comment |

Dintr-un review:

 

One reason audiophiles (and musicians) like
valve amplifiers is that they overload very
gracefully… so gracefully that it’s difficult to
perceive they’re overloaded at all. Whereas
solid-state amplifiers go straight into hard
clipping at which point they suddenly
generate (literally) hundreds of high-level
odd- and even-order harmonic distortion
components, valve amplifiers clip ‘softly’
and, when they do, generate only a few,
low-order harmonic distortion components,
many of which sound so pleasant to the ear
(being predominantly low-order and evenorder
harmonics) that it’s difficult (perhaps
impossible) to hear they’re overloading at
all. This ‘soft clipping’ effect also makes it
difficult to measure the exact output power
of valve amplifiers, because soft clipping
is also difficult to observe visually on an
oscilloscope screen, whereas hard clipping
is instantly visible.

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