Rada pri koupi externi USB zvukovky

[Jaroslav Lukesh]

> Odesílatel: Petr Stetiar <ynezz na hysteria.sk>
> odesla mi interni zvukovka u laptopu. Musim si proto koupit novu, protoze
> bez hudby to nejde, tak bych Vas chtel poprosit o radu/doporuceni.
> 
> Co bych chtel:
> 
> - provedeni externi, pripojeni pres USB
> - cena do 4.000 ,- bez DPH
> - nemusi byt 5.1, staci stereo
> - na velikosti nezalezi
> - hlavne at s tim nejsou problemy pod linuxem!
>   (konstatovani, ze jede pouze na kernelech 2.6.0 bych nerad slysel :))
> - moznost zakoupeni v CR

Trosku zaprovokuji - a co takhle si ji udelat? Vsecky potrebne svaby na ni
se mi uz pul roku vali doma (proste neni cas), daji se sehnat mnohem
levneji nez ta zvukovka. Dokonce to ma i SP/DIF vstup a vystup. Nic se
nemusi programovat, proste se to jenom zapoji a jede. Mimochodem, pri
pouziti doporucovaneho zappojeni ty hodnoty jsou naprosto realne (taky tam
pouzivaji zesilovace asi tak drahe jako ten cip).

JL.

--------------------------------------------
PCM2902: With S/PDIF
On-Chip USB Interface:
? With Full-Speed Transceivers
? Fully Compliant With USB 1.1
Specification
? Certified by USB-IF
? Partially Programmable Descriptors(1)
? USB Adaptive Mode for Playback
? USB Asynchronous Mode for Record
? Bus Powered
16-Bit Delta Sigma ADC and DAC
Sampling Rate:
? DAC: 32, 44.1, 48 kHz
? ADC: 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz
On-Chip Clock Generator:
? With Single 12-MHz Clock Source
Single Power Supply: 5 V TYP (VBUS)
Stereo ADC Analog Performance at
VBUS = 5 V:
? THD+N = 0.01%
? SNR = 89 dB
? Dynamic Range = 89 dB
? Decimation Digital Filter
? Passband Ripple = ?0.05 dB
? Stopband Attenuation = ?65 dB
? Single-Ended Voltage Input
? Antialiasing Filter Included
? Digital LCF Included
Stereo DAC Analog Performance at
VBUS = 5 V:
? THD+N = 0.005%
? SNR = 96 dB
? Dynamic Range = 93 dB
? Oversampling Digital Filter
? Passband Ripple = ?0.1 dB
? Stopband Attenuation = ?43 dB
? Single-Ended Voltage Output
? Analog LPF Included
Multifunctions:
? HID Volume ? Control and Mute Control
? Suspend Flag

No a nebo jen o hodne lepsi DAC:

PCM2702
l INTEGRATED USB INTERFACE:
Full-Speed Transceiver Supports 12Mbps
Data Transfer.
Fully Compliant with the USB 1.0 Specification.
Adaptive Mode for Isochronous Transfer.
Self-Powered Device.
l ACCEPTS 16-BIT STEREO AND MONO
USB AUDIO DATA STREAMS.
l ANALOG PERFORMANCE (VCC = 5V):
Dynamic Range: 100dB (typ at 16-bit)
SNR: 105dB (typ)
THD+N: 0.002% (typ at 16-bit)
Full-Scale Output: 3.1Vp-p
l 8X OVERSAMPLING DIGITAL FILTER:
Passband: 0.454fS
Stopband: 0.546fS
Passband Ripple: ?0.002dB
Stopband Attenuation: ?82dB
l SAMPLING RATE (FS): 32kHz, 44.1kHz,
48kHz
l ON-CHIP CLOCK GENERATOR
WITH SINGLE 12MHz CLOCK SOURCE
l MULTI-FUNCTIONS:
Digital Attenuator: 0dB to ?64dB, 1dB/step
Soft Mute
Zero Flag
Suspend Flag
Playback Flag