On 20.07.2018 11:24, David Kastrup wrote:
Ralf Mardorf <ralf.mardorf@xxxxxxxxxxxxx> writes:
On Thu, 2018-07-19 at 22:44 +0200, David Kastrup wrote:
You are babbling. [snip]
A lot of people get setups like that to work without rtirq .
Hi,
the OP on Wed, 2018-07-18 at 21:28 +0200 wrote "64 buffer size at 48kHz
2 Periods/Buffer" and the OP on Thu, 2018-07-19 at 14:32 +0200 wrote
"Bus 003 Device 002: ID 08bb:29c2 Texas Instruments PCM2902C Audio CODEC".
I'm not aware that a lot of people got this to work at all.
I missed the PCM2902C bit. That chip is described in
http://www.ti.com/product/PCM2902C/technicaldocuments and is USB full
speed (namely USB1.1 speeds). It is described as
– USB Adaptive Mode for Playback
– USB Asynchronous Mode for Record
It sports something like 16bit/48kHz with 89dB SNR. That is both with
regard to attainable sound quality as well as USB bus behavior
completely lacklustre. I'd expect this kind of interface to be mostly
soldered to mainboards directly where one would not expect to be able to
change buses at all.
Or be part of some USB sound interface in the $10 price class.
So the idea to take this into low-latency realms with a view on realtime
effects seems a bit optimistic indeed. Actually out of place. Maybe
this isn't actually the interface we are dealing with but just something
hardwired to the motherboard and thus cropping up in the lsusb output?
It's actually a behringer mixer (now legacy model afaik)... all right I
will try a different card.
I bought the docking station which has 6 more USB ports (4 USB 3.0 and 2
USB 2.0)
however:
lsusb
Bus 002 Device 002: ID 8087:8000 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 004: ID 17ef:304f Lenovo
Bus 004 Device 003: ID 2109:0812 VIA Labs, Inc. VL812 Hub
Bus 004 Device 002: ID 2109:0812 VIA Labs, Inc. VL812 Hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 003: ID 8087:07dc Intel Corp.
Bus 003 Device 011: ID 046a:b090 Cherry GmbH
Bus 003 Device 030: ID 1686:0045 ZOOM Corporation H4 Digital Recorder
Bus 003 Device 028: ID 0fce:01e1 Sony Ericsson Mobile Communications AB
Bus 003 Device 010: ID 0424:2640 Standard Microsystems Corp. USB 2.0 Hub
Bus 003 Device 009: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
Bus 003 Device 006: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 003 Device 008: ID 17ef:304e Lenovo
Bus 003 Device 007: ID 08bb:29c2 Texas Instruments PCM2902C Audio CODEC
Bus 003 Device 004: ID 2109:2812 VIA Labs, Inc. VL812 Hub
Bus 003 Device 002: ID 2109:2812 VIA Labs, Inc. VL812 Hub
Bus 003 Device 005: ID 0bda:5719 Realtek Semiconductor Corp.
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
no matter where I plug in the devices I can't seem to find how to use
the Bus 4 USB 3.0. Could it be that it is only on the motherboard but
not actually available to the user?
m.
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