[alsa-devel] AndreaElectronics PureAudio USB-SA

rmfc rmfc at l2f.inesc-id.pt
Wed Jun 23 18:40:19 CEST 2010


Hello,
I'm looking for a sound card that can be used to speech recognition in 
noisy environments. The best device that I found so far is 
AndreaElectronics PureAudio USB-SA but unfortunately it isn't properly 
supported in Linux. The device is recognized as an USB Audio device 
(module used is snd_usb_audio) and I can record audio in Audacity. The 
problem is that none of advanced DSP features is enabled.
I tried then Asus Xonar U1 but the problem is the same, no configuration 
is done in devices, so they record audio without quality to be used in a 
speech recognizer (not enough energy, audio DC components when software 
gain is applied in Sound Preferences...).

Is there any way known way to configure a USB Audio device? If I have to 
implement some code, where should I start?
I send you output of  "lsusb" of AndreaElectronics USB-SA sound card.

------------------------------------------------------------
Bus 003 Device 002: ID 08a8:000c Andrea Electronics
Device Descriptor:
   bLength                18
   bDescriptorType         1
   bcdUSB               1.10
   bDeviceClass            0 (Defined at Interface level)
   bDeviceSubClass         0
   bDeviceProtocol         0
   bMaxPacketSize0        64
   idVendor           0x08a8 Andrea Electronics
   idProduct          0x000c
   bcdDevice            1.00
   iManufacturer           3 Andrea Electronics
   iProduct                1 Andrea PureAudio USB-SA
   iSerial                 0
   bNumConfigurations      1
   Configuration Descriptor:
     bLength                 9
     bDescriptorType         2
     wTotalLength          293
     bNumInterfaces          4
     bConfigurationValue     1
     iConfiguration          0
     bmAttributes         0x80
       (Bus Powered)
     MaxPower              500mA
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        0
       bAlternateSetting       0
       bNumEndpoints           0
       bInterfaceClass         1 Audio
       bInterfaceSubClass      1 Control Device
       bInterfaceProtocol      0
       iInterface              0
       AudioControl Interface Descriptor:
         bLength                10
         bDescriptorType        36
         bDescriptorSubtype      1 (HEADER)
         bcdADC               1.00
         wTotalLength          128
         bInCollection           2
         baInterfaceNr( 0)       1
         baInterfaceNr( 1)       2
       AudioControl Interface Descriptor:
         bLength                12
         bDescriptorType        36
         bDescriptorSubtype      2 (INPUT_TERMINAL)
         bTerminalID             1
         wTerminalType      0x0101 USB Streaming
         bAssocTerminal          0
         bNrChannels             2
         wChannelConfig     0x0003
           Left Front (L)
           Right Front (R)
         iChannelNames           0
         iTerminal               0
       AudioControl Interface Descriptor:
         bLength                12
         bDescriptorType        36
         bDescriptorSubtype      2 (INPUT_TERMINAL)
         bTerminalID             2
         wTerminalType      0x0201 Microphone
         bAssocTerminal          0
         bNrChannels             2
         wChannelConfig     0x0003
           Left Front (L)
           Right Front (R)
         iChannelNames           0
         iTerminal               0
       AudioControl Interface Descriptor:
         bLength                12
         bDescriptorType        36
         bDescriptorSubtype      2 (INPUT_TERMINAL)
         bTerminalID             3
         wTerminalType      0x0603 Line Connector
         bAssocTerminal          0
         bNrChannels             2
         wChannelConfig     0x0003
           Left Front (L)
           Right Front (R)
         iChannelNames           0
         iTerminal               0
       AudioControl Interface Descriptor:
         bLength                12
         bDescriptorType        36
         bDescriptorSubtype      2 (INPUT_TERMINAL)
         bTerminalID             4
         wTerminalType      0x0605 SPDIF interface
         bAssocTerminal          0
         bNrChannels             2
         wChannelConfig     0x0003
           Left Front (L)
           Right Front (R)
         iChannelNames           0
         iTerminal               0
       AudioControl Interface Descriptor:
         bLength                 9
         bDescriptorType        36
         bDescriptorSubtype      3 (OUTPUT_TERMINAL)
         bTerminalID             6
         wTerminalType      0x0301 Speaker
         bAssocTerminal          0
         bSourceID               9
         iTerminal               0
       AudioControl Interface Descriptor:
         bLength                 9
         bDescriptorType        36
         bDescriptorSubtype      3 (OUTPUT_TERMINAL)
         bTerminalID             7
         wTerminalType      0x0101 USB Streaming
         bAssocTerminal          0
         bSourceID               8
         iTerminal               0
       AudioControl Interface Descriptor:
         bLength                 9
         bDescriptorType        36
         bDescriptorSubtype      5 (SELECTOR_UNIT)
         bUnitID                 8
         bNrInPins               3
         baSource( 0)           10
         baSource( 1)           11
         baSource( 2)           12
         iSelector               0
       AudioControl Interface Descriptor:
         bLength                13
         bDescriptorType        36
         bDescriptorSubtype      6 (FEATURE_UNIT)
         bUnitID                 9
         bSourceID               1
         bControlSize            2
         bmaControls( 0)      0x01
         bmaControls( 0)      0x02
           Mute
           Loudness
         bmaControls( 1)      0x02
         bmaControls( 1)      0x00
           Volume
         bmaControls( 2)      0x02
         bmaControls( 2)      0x00
           Volume
         iFeature                0
       AudioControl Interface Descriptor:
         bLength                10
         bDescriptorType        36
         bDescriptorSubtype      6 (FEATURE_UNIT)
         bUnitID                10
         bSourceID               2
         bControlSize            1
         bmaControls( 0)      0x01
           Mute
         bmaControls( 1)      0x02
           Volume
         bmaControls( 2)      0x02
           Volume
         iFeature                0
       AudioControl Interface Descriptor:
         bLength                10
         bDescriptorType        36
         bDescriptorSubtype      6 (FEATURE_UNIT)
         bUnitID                11
         bSourceID               3
         bControlSize            1
         bmaControls( 0)      0x01
           Mute
         bmaControls( 1)      0x02
           Volume
         bmaControls( 2)      0x02
           Volume
         iFeature                0
       AudioControl Interface Descriptor:
         bLength                10
         bDescriptorType        36
         bDescriptorSubtype      6 (FEATURE_UNIT)
         bUnitID                12
         bSourceID               4
         bControlSize            1
         bmaControls( 0)      0x01
           Mute
         bmaControls( 1)      0x00
         bmaControls( 2)      0x00
         iFeature                0
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        1
       bAlternateSetting       0
       bNumEndpoints           0
       bInterfaceClass         1 Audio
       bInterfaceSubClass      2 Streaming
       bInterfaceProtocol      0
       iInterface              0
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        1
       bAlternateSetting       1
       bNumEndpoints           1
       bInterfaceClass         1 Audio
       bInterfaceSubClass      2 Streaming
       bInterfaceProtocol      0
       iInterface              0
       AudioStreaming Interface Descriptor:
         bLength                 7
         bDescriptorType        36
         bDescriptorSubtype      1 (AS_GENERAL)
         bTerminalLink           1
         bDelay                  1 frames
         wFormatTag              1 PCM
       AudioStreaming Interface Descriptor:
         bLength                20
         bDescriptorType        36
         bDescriptorSubtype      2 (FORMAT_TYPE)
         bFormatType             1 (FORMAT_TYPE_I)
         bNrChannels             2
         bSubframeSize           2
         bBitResolution         16
         bSamFreqType            4 Discrete
         tSamFreq[ 0]         8000
         tSamFreq[ 1]        16000
         tSamFreq[ 2]        44100
         tSamFreq[ 3]        48000
       Endpoint Descriptor:
         bLength                 9
         bDescriptorType         5
         bEndpointAddress     0x01  EP 1 OUT
         bmAttributes            9
           Transfer Type            Isochronous
           Synch Type               Adaptive
           Usage Type               Data
         wMaxPacketSize     0x00c8  1x 200 bytes
         bInterval               1
         bRefresh                0
         bSynchAddress           0
         AudioControl Endpoint Descriptor:
           bLength                 7
           bDescriptorType        37
           bDescriptorSubtype      1 (EP_GENERAL)
           bmAttributes         0x01
             Sampling Frequency
           bLockDelayUnits         1 Milliseconds
           wLockDelay              1 Milliseconds
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        2
       bAlternateSetting       0
       bNumEndpoints           0
       bInterfaceClass         1 Audio
       bInterfaceSubClass      2 Streaming
       bInterfaceProtocol      0
       iInterface              0
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        2
       bAlternateSetting       1
       bNumEndpoints           1
       bInterfaceClass         1 Audio
       bInterfaceSubClass      2 Streaming
       bInterfaceProtocol      0
       iInterface              0
       AudioStreaming Interface Descriptor:
         bLength                 7
         bDescriptorType        36
         bDescriptorSubtype      1 (AS_GENERAL)
         bTerminalLink           7
         bDelay                  1 frames
         wFormatTag              1 PCM
       AudioStreaming Interface Descriptor:
         bLength                20
         bDescriptorType        36
         bDescriptorSubtype      2 (FORMAT_TYPE)
         bFormatType             1 (FORMAT_TYPE_I)
         bNrChannels             2
         bSubframeSize           2
         bBitResolution         16
         bSamFreqType            4 Discrete
         tSamFreq[ 0]         8000
         tSamFreq[ 1]        16000
         tSamFreq[ 2]        44100
         tSamFreq[ 3]        48000
       Endpoint Descriptor:
         bLength                 9
         bDescriptorType         5
         bEndpointAddress     0x82  EP 2 IN
         bmAttributes            5
           Transfer Type            Isochronous
           Synch Type               Asynchronous
           Usage Type               Data
         wMaxPacketSize     0x00c8  1x 200 bytes
         bInterval               1
         bRefresh                0
         bSynchAddress           0
         AudioControl Endpoint Descriptor:
           bLength                 7
           bDescriptorType        37
           bDescriptorSubtype      1 (EP_GENERAL)
           bmAttributes         0x01
             Sampling Frequency
           bLockDelayUnits         0 Undefined
           wLockDelay              0 Undefined
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        3
       bAlternateSetting       0
       bNumEndpoints           1
       bInterfaceClass         3 Human Interface Device
       bInterfaceSubClass      0 No Subclass
       bInterfaceProtocol      0 None
       iInterface              0
         HID Device Descriptor:
           bLength                 9
           bDescriptorType        33
           bcdHID               1.00
           bCountryCode            0 Not supported
           bNumDescriptors         1
           bDescriptorType        34 Report
           wDescriptorLength      50
          Report Descriptors:
            ** UNAVAILABLE **
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x87  EP 7 IN
         bmAttributes            3
           Transfer Type            Interrupt
           Synch Type               None
           Usage Type               Data
         wMaxPacketSize     0x0010  1x 16 bytes
         bInterval               1
Device Status:     0x0000
   (Bus Powered)
------------------------------------------------------------


Thanks for any help that you can give me.
Renato



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