/proc/asound/card?/stream?

I do not know (and forget) many things.

% arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: MID [HDA Intel MID], device 0: ALC889 Analog [ALC889 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: MID [HDA Intel MID], device 2: ALC889 Alt Analog [ALC889 Alt Analog]
  Subdevices: 2/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
card 2: CODEC [USB Audio CODEC], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

O.K. Now my device (IC-7410) is hw:2,0. (It depends on the sequence you power on your devices.)

% sprigmm /dev/ttyUSB1 hw:2,0 16000 1 hw:0,0 48000 2 <- note the bitrate

Run my program with the bitrate of hw:2,0 to be 16000bps.

% cat /proc/asound/card2/stream0
Burr-Brown from TI USB Audio CODEC at usb-0000:00:1a.0-1.3.1, full speed : USB Audio

Playback:
  Status: Stop
  Interface 1
    Altset 1
    Format: S16_LE
    Channels: 2
    Endpoint: 2 OUT (ADAPTIVE)
    Rates: 32000, 44100, 48000
  Interface 1
    Altset 2
    Format: S16_LE
    Channels: 1
    Endpoint: 2 OUT (ADAPTIVE)
    Rates: 32000, 44100, 48000
  Interface 1
    Altset 3
    Format: S8
    Channels: 2
    Endpoint: 2 OUT (ADAPTIVE)
    Rates: 32000, 44100, 48000
  Interface 1
    Altset 4
    Format: S8
    Channels: 1
    Endpoint: 2 OUT (ADAPTIVE)
    Rates: 32000, 44100, 48000
  Interface 1
    Altset 5
    Format: U8
    Channels: 2
    Endpoint: 2 OUT (ADAPTIVE)
    Rates: 32000, 44100, 48000
  Interface 1
    Altset 6
    Format: U8
    Channels: 1
    Endpoint: 2 OUT (ADAPTIVE)
    Rates: 32000, 44100, 48000

Capture:
  Status: Running <- ### this is it! ###
    Interface = 2
    Altset = 10
    Packet Size = 34
    Momentary freq = 16000 Hz (0x10.0000)
  Interface 2
    Altset 1
    Format: S16_LE
    Channels: 2
    Endpoint: 4 IN (ASYNC)
    Rates: 48000
  Interface 2
    Altset 2
    Format: S16_LE
    Channels: 1
    Endpoint: 4 IN (ASYNC)
    Rates: 48000
  Interface 2
    Altset 3
    Format: S16_LE
    Channels: 2
    Endpoint: 4 IN (ASYNC)
    Rates: 44100
  Interface 2
    Altset 4
    Format: S16_LE
    Channels: 1
    Endpoint: 4 IN (ASYNC)
    Rates: 44100
  Interface 2
    Altset 5
    Format: S16_LE
    Channels: 2
    Endpoint: 4 IN (ASYNC)
    Rates: 32000
  Interface 2
    Altset 6
    Format: S16_LE
    Channels: 1
    Endpoint: 4 IN (ASYNC)
    Rates: 32000
  Interface 2
    Altset 7
    Format: S16_LE
    Channels: 2
    Endpoint: 4 IN (ASYNC)
    Rates: 22050
  Interface 2
    Altset 8
    Format: S16_LE
    Channels: 1
    Endpoint: 4 IN (ASYNC)
    Rates: 22050
  Interface 2
    Altset 9
    Format: S16_LE
    Channels: 2
    Endpoint: 4 IN (ASYNC)
    Rates: 16000
  Interface 2
    Altset 10
    Format: S16_LE
    Channels: 1
    Endpoint: 4 IN (ASYNC)
    Rates: 16000
  Interface 2
    Altset 11
    Format: S8
    Channels: 2
    Endpoint: 4 IN (ASYNC)
    Rates: 16000
  Interface 2
    Altset 12
    Format: S8
    Channels: 1
    Endpoint: 4 IN (ASYNC)
    Rates: 16000
  Interface 2
    Altset 13
    Format: S8
    Channels: 2
    Endpoint: 4 IN (ASYNC)
    Rates: 8000
  Interface 2
    Altset 14
    Format: S8
    Channels: 1
    Endpoint: 4 IN (ASYNC)
    Rates: 8000
  Interface 2
    Altset 15
    Format: S16_LE
    Channels: 2
    Endpoint: 4 IN (SYNC)
    Rates: 11025
  Interface 2
    Altset 16
    Format: S16_LE
    Channels: 1
    Endpoint: 4 IN (SYNC)
    Rates: 11025
  Interface 2
    Altset 17
    Format: S8
    Channels: 2
    Endpoint: 4 IN (SYNC)
    Rates: 11025
  Interface 2
    Altset 18
    Format: S8
    Channels: 1
    Endpoint: 4 IN (SYNC)
    Rates: 11025

http://alsa.opensrc.org/Proc_asound_documentation

See the first several lines after the “Capture:” line.