[AudioI] problems with audioinjector octo boise.

Sat May 13 20:06:48 UTC 2023

Hi,
I own two audioinjector octo-s.
In 2022,.*some months ago *I tested the signal to noise ratio  and  ground
noise
for empty, not attached devices I got the expected results better than -90dB
Now, in May 2023- best Imy results *are widely worse about  -*55dB !!!
It looks that I do no more  use the full resolution of  24 bits.

On *diyAudio* it  shows up to -95 dB
https://www.diyaudio.com/community/threads/introducing-the-audio-injector.302508/post-5065706

REMARK: I use KDE5 plasma with Pulseaudio., same as in 2022
*QUESTION*: Are there known  problems with the 6.x.y kernels or has anybody
an  idea?
the last kernel was somethng around 5.1x.y

I* now use  kernel 6.2.1 (64bits)*
$uname -a
Linux pi4-injector-0 6.1.21-v8+ #1642 SMP PREEMPT Mon Apr  3 17:24:16 BST
2023 aarch64 GNU/Linux
TWO FINDINGS:
A)
Recording audio via Audacity I get obvious crappy signals (see attachments.)
the input  signal should be that large and somehow wit digital steps?

Using  gnuradio to calculate a  FFT-analysed  spectrum I get distortion
and noise between frequencies below  22kHz above the distortion strangely
is reduced .
I tried sampling at 48kHz, 96kHz and even the highest 192kHz.
Same results for all of Rates.!!!
stangel: Ouside the 22kHz bandwidth, the signal /nose is almost as
expected.
The card seems to be detected properly.

I  attached the *audacity-recordin*g, the *gnuradio spectrum *and
 the  result of *alsa-info*. and my */boot/config.txt*
Anybody any Idea?

$play -l
**** List of PLAYBACK Hardware Devices ****
card 0: vc4hdmi0 [vc4-hdmi-0], device 0: MAI PCM i2s-hifi-0 [MAI PCM
i2s-hifi-0]
 Subdevices: 1/1
 Subdevice #0: subdevice #0
card 1: vc4hdmi1 [vc4-hdmi-1], device 0: MAI PCM i2s-hifi-0 [MAI PCM
i2s-hifi-0]
 Subdevices: 1/1
 Subdevice #0: subdevice #0
card 2: audioinjectoroc [audioinjector-octo-soundcard], device 0:
AudioInject-HIFI cs42448-0 [AudioInject-HIFI cs42448-0]
 Subdevices: 1/1
 Subdevice #0: subdevice #0

----------------- here is my /etc/asound.conf

pcm.octo {
    type route
    slave{
     type lfloat             # Linear<->Float conversion PCM
        slave {                 # Slave definition
            pcm "plughw:CARD=audioinjectoroc"
            format s24le
        }

        channels 8
    }
    ttable {
           0.0 1
           1.1 1
           2.2 1
           3.3 1
           4.4 1
           5.5 1
           6.6 1
           7.7 1
    }
    hint {
        show {
           @func refer
           name defaults.namehint.extended
        }
        description "AudioInjector Octo Card (upto 6 channels input, upto 8
channels output)"
    }
}

ctl.octo {
    type hw
    card "audioinjectoroc"
}
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# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details

# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16

# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720

# uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug=1

# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4

# uncomment for composite PAL
#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800

# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on

# Uncomment this to enable infrared communication.
#dtoverlay=gpio-ir,gpio_pin=17
#dtoverlay=gpio-ir-tx,gpio_pin=18

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)
#dtparam=audio=on
#install AudioInjector-OCTO
dtoverlay=audioinjector-addons

# Automatically load overlays for detected cameras
camera_auto_detect=1

# Automatically load overlays for detected DSI displays
display_auto_detect=1

# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2

# Run in 64-bit mode
arm_64bit=1

# Disable compensation for displays with overscan
disable_overscan=1

[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
otg_mode=1

[all]

[pi4]
# Run as fast as firmware / board allows
arm_boost=1

[all]
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