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From: Sid Boyce on 23 Jun 2010 22:40
On 23/06/10 18:49, James Courtier-Dutton wrote:
> On 22 June 2010 13:58, Sid Boyce<sboyce(a)blueyonder.co.uk> wrote:
>> I have an application using the on-board sound card mic which should send
>> it's data to the USB card for relay to a Sofweare Defined Radio as 2
>> quadrature signals digital (I/Q) for transmission.
>> On the receiving side it can take data from the Radio at up to 192K sample
>> rate --> program --> Speaker on the on-board sound card - that works fine.
>> Transmit fails, dmesg output with 48K sample rate set is:-
>> [509686.177169] ALSA sound/usb/clock.c:214: 6:2:3: endpoint lacks sample
>> rate attribute bit, cannot set.
>> [509686.187920] ALSA sound/usb/clock.c:214: 6:2:1: endpoint lacks sample
>> rate attribute bit, cannot set.
>> [509686.266905] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
>> [509686.330901] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
>> [509686.353775] ALSA sound/usb/clock.c:214: 6:2:7: endpoint lacks sample
>> rate attribute bit, cannot set.
>> [509686.394898] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
>> [509686.458886] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
>> [509686.522874] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
>> [509823.078594] ALSA sound/usb/clock.c:214: 6:2:3: endpoint lacks sample
>> rate attribute bit, cannot set.
>> [509823.091571] ALSA sound/usb/clock.c:214: 6:2:1: endpoint lacks sample
>> rate attribute bit, cannot set.
>> [509823.146811] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
>> [509823.202679] ALSA sound/usb/clock.c:214: 6:2:7: endpoint lacks sample
>> rate attribute bit, cannot set.
>> [509823.210807] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
>> [509823.274792] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
>> [509823.338782] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
>> [509823.402783] ALSA sound/usb/mixer.c:2051: status interrupt: c0 0e
>> Regards
>> Sid.
>> --
>
> This device uses a global clock rate according to the data sheets.
> So, record rate must equal playback rate.
>
sample_rate = 48000 # ADC hardware sample rate in
Hertz receive from the radio.
name_of_sound_capt = "hw:2" # E-MU 0404 USB audio as IQ
capture (Receive)
name_of_sound_play = "hw:0" # HDA Intel on-board to Speakers.
channel_i = 1 # Soundcard index of in-phase
channel: 0, 1, 2, ...
channel_q = 0 # Soundcard index of quadrature
channel: 0, 1, 2, ...

# TX I/Q Generation for Softrock
name_of_mic_play = "hw:2" # E-MU 0404 USB audio for IQ
output sent to the Radio for transmit (Mic --> program --> E-MU -->
transmitter).
mic_playback_rate = 48000
mic_play_chan_I = 1
mic_play_chan_Q = 0
microphone_name = "plughw:0" # HDA Intel on-board sound
mic_channel_I = 0 # Soundcard index of mic audio
channel
mic_channel_Q = 1 # Soundcard index of ignored channel
mic_sample_rate = 48000 # Microphone sample rate in Hertz
mic_max_sample = 25535
add_imd_button = 1

All sample rates set to 48K.
Regards
Sid.
--
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks

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