Ticket #2282 (closed defect: invalid)

Opened 10 years ago

Last modified 19 months ago

freerunner with gsmhandset-a7.state sends more quiet audio than nokia 6610i

Reported by: lindi Owned by: openmoko-kernel
Priority: normal Milestone:
Component: kernel Version:
Severity: normal Keywords: alsa call quality gsmhandset.state
Cc: Blocked By:
Blocking: Estimated Completion (week):
HasPatchForReview: yes PatchReviewResult:
Reproducible:

Description

I made a series of testcalls to objectively compare freerunner with gsmhandset-a7.state from http://docs.openmoko.org/trac/ticket/2121 to nokia 6610i. To me it seems that freerunner sends more quiet audio, maybe the default alsa state should be improved somehow?

Test setup:
1) laptop that plays test-message.flac using its internal speaker
2) mobile phone that is 5 cm away from the laptop. In this test the phone is either GTA02V5 with buzzfix or nokia 6610i.
3) linphone voip client connected to my VOIP provider
4) What I do is: call the phone with linphone and play audio from laptop to the phone so that linphone can record what gets sent to GSM network.
5) I did this test with both phones and in a quiet room and also in a room where a TV set provides extra background noise.

Results:
sox sample-3af07def.wav dummy.wav stat

Samples read:            314944
Length (seconds):     39.368000
Scaled by:         2147483647.0
Maximum amplitude:     0.207062
Minimum amplitude:    -0.191376
Midline amplitude:     0.007843
Mean    norm:          0.001523
Mean    amplitude:     0.000122
RMS     amplitude:     0.006678
Maximum delta:         0.328094
Minimum delta:         0.000000
Mean    delta:         0.001737
RMS     delta:         0.009205
Rough   frequency:         1754
Volume adjustment:        4.829

sox sample-61ca9657.wav dummy.wav stat

Samples read:            335755
Length (seconds):     41.969375
Scaled by:         2147483647.0
Maximum amplitude:     0.546875
Minimum amplitude:    -0.578186
Midline amplitude:    -0.015656
Mean    norm:          0.003382
Mean    amplitude:     0.000151
RMS     amplitude:     0.017334
Maximum delta:         0.960968
Minimum delta:         0.000000
Mean    delta:         0.004671
RMS     delta:         0.026990
Rough   frequency:         1982
Volume adjustment:        1.730

As you can see the maximum amplitude is
10*log(0.546 / 0.2070)/log(10) = 4.2 dB higher with nokia than with freerunner.

Attachments

sample-3af07def.flac (202.7 KB) - added by lindi 10 years ago.
call with freerunner in a quiet room
sample-61ca9657.flac (215.3 KB) - added by lindi 10 years ago.
call with nokia 6610i in a quiet room
sample-2a370f59c.flac (265.3 KB) - added by lindi 10 years ago.
call with freerunner in a room with moderate background noise
sample-18a1d1e63.flac (285.0 KB) - added by lindi 10 years ago.
call with nokia 6610i in a room with moderate background noise
test-message.flac (1.4 MB) - added by lindi 10 years ago.
original message that was played to the mobile phones for them to record and send it

Change History

Changed 10 years ago by lindi

call with freerunner in a quiet room

Changed 10 years ago by lindi

call with nokia 6610i in a quiet room

Changed 10 years ago by lindi

call with freerunner in a room with moderate background noise

Changed 10 years ago by lindi

call with nokia 6610i in a room with moderate background noise

Changed 10 years ago by lindi

original message that was played to the mobile phones for them to record and send it

comment:1 Changed 10 years ago by joerg

  • Status changed from new to closed
  • HasPatchForReview set
  • Version unspecified deleted
  • Resolution set to invalid

setting to invalid, haspatch
until tests are done with correct statefile and clearly show the issue of "other people can't hear me".
"4.2 dB higher" is near to HiFi? spec of +/-3dBm

comment:2 Changed 19 months ago by Larcadist

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