[Audacity-users] voice-activated sound and missing initial sounds, and record volume

[carrt7 .]

(Macbook Pro, OS 10.12.13, built-in mic and LS, Audacity 2.1.2)

When I set Preferences > SoundActivatedRecording on, level -50, everything
works but the recording misses a fraction of the first syllable spoken
after a pause. I presume this reflects the time taken for the SAS to
restart the recording.

Will adjusting the Latency or Latency Correction settings make any
difference?

Also, when I dictate into the MacBook in normal speaking voice, the
recording is way too quiet. Even when I turn the microphone volume slider
to max, and in Apple > SystemPreferences > InternalSpeakers set the volume
slider to max, the display (Waveform) only peaks at around 0.2.

On the Windows version I can set "microphone boost" to overcome this. But
not on the MacBook?

Tony

[Gale Andrews]

Post by carrt7 .
(Macbook Pro, OS 10.12.13, built-in mic and LS, Audacity 2.1.2)

Did you mean 10.12.3?

Post by carrt7 .
When I set Preferences > SoundActivatedRecording on, level -50, everything
works but the recording misses a fraction of the first syllable spoken after
a pause. I presume this reflects the time taken for the SAS to restart the
recording.
Will adjusting the Latency or Latency Correction settings make any
difference?

Possibly Audio to buffer might. Latency correction will not.

Really we need a "pre-roll duration" setting for Sound Activated Recording
to solve this.

Post by carrt7 .
Also, when I dictate into the MacBook in normal speaking voice, the
recording is way too quiet. Even when I turn the microphone volume slider
to max, and in Apple > SystemPreferences > InternalSpeakers set the volume
slider to max, the display (Waveform) only peaks at around 0.2.

"Internal Speakers" is an output setting I would guess, not an input setting.

Look in System Preferences > Sound, Input tab for whatever microphone
you are using.


Gale

Post by carrt7 .
On the Windows version I can set "microphone boost" to overcome this. But
not on the MacBook?
Tony
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[Roger]

Post by Gale Andrews

Post by carrt7 .
(Macbook Pro, OS 10.12.13, built-in mic and LS, Audacity 2.1.2)

Did you mean 10.12.3?

Post by carrt7 .
When I set Preferences > SoundActivatedRecording on, level -50, everything
works but the recording misses a fraction of the first syllable spoken after
a pause. I presume this reflects the time taken for the SAS to restart the
recording.
Will adjusting the Latency or Latency Correction settings make any
difference?

Possibly Audio to buffer might. Latency correction will not.
Really we need a "pre-roll duration" setting for Sound Activated Recording
to solve this.

To help others understand or to further define this, this means when voice
activation is utilized or enabled, the recording or audio application will
always be recording all of the time, preferably keeping about 1-5 seconds of
audio in a buffer. Upon voice detection, the audio application will take the
last 1-5 seconds of audio heard from the microphone, and append that 1-5
seconds of preserved (or pre-buffered) stream to the beginning of the voice
detected audio stream, hence preventing any initially clipped audio you are
currently expereincing.

This is one of those new oblivious settings for portable recording devices, not
readily or easily understood.

A good example of this function in use, the old motion detection video
recording devices only recorded the thief in the room after he broke through
the door. With this pre-buffered data function, the thief is now recorded
breaking through the door.

The downside to this function, latency can be significantly effected, causing a
slight delay (depending upon hardware abilities) before playback of audio in
addition to network latency.