Lines Matching +full:audio +full:- +full:gain +full:- +full:db

1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
3 .. _fm-tx-controls:
11 parameters for audio compression, pilot tone generation, audio deviation
15 .. _fm-tx-control-id:
27     step are driver-specific.
34     to 31 pre-defined programme types.
52     programme-related information or any other text. In these cases,
65     then the audio was recorded as stereo.
70     bit of the Decoder Identification code. If set, then the audio was
75     then the audio is compressed.
101     Enables or disables the audio deviation limiter feature. The limiter
102     is useful when trying to maximize the audio volume, minimize
103     receiver-generated distortion and prevent overmodulation.
106     Sets the audio deviation limiter feature release time. Unit is in
107     useconds. Step and range are driver-specific.
110     Configures audio frequency deviation level in Hz. The range and step
111     are driver-specific.
114     Enables or disables the audio compression feature. This feature
115     amplifies signals below the threshold by a fixed gain and compresses
116     audio signals above the threshold by the ratio of Threshold/(Gain +
120     Sets the gain for audio compression feature. It is a dB value. The
121     range and step are driver-specific.
124     Sets the threshold level for audio compression freature. It is a dB
125     value. The range and step are driver-specific.
128     Sets the attack time for audio compression feature. It is a useconds
129     value. The range and step are driver-specific.
132     Sets the release time for audio compression feature. It is a
133     useconds value. The range and step are driver-specific.
140     range and step are driver-specific.
144     step are driver-specific.
149 enum v4l2_preemphasis -
150     Configures the pre-emphasis value for broadcasting. A pre-emphasis
151     filter is applied to the broadcast to accentuate the high audio
154     values for pre-emphasis. Here they are:
158 .. flat-table::
159     :header-rows:  0
160     :stub-columns: 0
162     * - ``V4L2_PREEMPHASIS_DISABLED``
163       - No pre-emphasis is applied.
164     * - ``V4L2_PREEMPHASIS_50_uS``
165       - A pre-emphasis of 50 uS is used.
166     * - ``V4L2_PREEMPHASIS_75_uS``
167       - A pre-emphasis of 75 uS is used.
173     dBuV. Range and step are driver-specific.
178     driver-specific.