EN 50067 "Specification of the radio data system (RDS) for >> +VHF/FM sound broadcasting in the frequency range from 87,5 to 108,0 MHz"

>> + FM Transmitter Control Reference >> + >> + The FM Transmitter (FM_TX) class includes controls for common features of >> +FM transmissions capable devices. Currently this class include parameters for audio >> +compression, pilot tone generation, audio deviation limiter, RDS transmission and >> +tuning power features. >> + >> + >> + FM_TX Control IDs >> + >> + >> + >> + >> + >> + >> + >> + >> + >> + >> + ID >> + Type >> + Description >> + >> + >> + >> + >> + >> + V4L2_CID_FM_TX_CLASS >> + class >> + The FM_TX class >> +descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a >> +description of this control class. >> + >> + >> + V4L2_CID_RDS_ENABLED >> + boolean >> + >> + Enables or disables the RDS transmission feature. >> + >> + >> + V4L2_CID_RDS_PI >> + integer >> + >> + Sets the RDS Programme Identification field >> +for transmission. >> + >> + >> + V4L2_CID_RDS_PTY >> + integer >> + >> + Sets the RDS Programme Type field for transmission. >> +This coding of up to 31 pre-defined programme types. > > coding -> encodes Right. > >> + >> + >> + V4L2_CID_RDS_PS_NAME >> + string >> + >> + Sets the Programme Service name (PS_NAME) for transmission. >> +It is intended for static display on a receiver. It is the primary aid to listeners in programme service >> +identification and selection. The use of PS to transmit text other than a single eight character name is not permitted. >> + >> + >> + V4L2_CID_RDS_RADIO_TEXT >> + string >> + >> + Sets the Radio Text info for transmission. It is a textual description of >> +what is being broadcasted. If broadcaster wishes to transmit longer PS names, programme-related information or any other >> +text, then RadioText should be used. > > This is slightly ambiguous. I would suggest changing the ending to: > > "should be used in addition to V4L2_CID_RDS_PS_NAME." I see. I'll change this. > >> + >> + >> + V4L2_CID_AUDIO_LIMITER_ENABLED >> + boolean >> + >> + Enables or disables the audio deviation limiter feature. >> +The limiter is useful when trying to maximize the audio volume, minimize receiver-generated >> +distortion and prevent overmodulation. >> + >> + >> + >> + V4L2_CID_AUDIO_LIMITER_RELEASE_TIME >> + integer >> + >> + Sets the audio deviation limiter feature release time. >> +The unit, step and range are driver-specific. > > I thought the unit was useconds? Yeah. Changing. > >> + >> + >> + V4L2_CID_AUDIO_LIMITER_DEVIATION >> + integer >> + >> + Configures audio frequency deviation level in Hz. >> +The range and step are driver-specific. >> + >> + >> + V4L2_CID_AUDIO_COMPRESSION_ENABLED >> + boolean >> + >> + Enables or disables the audio compression feature. >> +This feature amplifies signals below the threshold by a fixed gain and compresses audio >> +signals above the threshold by the ratio of Threshold/(Gain + Threshold). >> + >> + >> + V4L2_CID_AUDIO_COMPRESSION_GAIN >> + integer >> + >> + Sets the gain for audio compression feature. It is >> +a dB value. The range and step are driver-specific. >> + >> + >> + V4L2_CID_AUDIO_COMPRESSION_THRESHOLD >> + integer >> + >> + Sets the threshold level for audio compression freature. >> +It is a dB value. The range and step are driver-specific. >> + >> + >> + V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME >> + integer >> + >> + Sets the attack time for audio compression feature. >> +It is a useconds value. The range and step are driver-specific. >> + >> + >> + V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME >> + integer >> + >> + Sets the release time for audio compression feature. >> +It is a useconds value. The range and step are driver-specific. >> + >> + >> + V4L2_CID_PILOT_TONE_ENABLED >> + boolean >> + >> + Enables or disables the pilot tone generation feature. >> + >> + >> + V4L2_CID_PILOT_TONE_DEVIATION >> + integer >> + >> + Configures pilot tone frequency deviation level. Unit is >> +in Hz. The range and step are driver-specific. >> + >> + >> + V4L2_CID_PILOT_TONE_FREQUENCY >> + integer >> + >> + Configures pilot tone frequency value. Unit is >> +in Hz. The range and step are driver-specific. >> + >> + >> + V4L2_CID_PREEMPHASIS >> + integer >> + >> + Configures the pre-emphasis value for broadcasting. >> +A pre-emphasis filter is applied to the broadcast to accentuate the high audio frequencies. >> +Depending on the region, a time constant of either 50 or 75 useconds is used. The enum v4l2_fm_tx_preemphasis >> +defines possible values for pre-emphasis. Here they are: >> + >> + >> + >> + >> + V4L2_FM_TX_PREEMPHASIS_DISABLED >> + No pre-emphasis is applied. >> + >> + >> + V4L2_FM_TX_PREEMPHASIS_50_uS >> + A pre-emphasis of 50 uS is used. >> + >> + >> + V4L2_FM_TX_PREEMPHASIS_75_uS >> + A pre-emphasis of 75 uS is used. >> + >> + >> + >> + >> + >> + >> + V4L2_CID_TUNE_POWER_LEVEL >> + integer >> + >> + Sets the output power level for signal transmission. >> +Unit is in dBuV. Range and step are driver-specific. >> + >> + >> + V4L2_CID_TUNE_ANTENNA_CAPACITOR >> + integer >> + >> + This selects the value of antenna tuning capacitor >> +manually or automatically if set to zero. Unit, range and step are driver-specific. >> + >> + >> + >> + >> +

>> + >> +For more details about RDS specification, refer to >> + document, from CENELEC. >> +