The LA72910/12 devices are video modulator/demodulator circuits.
ASK modulation and demodulation (LA72912) Video signal FM modulation and demodulation Video signal emphasis and de-emphasis Video FM signal drop-out detection FM mute function at second-call Carrier frequency: 10.9 to 12.1MHz Power supply: +4.7V to +5.5Vdc Operating temperature range: -30 to +70°C