The AD1970 is an analog or digital in, analog out TV Stereo Digital Audio Processor with programmable MTS (BTSC) encoder which includes pilot-tone generation and sub-carrier mixing functions. The stereo ADC provides the means for digitization of the analog baseband audio signal. A built-in high performance DAC is provided to output the BTSC base-band composite signal. The output of the AD1970 can be connected with minimal external circuitry to the input of a 4.5 MHz aural FM modulator.
In addition to the digital BTSC encoder, the AD1970 includes a stereo image enhancement function, Phat Stereo, to increase the sense of spaciousness available from closely spaced TV loudspeakers. A dialog enhancement algorithm solves the problem of playing wide dynamic range sources over limited-performance TV speakers and amplifiers. An I2C port allows control of the AD1970’s registers and parameters.
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|AD1970: Digital BTSC Encoder with Integrated ADC and DAC Data Sheet (Rev 0, 05/2005) (pdf, 443 kB)||Data Sheets|
Encoder's Spare Channel Embeds Whole-House Stereo Audio in Satellite Set-Top-Box Designs Stably and Cost-Effectively
by Jeritt Kent and Victor Chang, Analog Devices, Inc. (Analog Dialogue, Vol. 39, July 2005)
Audio Processors, Amplifiers Deliver Complete HDTV Audio Subsystem
ADI: Analog Essential To HDTV Experience
(Electronic Design, 10/1/2007)
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