Overview The LV1041M is a Dolby Prologic Surround signal-processing IC that implements in a single chip the functions of the Sanyo LV1016 and LA2786 ICs and a master volume control for the center and surround channels. This IC allows both systems of Dolby Prologic surround and digital surround to be formed into a single IC. Features • Implements a Prologic surround decoder in a single chip. • Wide dynamic range • All modes can be controlled from control data transmitted serially over four lines: CLOCK, DATA, ENABLE, and ENABLE2. This function is compatible with the LV1016 and the LA2786. Functions • Adaptive matrix • Center mode control (normal, phantom, wide) • 4/3 channel logic control • Auto-balance (on/off) • Prologic off mode (bypass and full bypass) • Center trim (0 to –31 dB in 1-dB steps) • On-chip memory: (8K SRAM) • Variable delay time: 15, 20, 25, 30, 40, or 50 ms (15, 20, 25, or 30 ms for Dolby Prologic surround) • New A/D and D/A converter circuits adopted • On-chip Dolby B noise reduction • On-chip input and output filters • Built-in VDD circuit • Surround trim (0 to –31 dB in 1-dB steps) • Input and output muting functions • Master volume control for the center and surround channels (0 to –44 dB in –2-dB steps, –44 to –76 dB in –4-dB steps, and muted)
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