Display interfacing: A device that converts Binary-Coded Decimal (BCD) inputs into seven-segment display control signals is called what?

Introduction / Context:
Driving seven-segment numeric displays from digital systems commonly involves decoding BCD digits into segment control lines (a through g). Recognizing the correct functional block name is important for digital design and microcontroller interfacing.

Given Data / Assumptions:

• Input: a 4-bit Binary-Coded Decimal (0–9).
• Output: seven control lines to illuminate segments forming decimal numerals.
• Common variants include BCD-to-7-segment decoders/drivers (e.g., 7447, 4511).

Concept / Approach:
A decoder maps encoded inputs to one of many outputs or output patterns. Here, the encoded BCD input is decoded into a pattern that turns ON or OFF specific segments to display the corresponding numeral. An encoder does the opposite, generating a code from multiple active inputs, while a multiplexer selects one of many inputs to pass through—neither fits the required functionality.

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