DeetCode.

Fixed-Point Multiply (Q15)

Medium C DSP
Solve this problem

Implement a fixed-point multiplication for Q15 format in C. Inputs are signed 16-bit, output also Q15. Prevent overflow and maintain saturation.

Constraints

  • Inputs int16_t.
  • Multiply produce 32-bit temp.
  • Shift right 15.
  • Clamp to [-32768, 32767].
  • Return int16_t.
Starter codeC
1#include <stdint.h>2int16_t q15_mul(int16_t a, int16_t b);