This study explores the fundamental DSP techniques and their diverse applications across multimedia systems. Digital Signal Processing (DSP) has emerged as a transformative technology in multimedia applications, offering powerful techniques to enhance audio, image, and video processing. DSP begins with the conversion of analog signals into digital form through sampling and quantization, enabling precise manipulation and analysis using mathematical algorithms. Techniques like Fourier Transform, Discrete Fourier Transform (DFT), and Fast Fourier Transform (FFT) are foundational for frequency domain analysis, crucial for tasks such as audio compression, image enhancement, and video encoding. DSP algorithms optimize signal quality by reducing noise, enhancing clarity, and enabling efficient data transmission in multimedia streaming and communication systems. In audio signal processing, DSP techniques like perceptual coding and psychoacoustic modeling are employed for compression standards like MP3 and AAC, delivering high-quality audio with reduced file sizes. Noise reduction algorithms enhance speech intelligibility by removing background noise, while equalization and audio effects algorithms adjust frequency responses and simulate acoustic environments for immersive multimedia experiences. Image signal processing utilizes DSP filters and transforms to enhance image quality through techniques like histogram equalization, edge detection, and color correction. Image compression standards such as JPEG and JPEG2000 employ DCT and wavelet transforms to achieve high compression ratios without significant loss of visual fidelity. Video signal processing relies on DSP for motion estimation, video compression (e.g., H.264/AVC, HEVC), and real-time video enhancement techniques. These algorithms enable efficient data encoding, motion compensation, and noise reduction, essential for high-definition multimedia playback and streaming applications. As DSP continues to evolve with advancements in hardware acceleration and machine learning integration, its role in multimedia systems will expand, driving innovations in virtual reality, augmented reality, and interactive multimedia communication. This study highlights DSP's critical contributions to advancing multimedia technologies and its potential to shape the future of digital entertainment and communication platforms.