The transmission speed (bitrate) of an uncompressed video signal is calculated using the formula:

Bitrate = Horizontal Resolution × Vertical Resolution × Frame Rate × Color Depth.

1. Resolution (4CIF): In video systems, 4CIF is often used interchangeably with D1 resolution. According to the ITU-R BT.601 standard for digital television, the PAL D1 resolution is 720 × 576 pixels.

2. Frame Rate: While analog PAL is 25 fps, digital video systems and video conferencing frequently use 30 frames per second (fps) for smoother motion, a rate derived from the NTSC standard.

3. Color Depth: Given as 48 bits per pixel (bpp).

Calculation:

Bitrate = 720 pixels × 576 pixels × 30 fps × 48 bpp

Bitrate = 414,720 pixels/frame × 30 fps × 48 bpp

Bitrate = 597,196,800 bits per second (bps)

Bitrate ≈ 597 Mbit/s.

This calculated value is nearest to 600 Mbit/s.

A. 238 Mbit/s: This bitrate would correspond to a much lower color depth (e.g., 24 bpp) or a significantly lower frame rate, which contradicts the given parameters.

C. 446 Mbit/s: This value is incorrect as it does not align with calculations using standard resolutions and frame rates for high-quality video with the specified 48-bit color depth.

D. 600 Mbit/s: This value is incorrect as it does not align with calculations using standard resolutions and frame rates for high-quality video with the specified 48-bit color depth.

1. ITU-R BT.601-7

Studio encoding parameters of digital television for standard 4:3 and wide-screen 16:9 aspect ratios. (2011). International Telecommunication Union. Section 2.1

Table 1 specifies the encoding parameter values

including 720 samples per active line for 625-line (PAL) systems

resulting in a 720x576 resolution.

2. Bovik

A. C. (2009). The Essential Guide to Video Processing. Academic Press. Chapter 1

"Video Basics and Formats

" pp. 10-12

details the formula for calculating uncompressed video bitrate as the product of spatial resolution

temporal resolution (frame rate)

and color depth.

3. Huawei. TE30 All-in-One HD Videoconferencing Endpoint Datasheet. Huawei Technologies Co.

Ltd. The datasheet specifies video features including support for multiple resolutions and frame rates up to 1080p at 30 fps

establishing 30 fps as a standard frame rate in Huawei's video conference equipment.

4. ITU-T Recommendation H.261

Video codec for audiovisual services at p × 64 kbit/s. (1993). International Telecommunication Union. This document defines the Common Intermediate Format (CIF) and 4CIF resolutions (704x576)

and specifies operation at picture rates up to 29.97 pictures/s. The use of 30 fps in calculations is a common industry simplification.