Question

The band width of Audio signal is (A) \(20 \mathrm{HZ}\) (B) \(20 \mathrm{KHZ}\) (C) \(20 \mathrm{MHZ}\) (D) \(20 \mathrm{GHZ}\)

Short answer

The standard human hearing range is from 20 Hz to 20,000 Hz (20 kHz). Therefore, the bandwidth of an audio signal is (B) 20 KHz or \(20 \times 10^3 \textrm{Hz}\).

Step-by-step solution

Determine the frequency range of human hearing

To identify the correct bandwidth for the audio signal, it is necessary to first understand the standard human hearing range. It generally ranges from 20 Hz to 20,000 Hz (20 kHz). This knowledge narrows down the options for the correct answer to the given exercise.

Choose the correct option

Since human hearing ranges from 20 Hz to 20 kHz, the bandwidth of an audio signal falls in this range. So, given the options available, the correct answer is (B) 20 KHz, which we can write as: \(20 \times 10^3 \textrm{Hz}\).

Key concepts

Understanding the Human Hearing Range

Humans are capable of perceiving sound vibrations thanks to our intricate auditory system. The range of frequencies that the average human ear can detect is called the human hearing range. It is usually between 20 Hz and 20,000 Hz (or 20 kHz). This means the lowest pitch we can hear is at 20 Hz, and the highest is at 20,000 Hz. Sounds below 20 Hz are referred to as "infrasonic," whereas those above 20 kHz are labeled "ultrasonic."
As we age, our ability to hear higher frequencies often diminishes, but most sounds that are important for daily life, communication, and music fall squarely within this range. Thus, understanding human hearing capabilities is essential, especially when designing audio equipment or systems meant for human use.

Exploring the Frequency Range Concept

To decide the bandwidth of an audio signal, it is crucial to define the term "frequency range." The frequency range indicates the span of frequencies over which a device, like a speaker or audio system, can operate efficiently. For audio systems, this frequency range often aligns with the human hearing range (20 Hz to 20 kHz).

• Lower end (20 Hz): Often associated with bass or deep tones, these frequencies add depth and fullness to sound.
• Upper end (20 kHz): Linked with treble or high-pitched sounds, these frequencies contribute to clarity and detail.

By recognizing this frequency range, developers and engineers aim to create audio equipment that provides a full and rich listening experience, staying faithful to what we naturally hear.

All About Audio Frequencies

When discussing audio and sound, the term "audio frequencies" frequently appears. These are the specific frequencies within the spectrum that the human ear can detect. Audio frequencies encompass a wide range of sounds: from the gentle rumble of thunder to the high notes of a soprano singer.

The importance of audio frequencies lies in their role in music, communication, and sound design. Musical notes are confined within audio frequencies, making them easily distinguishable. Similarly, in communication, both digital and analog signals use a frequency spectrum to transmit voice and data.

In the context of audio production and sound engineering, different frequencies are carefully balanced to achieve the desired tonal quality. Boosting or cutting specific audio frequencies can alter how instruments, voices, or any sound is perceived. This fine-tuning ensures that audio systems produce clear, harmonious, and pleasant sound outputs, adhering to the frequencies we can actually perceive.