Activity 1 - Digitising Sound For the following text insert the words underneath into the blank spaces. Q1. For the following text insert the words underneath into the blank spaces. digital signal microphone analogue analogue-to-digital converter Sound is an ____________ sound wave. To save this on a computer a ____________ converts it to an electrical analogue signal. An ____________ converts it to a ____________ which the computer can then save. [4] Q2. The quality of sound saved in an audio file is determined by both the bit rate and what? Q3. If the bit rate of a sound file is increased what happens to the audio quality? Highlight one box The bit rate has no effect It increases It decreases Challenge: Activity 2 - Impact of Bitrate and Sample Rate Answer the questions below about sound. 1. Explain how an increase in bitrate can increase the quality of a sound file. [3] 2. What is meant by the term ‘sample rate’ and what affect would an increase in sample rate have on a sound file? [3] Activity 3 - Calculating File Sizes Use the formula below to answer the To calculate the number of bits required to store a sound file you would need to do this: file size = (bit rate x sample rate x (minutes x 60)) E.g. A 4-bit sound file with a frequency of 100hz that is 2 minutes long would be calculated like this: 4 x 100 x (2 x 60) 48 000 bits or 6 000 bytes or 6 kilobytes Question: An audio CD has a bit-rate of 16 bits. It has a frequency (sample rate) of 44,100 Hz for each of the left and right speakers How many bits are required to store 1 second of audio for both speakers? How many bytes are required to store 1 minute of audio? A 650 MB CD can store how many minutes of audio? PLEASE IF YOU ANSWER THIS YOU WILL GET GOOD POINTS
Answers
Answer:
Explanation:
An analogue sound wave is picked up by a microphone and sent to an Analogue to Digital (ADC) converter in the form of analogue electrical signals. The ADC converts the electrical signals into digital values which can be stored on a computer.
Once in a digital format you can edit sounds with programs such as audacity.
To play digital audio you convert the sound from digital values into analogue electrical signals using the DAC, these signals are then passed to a speaker that vibrating the speaker cone, moving the air to create sound waves and analogue noise.
Answer:
Mary, Queen of Scots was a threat to Elizabeth's rule because she had two claims to the English throne: Elizabeth had converted England's official religion to Protestantism , leaving many Catholics disgruntled. Mary was a Catholic and many viewed her as their figurehead and a rightful replacement to the throne.After 19 years of imprisonment, Mary, Queen of Scots is beheaded at Fotheringhay Castle in England for her complicity in a plot to murder Queen Elizabeth I. In 1565, she married her English cousin Lord Darnley in order to reinforce her claim of succession to the English throne after Elizabeth's death.
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