4. A digital audio broadcast service is used to transmit digital music. Stereo audio signals are to be transmitted using a digital modem over a data link. A stereo signal uses two channels. In each channel, an audio signal is sampled at a rate of 44 kilo samples/second and quantised using a 24-bit quantiser. The data link has a transmission bandwidth of 0.5 MHz. Assume a 46-byte overhead is added to each packet before transmission. a. What is the total bit rate produced by a stereo audio signal? b. What is the minimum SNR value (in dB) required for the above data link? c. Assume that the broadcast service uses the UDP/IP/Ethernet protocol to transmit digital audio, using a packet switched network. The maximum packet size is limited to 800 bytes, which includes the combined packet header: UDP header (8 bytes), IP header (20 bytes), and Ethernet header (18 bytes). Calculate the number of packets required to transmit a 500 ms digital audio segment.
Unless specified otherwise, use the free space propagation speed of light 3x108 m/s to calculate the propagation delay. For numerical calculations, the results must show the appropriate unit. Show a complete solution for each problem
4. A digital audio broadcast service is used to transmit digital music. Stereo audio signals are to be transmitted using a digital modem over a data link. A stereo signal uses two channels. In each channel, an audio signal is sampled at a rate of 44 kilo samples/second and quantised using a 24-bit quantiser. The data link has a transmission bandwidth of 0.5 MHz. Assume a 46-byte overhead is added to each packet before transmission.
a. What is the total bit rate produced by a stereo audio signal?
b. What is the minimum SNR value (in dB) required for the above data link?
c. Assume that the broadcast service uses the UDP/IP/Ethernet protocol to transmit digital audio, using a packet switched network. The maximum packet size is limited to 800 bytes, which includes the combined packet header: UDP header (8 bytes), IP header (20 bytes), and Ethernet header (18 bytes). Calculate the number of packets required to transmit a 500 ms digital audio segment.
d. Assume that pipeline packet transmission technique is used, and the transmitter-receiver distance is 100 km. Calculate the end-to-end delay of transmitting and receiving an audio segment in Question 5c.
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