ࡱ> ilfgh bjbjVV << ?Rz,z,99y:y:y::::8:|A<:<? @ @ @wUwUwUCEEEEEE4֚E!y:wUT|UU"wUwUE99 @ @fcccwU9 @y: @CcwUCcc6}C:6 @r:W o~"/|0~B^8y:\wUwUcwUwUwUwUwUEEGanwUwUwUwUwUwUwUwUwUwUwUwUwUwUwUwUz, 8: Chapter 5 : Pulse Code Modulation Section 5.9 : Ex. 5.9.4 : A PCM system uses a uniform quantizer followed by a 7 bit encoder. The system bit rate is 50 Mbits/sec. Calculate the maximum bandwidth of the message signal for which this system operates satisfactorily. .Page No. 5-26. Soln. : It has been given that : Bit rate r = 50 Mbits/sec and N = 7 We know that bit rate r = N fs ( fs =  eq \f(r,N)  =  eq \f(50 ( 106,7)  = 7.14 MHz ( Maximum signal bandwidth BW = fs /2 =  eq \f(7.14 MHz,2)  ( BW = 3.57 MHz ...Ans. Ex. 5.9.5 : The bandwidth of a video signal is 4.5 MHz. This signal is to be transmitted using PCM with the number of quantization levels Q = 1024. The sampling rate should be 20% higher than the Nyquist rate. Calculate the system bit rate. .Page No. 5-26. Soln. : Bandwidth W = 4.5 MHz ( As per Nyquist rate fs = 2W = 9 MHz But fs should be 20% higher than Nyquist rate ( fs = 1.2 ( 9 MHz = 10.8 MHz ...(1) We know that, Q = 2N, ( 1024 = 2N ( N = 10 ...(2) ( System bit rate r = N fs = 10 ( 10.8 MHz Ex. 5.9.7 : Plot the characteristics of a (-law compressor. .Page No. 5-30 Soln. : To plot the characteristics of (-law compressor : The expression for the normalized output of a (-law compressor is given by, Z (x) = (  eq \f( \s\up 3(ln (1 + ( | x | )),ln (1 + ())  ..... x ( 1 Let ( = 255. Note that instead of |x| / xmax we have written only |x| and restricted the values of x only upto 1. This has the same effect as that of normalizing. ( Z (x) = (  eq \f( \s\up 3(ln (1 + 255 |x| )),ln 256)  ...(1) Substitute x = 0, 0.2, 0.4, 0.6, 0.8 and 1 in Equation (1) to get the corresponding values of Z as shown in the following table. | x |00.20.40.60.81Z0( 0.71( 0.84( 0.9( 0.96( 1Therefore the compressor characteristics is as shown in Fig. P. 5.9.7.  Fig. P. 5.9.7 : (-law compressor characteristics Section 5.15 : Ex. 5.15.7 : If a voice frequency signal is sampled at the rate of 32,000 samples/sec and characterized by peak value of 2 Volts, determine the value of step size to avoid slope overload. What is quantization noise power Nq and corresponding SNR ? Assume bandwidth of signal as 4 kHz. .Page No. 5-60. Soln. : Given : fs = 32,000 samples/sec. Peak value of the signal A = 2V. Bandwidth B = 4 kHz. 1. Step size ( to avoid slope overload : To avoid slope overload the following condition should be satisfied. A (  eq \f((,2 ( fm Ts) =  eq \f(\s\up5(( fs) , 2 ( fm) Substituting the values we get, 2 (  eq \f(( ( 32000,2 ( ( 4 ( 103) ( ( (  eq \f(2 ( 2 ( ( 4 ( 103, 32000)  ( ( ( 1.57 Volt ...Ans. 2. Quantization noise power (Nq) : The quantization noise power for a delta modulator is given by, Nq =  eq \f((2,3) =  eq \f((1.57)2,3)  ( Nq = 0.822 W ...Ans. 3. Signal to noise ratio : SNR =  eq \f (3 f\O(3,s),8 (2 f\O(2,m) B) =  eq \f (3 ( (32 ( 103)3,8 (2 ( (4 ( 103)2 ( 4 ( 103 ) = 19.45 Ex. 5.15.8 : A compact disc (CD) records audio signals digitally by PCM. Assume audio signal's bandwidth to be 15 kHz. If signals are sampled at a rate 20% above Nyquist rate for practical reasons and the samples are quantised into 65,536 levels, determine bits/sec required to encode the signal and minimum bandwidth required to transmit encoded signal. .Page No. 5-60 Soln. : W = 15 kHz, fs = 1.2 ( 2 W = 2.4 ( 15 kHz = 36 kHz, Q = 65,536. 1. Signaling rate (r) : We know that Q = 2N ( N = log2 Q ( N =  eq \f (log10 (65,536),log10 2 ) = 16 ...(1) Signaling rate r = N fs = 16 ( 36 kHz = 576 kbits/sec. ...Ans. Thus the signaling rate r is 576 kbits/sec. 2. Minimum bandwidth : BT =  eq \f(1,2) Signaling rate =  eq \f (576, 2) kbits/sec ( Minimum bandwidth BT = 288 kHz ...Ans. Ex. 5.15.9 : In a single integration DM scheme, the voice signal is sampled at a rate of 64 kHz. The maximum signal amplitude is 1 Volt. 1. Determine the minimum value of step size to avoid slope overload. 2. Determine granular noise power N0, if the voice signal bandwidth is 3.5 kHz. 3. Assuming signal to be sinusoidal, calculate signal power So and signal to noise ratio (SNR). 4. Assuming that the voice signal amplitude is uniformly distributed in the range, ( 1, 1), determine So and SNR. .Page No. 5-60 Soln. : Given : fs = 64 kHz A = 1 Volt 1. Minimum step size to avoid slope overload : A (  eq \f(( fs,2 ( fm), ( (min =  eq \f(\s\up5(2 ( fm A),fs) =  eq \f (2 ( ( 3.5 ( 103 ( 1,64 ( 103)  = 0.3436 Volt ...Ans. 2. Granular noise power : Nq =  eq \f ((2, 3) (  eq \f (\s\up5(fm),fs) =  eq \f ((0.3436)2,3) (  eq \f (3.5,64) = 2.15 ( 10 3 W ...Ans. 3. Signal power So and SNRo : As the signal is sinusoidal, the normalized output signal power So = [A/ eq \r(2)]2 = A/2 = 1/2 Watt. ...Ans. ( SNRo =  eq \f (\s\up5(So),Nq) =  eq \f (0.5, 2.15 ( 10 3) = 232.3 or 23.66 dB. 4. Signal power for uniformly distributed signal : The signal PDF for a uniformly distributed signal is as shown in Fig. P. 5.15.9.  Fig. P. 5.15.9 ( Mean square value of the signal, E[S2] =  eq \a (1, (, 1)S2 ( fs (S) dS =  eq \f(1,2)  eq \a (1,(, 1) S2 dS =  eq \f(1,2) [S3 / 3]\O(1, 1) = 1/3 Assuming R = 1. Normalized signal power So = Mean square value = 1/3 W ...Ans. Signal to noise ratio = SNR =  eq \f(1/3 W,2.15 ( 10 3 W) = 155.03 or 21.9 dB ...Ans. Ex. 5.15.10 : The information in an analog signal voltage waveform is to be transmitted over a PCM system with an accuracy of ( 0.1 % full scale accuracy. The analog voltage waveform has a bandwidth of 100 Hz and an amplitude range of 10 to + 10 Volts. (a) Determine the minimum sampling rate required. (b) Determine the number of bits in each PCM word. (c) Determine the minimum bit rate required in the PCM system. (d) Determine the minimum absolute channel bandwidth required for the transmission of the PCM signal. .Page No. 5-61 Soln. : It has been given that, 1. Accuracy of ( 0.1 % of full scale is expected. 2. W = 100 Hz and amplitude range is 10 to + 10 V (a) Sampling rate fs : By sampling theorem the minimum sampling rate is fs (min) = 2W = 200 Hz ...Ans. (b) Number of bits per word (N) : As accuracy is expected to be ( 0.1 % of full scale, the maximum quantization error should be ( 0.1 % of full scale. ( (max = ( 0.1 % of full scale = ( 0.001 [10 ( 10)] = ( 0.001 ( 20 ( (max = ( 0.02 Volts ...(1) We know that the maximum value of the quantization error is (max = ( S/2 ...(2) ( ( S/2 = ( 0.02 ( S = 0.04 Volt ...(3) But S =  eq \f(\s\up5(VH VL),Q) where VH = 10 V and VL = 10 V ( Q =  eq \f (10 + 10,0.04) =  eq \f(20,0.04) = 500 ...(4) But Q = 2N ( N log10 2 = log10 500 ( N = 8.96 ( 9 ...Ans. (c) System bit rate : System bit rate (r) = N fs = 9 ( 200 = 1800 bits/sec ...Ans. (d) Transmission channel bandwidth (BT) : BT (  eq \f(1,2) N fs ( BT ( 900 Hz ...Ans. Ex. 5.15.11 : The information in an analog waveform with a maximum frequency fm = 3 kHz is to be transmitted over an M level PCM system, where the number of pulse levels is M = 16. The quantization distortion is specified not to exceed 1% of peak to peak analog signal. 1. What is the maximum number of bits per sample that should be used in this PCM system ? 2. What is the minimum sampling rate and what is the resulting bit transmission rate ? .Page No. 5-61 Soln. : Given : fm = 3 kHz, Number of quantization levels M = 16. 1. Number of bits/sample (N) : We know that, number of quantization levels M = 2N. ( 2N = 16 ( N = 4 ...Ans. 2. Minimum sampling rate : By sampling theorem : fs (min) = 2 fm = 2 ( 3 kHz ( fs (min) = 6 kHz ...Ans. 3. Bit transmission rate : r = N fs = 4 ( 6 kHz ( r = 24 kbits/sec. ...Ans. ( Number of quantization levels, Q = 2N = 27 = 128 ...Ans. Ex. 5.15.12 : A TV signal with a bandwidth of 4.2 MHz is transmitted using binary PCM. The number of quantization levels is 512. Calculate : 1. Code word length 2. Transmission bandwidth 3. Final bit rate 4. Output signal to quantization noise ratio. .Page No. 5-61 Soln. : Given : fm = 4.2 MHz and Q = 512. 1. Code word length (N) : Q = 2N ( N = eq \f(\s\up5(log 512), log 2) ( N = 9 bits/word ...Ans. 2. Transmission bandwidth : BT =  eq \f(1,2) N fs =  eq \f(1,2) N (2 fm) ( BT = 9 ( 4.2 MHz = 37.8 MHz ...Ans. 3. Final bit rate (r) : r = N fs = 9 ( 2 ( fm = 18 ( 4.2 MHz ( r = 75.6 Mb/s ...Ans. 4. Signal to quantization noise ratio : Since the TV signal is not a sinusoidal signal, let us use the general expression of signal to quantization noise ratio.  eq \b\bc\[(\f(S,Nq)) = 4.8 + 6 N dB = 4.8 + (6 ( 9) (  eq \f(S, Nq) = 58.8 dB ...Ans. This is the maximum signal to noise ratio that we are expected to get from this system. Ex. 5.15.13 : The output signal to noise ratio (SNR) of a 10 bit PCM was found to be 30 dB. The desired SNR is 42 dB. It was decided to increase the SNR to the desired value by increasing the number of quantization levels. Find fractional increase in the transmission bandwidth required for this SNR. .Page No. 5-61 Soln. : Given : SNR = 30 dB, N = 10 Desired value of SNR = 42 dB. 1. To find N for SNR = 42 dB With increase in N by 1 bit the value of SNR increases by 6 dB. Therefore to increase the value of SNR by 12 dB it is necessary to increase N by 2. ( N = 10 + 2 = 12 ...Ans. 2. Fractional increase in BW : BW of PCM system =  eq \f (1,2) N fs ( BW with N = 10 is given by, BW10 =  eq \f (1,2) ( 10 fs = 5 fs and BW with N = 12 is given by, BW12 =  eq \f (1,2) ( 12 fs = 6 fs ( Change in BW = ( BW = 6 fs 5 fs = fs ( Fractional change in BW =  eq \f (( BW,BW10) =  eq \f (\s\up5(fs),5 fs) ( 100 % = 20 % ...Ans. Ex. 5.15.14 : A telephone signal with cut-off frequency of 4 kHz is digitised into 8 bit PCM, sampled at Nyquist rate. Calculate the baseband transmission bandwidth and quantization S/N ratio. .Page No. 5-61 Soln. : 1. The Nyquist rate = 2 ( 4 kHz = 8 kHz. 2. Transmission bandwidth, BT =  eq \f (1,2) ( N fs =  eq \f (1,2) ( 8 ( 8 kHz = 32 kHz ...Ans. 3. SNRq = (1.8 + 6N) dB = 1.8 + (6 ( 8) = 49.8 dB ...Ans. Ex. 5.15.15 : In a single integration DM scheme the voice signal is sampled at a rate of 64 kHz. The maximum signal amplitude is 2 Volts. Voice signal bandwidth is 3.5 kHz. Determine the minimum value of step size to avoid slope overload and granular noise power. .Page No. 5-61 Soln. : Given : fs = 64 kHz, Amax = 2V, fm = 3.5 kHz 1. Minimum step size to avoid slope overload : We know that Amax =  eq \f (\s\up5((min fs),2 ( fm) ( (min =  eq \f (\s\up5(2 ( fm Amax),fs) =  eq \f (2 ( ( 3.5 ( 103 ( 2,64 ( 103 ) = 0.6872 Volt ...Ans. 2. Granular noise power : Nq =  eq \f ((2,3) (  eq \f (\s\up5(fm),fs) =  eq \f ((0.6872)2,3) (  eq \f(3.5,64) = 8.6 ( 10 3 W ...Ans. Ex. 5.15.16 : A television signal (video and audio) has a bandwidth of 4.5 MHz. This signal is sampled, quantized and binary coded to obtain a PCM signal. 1. Determine the sampling rate if the signal is to be sampled at a rate 20% above the Nyquist rate. 2. If the samples are quantized into 1024 levels, determine the number of binary pulses required to encode each sample. 3. Determine the binary pulse rate (bits per second) of binary coded signal and the minimum bandwidth required to transmit the signal. If above linear PCM system is converted to companded PCM, will the output bit rate changed ? Justify. .Page No. 5-62 Soln. : Given : W = 4.5 MHz 1. Sampling rate = 1.2 ( Nyquist rate = 1.2 ( 2 W = 1.2 ( 2 ( 4.5 ( 106 = 10.8 MHz ...Ans. 2. Given that number of quantization levels, Q = 1024 But Q = 2N ( Number of binary pulse per word, N = log2 Q ( N = log2 1024 ( N = 10 ...Ans. 3. Binary pulse rate (bit rate) = N fs = 10 ( 10.8 MHz = 108 Mbps ...Ans. Bandwidth =  eq \f(1,2) bit rate = 54 MHz ...Ans. Ex. 5.15.17 : A compact disc (CD) records audio signals digitally by using PCM. Assume the audio signal bandwidth to be 15 kHz. 1. What is Nyquist rate ? 2. If the Nyquist samples are quantized into L = 65,536 levels and then binary coded,determine the number of binary digits required to encode a sample. 3. Determine the number of binary digits per second (bit/s) required to encode the audio signal. 4. For practical reasons, the signals are sampled at a rate well above Nyquist rate at 44,100 samples per second. If L = 65,536, determine number of bits per second required to encode the signal and transmission bandwidth of encoded signal. .Page No. 5-62. Soln. : Given : W = 15 kHz 1. Nyquist rate = 2 W = 2 ( 15 kHz = 30 kHz. ...Ans. 2. Number of quantization levels Q = 65,536 we know that Q = 2N ( 2N = 65,536 ( N = 16 bits. ...Ans. ( Number of bits to encode each sample is N = 16. 3. Number of bits per second = Number of samples/sec. ( Number of bits/sample = 15 ( 103 ( 16 = 240 k bits/sec. ...Ans. 4. Practical sampling rate fs = 44.1 kHz ( Number of bits per second = 44.1 ( 16 ( 103 = 705.6k bits/sec. ( Transmission bandwidth B =  eq \f (Bit rate,2) =  eq \f (705.6 ( 103,2) = 352.8 kHz. ...Ans. Ex. 5.15.18 : A Delta Modulator system operates at 3 times Nyquist rate for signal with 3.3 kHz bandwidth. The quantisation step is 250 mV. Determine the maximum amplitude of a 1 kHz input sinusoid for which the DM does not show slope overload. .Page No. 5-62. Soln. : Given : W = 3.3 kHz, fm = 1 kHz, ( = 250 mV, fs = 3 ( 2W = 19.8 kHz. 1. Let the maximum amplitude of 1 kHz input sinusoid be A. The condition to avoid the slope overload is A (  eq \f ((,(m Ts) ( Maximum value of A =  eq \f ((,(m Ts) =  eq \f (( fs,2 ( fm) Substituting the values we get, Amax =  eq \f(250 ( 10 3 ( 19.8 ( 103,2 ( ( 1( 103 ) ( Amax = 0.787 Ex. 5.15.19 : An audio signal with highest frequency component 3300 Hz is pulse code modulated with a sampling rate of 8000 samples/sec. The required signal-to-quantisation noise ratio is 40 dB. 1. What is the minimum number of uniform quantising levels needed ? 2. What is the minimum number of bits per sample needed ? 3. Calculate the minimum number of bits per sample needed ? .Page No. 5-62. Soln. : Given : fs = 8000 samples/sec. , fm = 3300 Hz.  eq \f(S,Nq) = 40 dB 1. To calculate Q and N : Assuming the input signal to be non sinusoidal we write S/N = (4.8 + 6 N) dB ( 40 = 4.8 + 6N ( N = 5.86 ( 6 ...Ans. Thus the number of bits per word is 6. Q = 2N = 26 = 64 ...Ans. Thus the number of quantization level is 64. 2. The signaling rate (r) : r = N fs = 6 ( 8 ( 103 = 48 kbits/sec. 3. Transmission bandwidth : Minimum BW, BT =  eq \f(1,2) r = 24 kHz. Ex. 5.15.20 : Delta modulator (DM) gives output pulses + p (t) of p (t). The output of DM is + p (t) when instantaneous sample is larger than previous sample value and is p(t) when instantaneous sample is smaller than previous sample value (last sample). The p(t) has 2 microsecond duration and 628 mV amplitude and repeats every 10 microsecond. Plot the input and output of DM on graph paper one below other to same scale if the input to DM is 1 Volt sine wave of frequency 10 kHz for one cycle of input wave. What is the maximum frequency with 1 Volt amplitude that can be used in this system without slope overload distortion. .Page No. 5-62. Soln. Part I : To plot the DM signal The D. M. Signal is as shown in Fig. P. 5.15.20.  Fig. P. 5.15.20 : DM signal Part II : Maximum frequency : Given : A = 1V, fm = 10 kHz, fs = 1/Ts = 1/10 ( s = 100 kHz. ( = 265 mV. 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