DSP 10 Multirate Signal Processing CESd SP EEET
- Slides: 36
DSP 10 Multirate Signal Processing ��������� ดร. พระพล ยวภษตานนท ภาควชา วศวกรรมอเลกทรอนกส CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -1
Multitrate Signal Processing • รวมความถง Downsampling, Upsampling Decimation Interpolation และ Oversampling • Downsampling คอ การลดอตราสมลง โดยสมจากสญญาณสมอกครง • Upsampling คอ การเพมอตราสมขน โดยการใสศนย zero padding • Oversampling คอ การเพมอตราสม ใหมากกวา Nyquist frequency CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -4
������ oversampling �� CD ����������� (�� Oversampling ������� LPF Nyquist frequency (fs/2) �������������� (������ ) ����������� Aliasing (������ , �� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -5
Quantization • การทำ quantization ทำใหเกด CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon Noise DSP 9 -6
Signals: 3 Bit Vs 8 Bit 3 Bit CESd. SP 8 Bit EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -7
Quantization Errors: 3 Bit Vs 8 Bit CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -8
Oversampling - Noise shaping ����� noise ��������� Shaper ����� noise ����� Shaper Noise ��� “������ ” ������� �� CD ���� MASH (Panasonic) ������� third-order noise shaper CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -10
���������� D/A ������� fs 1 A/D ������� fs 2 ��� fs 1 < fs 2 ���������� fs 2 < fs 1 ����� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -11
CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -12
���������� (Bandlim ������ downsampling ����������� D ������ a ������ CESd. SP D/A EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon A/D DSP 9 -13
��������� D/A ��� �������� aliasing ������� A/D ��� 2������� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -14
��������� D =3 ����� y(n) ������� x(n) (�� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -15
Downsampling ����������� D ���� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -16
������ downsampling D=2 D=3 dsp_10_2. eps CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -17
�������� downsampling D=2 D=3 dsp_10_3. eps CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -18
Upsampling CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -19
������ upsampling I=2 I=3 dsp_10_4. eps CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -20
�������� upsampling I=2 I=3 dsp_10_5. eps CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -21
���� “���� ” ������ downsampling ��� upsampling ������� ? ��������� downsampling ������ sampling ������ CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -22
��� sampling ������������ D ����������� (aliasing formula) ������� sampling CESd. SP downsampling EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -23
�������� aliasing ��� D=3 ���� aliasing CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -24
����� (Decimation) ������ (decimator)= downsampler+����� (� ����� LPF ����� =1 CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -25
�������� (Interpolation) ��������� (interpolator)= upsampler+����� LPF ����� = ����� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -26
������� upsampling ��� Interpolation upsampling Interpolation CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon dsp_10_6. eps DSP 9 -27
���������� Compact Disc����� 64 fs, 1 bit fs, 20 bit 64 fs, 1 bit 1 -bit Decimation PCM Interpolation Delta-Sigma ADC filter Recorder filter Modulator front end 64 fs, 1 bit Pulse code modulation ����� (record) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon Analogue Low pass filter ���� (play DSP 9 -28
���������� ������ cascade ��������� �������������� =1 LPF ������ = y(n) ������ x(n) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -29
������������ LPF ���������� =��� ���������� ����� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -30
������ x(n) ������� xa(t) ��������� y(n) ����������� ��������� �������� fsx= 8 k. Hz LPF fsy=10 k. Hz LPF �� �������� 5 ������ CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -31
���������� CD �� DAT (Digital Audio Tape) CD ������ 44. 1 k. Hz DAT ������ 48 k. Hz ����������������� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -32
������������ fscd= 44. 1 k. Hz LPF f. DAT=48 k. Hz LPF �� �������� 160 ������ SACD �������� CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -33
Super Audio CD 64 fs, 1 bit 1 -bit ADC front end 64 fs, 1 bit PCM Recorder Pulse code modulation ����� (record) CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon Analogue Low pass filter ���� (play DSP 9 -34
��������� SACD CESd. SP EEET 0485 Digital Signal Processing http: //embedsigproc. wordpress. com Asst. Prof. Dr. P. Yuvapoositanon DSP 9 -35
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