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Princípios de Telecomunicações PRT60806 Aula 16: Modulações Analógicas – AM Professor: Bruno Fontana da silva 2014 1

Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

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Page 1: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Princípios de Telecomunicações PRT60806

Aula 16: Modulações Analógicas – AM Professor: Bruno Fontana da silva

2014

1

Page 2: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Sinal modulante (informação)

•

Page 3: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Sinal Modulado (portadora)

• ê

çã

ê

Page 4: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Modulação AM-DSB/SC

• çã

çã

ê ã ã

• é

Page 5: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Modulação AM-DSB/SC

Page 6: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Modulação AM-DSB

•

é í ê

• çã é

çã çã

çã

Page 7: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Modulação AM-DSB

Page 8: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Modulação AM-DSB

Page 9: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Banda do sinal AM é

çã

ê

Page 10: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Espectro do sinal AM-DSB

• ê

• – –

• ê

•

ã ê

Page 11: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Espectro do sinal AM-DSB/SC

• ê

•

• ê ã

•

é á ê

Page 12: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Detecção de Envelope

(LATHI, 1998)

Page 13: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Índice de modulação • ã

• çã é á

Page 14: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Potência do sinal recebido AM-DSB

– à– à

Page 15: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Eficiência da modulação Am-DSB

ê ê ê

ê çã ê ê

Page 16: Princípios de Telecomunicações · (b) for all t Envelope A m(t) for all t Envelope (c) (e) (d) Figure 4.8 AM signal and its envelope. * E(t) must also be a slowly varying signal

Eficiência da modulação Am-DSB çã

é óú ê

ê çã é çã í çã

á ê á é

í çã µm

í çã çã

é í

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