
Please help, stuck on a question about digital modulation..?
If we use an audio tone at 1 kHz on a phone line, ASK modulated with data rate 300 Hz, transmitting the sequence 10101010…,what frequencies are present in the spectrum of the modulated signal?
i really dont understand this question can anyone give me any help
You will have a square-wave with a fundamental frequency of 300 Hz
This will produce 300 Hz and all the odd harmonics out to infinity (300Hz, 900Hz, 1500Hz, 2100Hz, etc.)
You also have the carrier: 1000 Hz
You will also have the intermodulation products of the ASK amplitude modulation: 1000±300Hz, 1000±900 Hz, 1000±1500Hz , 1000±2100Hz, etc.
Note: that 1000-1500 won't show up on the spectrum analyzer, neither will 1000-2100, or 1000-2700, etc. but 2500, 3100, 3700 Hz will show up
.
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Martin,
Thanks for the clarification – in my haste I over-simplified! Of course, a typical 8-bit digital signal (or a compressed/encoded signal from a DVD/MP3 player etc) would not work here without conversion. As you point out, you would either need to convert this to a Pulse Width Modulated signal – or possibly a high sampling rate 1-bit bitstream.
But because you are still using a digital signal, it is in principle possible for lossless conversion in the digital domain from AES or SPDIF to something that can be amplified (very efficiently) and fed direct to the loudspeaker–with the D/A conversion occurring directly within the transducer.