Analog signal recording system
One embodiment of the present invention provides a signal-recording system. During operation, the system receives a wideband multi-channel radio frequency (RF) signal, which includes a plurality of single-channel RF signals modulated at different carrier frequencies. The system down-converts the received wideband multi-channel RF signal to baseband, and records the down-converted signal.
1. A method for recording and replaying radio frequency (RF) signals, comprising:
receiving a wideband multi-channel radio frequency (RF) signal, which includes a plurality of single-channel RF signals modulated at different carrier frequencies;
down-converting the received wideband multi-channel RF signal to obtain an analog baseband signal; and
recording the analog baseband signal in an analog format.
2. The method of claim 1 , further comprising:
up-converting the recorded analog baseband signal to RF domain; and
receiving the up-converted signal, thereby enabling a replay of a single-channel RF signal selected from the plurality of single-channel RF signals.
3. The method of claim 1 , wherein down-converting the received wideband multi-channel RF signal involves a quadrature down-conversion process.
4. The method of claim 1 , wherein the wideband multi-channel RF signal includes one of:
a broadcast TV signal;
a cable TV signal;
a satellite TV signal;
a broadcast radio signal;
a WiFi signal; and
a mobile phone signal.
5. The method of claim 4 , wherein the broadcast TV signal covers an entire ultra high frequency (UHF) TV band.
6. The method of claim 1 , wherein recording the analog baseband signal involves a recorder based on magnetic tapes.
7. The method of claim 1 , wherein the wideband multi-channel RF signal has a bandwidth that exceeds 400 MHz.
8. A system for recording and replaying radio frequency (RF) signals, comprising:
a receiving mechanism configured to receive a wideband multi-channel radio frequency (RF) signal, which includes a plurality of single-channel RF signals modulated at different carrier frequencies;
a down-converter configured to down-convert the received wideband multi-channel RF signal to obtain an analog baseband signal; and
a signal-recorder configured to record the analog baseband signal in an analog format.
9. The system of claim 8 , further comprising:
an up-converter configured to up-convert the recorded signal to RF domain;
a second receiving mechanism configured to receive the up-converted signal; and
a signal-player coupled to the second receiving mechanism, wherein the signal-player is configured to replay a single-channel RF signal selected from the plurality of single-channel RF signals.
10. The system of claim 8 , wherein the down-converter is a quadrature down-converter.
11. The system of claim 8 , wherein the wideband multi-channel RF signal includes one of:
a broadcast TV signal;
a cable TV signal;
a satellite TV signal;
a broadcast radio signal; and
a mobile phone signal.
12. The system of claim 11 , wherein the broadcast TV signal covers an entire ultra high frequency (UHF) TV band.
13. The system of claim 8 , wherein the signal-recorder includes a recorder based on magnetic tapes.
14. The system of claim 8 , wherein the wideband multi-channel RF signal has a bandwidth that exceeds 400 MHz.