Network signal receiving system and network signal receiving method
The disclosure provides a network signal receiving system and a network signal receiving method. The network signal receiving system comprises: a high pass filter, a canceller, and an adder. The high pass filter is utilized for performing a high pass filtering operation for an audio data signal to output at least a signal corresponding to transitions of the audio data signal, wherein the audio data signal is synchronized with a network data signal. The canceller is coupled to the high pass filter, and utilized for generating a noise cancelling signal according to the at least a signal output by the high pass filter. The adder is coupled to the canceller, utilized for receiving the network data signal and the noise cancelling signal, so as to use the noise cancelling signal to cancel at least a noise in the network data signal, which is corresponding to the at least a signal.
1. A network signal receiving system, comprising:
a high pass filter, for performing a high pass filtering operation for an audio data signal to output at least a signal corresponding to transitions of the audio data signal, wherein the audio data signal is synchronized with a network data signal;
a canceller, coupled to the high pass filter, for generating a noise cancelling signal according to the at least a signal output by the high pass filter; and
an adder, coupled to the canceller, for receiving the network data signal and the noise cancelling signal, so as to use the noise cancelling signal to cancel at least a noise in the network data signal, which is corresponding to the at least a signal.
2. The network signal receiving system of claim 1 , further comprising:
an analog-to-digital converter, positioned in a front stage of the high pass filter, wherein when the audio data signal is an audio receiving data signal and the network data signal is a network receiving data signal, the analog-to-digital converter is utilized for performing an analog-to-digital operation for the audio receiving data signal, and making the audio receiving data signal synchronized with the network receiving data signal.
3. The network signal receiving system of claim 2 , further comprising:
a low pass filter, positioned in a front stage of the analog-to-digital converter, for performing a low pass filtering operation for the audio receiving data signal.
4. The network signal receiving system of claim 2 , further comprising:
a multiplexer, coupled between the analog-to-digital converter and the high pass filter;
wherein when the multiplexer chooses to receive an echo signal of an audio transmitting data signal synchronized with the network receiving data signal, the high pass filter is utilized for filtering the echo signal to output at least a signal corresponding to transitions of the echo signal; and when the multiplexer chooses to receive the audio receiving data signal, the high pass filter is utilized for filtering the audio receiving data signal to output at least a signal corresponding to transitions of the audio receiving data signal.
5. The network signal receiving system of claim 4 , further comprising:
a synchronizing unit, positioned in a front stage of the multiplexer, for making the echo signal of the audio transmitting data signal synchronized with the network receiving data signal.
6. The network signal receiving system of claim 1 , further comprising:
a synchronizing unit, positioned in a front stage of the high pass filter, wherein when the audio data signal is an echo signal of an audio transmitting data signal and the network data signal is a network receiving data signal, the synchronizing unit is utilized for making the echo signal of the audio transmitting data signal synchronized with the network receiving data signal.
7. The network signal receiving system of claim 1 , wherein the network signal receiving system is a high definition multimedia interface (HDMI) system, the audio data signal is an audio return channel (ARC) data signal, and the network data signal is an HDMI ethernet channel (HEC) data signal.
8. The network signal receiving system of claim 1 , wherein the high pass filter is a 1-D filter.
9. A network signal receiving method, comprising:
performing a high pass filtering operation for an audio data signal to output at least a signal corresponding to transitions of the audio data signal, wherein the audio data signal is synchronized with a network data signal;
generating a noise cancelling signal according to the at least a signal output by the high pass filter; and
using the noise cancelling signal to cancel at least a noise in the network data signal, which is corresponding to the at least a signal.
10. The network signal receiving method of claim 9 , wherein before the step of outputting the at least a signal corresponding to the transitions of the audio data signal, the network signal receiving method further comprises:
when the audio data signal is an audio receiving data signal and the network data signal is a network receiving data signal, performing an analog-to-digital operation for the audio receiving data signal, and making the audio receiving data signal synchronized with the network receiving data signal.
11. The network signal receiving method of claim 10 , wherein before the step of performing the analog-to-digital operation for the audio receiving data signal, and making the audio receiving data signal synchronized with the network receiving data signal, the network signal receiving method further comprises:
performing a low pass filtering operation for the audio receiving data signal.
12. The network signal receiving method of claim 10 , further comprising:
performing a multiplexing operation to choose to receive the audio receiving data signal synchronized with the network receiving data signal or an echo signal of an audio transmitting data signal synchronized with the network receiving data signal;
wherein when the multiplexing operation chooses to receive an echo signal of an audio transmitting data signal synchronized with the network receiving data signal, performing the high pass filtering operation for the echo signal to output at least a signal corresponding to transitions of the echo signal; and when the multiplexing operation chooses to receive the audio receiving data signal, performing the high pass filtering operation for the audio receiving data signal to output at least a signal corresponding to transitions of the audio receiving data signal.
13. The network signal receiving method of claim 12 , wherein before the step of performing the multiplexing operation to choose to receive the audio receiving data signal synchronized with the network receiving data signal or the echo signal of the audio transmitting data signal synchronized with the network receiving data signal, the network signal receiving method further comprises:
performing a synchronizing operation to make the echo signal of the audio transmitting data signal synchronized with the network receiving data signal.
14. The network signal receiving method of claim 9 , wherein before the step of performing the high pass filtering operation for the audio data signal to output at least a signal corresponding to the transitions of the audio data signal, the network signal receiving method further comprises:
when the audio data signal is an echo signal of an audio transmitting data signal and the network data signal is a network receiving data signal, performing a synchronizing operation to make the echo signal of the audio transmitting data signal synchronized with a network receiving data signal.
15. The network signal receiving method of claim 9 , wherein the audio data signal is an audio return channel (ARC) data signal, and the network data signal is an HDMI ethernet channel (HEC) data signal.
16. The network signal receiving system of claim 9 , wherein the high pass filtering operation is a 1-D filtering operation.