Signal transmission between electronic device and keyboard using high/low pass filters

An electronic device, wherein the electronic device comprises a first low-pass filter, a second low-pass filter, a first high-pass filter, a second high-pass filter, a first contact point, and a second contact point, each of the first low-pass filter and the first high-pass filter is connected to the first contact point, and each of the second low-pass filter and the second high-pass filter is connected to the second contact point;

• the second contact point is configured to be in contact with a third contact point on a keyboard;
• the first contact point is configured to be in contact with a fourth contact point on the keyboard;
• the first low-pass filter is configured to transmit a power signal to the first contact point;
• the second low-pass filter is configured to transmit a GND signal to the second contact point;
• the first high-pass filter is configured to process key position information transmitted by the keyboard to the first contact point;
• the second high-pass filter is configured to process key position information transmitted by the keyboard to the second contact point;
• or the first high-pass filter is configured to process key position information transmitted by the keyboard to the first contact point, and the second high-pass filter is configured to process key position information transmitted by the keyboard to the second contact point;
• the first high-pass filter is further configured to transmit first information to the first contact point;
• or the second high-pass filter is further configured to transmit the first information to the second contact point, wherein the first information is used to request the keyboard to establish a communication connection;
• and
• the first high-pass filter is further configured to process second information transmitted by the keyboard to the first contact point;
• or the second high-pass filter is further configured to process second information transmitted by the keyboard to the second contact point, wherein the second information is used to indicate that the keyboard establishes a communication connection to the electronic device.

A keyboard, wherein the keyboard comprises a third low-pass filter, a fourth low-pass filter, a third high-pass filter, a fourth high-pass filter, a third contact point, and a fourth contact point, each of the third low-pass filter and the third high-pass filter is connected to the third contact point, and each of the fourth low-pass filter and the fourth high-pass filter is connected to the fourth contact point;

• the fourth contact point is configured to be in contact with a first contact point on an electronic device;
• the third contact point is configured to be in contact with a second contact point on the electronic device;
• the third low-pass filter is configured to process a GND signal transmitted by the electronic device to the third contact point;
• the fourth low-pass filter is configured to process a power signal transmitted by the electronic device to the fourth contact point;
• the third high-pass filter is configured to transmit key position information to the third contact point;
• the fourth high-pass filter is configured to transmit the key position information to the fourth contact point;
• or the third high-pass filter is configured to transmit the key position information to the third contact point, and the fourth high-pass filter is configured to transmit the key position information to the fourth contact point;
• the third high-pass filter is further configured to process first information transmitted by the electronic device to the third contact point;
• or the fourth high-pass filter is further configured to process first information transmitted by the electronic device to the fourth contact point, wherein the first information is used to request the keyboard to establish a communication connection;
• and
• the third high-pass filter is further configured to transmit second information to the third contact point;
• or the fourth high-pass filter is further configured to transmit the second information to the fourth contact point, wherein the second information is used to indicate that the keyboard establishes a communication connection to the electronic device.