TWI426788B - Audio transceiver and detecting method thereof - Google Patents

Description

Sound transceiver and detection method thereof

The invention relates to a sound transceiver and a detecting method thereof, in particular to a sound transceiver applied to a mobile phone and a detecting method thereof.

As shown in FIG. 1A and FIG. 1B, in the current mobile phone using the Qualcomm platform, a bias voltage built in the voice transceiver socket 1 of the mobile phone is inserted after the conventional voice transceiver 2 is inserted. The source (HSET_BIAS) 10 is connected to a microphone 20 in the conventional sound transceiver 2, and since the AC impedance of the microphone 20 is about 2K, the DC impedance value range is usually greater than or equal to 5KΩ, so the bias voltage is The current detected by the source 10 is 1.8V/(2.2KΩ+5KΩ)=250uA, which is less than the minimum detection value of the bias source 10 of 300uA, so the sound transceiver 2 cannot be detected to insert this action. Therefore, the method for detecting the insertion of the conventional voice transceiver 2 into the mobile phone is performed after the sound transceiver 2 is inserted, and after the switch 23 is pressed in parallel with the sound receiver 20, the microphone 20 is short-circuited at both ends, so that the bias source is The load of 10 is only 2.2KΩ, and the current on the bias source 10 is 1.8V/2.2KΩ=818μA, which is within the detection range of the bias source 10 (300μA~1.5mA), so after the switch 23 is pressed The bias source 10 can detect the "press" action in time, and generate a corresponding interrupt notification to the processor to respond accordingly.

Please refer to Figures 2A and 2B, which are conventional four-segment sound transceiver plugs and Schematic diagram of the socket. The conventional sound transceiver plug and socket are ordinary four-piece sound transceiver plugs and sockets if they are ordinary 2.5mm or 3.5mm sound transceiver plugs and sockets. The sound transceiver plugs sequentially contact the shrapnel of the sound transceiver socket, and the sound transceiver plugs correspond to the pins of the sound collector 20 and the loudspeaker 22 are 210 and 211, respectively, and the pins of the socket correspond to the audio input circuit 13 and the audio The pins of the output circuit 12 are 110 and 111, respectively. Therefore, when the sound transceiver 2 is inserted, the microphone pin 211 of the plug of the sound transceiver 2 first contacts the microphone pin 110 of the sound transceiver socket. The impedance of the sounder 22 is small (maximum 150 Ω). As can be seen from the connection of the above-mentioned circuits, when the two loudspeakers 22 are connected in common, the current of the bias source 10 is: 1.8V/2.2KΩ+ (0.15+0.15) KΩ=720uA, which not only exceeds the minimum value of current detection, but also corresponds to the current when switch 23 is pressed. Since the action of the sound transceiver 2 is slower than the processor processing time, it is highly probable that not only the sound transceiver 2 is immediately inserted but also the switch 23 is pressed when the sound transceiver plug is inserted. This causes misoperation.

In view of the above-mentioned problems of the prior art, the object of the present invention is to provide a sound transceiver and a detection method thereof for solving the problem that the mobile phone generates false detection when the sound transceiver is inserted into the mobile phone.

According to the purpose of the present invention, a sound transceiver is provided, which is applicable to an electronic device. The electronic device includes a processor and a detecting circuit. The detecting circuit further includes a bias source, and the detecting circuit detects the bias. The voltage source generates a current value due to the sound transceiver being inserted into the electronic device, and includes a switch, a first connector with a plurality of microphone pins and a microphone pin, a plurality of loudspeakers, and a sound receiver. . Wherein, each of the loudspeakers is connected to one of the loudspeaker pins, and the loudspeaker is controlled by a threshold. The adjusting circuit is connected to the microphone pin and is connected in parallel to the switch. The measured threshold adjusting circuit further comprises a resistor, a first capacitor and a second capacitor.

The detection circuit detects whether the current value meets an interval value. If the current value meets the interval value, an insertion signal is sent to the processor, and the insertion signal is inserted into the electronic device by the sound transceiver.

According to the object of the present invention, a method for detecting a sound transceiver is provided, which is applicable to an electronic device. The electronic device includes a processor and a detection circuit. The detection circuit further includes a bias source, and the detection circuit detects The bias voltage source generates a current value due to the sound transceiver being inserted into the electronic device, and the method includes the following steps: the detecting circuit detects whether the current value meets an interval value, and if the current value meets the interval value, sends a first signal to The processor, the first signal is inserted into the electronic device for the sound transceiver; if the current value does not meet the interval value, the detection circuit continuously detects.

If the processor receives the first signal, the method further includes the following steps: detecting whether the current value is greater than the interval value, and if the current value is greater than the interval value, sending a second signal to the processor, where the second signal is To press the switch of the sound transceiver; if the current value is less than the interval value, send a third signal to the processor, and the third signal is to disconnect the electronic device from the sound transceiver.

If the processor receives the second signal, the method further includes the following steps: detecting whether the current value is smaller than the interval value, and if the current value is less than the interval value, sending the third signal to the processor; if the current value is not less than The interval value is detected by the detection circuit.

According to the above, the sound transceiver and the detecting method thereof according to the present invention have the following advantages:

The sound transceiver and its detection method are internally designed by a newly designed sound transceiver. The circuit achieves two purposes of detecting the insertion of the sound transceiver and pressing the detection switch, and does not need to add a complicated detection circuit, thereby reducing the cost.

1‧‧‧Sound transceiver socket

10‧‧‧ bias source

100, 330‧‧‧ resistance

11‧‧‧Second connector

110‧‧‧Optical input circuit pin

111‧‧‧Optical output circuit pin

12‧‧‧Optical output circuit

13‧‧‧Optical input circuit

130‧‧‧Inductance

131, 14‧‧‧ capacitor

2, 3‧‧‧ sound transceiver

20, 32‧‧‧ loudspeakers

21, 30‧‧‧ first connector

210, 301‧‧‧ radio receiver pins

211, 302‧‧‧ loudspeakers

22, 31‧‧‧ loudspeakers

23, 34‧‧‧ switch

33‧‧‧Measured threshold adjustment circuit

331‧‧‧first capacitor

332‧‧‧second capacitor

S1~S7‧‧‧ steps

1A is a circuit diagram of a conventional sound transceiver socket; FIG. 1B is a circuit diagram of a conventional sound transceiver; FIG. 2A is a schematic diagram of a conventional sound transceiver plug; and FIG. 2B is a conventional sound transceiver FIG. 3 is a circuit diagram of a sound transceiver of the present invention and a circuit diagram of a conventional sound transceiver socket; and FIG. 4 is a flow chart of a method for detecting a sound transceiver of the present invention.

Please refer to FIG. 3, which is a circuit diagram of the sound transceiver of the present invention and a circuit diagram of a conventional sound transceiver socket. As shown, the sound transceiver 3 of the present invention includes a first connector 30, a plurality of loudspeakers 31, and a microphone 32. The loudspeakers 31 are respectively connected to one of the loudspeaker pins 302 of the first connector 30. After the loudspeakers 32 are connected in parallel with a switch 34, the first connector 30 is connected by a measured threshold adjustment circuit 33. The microphone pin 301. In addition, the measured threshold adjustment circuit 33 between the microphone 32 and the first pin 301 includes a resistor 330, a first capacitor 331 and a second capacitor 332, wherein the resistor 330, the first capacitor 331 and the second capacitor The 332 is connected in parallel with the microphone 32, and the switch 34, the resistor 330, the first capacitor 331 and the second capacitor 332 are connected to the microphone pin 301 and the microphone 32 at one end and to the other end. In addition, the resistance of the resistor 330 can be adjusted according to different requirements, and the resistance value used in this embodiment is 3KΩ. After the sound transceiver 3 of the present invention is inserted into the second connector 11 of the sound transceiver socket 1 of the mobile phone by the first connector 30, the bias source 10 passes through the second connection. The microphone pin 110 of the connector 11 is connected to the microphone pin 301 of the first connector 30, and is connected to the upper microphone 32. In addition, the bias source 10 is connected to one end of the resistor 100, the audio input circuit 13 is connected to one end of a capacitor 131, the other end of the capacitor 131 is connected to one end of the inductor 130, and the other end of the resistor 100, the inductor 130 The other end, the audio input circuit pin 110 and one of the capacitors 14 are connected, and the other end of the capacitor 14 is grounded. In the present embodiment, the DC resistance value of the sound collector 32 is 5KΩ, so after the sound transceiver 3 is inserted, the current value detected by the bias source 10 is 1.8V/2.2KΩ+[(5×3) /(5+3)]KΩ=442uA, which is greater than the minimum detected value of 300μA, so the action inserted by the sound transceiver 3 can be detected in time, and then a first signal is sent to the processor, and the first signal is The insertion signal for the sound transceiver socket 1 has been inserted to inform the processor that the sound transceiver 3 has been inserted. At this time, the bias source 10 continues to be detected by the current state. After the sound transceiver 3 is inserted, when the voice transceiver switch 34 is pressed, the current value of 800 μA or more is detected, and the current value of the bias source 10 is detected. The change, the action of pressing the switch 34 can be detected again, and then send a second signal to the processor, the second signal is to notify the processor that the sound transceiver 3 has been inserted into the sound transceiver socket 1 and pressed Sound transceiver switch 34. If the bias source 10 is detected to have a current value of less than 300 μA, a third signal is sent to the processor, which is to notify the processor that the sound transceiver 3 has been disconnected from the sound transceiver socket 1.

Please refer to FIG. 4, which is a flowchart of a method for detecting a sound transceiver of the present invention. The sound transceiver detection method is applicable to an electronic device. The electronic device includes a processor and a detection circuit. The detection circuit further includes a bias source. The method includes the following steps: detecting at step (S1) The measuring circuit detects whether a current value meets an interval value, and if so, sends a first signal to a processor in step (S2), and then in step (S3), the detecting circuit detects whether the current value meets the interval value, and if No, then at step (S4) detecting whether the current value is greater than the interval value, and if so, sending a second signal to the processor in step (S5), and proceeding to step (S6). In step (S6), the detecting circuit detects whether the current value is smaller than the interval value, and if so, sends a third signal to the processor in step (S7), and returns to step (S1). The current value is generated by the bias voltage of the bias source due to the different relationship between the sound transceiver and the electronic device: the first signal is the signal inserted by the sound transceiver, and the second signal is the pressed switch. The signal is the signal of the sound transceiver. In addition, in this embodiment, the interval value is 300μA~500μA, but it is not limited thereto, and it can be adjusted according to different situations.

If the current value detected in the step (S1) does not meet the interval value, the detection circuit continuously detects the current value; and if the current value detected in the step (S3) meets the interval value, the detection is performed. The measuring circuit continuously detects the current value; and if the current value detected in the step (S6) is not less than the interval value, the detecting circuit continuously detects the current value.

Thus, when an ordinary 2.5 mm or 3.5 mm sound transceiver socket 1 is used as the interface, the present invention can still detect the insertion of the sound transceiver 3, and can effectively prevent the sound transceiver 3 from being inserted during insertion due to the plug and the socket. The false detection caused by the misalignment is excluded because the current value 720uA generated during the insertion of the sound transceiver 3 is excluded from the interval value (300 μA to 500 μA), and the current value is stabilized at 440 uA until the sound transceiver 3 is stably inserted. The judgment of the sound transceiver insertion 3 is made, and the problem of misjudgment during the insertion process is solved.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1‧‧‧Sound transceiver socket

10‧‧‧ bias source

100, 330‧‧‧ resistance

11‧‧‧Second connector

110‧‧‧Optical input circuit pin

111‧‧‧Optical output circuit pin

12‧‧‧Optical output circuit

13‧‧‧Optical input circuit

130‧‧‧Inductance

131, 14‧‧‧ capacitor

3‧‧‧Sound transceiver

30‧‧‧First connector

301‧‧‧Speaker pin

302‧‧‧Amplifier pins

31‧‧‧ loudspeakers

32‧‧‧Audio

33‧‧‧ Circuitry

331‧‧‧first capacitor

332‧‧‧second capacitor

34‧‧‧ switch

Claims (14)

A sound transceiver is applicable to an electronic device. The electronic device includes a processor and a detecting circuit. The detecting circuit further includes a bias source, and the detecting circuit detects the bias source due to the sound. The transceiver is inserted into the electronic device to generate a current value, comprising: a switch; a first connector comprising a plurality of loudspeaker pins and a microphone pin; a plurality of loudspeakers, each of the amplifications The device is respectively connected to one of the plurality of loudspeaker pins; and a sound receiver connected to the microphone pin by a measured threshold adjustment circuit and connected in parallel, the measured threshold adjustment circuit The method includes: a resistor connected in parallel with the sound receiver; a first capacitor connected in parallel with the resistor; and a second capacitor connected in parallel with the first capacitor; wherein the detecting circuit detects whether the current value is An interval value is met. If the current value meets the interval value, an insertion signal is sent to the processor, and the insertion signal is inserted into the electronic device by the sound transceiver. The sound transceiver of claim 1, wherein the electronic device further comprises a second connector connected to the first connector. The sound transceiver of claim 1, wherein the electronic device is a mobile phone. The sound transceiver of claim 1, wherein the sound exchange of the sounder The impedance value is 1.8 to 2.4 kilo ohms. The sound transceiver of claim 4, wherein the sound impedance of the sound pickup is 2.2 kilo ohms. The sound transceiver of claim 5, wherein the microphone has a DC resistance value of at least 5 kilo ohms. The sound transceiver of claim 1, wherein the resistance is 1 to 5 kilo ohms. The sound transceiver of claim 7, wherein the resistance is 3 kilo ohms. The invention relates to a method for detecting a sound transceiver according to claim 1, which is applicable to an electronic device. The electronic device comprises a processor and a detecting circuit, and the detecting circuit further comprises a bias source. The detecting circuit detects that the bias source generates a current value by inserting the sound transceiver into the electronic device, and the method includes the following steps: the detecting circuit detects whether the current value meets an interval value; and if When the current value meets the interval value, a first signal is sent to the processor, and the first signal is inserted into the electronic device by the sound transceiver, and if the current value does not meet the interval value, the detection circuit continues to detect Measurement. For example, in the detection method of claim 9, wherein the interval value is 300 μA to 500 μA. The method of detecting the ninth aspect of the patent application, wherein if the processor receives the first signal, the method further includes the following steps: the detecting circuit detects whether the current value is greater than the interval value; and if the current value If the value is greater than the interval, a second signal is sent to the processor, and the second signal is the switch that presses the sound transceiver. For example, the detection method of claim 11 wherein the current value is less than the interval The value sends a third signal to the processor, and the third signal is that the sound transceiver is disconnected from the electronic device. For example, in the detecting method of claim 11, wherein the processor receives the second signal, the method further includes the following steps: the detecting circuit detects whether the current value is less than the interval value; and if the current value is less than The interval value sends the third signal to the processor. For example, in the detecting method of claim 13, wherein the detecting circuit continues to detect if the current value is not less than the interval value.