CN102332881A

CN102332881A - Headset volume control circuit of key general mobile phone

Info

Publication number: CN102332881A
Application number: CN201110324918A
Authority: CN
Inventors: 韦良忠; 刘燕
Original assignee: WUXI ALEDEAR INTELLIGENT TECHNOLOGY Co Ltd
Current assignee: WUXI ALEDEAR INTELLIGENT TECHNOLOGY Co Ltd
Priority date: 2011-10-24
Filing date: 2011-10-24
Publication date: 2012-01-25
Anticipated expiration: 2031-10-24
Also published as: CN102332881B

Abstract

The invention discloses a headset volume control circuit of a key general mobile phone. The headset volume control circuit is characterized by comprising a power processing circuit 104, a key processing circuit 101, a decoding circuit 102, a resistance switch array 103 and a microphone (MIC) output control switch 105, wherein audio signals, which are output by a mobile phone headset, of left and right sound channels respectively pass through a first resistor R1 and a second resistor R2 and then are short-circuited together to synthesize a sound; the audio signals enter the resistance switch array 103 inside the circuit through a Vh pin; and by controlling different resistance switches, the audio signals pass through resistors with different sizes and are output to an external headset loudspeaker through a Vw pin so as to control volume size. The headset volume control circuit can be applied to any mobile phone. A direct current reference level of an MIC pin of the mobile phone serves as a power supply in the headset volume control circuit, so a current which can be supplied is smaller, the own power consumption of a designed chip is quite low, and an independent power supply is not required.

Description

Button general mobile phone earpiece volume control circuit

Technical field

The present invention relates to the technical field of earpiece volume control, relate in particular to the technical field of handset earphone volume control.

Background technology

The handset earphone of usefulness has two kinds of situation on the market now, and the one, the earphone of each mobile phone brand bundle sale, this earphone can only be used on the corresponding mobile phone model, and other mobile phones can not use; The 2nd, the earphone that sells separately on the market, this earphone also can only be used on the type of appointment, can't be general.In view of function; The situation of handset earphone is very chaotic on the market, and the earphone that has can not be regulated volume, and the earphone that has need carry out sign indicating number is discerned with mobile phone inside; The adjusting volume that has realizes through transferring the mechanical type potentiometer; Volume is very big, and the external battery that needs that has could realize that volume regulates, exist equally the big cost of volume high problem.Thereby handset earphone on the market exist can not be general, the function imperfection, cost is high, uses shortcomings such as inconvenience.

Summary of the invention

The present invention has realized a kind of earpiece volume control circuit that can on any mobile phone, use, and regulates through realize volume simply and easily by key control.

The present invention adopts following technical scheme for realizing above-mentioned purpose:

Button general mobile phone earpiece volume control circuit is characterized in that: comprise power supply processing circuit 104, button treatment circuit 101, decoding circuit 102, resistance switch array 103, MIC output control switch 105;

The audio signal of the left and right acoustic channels of handset earphone output each respectively together through first resistance R 1, second resistance R, 2 back short circuits; Realize the synthetic of sound; Get into the said resistance switch array 103 of inside circuit then through the Vh pin,, let audio signal through different big or small resistance through controlling different resistance switchs; Output on the external earphone horn through the Vw pin, thus the size of control volume;

Said button treatment circuit 101 comprises volume rising PU counting input end and volume decline PD counting input end, and said two inputs meet key switch S1, S2 respectively; The PU input port has shake removal function; Inside is connected to pull-up resistor, can keep the PU end to be high level at ordinary times, when PU end input low level; Internal counter begins execution and adds counting; After decoding circuit 102 decodings, the sliding unit of said resistance switch array 103 is moved up, the resistance between Vh and the Vw reduces, and volume increases; The PD input port has shake removal function; Inside is connected to pull-up resistor, can keep the PD end to be high level at ordinary times, when PD end input low level; Internal counter begins execution and subtracts counting; After decoding circuit 102 decodings, the sliding unit of said resistance switch array 103 is moved down, the resistance between Vh and the Vw increases, and volume reduces;

Said resistance switch array 103 comprises the resistance unit and the sliding unit of 8 series connection; Two end points in each unit all have can be by the tapping point of sliding unit visit; To data adding in button treatment circuit 101/down counter counting that the visit of sliding unit tapping point position is imported by PU, two inputs of PD, realize through the electronic switch of control single contact after the decoder for decoding in the decoding circuit 102 then;

This circuit power is to utilize the dc reference level of mobile phone MIC pin as power supply; When electric circuit inspection when having button effectively to import; Earlier MIC output control switch 105 is broken off; When volume was regulated end, again with MIC output control switch 105 closures, string had the 3rd resistance R 3 to carry out current limliting between CMIC port and microphone;

Said power supply processing circuit 104 and the 3rd capacitor C 3, the first capacitor C 1 are formed the negative supply voltage-multiplying circuit, produce a negative supply at the VEE end and supply with resistance switch array 103, guarantee audio signal through electric resistance array the amplitude and the distortion factor

The present invention has realized a kind of earpiece volume control circuit that can on any mobile phone, use; Power supply in the circuit of the present invention is to utilize the dc reference level of mobile phone MIC pin as power supply simultaneously; Thereby the electric current that can provide is less; So the oneself power consumption of the chip of design is very low, does not need independent power supply.

Description of drawings

Fig. 1 is a circuit diagram of the present invention.

Embodiment

A kind of button general mobile phone earpiece volume control circuit as shown in Figure 1 mainly comprises: power supply processing circuit 104, button treatment circuit 101, decoding circuit 102, resistance switch array 103, MIC output control switch 105 etc.

The principle of carrying out volume control among the present invention is different with conventional method, and what general volume adjusting utilized is the principle of electric resistance partial pressure, and signal input soon inserts a string resistance and arrives ground; Volume output is taken out in the middle of resistance string, realizes the volume adjusting thereby obtain part voltage, and the resistance that this method needs is bigger; Be generally tens kilo-ohms; And the present invention is a method of utilizing the resistance series connection, is about to a string resistance string be connected between signal and the earphone horn, through changing the size of resistance; Realization is to the adjusting of loudspeaker electric current, thereby realization is to the adjusting of volume.

Short circuit together after the present invention respectively passed through a resistance R 1, R2 with the audio signal of the left and right acoustic channels of handset earphone output; Realize the synthetic of sound; Get into the resistance switch array 103 of inside circuit then through the Vh pin,, let audio signal through different big or small resistance through controlling different resistance switchs; Output on the external earphone horn through the Vw pin, thus the size of control volume.

Resistance switch array 103 comprises the resistance unit of 8 series connection; Two end points in each unit all have can be by the tapping point of sliding unit visit; To data adding in button treatment circuit 101/down counter counting that the visit of sliding unit tapping point position is imported by PU, two inputs of PD, realize through the electronic switch of control single contact after the decoder for decoding in the decoding circuit 102 then.

The PU input port is a volume rising counting input end, has shake removal function, and inside is connected to pull-up resistor; Can keep the PU end to be high level at ordinary times; When PU end input low level, internal counter begins execution and adds counting, after decoding circuit 102 decodings, sliding unit is moved up; Resistance between Vh and the Vw reduces, and volume increases.

The PD input port is a volume decline counting input end, has shake removal function, and inside is connected to pull-up resistor; Can keep the PD end to be high level at ordinary times; When PD end input low level, internal counter begins execution and subtracts counting, after decoding circuit 102 decodings, sliding unit is moved down; Resistance between Vh and the Vw increases, and volume reduces.

Power supply in the invention circuit is to utilize the dc reference level of mobile phone MIC pin as power supply, thereby the electric current that can provide is less, so the oneself power consumption of the chip of design is very low; When electric circuit inspection when having button effectively to import, earlier MIC output control switch 105 is broken off, reduce electric current demand to power supply; When volume is regulated end; With MIC output control switch 105 closures, in order to reduce the electric current of microphone, the resistance R 3 that needs between CMIC port and microphone, to go here and there is carried out current limliting again.

Power supply processing circuit 104 is formed the negative supply voltage-multiplying circuit with C3, C1, produces a negative supply at the VEE end and supplies with resistance switch array 103, guarantee audio signal through electric resistance array the amplitude and the distortion factor.

Claims

1. button general mobile phone earpiece volume control circuit is characterized in that: comprise power supply processing circuit (104), button treatment circuit (101), decoding circuit (102), resistance switch array (103), MIC output control switch (105);

Each passes through first resistance (R1), second resistance (R2) back short circuit respectively together the audio signal of the left and right acoustic channels of handset earphone output; Realize the synthetic of sound; Get into the said resistance switch array (103) of inside circuit then through the Vh pin,, let audio signal through different big or small resistance through controlling different resistance switchs; Output on the external earphone horn through the Vw pin, thus the size of control volume;

Said button treatment circuit (101) comprises volume rising PU counting input end and volume decline PD counting input end, and said two inputs connect key switch (S1, S2) respectively; (PU) input port has shake removal function; Inside is connected to pull-up resistor, can keep the PU end to be high level at ordinary times, when PU end input low level; Internal counter begins execution and adds counting; After decoding circuit (102) decoding, the sliding unit of said resistance switch array (103) is moved up, the resistance between Vh and the Vw reduces, and volume increases; The PD input port has shake removal function; Inside is connected to pull-up resistor, can keep the PD end to be high level at ordinary times, when PD end input low level; Internal counter begins execution and subtracts counting; After decoding circuit (102) decoding, the sliding unit of said resistance switch array (103) is moved down, the resistance between Vh and the Vw increases, and volume reduces;

Said resistance switch array (103) comprises the resistance unit and the sliding unit of 8 series connection; Two end points in each unit all have can be by the tapping point of sliding unit visit; To data adding in button treatment circuit (101)/down counter counting that the visit of sliding unit tapping point position is imported by PU, two inputs of PD, realize through the electronic switch of control single contact after the decoder for decoding in the decoding circuit (102) then;

This circuit power is to utilize the dc reference level of mobile phone MIC pin as power supply; When electric circuit inspection when having button effectively to import; Earlier MIC output control switch (105) is broken off; When volume was regulated end, again with MIC output control switch (105) closure, string had the 3rd resistance (R3) to carry out current limliting between CMIC port and microphone;

Said power supply processing circuit (104) and the 3rd electric capacity (C3); First electric capacity (C1) is formed the negative supply voltage-multiplying circuit; Produce a negative supply at VEE end and supply with resistance switch array (103), guarantee audio signal through electric resistance array the amplitude and the distortion factor.