CN210986405U

CN210986405U - Audio switching circuit

Info

Publication number: CN210986405U
Application number: CN202020336312.0U
Authority: CN
Inventors: 齐志敏; 耿江帅; 宋萌萌; 张雪青
Original assignee: Shijiazhuang New Ways Technologies Co ltd
Current assignee: Shijiazhuang light intellectual property agency consulting Co.,Ltd.
Priority date: 2020-03-17
Filing date: 2020-03-17
Publication date: 2020-07-10
Anticipated expiration: 2030-03-17

Abstract

The utility model discloses an audio frequency switching circuit relates to signal processing circuit technical field. The switching circuit comprises a power supply module, a first sound source input circuit, a second sound source input and switching circuit and a sound source signal processing and output circuit, wherein the input end of the first sound source input circuit is connected with a trainman broadcasting signal, the output end of the first sound source input circuit is connected with the switching signal input end of the second sound source input and switching circuit, the input end of the second sound source input and switching circuit is connected with a multimedia sound source, the output end of the second sound source input and switching circuit is connected with the signal input end of the sound source signal processing and output circuit, and the output end of the sound source signal processing and output circuit is the audio signal output end of the switching circuit. The switching circuit can realize the switching of two sound sources, and reduces the complexity and the cost of the system.

Description

Audio switching circuit

Technical Field

The utility model relates to a signal processing circuit technical field especially relates to an audio frequency switching circuit.

Background

In the existing passenger train system, different sound sources are respectively subjected to data transmission through different control devices and are respectively controlled in the process of on-off control. And it need be wired respectively in the in-process of installation for audio system's structure is comparatively complicated, and has increased certain cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem how to provide a switching that can realize two kinds of sound sources, audio frequency switching circuit of reduction system complexity and cost.

In order to solve the technical problem, the utility model discloses the technical scheme who takes is: an audio switching circuit, comprising: including power module, first sound source input circuit, second sound source input and switching circuit and sound source signal processing and output circuit, first sound source input circuit's input termination trainman broadcast signal, first sound source input circuit's output with second sound source input and switching circuit's switching signal input part is connected, second sound source input and switching circuit's input termination multimedia sound source, second sound source input and switching circuit's output with sound source signal processing and output circuit's signal input part connects, sound source signal processing and output circuit's output does switching circuit's audio signal output part.

The power module comprises a power input connector J1, wherein a pin 1 and a pin 2 of J1 are power input ends, the pin 1 and the pin 2 of J1 are connected with the anode of a diode D3 through a fuse F1, the cathode of a diode D3 is divided into five paths, the first path is connected with a +24V power supply, the second path is grounded through a capacitor C1, the third path is grounded through a capacitor E1, the fourth path is connected with a pin 3 of a L M317BT type power chip U2, the fifth path is connected with the cathode of a diode D4, the pin 1 of U2 is divided into two paths, the first path is grounded through a resistor R6, the second path is connected with the output end of U2 through a resistor R7, the anode of the diode D2 is connected with the output end of the U2, the output end of the U2 is divided into four paths, the first path is grounded through a capacitor E2, the second path is grounded through a capacitor C2, the third path is grounded through a resistor R8, the anode of the LED 1, and the output end of the power module ED L is an ED L.

The further technical scheme is as follows: first sound source input circuit includes connector J2, 3 feet and 4 feet ground connection of J2, J2's 1 foot and 2 feet are divided into two the tunnel, and first way is through potentiometre RV1 ground connection, and the second way is connected with transformer T1 elementary one end, the elementary other end ground connection of T1, the one end ground connection of T1 secondary, the other end of T1 secondary divide into two the tunnel behind resistance R1, and first way is through resistance R2 ground connection, and the second way is the signal output part of first sound source input circuit.

The further technical scheme is as follows: the second sound source input and switching circuit comprises a connector J5, wherein a pin 1 of the J5 is grounded, a pin 1 of the J5 is divided into three paths, the first path is grounded through a potentiometer RV2, the second path is grounded through a resistor R3, the third path is connected with a pin 10 of a normally closed contact of a TX 2-24V-type relay K1, a pin 3 of the J5 is divided into three paths, the first path is grounded through the potentiometer RV3, the second path is grounded through a resistor R4, the third path is connected with a pin 3 of the normally closed contact of the TX 2-24V-type relay K1, and a pin 4 of the J5 is suspended; the output end of the first sound source input circuit is divided into two paths, the first path is connected with the 8 th pin of the K1 normally open contact, the second path is connected with the 5 th pin of the K1 normally open contact, and the 9 th pin of the common contact and the 4 th pin of the common contact in the K1 are two output ends of the second sound source input and switching circuit; the 1 foot of relay K1's coil is divided into two the way, and the first way is connected with diode D1's negative pole, and the second way connects +24V power through resistance R5, the 12 feet of relay K1's coil is divided into two the way, and the first way is connected with diode D1's positive pole, and the second way is connected with the 1 foot that connects grafting J4 through diode D2, connects the 2 feet that connect J4 and earths.

One input end of the sound source signal processing and outputting circuit is divided into two paths, the first path is grounded through a resistor R9 and a capacitor C3 in sequence, the second path is connected with the inverting input end of a PT2308-S type power amplifier U1A through a capacitor E3 and a resistor R10 in sequence, the inverting input end of the U1A is connected with the output end of the U1A through a resistor R13, the non-inverting input end of the U1A is divided into three paths, the first path is connected with the output end of a power supply module through a resistor R12, the second path is grounded through a resistor R11, the third path is connected with the non-inverting input end of the PT2308-S type power amplifier U1B, the output end of the U1A is divided into two paths, the first path is grounded through a capacitor C4, the second path is connected with one end of a capacitor E4, the other end of the E4 is divided into two paths, the first path is grounded through a resistor R14, and the second path is connected with a;

the other input end of the sound source signal processing and outputting circuit is divided into two paths, the first path is sequentially grounded through a resistor R15 and a capacitor C5, the second path is sequentially connected with the inverting input end of a PT2308-S type power amplifier U1B through a capacitor E5 and a resistor R16, the inverting input end of the U1B is connected with the output end of the U1B through a resistor R17, the output end of the U1B is divided into two paths, the first path is grounded through a capacitor C6, the second path is connected with one end of the capacitor E6, the other end of the E6 is divided into two paths, the first path is grounded through a resistor R18, the second path is connected with a 4 pin of a connector J3 through an inductor L2, and the 3 pin and the 4 pin of the connector J3 are two signal output ends of the sound source signal processing and outputting circuit.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the switching circuit is a part of a passenger information system of a motor train unit train and is used for switching the audio of the commercial seat passengers to a trainee broadcasting channel when the trainee broadcasts the whole train. At the broadcast time of non-train, the passengers select the radio sound source or other video playing source. The circuit can realize the switching of two sound source signals, and has low system complexity and cost.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic block diagram of a switching circuit according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a power module in the switching circuit according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a first audio input circuit in the switching circuit according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a second sound source input and switching circuit in the switching circuit according to an embodiment of the present invention;

fig. 5 is a schematic diagram of an audio signal processing and output circuit in the switching circuit according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

As shown in fig. 1, an embodiment of the present invention discloses an audio switching circuit, which includes a power module, a first audio input circuit, a second audio input and switching circuit, and an audio signal processing and output circuit. The input end of the first sound source input circuit is connected with a trainman broadcasting signal, the output end of the first sound source input circuit is connected with the switching signal input end of the second sound source input and switching circuit, the input end of the second sound source input and switching circuit is connected with a multimedia sound source, the output end of the second sound source input and switching circuit is connected with the signal input end of the sound source signal processing and output circuit, and the output end of the sound source signal processing and output circuit is the audio signal output end of the switching circuit.

As shown in fig. 2, the power module includes a power input connector J1,

pins

1 and 2 of the J1 are power input terminals,

pins

1 and 2 of the J1 are connected to an anode of a diode D3 through a fuse F1, a cathode of the diode D3 is divided into five paths, the first path is connected to a +24V power source, the second path is grounded through a capacitor C1, the third path is grounded through a capacitor E1, the fourth path is connected to a pin 3 of a L M317BT power chip U2, the fifth path is connected to a cathode of a diode D4, the pin 1 of the U2 is divided into two paths, the first path is grounded through a resistor R6, the second path is connected to an output terminal of the U2 through a resistor R7, an anode of the diode D2 is connected to an output terminal of the U2, an output terminal of the U2 is divided into four paths, the first path is grounded through a capacitor E2, the second path is grounded through a capacitor C2, the third path is sequentially connected to an R8, and a light emitting diode R8227 is connected to an output terminal of the power module 86.

As shown in fig. 3, the first audio source input circuit includes a connector J2,

pins

3 and 4 of the J2 are grounded,

pins

1 and 2 of the J2 are divided into two paths, the first path is grounded through a potentiometer RV1, the second path is connected to one primary end of a transformer T1, the other primary end of the T1 is grounded, one secondary end of the T1 is grounded, the other secondary end of the T1 is divided into two paths through a resistor R1, the first path is grounded through a resistor R2, and the second path is a signal output end of the first audio source input circuit.

As shown in fig. 4, the second sound source input and switching circuit includes a connector J5, where the pin 1 of the J5 is grounded, the pin 1 of the J5 is divided into three paths, the first path is grounded through a potentiometer RV2, the second path is grounded through a resistor R3, the third path is connected to the 10 th pin of the normally closed contact of the TX 2-24V-type relay K1, the pin 3 of the J5 is divided into three paths, the first path is grounded through the potentiometer RV3, the second path is grounded through a resistor R4, the third path is connected to the 3 rd pin of the normally closed contact of the TX 2-24V-type relay K1, and the pin 4 of the J5 is suspended; the output end of the first sound source input circuit is divided into two paths, the first path is connected with the 8 th pin of the K1 normally open contact, the second path is connected with the 5 th pin of the K1 normally open contact, and the 9 th pin of the common contact and the 4 th pin of the common contact in the K1 are two output ends of the second sound source input and switching circuit; the 1 foot of relay K1's coil is divided into two the way, and the first way is connected with diode D1's negative pole, and the second way connects +24V power through resistance R5, the 12 feet of relay K1's coil is divided into two the way, and the first way is connected with diode D1's positive pole, and the second way is connected with the 1 foot that connects grafting J4 through diode D2, connects the 2 feet that connect J4 and earths.

As shown in fig. 5, an input end of the sound source signal processing and outputting circuit is divided into two paths, the first path is grounded through a resistor R9 and a capacitor C3 in sequence, the second path is connected with an inverting input end of a PT2308-S type power amplifier U1A through a capacitor E3 and a resistor R10 in sequence, the inverting input end of the U1A is connected with an output end of the U1A through a resistor R13, a non-inverting input end of the U1A is divided into three paths, the first path is connected with an output end of a power module through a resistor R12, the second path is grounded through a resistor R11, the third path is connected with a non-inverting input end of a PT2308-S type power amplifier U1B, an output end of the U1A is divided into two paths, the first path is grounded through a capacitor C4, the second path is connected with one end of a capacitor E4, the other end of the E4 is divided into two paths, the first path is grounded through a resistor R14;

Firstly, the preparation work comprises the following steps:

1) the 24V switching power supply is connected with the J1 connector;

2) the 2-line plug of the sound source input line is inserted into the J2 connector, and the 3.5mm plug is inserted into the mobile phone;

3) the audio output line is connected with J3 and an earphone;

4) the mobile phone plays the audio file, and the volume is adjusted to the maximum.

Second, checking the power supply voltage

1) Measuring the voltage of the capacitor C2 at a DC 6V gear;

2) the voltage is stable.

Three, J2 sound source detection

1) The volume of the mobile phone is adjusted to 100%, and J3 has no output;

2) two pins of the J4 are short-circuited, the click relay can be heard, and the J3 outputs sound;

3) the two pins of the J4 are disconnected, the click relay is heard to be disconnected, and no output is required to be output from the J3;

four, J5 sound source detection

1) The J2 connector is pulled off, and the plug with 3 wires is inserted on the J5;

2) the volume of the mobile phone is adjusted to 10%, and J3 should be output;

3) the two pins of the J4 are short-circuited, the click relay can be heard, and no sound is output by the J3;

4) two pins of the J4 are disconnected, the click relay can be heard to be disconnected, and the J3 should output;

the switching circuit is a part of a passenger information system of a motor train unit train and is used for switching the audio of the commercial seat passengers to a trainee broadcasting channel when the trainee broadcasts the whole train. At the broadcast time of non-train, the passengers select the radio sound source or other video playing source. The circuit can realize the switching of two sound source signals, and has low system complexity and cost.

Claims

1. An audio switching circuit, comprising: including power module, first sound source input circuit, second sound source input and switching circuit and sound source signal processing and output circuit, first sound source input circuit's input termination trainman broadcast signal, first sound source input circuit's output with second sound source input and switching circuit's switching signal input part is connected, second sound source input and switching circuit's input termination multimedia sound source, second sound source input and switching circuit's output with sound source signal processing and output circuit's signal input part connects, sound source signal processing and output circuit's output does switching circuit's audio signal output part.

2. The audio switching circuit according to claim 1, wherein the power module comprises a power input connector J1, pins 1 and 2 of the J1 are power input terminals, pins 1 and 2 of the J1 are connected to an anode of a diode D3 through a fuse F1, a cathode of the diode D3 is divided into five paths, the first path is connected to a +24V power source, the second path is connected to a ground through a capacitor C1, the third path is connected to a ground through a capacitor E1, the fourth path is connected to a pin 3 of a L M317 model BT power chip U2, the fifth path is connected to a cathode of a diode D4, pin 1 of the U2 is divided into two paths, the first path is connected to a ground through a resistor R6, the second path is connected to an output terminal of the U2 through a resistor R7, an anode of the diode D2 is connected to an output terminal of the U2, an output terminal of the U2 is divided into four paths, the first path is connected to a ground through a capacitor E2, the first path is connected to a ground through a capacitor C2, the third path is connected to a resistor R828653, and the output terminal of the power module is connected.

3. The audio switching circuit of claim 1, wherein: first sound source input circuit includes connector J2, 3 feet and 4 feet ground connection of J2, J2's 1 foot and 2 feet are divided into two the tunnel, and first way is through potentiometre RV1 ground connection, and the second way is connected with transformer T1 elementary one end, the elementary other end ground connection of T1, the one end ground connection of T1 secondary, the other end of T1 secondary divide into two the tunnel behind resistance R1, and first way is through resistance R2 ground connection, and the second way is the signal output part of first sound source input circuit.

4. The audio switching circuit of claim 1, wherein: the second sound source input and switching circuit comprises a connector J5, wherein a pin 1 of the J5 is grounded, a pin 1 of the J5 is divided into three paths, the first path is grounded through a potentiometer RV2, the second path is grounded through a resistor R3, the third path is connected with a pin 10 of a normally closed contact of a TX 2-24V-type relay K1, a pin 3 of the J5 is divided into three paths, the first path is grounded through the potentiometer RV3, the second path is grounded through a resistor R4, the third path is connected with a pin 3 of the normally closed contact of the TX 2-24V-type relay K1, and a pin 4 of the J5 is suspended; the output end of the first sound source input circuit is divided into two paths, the first path is connected with the 8 th pin of the K1 normally open contact, the second path is connected with the 5 th pin of the K1 normally open contact, and the 9 th pin of the common contact and the 4 th pin of the common contact in the K1 are two output ends of the second sound source input and switching circuit; the 1 foot of relay K1's coil is divided into two the way, and the first way is connected with diode D1's negative pole, and the second way connects +24V power through resistance R5, the 12 feet of relay K1's coil is divided into two the way, and the first way is connected with diode D1's positive pole, and the second way is connected with the 1 foot that connects grafting J4 through diode D2, connects the 2 feet that connect J4 and earths.

5. The audio frequency switching circuit according to claim 1, wherein an input terminal of said audio signal processing and outputting circuit is divided into two paths, the first path is grounded through a resistor R9 and a capacitor C3 in turn, the second path is connected with an inverting input terminal of a PT2308-S type power amplifier U1A through a capacitor E3 and a resistor R10 in turn, an inverting input terminal of said U1A is connected with an output terminal of said U1A through a resistor R13, a non-inverting input terminal of said U1A is divided into three paths, the first path is connected with an output terminal of a power module through a resistor R12, the second path is grounded through a resistor R11, the third path is connected with a non-inverting input terminal of a PT2308-S type power amplifier U1B, an output terminal of said U1A is divided into two paths, the first path is grounded through a capacitor C4, the second path is connected with one end of a capacitor E4, the other end of said E4 is divided into two paths, the first path is grounded through a resistor R14, and the first path is connected;