Audio switching control circuit

Abstract

The utility model relates to an audio switching control circuit, which comprises an audio control chip, a first analog switch and a second analog switch, an audio output port of the audio control chip is connected with an audio input port of the first analog switch; a playing control port of the audio control chip is connected with a first input control port of the first analog switch; a Wiegand control port of the audio control chip is connected with a second input control port of the second analog switch; a first audio output port of the first analog switch is connected with first audio playing equipment through a power amplifier unit; a second audio output port of the first analog switch is connected with a second input control port of the second analog switch through the operational amplifier unit; the output port of the second analog switch is connected with a second audio playing device. According to the scheme, multifunctional switching among internal audio, external equipment audio and Wiegand output is realized, and the structure of the control circuit is simplified.

Description

Technical Field

[0001] This utility model relates to the field of audio control technology, specifically to an audio switching control circuit. Background Technology

[0002] With the technological advancements in access control equipment, more functions have been implemented; for example, multi-party calls or video calls can be conducted. However, the increase in functionality has also increased the size of the external output sockets, the number of wiring harnesses, and made the circuit structure more complex.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] This invention provides an audio switching control circuit that can effectively overcome the defects existing in the prior art.

[0005] Other features and advantages of this invention will become apparent from the following detailed description, or may be learned in part by practice of this disclosure.

[0006] According to a first aspect of the present invention, an audio switching control circuit is provided, comprising: an audio control chip, a first analog switch, and a second analog switch;

[0007] The audio output port of the audio control chip is connected to the audio input port of the first analog switch; the playback control port of the audio control chip is connected to the first input control port of the first analog switch; and the Wiegand control port of the audio control chip is connected to the second input control port of the second analog switch.

[0008] The first audio output port of the first analog switch is connected to the first audio playback device through a power amplifier unit; the second audio output port of the first analog switch is connected to the second input control port of the second analog switch through an operational amplifier unit; and the output port of the second analog switch is connected to the second audio playback device.

[0009] In some exemplary embodiments, the enable control port of the audio control chip is connected to the power amplifier unit.

[0010] In some exemplary embodiments, the playback control port of the audio control chip is connected to the first input control port of the first analog switch and the first input control port of the second analog switch, respectively.

[0011] In some exemplary embodiments, when the playback control port of the audio control chip outputs a high-level signal, it controls the first analog switch to play audio data using the first audio playback device; or

[0012] When the playback control port of the audio control chip outputs a low-level signal, the first analog switch controls the second analog switch to play audio data using the second audio playback device.

[0013] In some exemplary embodiments, a coupling filter circuit is provided between the first analog switch and the operational amplifier unit.

[0014] In some exemplary embodiments, the input terminal of the operational amplifier unit is connected to a voltage divider circuit and a filter circuit.

[0015] The audio switching control circuit provided in this embodiment connects the audio output port of the audio control chip to the audio input port of the first analog switch, and the playback control port to the first input control port of the first analog switch; the Wiegand control port is connected to the second input control port of the second analog switch; the first audio output port of the first analog switch is connected to the first audio playback device through a power amplifier unit; the second audio output port of the first analog switch is connected to the second input control port of the second analog switch through an operational amplifier unit; and the output port of the second analog switch is connected to a second audio playback device. This allows the audio control chip to control the switching of the two analog switches by switching high / low levels, thereby achieving multi-functional switching between internal audio, external device audio, and Wiegand output. Furthermore, it simplifies the structure of the control circuit, facilitating the realization of multiple functions in a single access control panel.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0018] Figure 1 This diagram schematically illustrates the module composition of an audio switching control circuit in an exemplary embodiment of the present invention.

[0019] Figure 2 The schematic diagram illustrates an audio switching control circuit according to an exemplary embodiment of the present invention;

[0020] Figure 3 The schematic diagram illustrates the principle of an audio switching control circuit according to an exemplary embodiment of the present invention.

[0021] Figure 4 The schematic diagram illustrates the power supply principle of a power amplifier unit in an exemplary embodiment of the present invention. Detailed Implementation

[0022] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0023] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore, repeated descriptions of them will be omitted.

[0024] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be understood that in the disclosure of the present invention, the terms “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention. Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," and "coupling," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] To address the shortcomings and deficiencies of existing technologies, this exemplary embodiment provides an audio switching control circuit, referencing... Figure 1As shown, the system includes: an audio control chip 11, a first analog switch 12, a second analog switch 16, a power amplifier unit 13, an operational amplifier unit 17, a first audio playback device 14, and a second audio playback device 15. The audio output port of the audio control chip 11 is connected to the audio input port of the first analog switch 12; the playback control port of the audio control chip 11 is connected to the first input control ports of both the first analog switch 11 and the second analog switch 16. The Wiegand control port of the audio control chip 11 is connected to the second input control port of the second analog switch 16. The first audio output port of the first analog switch 12 is connected to the first audio playback device 14 via the power amplifier unit 13; the second audio output port of the first analog switch 12 is connected to the second input control port of the second analog switch 16 via the operational amplifier unit 17; and the output port of the second analog switch 16 is connected to the second audio playback device 15.

[0026] For example, the audio control chip can be a System-on-a-Chip (SoC) chip used for audio control. For instance, the audio control chip can be a Hi3516 chip. Of course, in other exemplary embodiments of this disclosure, other types of control chips can also be used.

[0027] refer to Figure 2 As shown, the CODEC port of the audio control chip SOC is connected to the COM ports (COM1 and COM2 ports) of the first analog switch SW1, used to send the left and right channel audio signals (HPL_OUT and HPR_OUT signals) to the first analog switch SW1. The GPIO port of the audio control chip SOC is connected to the first input control port of the first analog switch SW1, used to output the SPK_SW signal (high / low level signal) to the first analog switch SW1. Furthermore, the GPIO port of the audio control chip SOC can also be connected to the first input control port of the second analog switch SW2, used to output the SPK_SW signal to the second analog switch SW2. Another GPIO port of the audio control chip SOC is connected to the power amplifier unit PA, used to output an enable signal (PA_EN signal) to the power amplifier unit PA. Additionally, the WG port of the audio control chip SOC is connected to the A1 port of the second analog switch SW2, used to send the Wiegand output signal (WGOUT_D1 signal) to the second analog switch SW2. The first and second analog switches can be used as control switches for the audio signals.

[0028] For example, the first analog switch SW1 is connected to the power amplifier unit PA through the NO port (NO1 port, NO2 port) and outputs audio signals (HPL_OUT_H signal, HPR_OUT_H signal) to the power amplifier unit PA; the output terminal of the power amplifier unit PA is connected to the speaker.

[0029] The NC ports (NC1 and NC2 ports) of the first analog switch SW1 are connected to the operational amplifier unit OA, outputting HPL_OUT_L and HPR_OUT_L signals to OA. The output of operational amplifier unit OA is connected to the A2 port of the second analog switch SW2, sending HPL_OUT_L and HPR_OUT_L signals. The output port (B port) of the second analog switch SW2 sends audio signals (HPL&R_OUT_L signals) or Wiegand signals (WGOUT_D0 signals) to the connected second audio playback device.

[0030] For example, refer to Figure 3 As shown, switch U1 is the first analog switch, and its fourth port (IN1 port) is connected to the GPIO port of the SOC chip to receive the SPK_SW signal; in addition, the fourth port is connected to the ground terminal after being connected in series with resistor R2.

[0031] For example, operational amplifier U2 can be an internal operational amplifier unit (Audio OA). A coupling filter circuit can also be provided between the NC1 and NC2 ports of switch U1 and the input port (fourth port, IN-) of operational amplifier U2 for signal coupling and filtering. Specifically, the coupling filter circuit can include: capacitors (C2, C3, C4, C5, C8) and resistors (R3, R4); wherein, the first end of capacitor C2 is connected to the NC2 port of operational amplifier U2; the second end of capacitor C2 is connected to the second end of capacitor C3, the first end of resistor R3, the first end of capacitor C4, and the first end of capacitor C5; the first end of capacitor C3 is connected to the NC1 port of operational amplifier U2; the second ends of resistor R3 and capacitor C4 are respectively connected to ground; the second end of capacitor C5 is connected to the first end of resistor R4; the second end of resistor R4 is connected to the fourth port of operational amplifier U2 and the first end of capacitor C8; the second end of capacitor C8 is connected to ground.

[0032] For example, the third port (IN+) of operational amplifier U2 is connected in series with the first filter circuit and the voltage divider circuit, and then connected to the power supply terminal (VCC_5V). The first filter circuit includes capacitors C6 and C7; the third port (IN+) of operational amplifier U2 is connected to the first terminals of capacitors C6 and C7, respectively, and the second terminals of capacitors C6 and C7 are connected to ground. The voltage divider circuit includes resistors R5 and R6; the first terminal of resistor R5 is connected to the power supply terminal, and the second terminal of resistor R5 is connected to the first terminals of resistor R6 and capacitor C6; the second terminal of resistor R6 is connected to ground.

[0033] For example, the fifth port (+VS) of operational amplifier U2 is connected to the power supply terminal (VCC_5V) through a second filter circuit. The second filter circuit includes capacitors (C10, C11, C12) connected in parallel. The first end of each capacitor is connected to the fifth port of operational amplifier U2 and the power supply terminal (VCC_5V), respectively, and the second end of each capacitor is connected to the ground terminal.

[0034] For example, refer to Figure 3 As shown, switch U3 is the second analog switch. The first port (A1) of switch U3 is used to receive the WG_OUT signal; the third port (A2) of switch U3 is connected to the output terminal (first port, OUT) of operational amplifier U2; the fourth port (B) of switch U3 is connected to the second audio playback device; the fifth port of switch U3 is connected to the power supply terminal (VCC_5V) and the first terminal of capacitor C13, and the second terminal of capacitor C13 is connected to the ground terminal. The sixth port (ENB) of switch U3 has an eighth resistor R8 connected in series, used to receive the SPK_SW signal.

[0035] For example, refer to Figure 4 As shown, power amplifier U4, acting as a power amplifier unit, has its first port (SHDN#) used to receive the enable signal (PA_EN). This first port is connected to the second terminal of resistor R9 and the first terminal of resistor R10. The first terminal of resistor R9 is connected to the GPIO port of the audio control chip SOC; the second terminal of resistor R10 is connected to ground. The second port (BYPASS) of power amplifier U4 is connected to the first terminal of capacitor C16, and the second terminal of capacitor C16 is connected to ground. The third port (IN+) of power amplifier U4 has resistor R11 and capacitor C14 connected in series; the fourth port (IN-) has resistor R12 and capacitor C15 connected in series. The fifth port (VO1) and sixth port (VO2) of power amplifier U4 are connected to a filter circuit, which in turn connects to the speaker. The filter circuit may include capacitors (C18, C19, C20).

[0036] For example, when controlling the internal speaker and Wiegand output, the audio control chip SOC controls its GPIO signal SPK_SW to be high, controlling the first analog switch SW1 to switch the HPL_OUT and HPR_OUT of the SOC's integrated codec to the device's internal Audio PA. Simultaneously, the Wiegand output is output through the second analog switch SW2. When voice playback is required, the SOC enables audio output by pulling its GPIO signal PA_EN high. Audio output from the SOC's integrated codec is switched to the internal speaker output via the first analog switch SW1 and the power amplifier unit Audio PA, while the Wiegand output function remains operational.

[0037] When controlling the external speaker output, the audio control chip SOC controls its GPIO signal SPK_SW to a low level, controlling the first analog switch SW1 to switch the HPL_OUT and HPR_OUT of the SOC's integrated codec to the device's internal AudioOA. Audio OA raises the DC bias of the output audio to half of VCC (5V), and simultaneously amplifies the output HPL_OUT and HPR_OUT. Then, the audio is switched to an external power amplifier via the second analog switch SW2. The audio output from the SOC's integrated codec passes through the first analog switch SW1, the operational amplifier unit Audio OA, and the second analog switch SW2 before being output to the external power amplifier. At this time, the Wiegand output is disabled.

[0038] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0039] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An audio switching control circuit, characterized in that, include: Audio control chip, first analog switch, second analog switch; The audio output port of the audio control chip is connected to the audio input port of the first analog switch; The playback control port of the audio control chip is connected to the first input control port of the first analog switch; the Wiegand control port of the audio control chip is connected to the second input control port of the second analog switch. The first audio output port of the first analog switch is connected to the first audio playback device via a power amplifier unit; the second audio output port of the first analog switch is connected to the second analog switch via an operational amplifier unit. The second input control port of the analog switch is connected; the output port of the second analog switch is connected to a second audio playback device.

2. The audio switching control circuit according to claim 1, characterized in that, The enable control port of the audio control chip is connected to the power amplifier unit.

3. The audio switching control circuit according to claim 1, characterized in that, The playback control port of the audio control chip is connected to the first input control port of the first analog switch and the first input control port of the second analog switch, respectively.

4. The audio switching control circuit according to claim 1, characterized in that, When the playback control port of the audio control chip outputs a high-level signal, it controls the first analog switch to play audio data using the first audio playback device; or When the playback control port of the audio control chip outputs a low-level signal, the first analog switch controls the second analog switch to play audio data using the second audio playback device.

5. The audio switching control circuit according to claim 1, characterized in that, A coupling filter circuit is provided between the first analog switch and the operational amplifier unit.

6. The audio switching control circuit according to claim 1 or 5, characterized in that, The input terminal of the operational amplifier unit is connected to a voltage divider circuit and a filter circuit.

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