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Microphone (MIC) switching circuit of vehicle-mounted multimedia terminal

A vehicle-mounted multimedia and switching circuit technology, applied in the field of MIC switching circuits, can solve problems such as complex process, CPU occupation, and impact on sound signal quality, and achieve good performance and cost reduction.

Inactive Publication Date: 2016-12-14
FUJIAN XINGHAI COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method is to connect the MIC sound input to the main control CPU, and the CPU collects the sound signal of the MIC through the ADC. When 3G or Bluetooth needs sound input, the CPU converts the collected signal through the DAC. The disadvantage of this technology: the whole process The CPU must be involved, occupying CPU resources, and requires software participation, the process is complicated, and because of the analog-to-digital conversion and digital-to-analog conversion, it has a certain impact on the quality of the sound signal

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  • Microphone (MIC) switching circuit of vehicle-mounted multimedia terminal

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specific Embodiment approach

[0022] Such as figure 1 As shown, a specific embodiment of the present invention: the circuit consists of two 74HC4052D analog switches, a built-in microphone and an external microphone. 1. When the built-in MIC (CN6) needs to be connected, by pulling down the 10-pin AS0 (MICSEL3) of the U834, the strobe 12-pin 1Y0 (MICN_IN1) is connected to the 13-pin 1Z (MICN_IN), and the 1-pin 2Y0 (MICP_IN1) is connected to the 3-pin 2Z(MICP_IN). Thus, the signals MICN_IN1 and MICP_IN1 of CN6 are transmitted to the 13-pin 1Z (MICN_IN) and the 3-pin 2Z (MICP_IN) of U833. When an external MIC (CN5) is needed, pull up the 10-pin AS0 of U834. Gate 14-pin 1Y1 (MICN_IN_OSide) to 13-pin 1Z (MICN_IN), 5-pin 2Y1 (MICP_IN_OSide) to 3-pin 2Z (MICP_IN). Thus, the signals MICN_IN_Oside and MICP_IN_Oside of CN5 are transmitted to pin 3 2Z (MICP_IN) and pin 13 1Z (MICN_IN) of U833 respectively. 2. When it is necessary to switch the MIC to the 3G module to realize the 3G function, by pulling down pin 9...

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Abstract

The invention provides a microphone (MIC) switching circuit of a vehicle-mounted multimedia terminal. The MIC switching circuit is used for being connected with the vehicle-mounted multimedia terminal, and is characterized by comprising a first analog toggle switch, a second analog toggle switch and a MIC module, wherein the vehicle-mounted multimedia terminal is respectively connected with the first analog toggle switch and the second analog toggle switch, the first analog toggle switch is connected with the second analog switch, and the second analog switch is connected with the MIC module. According to the circuit of the invention, the cost is reduced, reliability of the circuit is improved, and the complexity of the circuit is reduced.

Description

technical field [0001] The invention relates to a switching circuit, in particular to a MIC switching circuit of a vehicle-mounted multimedia terminal. Background technique [0002] The vehicle multimedia terminal requires the realization of the Bluetooth phone function; at the same time, it must have the recording function; A built-in microphone (MIC) input; this requires that when the vehicle-mounted multimedia terminal starts different functions (Bluetooth phone function / recording function / 3G phone function), the MIC input needs to be connected to different places. [0003] On the microphone (MIC) input of the vehicle-mounted multimedia terminal with functions such as Bluetooth and 3G, when the Bluetooth is working, the MIC sound signal needs to be input to the Bluetooth module; when the 3G module is working, the MIC sound signal needs to be input to the 3G module; when the multimedia terminal starts the recording function, it needs to input the MIC sound signal to the m...

Claims

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Application Information

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IPC IPC(8): H04R3/00
CPCH04R3/00H04R2430/00
Inventor 洪炳林张代详江正锈陈星辉陈永良
Owner FUJIAN XINGHAI COMM TECH