Tag Archives: microphone

MATRIX Voice: Open-Source Voice Recognition

MATRIX Voice is a”Voice Recognition” development board, designed for the Raspberry Pi or Stand-alone with ESP32 (WiFi/BT/MCU)

MATRIX Voice is an open-source VOICE RECOGNITION platform consisting of a 3.14-inches in diameter dev board, with a radial array of 7 MEMS microphones connected to a Xilinx Spartan6 FPGA & 64 Mbit SDRAM with 18 RGBW LED’s & 64 GPIO pins. Providing developers the opportunity to integrate custom voice & hardware-accelerated machine learning technology right onto the silicon. An ESP32 Wi-Fi / BT enabled 32 bit microcontroller version is available. It’s for makers, industrial and home IoT engineers.

The project is already funded on indiegogo.com and shipping begins next week.

Acusis – array microphone for speech recognition

An echo-canceling, far-field, linear array microphone for speech recognition and voice communications.

Acusis is a simple-to-use, complete solution for improving the audio quality for your speech recognition or video communications project. It solves multiple audio issues in a single device that mounts on a TV or monitor and hooks up to your Mac, PC, or single-board computer with standard USB protocols.

Acusis – array microphone for speech recognition – [Link]

Tiny Professional Microphone Preamplifier

The board has been design around INA217 low distortion, low noise instrumentation amplifier. The INA217 is ideal for low-level audio signals such as balanced low-impedance microphones. Many industrial, instrumentation, and medical applications also benefit from its low noise and wide bandwidth. Unique distortion cancellation circuitry reduces distortion to extremely low levels, even in high gain. The INA217 provides near-theoretical noise performance for 200Ω source impedance. The INA217 features differential input, low noise, and low distortion that provides superior performance in professional microphone amplifier applications. An OPA2137 op-amp used as a feedback to eliminate the offset voltage. Phantom power is not part of the circuit its just for reference.

Features

  • Supply Dual +/-15V DC
  • Output Unbalance Single Ended
  • PR1 Gain Adjust G=1+10000/Rg PR1

Tiny Professional Microphone Preamplifier – [Link]

Low noise Mini Electret Microphone PreAmplifier

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The single supply microphone pre-amplifier amplifies the output signal of an electret capsule microphone to audio line levels. An op amp is used as a trans-impedance amplifier to convert the output current from the microphone in to a signal level voltage. The circuit works with 9V so it is good choice for battery operated systems.

Features

  • Supply 9V DC
  • Current Approx. 3mA
  • On Board Microphone
  • Very thin and narrow PCB

Low noise Mini Electret Microphone PreAmplifier – [Link]

Voice Changer

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Voice Changer project can be used to transpose or distort one’s voice by encoding the sound appearing at the Microphone input. This project is built around AP8072 IC.

Specifications

  • Supply input : 6 VDC @ 200 mA
  • Output : Speaker, 8 Ω / 0.5 W
  • Audio amplifier type LM386 with volume control preset
  • Jumper selectable tone frequency for encoding sound
  • 4 Tones to choose
  • Built in noise reduction circuit for reducing environment noise
  • On/Off Jumper connector for power supply input
  • Berg connector for power supply input and speaker output
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 48 mm x 52 mm

Voice Changer – [Link]

Tiny Mic Preamplifier

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The Tiny Mic Preamplifier based is based on a single transistor amplifier design. It amplifies the output of the electret condenser microphone. Good choice for Karaoke.

Specifications

  • Power supply: 5 ~ 9 VDC @ 2 mA
  • Provides standard audio signal
  • PCB dimensions 26 mm x 56 mm

Tiny Mic Preamplifier – [Link]

KaraOkay Microphone Amplifier

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Here is an all-analog, all-through-hole, cheap & cheerful preamplifier for that perennial problem of getting the microphone amplification just right, which is a challenge not only with the faithful reproduction of lead vocals during concerts and recordings, but also with campfire and karaoke-ish performances specially when the beer takes hold.

KaraOkay Microphone Amplifier – [Link]