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Analysis of Key Parameters and Selection Guide for Voice Chips - Taking KT148A and KT142C as Examples
In the acoustic design of electronic devices, the performance of voice chips plays a decisive role in the sound performance of products. From the reverse prompts of cars, the fault alarms of industrial equipment to the interactive sound effects of children's toys, for engineers to select the right voice chip, they must clearly understand the matching logic between core sound - quality parameters and application scenarios. This article will systematically analyze the key parameters of voice chips, and taking KT148A and KT142C voice chips as examples, provide detailed selection guidance based on their specific characteristics.
Detailed Explanation of Core Sound - quality Parameters of Voice Chips
The sound quality of voice chips is determined by a series of technical parameters, which are directly related to the reduction, clarity, and applicability of sound.
1.Sampling Rate (Hz)
The number of times the sound signal is collected per second, which determines the accuracy of restoring the original sound. Common specifications include 44.1kHz, 48kHz, 96kHz, and 192kHz. The higher the sampling rate, the richer the sound details, but the data volume increases accordingly, occupying more storage and transmission resources. For example, a 96kHz sampling rate can capture the subtle changes in the overtones of musical instruments, while 44.1kHz can meet the clarity requirements of most voice - interaction scenarios.
The KT148A chip supports sampling rates of 8KHz and 16KHz, which is sufficient for general voice prompts and alarm applications.
The KT142C chip supports a wider range of sampling rates, including 8/11.025/12/16/22.05/24/32kHz, making it more suitable for scenarios with high - quality audio requirements.
2.Resolution (bit)
Also known as bit - depth, it represents the quantization accuracy of each sampling point. Commonly, it is 16bit and 24bit. A higher resolution (such as 24bit) can more accurately describe the amplitude changes of sound, bringing a wider dynamic range and a stronger sense of hierarchy. In professional recording equipment, 24 - bit resolution can present the complete transition from soft to loud sounds in a concert, while 16 - bit is sufficient to meet the clarity requirements of ordinary voice prompts (such as electronic doorbells).
The KT148A uses 16 - bit PWM output to ensure clear sound reproduction in its intended applications.
The KT142C features a 24 - bit DAC output, providing a 90dB dynamic range and an 85dB signal - to - noise ratio, making it suitable for scenarios with high - quality sound requirements.
3.Signal - to - Noise Ratio (S/N, dB)
The ratio of the effective signal to the noise, which directly reflects the purity of the sound. The higher the value, the less noise interference. Industrial - grade chips usually require a signal - to - noise ratio of over 85dB to ensure that alarms can be clearly transmitted in machine noise; for consumer products such as children's toys, 60 - 70dB can meet basic needs. The signal - to - noise ratio of high - end vehicle - mounted chips can reach over 100dB, maintaining the clarity of voice commands in engine noise.
The KT142C chip has an 85dB signal - to - noise ratio, ensuring high - quality audio output.
The KT148A meets the requirements of general - purpose applications with its appropriate noise performance.
4.Dynamic Range (dB)
The difference between the maximum and minimum signals that the chip can handle, which determines the ability to express changes in sound intensity. Equipment for playing classical music requires a dynamic range of over 100dB to restore the grand ups and downs of symphonies, while an elevator arrival prompt only needs 50 - 60dB to clearly convey information.
With a 90dB dynamic range, the KT142C chip can handle audio with large volume variations, making it suitable for complex audio playback.
The KT148A, with its inherent dynamic range, is suitable for simple voice prompts and alarms.
5.Total Harmonic Distortion (THD, %)
Measures the degree of distortion during signal amplification. The lower the value, the better. The THD of Hi - Fi audio chips can be as low as 0.001% to ensure pure sound quality; while industrial buzzers allow 0.5% - 1% distortion as long as it does not affect the alarm function.
Both the KT148A and KT142C chips have a low total harmonic distortion, ensuring that the output sound is faithful to the original signal, which is crucial for clear voice transmission.
6.Number of Channels
Determines the spatial performance of sound, including mono, stereo (2 channels), and multi - channel (5.1/7.1). Home theaters need 5.1 channels to create a surround - sound scenario, while small devices such as smart watches use mono to reduce power consumption and size.
The KT148A and KT142C mainly support mono and stereo outputs, suitable for most small - scale audio applications.
The KT142C can be configured to meet different channel requirements through external circuits, providing more flexible output options.
7.Frequency Response (Hz)
The range of the chip's processing capacity for sounds of different frequencies. Ideally, it should cover the audible range of the human ear (20Hz - 20kHz) and maintain a flat response. Baby monitors need to focus on optimizing the 300 - 3400Hz frequency band (the core range of human voice), while professional mixers require a balanced response across the full frequency band.
The KT148A and KT142C chips are designed to cover the audible frequency range of the human ear, ensuring the accurate reproduction of sounds of various frequencies.
The KT142C has better frequency - response characteristics and can handle more complex audio signals.
8.Other Key Parameters for Practical Selection
Storage Capacity
The KT148A has a built - in 420KByte voice storage space, supporting a maximum voice length of 420 seconds at an 8KHz sampling rate. It is suitable for applications with a large number of short voice segments, such as multi - function alarms.
The KT142C has a built - in 320KByte memory, capable of storing up to 320 seconds of audio. It supports the MP3 format, which is convenient for users to update audio files.
Power Consumption
The KT148A has excellent low - power performance, with a standby power consumption of less than 25uA and an ultra - low - power mode of 1.5uA. It is very suitable for battery - powered devices such as wireless doorbells and remote controls.
The KT142C has a standby current of about 5mA in normal mode and can enter a low - power mode with only 2uA, making it suitable for applications that require a balance between performance and power consumption.
Interface and Control
The KT148A supports one - wire serial communication, simplifying the circuit design and making it easy to integrate into small electronic devices. It also allows users to replace voice content through the serial port.
The KT142C supports UART serial control with a default baud rate of 9600. It also has a USB interface, enabling users to update audio files by connecting to a computer like a USB flash drive, which is very convenient for applications that require frequent audio updates.
Drive Capacity
The KT148A can directly drive an 8 - ohm 0.5W speaker. In simple applications, there is no need for an external amplifier, reducing the overall cost and size of the device.
The KT142C can not only directly drive an 8 - ohm 0.5W speaker but also support DAC output for connection to an external amplifier (such as HAA2018), making it suitable for scenarios with high - volume and high - quality sound requirements, such as home audio systems.
Product details, product information, and sample acquisition and ordering links: KT148A
KT142C
#VoiceChip #KT148A #KT142C #SoundQualityParameters #SelectionGuide
🎙️ From OTP Woes to Flash Wonders: The KT148A - SOP8 Voice Chip Story
Ever wondered about the magic behind those voice - prompt gadgets in your daily life? Let's dive into the world of SOP8 voice chips, and how the KT148A is turning the industry on its head.
The SOP8 Voice Chip Evolution
SOP8 - packaged voice chips have been around the block. Starting from the early days with Taiwanese manufacturers like Youhua, Chi - Qi, and SoCCOM using 4 - bit machine tech in toys, they've come a long way. Thanks to domestic solution providers like Weichuang, these chips now have a standardized set of features. They're everywhere - in your blood pressure monitors, smart door locks, security alarms, and those cute electronic doorbells.
The Standardized SOP8 Features
Audio Muscle
These chips can drive an 8Ω/0.5W speaker like a pro. And if you need more oomph, just hook up an external amplifier. It's like having a sound system that can adapt to any volume need.
Control Freak's Dream
One - wire Serial Port: Think of it as a super - simple way for your chip to talk to other parts of the device. Single - byte commands, and it uses pulse width to tell 0 from 1. Ideal for those minimalist set - ups.
Two - wire Serial Port: A bit more sophisticated. The clock and data lines work together, making sure the communication is rock - solid. It's like having a reliable messenger for your chip's data.
Independent IO Trigger: One IO port, one voice segment. You can set it to play when the device powers on, trigger it once, or loop it. So much flexibility!
OTP Chips: The Old Guard's Troubles
Production Nightmares
Remember those OTP (One - Time Programmable) chips? Once you burned the program into them, that was it. If there was a mistake during mass production, the whole batch could be toast. Talk about a quality - control headache!
Development Delays
Getting an OTP chip ready was no walk in the park. You needed special voice - making tools, sound - editing software, and those fancy download and programming devices. And if your client changed their mind? Hello, long delays and extra costs as you waited for the supplier to step in.
Cost Conundrums
The more voice storage you needed, especially for high - quality, long - duration stuff, the more expensive the OTP chip got. And then there was the inventory issue - order too much, and you're stuck with useless chips. Order too little, and the cost per chip skyrockets.
Enter the KT148A - SOP8: Flash - Powered Savior
Flash Magic
The KT148A uses Flash storage, and it's a game - changer. You can burn the program as many times as you want. So, no more panicking about mistakes in production. And if the market says, "Hey, change that voice," you can do it without a hitch. Plus, it solves the inventory problem - no more dead stock!
DIY Dream
You don't need to rely on the supplier to change the voice. Just use the PC tool that comes with the KT148A, and you're good to go. It's like having the power to update your device's voice on your own terms. Say goodbye to long waiting times and hello to quick product updates!
Cost - Effective Champ
In the world of voice chips, the KT148A is a cost - saver. For voice scenarios over 40 seconds, it beats the traditional OTP chips in terms of cost. And with a whopping 420 - second storage (at 8kHz sampling), it can handle all your complex voice - prompt needs.
Easy - Peasy Development
All you need is a USB - to - TTL downloader (the CH340G is a great choice), and you can burn the program. No need for those fancy, expensive tools. It's like opening the door to voice - chip development for everyone!
Hardware 101: Using the KT148A - SOP8
Power Play
2.0 - 3.5V: Short VBAT and VDDIO, and use pin 8 for positive power.
3.5 - 5.5V: Keep VBAT and VDDIO separate. If you're using a lithium - battery, just plug it into pin 8 VBAT.
Download Dance
Connect pin 2 (PB9) to the RX of the USB - to - TTL, and pin 3 (PB1) to the TX.
Short pin 5 to the ground, power on, wait for the "beep," then let go. Now you can upload voice files using the PC tool.
Testing Time
Use a CH340G - USB - to - TTL module, hook up an 8Ω/0.5W speaker, press the DOWN - KEY, and power on. You're on your way to seeing (or rather, hearing) the KT148A in action!
So, there you have it - the journey of the KT148A - SOP8 from the pain of OTP to the promise of Flash. What kind of voice - enabled projects would you use it for? Let's chat in the comments!
#KT148A - SOP8 #VoiceChip #FlashTech #OTPChips #ElectronicsGeek
KT148A voice chip in consumer electronics products in South Korea #voice...
KT148A Sound Chip
Voice Chip The KT148A Sound chip is developed by Shenzhen Qingyue Electronics Co., Ltd. and is widely used in security, transportation, and other fields. The KT148A is a 32-bit DSP voice chip in a standard SOP8 package. It features a built-in 420KByte voice storage space, supporting a maximum voice length of 420 seconds, multi-segment voice playback, direct driving of a 0.5W speaker, and user-replaceable voice content.
Chinese Name: KT148A Sound Chip Developer: Shenzhen Qingyue Electronics Co., Ltd. Type: Voice Chip Applications: Security, transportation, and related fields
1. Product Overview
The KT148A is a 32-bit DSP sound chip in a standard SOP8 package. It has a built-in 420KByte voice storage space, supporting up to 420 seconds of audio, multi-segment playback, direct driving of a 0.5W speaker, and allows users to replace voice content.
2. Product Advantages
Cost Reduction & Reprogrammability: Improved manufacturing processes lower costs while allowing repeated firmware updates.
User-Replaceable Voice Content: Voices can be easily updated via a computer using a serial port.
Ample Storage Space: The chip provides sufficient memory for voice data.
3. Product Features
32-bit DSP voice chip, 5MHz internal oscillator, PLL up to 120MHz.
Operating voltage: 2.0–5.5V (Note: Hardware adjustments are required for voltages below 3.3V).
Standby power consumption <25μA, with an ultra-low power mode of 1.5μA.
16-bit PWM output, capable of directly driving an 8Ω/0.5W speaker.
Includes a tool for converting audio formats.
Supports 200 seconds at 16KHz or 400 seconds at 8KHz.
Voice content can be updated via a PC tool through a serial port.
Supports single-wire serial port control.
Supports up to 224 addressable segments.
Hardware I²C and UART interfaces.
Supports repeated firmware updates.
4. Hardware Specifications
The chip adopts a System-on-Chip (SoC) design, integrating a 16-bit MCU and a dedicated audio-decoding aDSP. It uses hardware decoding to ensure system stability and sound quality. The compact package size allows easy integration into other products.
5. Usage Notes
Power Supply Recommendations:
A 5V power supply is recommended for higher speaker driving power and louder output.
For lithium battery (3.3–4.2V) applications, connect the positive terminal directly to Pin 8.
For dry battery applications, also connect the positive terminal directly to Pin 8.
For ultra-low voltage (2–3V, e.g., coin cell) applications, short Pin 7 and Pin 8, then connect to the positive terminal.
6. Testing Instructions
The chip's Pin 4 is the test pin. Triggering it to ground (via a button or tweezers) will play the next voice segment. After connecting the speaker and powering the chip, use Pin 4 to test playback by grounding it.
Mega drive sounds :0
Music with illustration vídeo: https://www.youtube.com/watch?v=Y34PFx5FPY0&t
Super nintendo and nintendo 64, channels timbres.
(eno93)
