Voice Broadcast Chip Solution: Text-to-Speech Conversion with Flexible Functionality

Voice broadcast chip solution, providing text content to voice conversion, functions can be single-wire, dual-wire, button, etc. The speaker can be directly pushed or an amplifier can be added.

Development Considerations

EMC Design

The voice signal line must be grounded to avoid running parallel to high-frequency circuits.

For direct push solutions, it is recommended that the speaker wire length be ≤15cm to reduce signal attenuation.

Cost Optimization

For low-end scenarios, use TRSP3020 (unit price about 0.2 yuan).

For high-end TTS requirements, prioritize WT3000T8 (supports dynamic text updates).

Certification Requirements

Export products must comply with FCC Part 15 (wireless functions) and RoHS (restriction of hazardous substances).

The requirements are very professional and clear, covering a complete voice broadcast solution from Text-to-Speech (TTS) generation to multiple driving methods. Such chips are commonly referred to as Speech Synthesis Chips (TTS Chip) or Smart Voice Broadcast Modules.

We will provide you with a complete solution for high integration, high flexibility, and high sound quality smart voice broadcast PCBA.

Core Solution: Smart Voice Broadcast Module PCBA Solution (Flexible, Clear, Easy to Use)

The core of this solution is a SoC chip with a built-in TTS text-to-speech engine, which can receive text through a simple communication protocol and real-time synthesize clear and natural speech to be played through a speaker.

System Architecture Block Diagram

flowchart TD
    A[“Main Control MCU/External Device”] --> B[“Communication Interface<br>（UART/I2C/Single Wire）”]
    B --> C[“TTS Speech Synthesis Chip”]
    C --> D[“Audio Amplifier”]
    D --> E[“Speaker”]

    F[“External Trigger Button”] --> C

    subgraph C[TTS Chip Internal]
        C1[“Text Parsing Engine”]
        C2[“Speech Synthesizer”]
        C3[“Audio DAC”]
    end

    C --> G[“Functional Core”]
    G --> H[“Multi-Protocol Communication”]
    G --> I[“Multi-Language Synthesis”]
    G --> J[“Multiple Voice Selection”]
    G --> K[“Volume/Speed Adjustment”]

1. Chip Solution Selection (Sound Quality, Functionality, Cost)

Based on synthesis sound quality and functional complexity, there are mainly two technical routes:

Feature	Solution 1: TTS Speech Synthesis Chip (Recommended, Comprehensive Functionality)	Solution 2: OTP Voice Chip (Extremely Low Cost, Fixed Content)	Analysis and Suggestions
Working Principle	Dynamic Synthesis. The chip has a built-in voice library and synthesis algorithm, which can synthesize speech in real-time after receiving text commands.	Fixed Playback. Pre-recorded audio is burned into the chip, and it can only play fixed content.	If dynamic broadcasting is needed (such as amounts, station names, temperatures), Solution 1 must be selected.
Flexibility	Very High. Can change broadcast content at will without reprogramming the chip.	Zero. Content is fixed and cannot be changed.	Solution 1 has an absolute advantage.
Sound Quality	Good. The synthesized sound quality is clear and supports multiple voice types (such as female voice, male voice, child voice).	Depends on the audio source. Sound quality can vary.	Solution 1 can meet the needs of most prompt scenarios.
Development Difficulty	Simple. Control can be achieved by sending simple commands via UART, such as `<span><span>[Broadcast] Hello World</span></span>`.	Simple. But requires custom audio.	Both are simple, but Solution 1 has zero maintenance costs.
Cost	Medium (chip costs about 10-20 yuan).	Low (chip costs about 1-3 yuan).	Solution 1 is worth the cost for flexibility.
Representative Models	iFLYTEK XFS Series, Yuyin Tianxia SYN Series	Weichuang Zhiyin WT Series, Anshi Ya, etc.	XFS5152, SYN6658 are mainstream models in the market.

Conclusion: For applications that require dynamic content broadcasting (such as bus stop announcements, queue calling, amount reminders), Solution 1 (TTS Speech Synthesis Chip) is the only feasible solution.

2. Detailed Solution (Taking TTS Chip as an Example)

Taking the iFLYTEK XFS5152 chip as an example for detailed explanation.

1. Core Function Implementation

Text Input: Your main control MCU (such as STM32, ESP32) sends simple control commands to the XFS5152 via UART serial port.

Example Command: [v5][m3][t5] Please call customer 102 to window 3.
Command Explanation: [v5] sets the volume to 5, [m3] sets it to female voice, [t5] sets the speed to 5, followed by the text to be broadcasted.

Speech Synthesis: After the chip receives the text, it real-time calls the built-in voice library and synthesis algorithm to convert the text into smooth, natural voice signals.
Audio Output: The chip outputs analog audio signals, which can directly drive small power speakers or be sent to an amplifier IC to drive large power speakers.

2. Multiple Control Methods (Meeting Your Needs)

Serial Mode (Most Common): Communicates with the main control MCU via UART, allowing flexible control and the ability to broadcast any content.
Button Mode: The chip provides multiple IO ports, which can connect independent buttons, each triggering a segment of preset fixed voice (must be set in advance via serial port).
Single Wire Mode: Some chips support single wire serial communication, saving MCU IO port resources.

3. Audio Driving Solutions

Direct Push Speaker: The chip has a built-in small power Class D amplifier (such as 0.5W-1W), which can directly drive 8Ω/1W small speakers, suitable for indoor and close-range use.
External Amplifier: If larger volume is needed (such as outdoor or noisy environments), an external audio amplifier IC (such as PAM8403, HT6872) must be used, which can drive 3W-10W speakers.

3. Advantages of the Solution

Strong Flexibility: Content can be changed at any time, making product upgrades convenient.
Natural Sound Quality: The synthesized voice is clear and natural, without mechanical sound.
High Integration: A single chip achieves complete text-to-speech conversion.
Simple Development: Standard UART communication, easy to integrate.

4. Typical Application Scenarios

Bus Stop Announcement System: Dynamic broadcasting of arrival information.
Queue Calling System: Broadcasting numbers and windows.
Smart Meters: Broadcasting measurement data (such as weight, temperature).
Alarm Notification System: Broadcasting device status and fault information.

5. Specific Requirements for Your Confirmation

To provide you with the most accurate solution and chip selection advice, please clarify the following key questions:

| Customization Items | Details You Need to Confirm |

| :— | :— |:— |

| 1. Broadcast Content | Is the content to be broadcasted fixed or dynamic? (For example, “Welcome” is fixed, while “Current temperature 25.6 degrees” is dynamic) |This is the most critical decision point |

| 2. Control Method | Prefer to choose serial control, button control or single wire control? | |

| 3. Operating Environment | What is the noise level of the device’s operating environment? This determines the power and driving method of the speaker. | |

| 4. Target Cost | Do you have a rough expectation for the target cost of the PCBA? (The cost of TTS solutions is higher than that of fixed voice solutions) | |

We look forward to your detailed requirements! We can recommend the most suitable TTS chip model and provide complete reference designs.

Smart classification garbage bin sensing chip development vibration sensing opening module classification prompt voice IC solution

FD6288Q-QFN24 is a driving chip used in drones and electric toys.

Bluetooth headset charging case mainboard development with digital display screen/wireless charging/LCD screen/LED light.