ISD1964SYI

Interface - Voice Record and Playback

ISD 1964SYI is an audio recording chip developed by International Speech Systems. It is designed for single-chip voice recording and playback applications. It provides up to 64 seconds of high-quality mono recording for a wide range of applications.

Application Field

ISD1964SYI can be widely used in educational toys, toy robots, smart home appliances, portable dictaphones, talking dolls, talking story books, speech recognition products and other similar applications. It is perfect for optimizing the product design process and allowing the product to take advantage of voice control. It can also be used to enhance interactive experiences and create novel functions such as greeting cards and ebooks with voice recordings.

Working Principle

ISD1964SYI consists of an audio codec, an AD/DA converter and an analog amplifier. It operates at +/- 5.0V power supply, with a recording rate of up to 64kbps. The chip includes a Digital Signal Processor (DSP) to process the incoming audio signal and an Audio Coder/Decoder (ACD) to convert the incoming audio signal into a digital 8-bit pulse code modulation format. It supports three recording modes, including loop mode, serial mode, and twister mode. It can also support two playbackRead modes, single cycle read mode and loop Read mode.

ISD1964SYI also has an onboard microphone pre-amplifier, line-in amplifier and line-out amplifier. The microphone pre-amplifier is used to amplify the incoming microphone signal, while the line-in amplifier is used to amplify the line-in signal. The line-out amplifier is used to output the recorded audio to an external device. The line-out amplifier supports multiple outputs such as a mono headphone jack and stereo speakers.

ISD1964SYI also has several on-chip hardware features, including a volume control and mute control. The volume control allows users to control the level of the audio playback, while the mute control eliminates any unwanted noise during playback. Additionally, the chip supports recording cycle memory, which is a feature that allows the chip to store the last recording before powering down. This can be especially useful for devices with limited or no memory for storing recordings.

Conclusion

The ISD1964SYI offers a simple and cost-effective solution for voice recording and playback applications. Its integrated codec and on-chip microphone pre-amplifier, line-in and line-out amplifiers make it an ideal choice for embedded single-chip applications. It can be used in a variety of audio recording and playback applications due to its low power consumption and excellent audio performance.