ISD1760EY

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The ISD1760EY is a single-chip analog audio recording controller, which can record and play audio signals of 8/16/20/ 24KHZ sampling rate formats. The device includes simple, low-cost, low-power recording and playback solutions for system designs such as toy, educational, and communication applications.The following sections will discuss in brief the application field and working principle of the ISD1760EY.

Application Field

The ISD1760EY can be used in a variety of applications, including toys, educational devices, automated voice reminders, alarms, security systems, and communication devices. In addition, the device can also be used as a sound recorder and playback system in a variety of other applications such as home entertainment, music boxes and sound effects systems.

Working Principle

The ISD1760EY is a CMOS single-chip audio recording controller. It contains a built-in 4 18-bit A/D converter and 4 20-bit D/A converter, plus dc level-shift electronics and feedback control circuitry to produce a sound playback system with very few external components. The device also has an internal 128kB memory cell array to store the audio data and other necessary parameters for microphone recording and playback.

The device enables voice record up to 10 seconds in maximum and playback for up to 30 seconds with edit functions of cut and join. The internal memory architecture consists of 128KB of RAM for recording, a ROM for storing control codes, and an I/O port. The device can support 8/16/20/24KHZ sampling rate formats. The system also includes a VU meter display to show the intensity of the recorded audio signal as well as a volume knob to adjust the volume of the sound playback.

In order to record a voice signal, the user has to press the record button. The A/D converter then converts the incoming audio signal which is saved in the internal RAM. When the user press the “Play” button, the audio signal is read from the RAM and the D/A converter converts this digital signal into an analog signal, which can then be output to an amplifier or a loudspeaker.

The ISD1760EY can also be used to playback more than one recording with the unique ability to join and cut sounds as desired. In addition, the device includes noise cancellation and echo elimination algorithms to improve the audio signal quality.

In short, the ISD1760EY is a very powerful, versatile and cost-effective device for enabling audio recording, playback and editing with a minimum of external components. The device has been used in a variety of applications such as toys, educational devices, automated voice reminders, alarms, security systems and communication devices.

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