Home-made high-performance four-dimensional surround sound amplifier circuit

The surround processing section C1891A is a product from Sony Corporation of Japan that features a four-dimensional home theater surround processing circuit. It includes a parent roll phase-shifting circuit and a matrix surround sound amplifier. Additionally, it provides three types of analog stereo sound field effect modes, including concert hall and cinema. The specific electrical paths for each function are illustrated in Figure 10-20, with the following pin configurations: left and right channel output pins, left and right sound channel input pins, surround output pin, and a state select pin (which connects to a +5V level to change the sound field mode). The circuit utilizes a CD4017 for a one-button selector switch that indicates the selected status, along with a pin for effect adjustment.

The C1891A surround processing circuit is designed to enhance audio experiences in home theater systems. It incorporates advanced signal processing techniques to create an immersive sound environment, simulating the acoustics of various venues. The phase-shifting circuit allows the manipulation of sound waves to achieve a more realistic spatial audio effect, improving the listener's perception of sound direction and distance.

The circuit's matrix surround sound amplifier takes input signals from the left and right channels, processes them, and outputs a surround sound experience through dedicated surround output pins. This setup enables the creation of a multi-dimensional audio field, providing a more engaging listening experience. The inclusion of various sound field modes, such as concert hall and cinema, allows users to tailor the audio output to their preferences and the type of content being played.

The functionality of the C1891A is further enhanced by the use of the CD4017 decade counter, which serves as a selector switch for the different sound field modes. This component allows for easy switching between modes with a single button press, providing convenience and accessibility for the user. The integration of a visual indicator helps users understand the current mode, facilitating a seamless experience.

Overall, the C1891A surround processing section exemplifies sophisticated audio engineering, combining various components to deliver a high-quality surround sound experience suitable for home theater applications.The surround processing section C1891A is Sony Corporation of Japan launched the four-dimensional home theater surround processing circuit parent roll phase shifting circuit matrix surround sound amplifier. Also set up a concert hall, a cinema, three kinds of analog stereo sound field effect mode. Application specific electrical path shown in Figure 10-20 r each function pins as outlined below: , feet to the left and right channel output; , feet to the left and right sound channel input; a feet surround output; a , pin state select pin (connected to + 5v level to change the sound field mode), the use of set circuit CD4017 made one-button selector switch status, and has shade indication dare fruit good; pin effect adjustment ends.