Surround Sound Decoder

Posted on Jan 5, 2013

The particular circuit does?t have the requirement to replace the trade decoders Surround, because this they have many more facilities and possibilities. It give however the possibility in many try with this article of decoding. The coding in Stereo Dolby Surround show the tendency to be abandoned and is replaced with digital DTS, Dolby 5.1 etc, that is supported in the digital level of management and transport, sound signal. In order that appears also in the Fig.2, the stereo sound signal that transport the surround information, is drive for the Lch in the IC1A and Rch in the IC1B, that is input buffer with the next stages.

Surround Sound Decoder
Click here to download the full size of the above Circuit.
Surround Sound Decoder - image 1
Click here to download the full size of the above Image.

Then follow the stages of summing [ IC2C ], which add up the signals of channels L+R and him drive to the output for central loudspeaker and a differential amplifier [ IC2D ], that rise the difference of phase L-Rch with which is written in the two channels, the information for Rear loudspeakers. The exit of IC2D drive one regulated delay unit of sound to Rear loudspeakers, so that are created the sense of space and her adaptation in the size of our own room. It?s constituted by the IC5, that is a opamp. sound delay signal of 512 stages. The timing of IC5 becomes from the IC4, that is a oscillator. The delay time is regulated by variable capacitor C17. In order to we cut the noise that is produced by this process exist certain filters then, regulated they cut the frequencies above 8KHZ and under 100 HZ roughly, after we behind did ?t need bigger frequencies bandwidth, to drive the Rear loudspeaker. The Rear information is written with bandwidth of 100HZ until 8KHZ, for this reason Rear loudspeaker has small size. These filters are found round the IC6A/B, that is output buffer, too. In all the outputs exist potesometer that help in the right level regulation of amplifiers and loudspeakers, that follows. Obvious it?s that each exit should drive single power amplifier .The circuit is supplied by symmetric voltage ± 15V. Part List R1-2-7-8-12-13-18-19-20=47Kohm C11-12-15=10uF 25V RV1-RV2=2X10Kohm Log. pot....

Leave Comment

characters left:

New Circuits



Popular Circuits

50 Watt Power Amplifier
telephone line loger
LED Brake/Rear Light Specifically for motorcycles Circuit diagram
60 Watt Guitar Amplifier
Automatic UPS system wiring circuit diagram (New Design Very simple) for Home or Office
Whites Classic I metal detector schematic diagram
LED Modulation Circuits
Build A Byte Blaster Circuit
100V output with shunt regulation
Light-emitting diode rectifier circuit
Zero sequence voltage phase protection circuit 2