An unusual use of an audio system with DOLBY SURROUND PRO LOGIC. Encyclopedia of radio electronics and electrical engineering

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After installing the TDA3810 processor, for example, in an AU receiver with a Dolby Surround Pro Logic decoder and multi-channel AC, the monophonic soundtrack of the TV acquires a noticeable "depth". This effect occurs due to the presence in the decoder for the rear signal of a time delay of several tens of milliseconds, which is absent in a conventional stereo processor. The author talks about installing the processor in the Technics SC-CH60 audio system used in conjunction with a TV and VCR.

The article [1] describes a device based on the TDA3810 sound processor, which makes it possible to obtain pseudo-stereo sound with a monophonic TV broadcast signal. This mode of operation of the microcircuit provides additional opportunities when using it in a more complex audio system.

The essence of the proposal is to install the TDA3810 chip in a mini-system, receiver or amplifier capable of playing stereo tracks through a DSPL (Dolby Surround Pro Logic) decoder with a multi-channel amplifier and a set of speakers. Despite the fact that the pseudo-stereo signal is very far from the DSPL format [2], the introduction of the TDA3810 into such a path creates a rather effective spatial sound picture.

The following briefly describes the processor and its installation in a Technics SC-CH60 mini system that has a DSPL decoder.

The processor scheme is shown in fig. 1. It differs from the typical one given in [3] in the absence of elements for providing the "Extended stereo" mode (this mode is not used in this device), as well as indication LEDs. Pin 12 of the DA1 chip is connected to a common wire, which corresponds to the "Pseudo-stereo" mode.

The sketch of the printed circuit board of the processor and the location of the elements on it are shown in fig. 2. The device uses MLT-0,125 resistors, capacitors C10 - C13 - K50-35, the rest - KM-4, KM-5.

The processor board is installed in the "Stereo Sound Processor SH-EH60" block of the mini-system. All processor connections are made to the switching board located at the rear of the case. Uynp entry is left free. The processor is powered from the +13 V power supply of the equipment. The left and right channel inputs are connected to standard "VCR INLUR" connectors. To do this, you must first unsolder the leads of the elements C706, R710 and C705, R709 (designations on the mini-system board) from the points of connection to the connectors. The wires of the inputs of the left and right channels of the processor are soldered into the vacated holes. Soldered conclusions are connected: C706 - with R710, and C705 - with R709. Solder the wires of the processor outputs of the right and left channels, respectively, to the connection points. The location of the holes for connection on the switching board is shown in fig. 3. Next, the board is fixed with a self-tapping screw on the stand on the right side of the case (Fig. 3).

Thus, after the work done, the VCR input is now intended for connecting sources with a monophonic path (the signal is fed to the left and right channels) - a TV, VCR, etc. Stereo signals can be fed to the VDP and EXT inputs of the minisystem.

If you need to connect a source that works in both mono and stereo modes, for example, a Hi-Fi VCR, then the processor must be supplemented with a two-position switch, which is installed on the rear wall of the SB-EH60 unit. In the "Stereo" mode, the switch must close the Ucontrol input to a common wire, in the "Pseudo-stereo" mode, leave this input free. The switch is also required if the processor is installed in a machine that has only one input.

When listening, the excellent work of the processor as part of the Technics SC-CH60 mini-system was noted. The sound in DSPL mode is especially impressive. If the decoder does not respond to a mono signal, then when the processor is turned on, all speakers create a noticeable spatial distribution of sound.

According to the above method, it is easy to equip the TDA3810 processor with another music center, receiver, amplifier with a DSPL decoder.

Literature

1. Brylov V. Stereo sound in ZUSCT. - Radio, 2001, No. 2, p. 9 - 11, 14; No. 3, p. 10 - 12.
2. Sokolova N. Sound engineering "home theater". - Radio, 1997, No. 5, p. 17 - 19.
3. TDA3810 surround sound processor. - Radio, 2001, No. 2, p. 49 - 51.

Author: P. Lyubimov

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