Abstract: A mono/stereo switching circuit wherein first, second, and third switches operate in circuit which is arranged so that (1) when the first switch is engaged, and the mono/stereo switch is engaged, the signal at a first mono input is provided to both of a pair of left and right output channels; (2) when the second switch is engaged and the mono/stereo switch is not engaged, the signal at a second mono input is provided to both of the pair of left and right output channels; and (3) when the input signal is a stereo signal at the first and second inputs, and either of the first and second switches is engaged, and the mono/stereo switch is engaged, the input signal at the first input terminal is provided at the left channel output while the input signal at the second input terminal is provided at the right channel output.

Abstract: Disclosed is an audio follow video mixer incorporating a manual cross fade learn feature. According to the invention, an operator may set the mixer so that a crossfade operation performed manually is stored in memory. The stored crossfade operation can thereafter be recalled and performed in an AUTO mode and an EDITOR mode. Also disclosed are LED indicators to visually indicate the status of the mixer, including which channel is active.

Abstract: Disclosed is a method and apparatus for configuring an audio follow video mixer used to process audio signals input from several multi-channel devices, such as VTRs. Input modules of the audio follow video mixer include a selection button for choosing the number of a VTR coupled to the mixer module and an LED display for visually indicating the VTR number to a user. The input modules also include buttons for selecting the audio channel of the selected VTR, as well as the preview bus for the selected audio channel.

Abstract: A stereo imaging circuit has a first channel input terminal, and a second channel input terminal; a variable resistance in circuit with each of the first and the second channel input terminals; a first amplifier in the first channel in circuit with the variable resistance, an output of the first amplifier in the first channel providing an input to a second amplifier in the first channel, an output of the second amplifier in said first channel providing an output of the first channel to a first channel output terminal; a first amplifier in the second channel in circuit with said variable resistance, an output of said first amplifier in said second channel providing an input to a second amplifier in the second channel, an output of the second amplifier in the second channel providing an output of the second channel to a second channel output terminal; a first interchannel amplifier having a variable transfer ratio and having an input in circuit with the first channel and an output in circuit with the second cha

Abstract: The invention in its main aspect comprises a printed circuit board having a bus extending along a predetermined length of a portion of said printed circuit board, the bus having a predetermined width and defining a plurality of openings therein following a predetermined regular pattern, the pattern having at least a first pair of openings positioned on a first lateral side of an imaginary line along the bus, and at least a second pair of openings positioned on a second lateral side of the imaginary line along the bus, the first and the second pairs of openings being relatively arranged so that a first lead interconnecting the first pair of openings is in a twisted pair relationship with a second lead interconnecting the second pair of openings.

Abstract: Disclosed is an apparatus for configuring an audio follow video mixer used to process audio signals input from several multi-channel devices, such as VTRs. Configuration of the audio follow video mixer system can be achieved either through several input modules which couple the multi-channel devices to the mixer, or preset configurations can be provided to the input modules and remotely located devices, such as a video editor, through a serial interface module.