A coin-operated phonograph in which certain functions are remotely controlled. A transmitter is provided for transmitting a number of modulated carrier signals, including an up volume signal and a down volume signal. The phonograph carries a multi-channel receiver that is adapted for receiving the carrier signals transmitted by the transmitter. A detector is connected to the receiver for detecting the modulated carrier signals. An amplifier with gain control is provided and is controlled in accordance with receipt of the modulated carrier signals. A manually-operable volume control switch is carried by the phonograph and may be used instead of the transmitter to control the gain of the amplifier.

In a loudness control circuit, the output DC voltage of a first variable DC voltage source is applied to a first amplifier for increasing volume to vary the gain of the latter, and to first and second differential amplifiers, while the output DC voltages of second and third variable DC sources are applied to the first and second differential amplifiers to provide difference voltages, which the applied to second and third tone control amplifiers which amplify the low and high frequency ranges, respectively, to control the gains thereof, so that the components of the sound in the low and high frequency ranges are boosted, thus achieving the weighting.

An audio signal supplying device for supplying signals to an operating panel for a passenger provided in each of for many seats of a moving vehicle, such as an aircraft or a train, in which the necessity of providing a dedicated adapter or headphone or a device of a complex structure may be eliminated to save costs. The audio signal supplying device has plural operating units for passengers. For example, an operating unit 3.sub.1 for the passenger has a demultiplexor 12 as a channel selection means for selecting a desired channel and a controller 6.sub.1 for inhibiting part of channel selection executed by the demultiplexor 12 and for canceling such partial inhibition of channel selection by the demultiplexor 12 in response to a remote control signal received by a remote controlled light receiving unit 9.sub.1.

A multiple data stream processing arrangement includes a receiver/signal processor (14) and a plurality of signal input paths (11, 12) which meet at a junction (36). A junction output from the junction (36) provides a single input to the receiver/signal processor (14). A switching arrangement (16) is associated with the plurality of signal input paths (11, 12). The switching arrangement (16) includes a switch (31, 32) connected in each signal input path (11, 12). Each switch (31, 32) responds to an enable signal to allow a data stream applied to the respective input path (11, 12) to pass on to the junction (36) and to the receiver/signal processor (14). According to the invention only one signal input path (11, 12) and respective switch (31,32) is enabled at any given time.

A system for selecting and reproducing audio, video, or other humanly perceptible programs comprises a program source providing a multiplicity of program signals, a plurality of stations at which individual programs may be reproduced, a switching mechanism for selectively connecting selected program signals to the reproducing device at each station, and a microprocessor control unit operable upon user generated commands from each of the stations for controlling the switching mechanism in accordance with a user programmable set of instructions.