Abstract: A system for controlling the second field in auditorium having the feature that stage and audience seating areas are different acoustically, which includes a first assisted acoustics system whereby acoustical energy from the stage area is input, and then controlled acoustic energy is supplied to the audience seating area, and a second assisted acoustics which is provided independently of the first electronic acoustical augmentation system, whereby acoustical energy from the audience seating area is input, and then controlled acoustic energy is supplied to the stage area. Each assisted acoustics system includes acoustic energy input devices and acoustic energy output devices whereby a uniform rate of power decay coefficient can be effected throughout the hall, including spaces under balconies and the like. Significantly improved the degree of acoustic similarity between the stage area and audience seating area is achieved by controlling reverberation characteristics.

Abstract: A packet data generator for generating complementary packet data which are added to information data for packet transmission via a high speed PCM transmission line. The packet data generator includes first and second memories for storing the complementary packet data; an address counter for counting an address at the timing of a synchronization signal of the high speed PCM transmission line; a multiplexer for changing the connection of the first and second memories; and a synchronization circuit for outputting a switching signal to the multiplexer in synchro with an output from the address counter. Since two memories are provided, while one memory is used for supplying complementary packet data at the data transmission speed, the other memory can be used for storing new complementary packet data at the CPU processing speed. The new complementary packet data are supplied by switching from the one memory to the other memory in synchro with a synchronization signal of the high speed PCM transmission line.

Abstract: In studio, stage or field applications, high fidelity audio signals are transmitted to a remote processor in digital form in order to solve the problems of audio degradation, cross talk, ground loops and multi-cable problems associated with the analog transmission of multiple channels of audio over long distances. In one embodiment a TDM/FDM multiplexing system is utilized with increased bandwidth and dynamic range compared to data and telephone multiplexing systems to accommodate high fidelity requirements. In an embodiment involving a distributed system, multiple MUX and DEMUX modules are coupled in a distributive fashion along a light-weight transmission line, in which each of the modules is assigned a predetermined transmission frequency and with each of the modules having a number of audio inputs which are time-multiplexed for that particular MUX module and frequency.

Abstract: A music delivery arrangement permitting a subscriber to select from among a plurality of available music selections, particular selections that he wishes to hear at any time. The plurality of music selections are "played" at a central "jukebox" facility. They are frequency multiplexed onto one or more communication channels that are typically used to carry video information, such as cable television channel. The video channel information is distributed to individual subscribers either via unused channels of a cable television system, by direct broadcast at commercial television frequencies, by direct satellite transmission to a subscriber, or by some other means. The subscriber uses a converter box to demultiplex and thereby select a desired musical selection for demodulation. Demodulation can take place in the subscriber's FM broadcast receiver or in some other apparatus.

Abstract: A system for wirelessly transmitting stereo audio from a source such as a tape player to a removed location. The output signal-carrying wires from the source are connected to a coupler unit adapted to removably hold an FM band stereo broadcast microphone/transmitter. The audio output signal is coupled to the microphone/transmitter which, in turn, transmits the audio signal to an FM stereo receiver at the remote location where it is then rebroadcast for listening. In one embodiment, the coupler unit acoustically couples the signal to the microphone. In a second embodiment, the coupler unit inductively couples the signal to the microphone.

Abstract: A sound reproduction system with an improved audio mixing console provides means for instantaneous recordation of the positions of control elements on modules of the mixing console. Means are also provided for recalling the recorded positions and indicating to the sound engineer the recorded positions by use of a pair of light-emitting diodes adjacent to each control element on the console.

Abstract: A system for distributing signals from an audio source to key telephone station instruments is disclosed. By controlling the impedance relationship between the station instruments, lines and amplifier output, cross-feeding of signals from one station instrument to another or back-feeding of signals to the audio source is prevented.