US 4,358,981 A · Mixture generator for electronic organ

Abstract

An electronic organ, particularly of the institutional type employing classical voicing, having Swell and Great manuals as well as a full pedalboard wherein the manuals and pedalboard are multiplexed simultaneously to produce a plurality of synchronized serial data streams. Intermanual coupling is accomplished by connecting the data stream from one manual to the footage generation circuit of another manual, and footages are generated for each manual by utilizing tapped shift registers introducing controlled amounts of delay of the keyboard data before demultiplexing thereof. There is a bank of demultiplexer-keyers for each voice, such as flutes, principals, complex and percussion, which receive the serial data streams from one or more of the footage generators. The demultiplexer-keyers are supplied with tones and function to demultiplex the serial data streams and provide tones to the voicing circuitry selected in accordance with the keydown pulses in the serial data streams. Transposition is accomplished by transposing the demultiplex latch command ahead or behind in time so that the data stream is latched either early or late by one or more time slots depending on the amount of transposition selected. An automatic bass feature permits monophonic bass notes to be played without having to play the pedals, and this is accomplished by coupling into the pedal data stream the lowest data bit originating from the Great manual. Mixtures are generated by selectively delaying the serial data bits both by octave and sub-octave amounts and then combining the delayed data before demultiplexing thereof. The mixture content, which is either unison-mutation-unison or mutation-unison-mutation, is selected depending on the octave of the keyboard in which the key or keys are depressed.

Claims11

Dependent claims

In an electronic organ comprising a manual having a plurality of playing keys wherein some of the keys are located in a first part of the manual and others of the keys are located in a second part of the manual;

multiplex means for scanning said manual to produce a manual serial data stream comprising a plurality of time slots corresponding on a one-to-one basis to the keys of said manual and having a key actuated keydown signal in a time slot of an actuated key of the manual;
demultiplex means having an input adapted to receive serial data, said demultiplex means demultiplexing the serial data on its input and keying tones corresponding to the serial data on its input;
the improvement being a mixture generator interposed between said multiplex means and said demultiplex means comprising:
a data input to which said data stream is connected;
signal injection means responsive to the data stream for injecting a first keydown signal in a time slot of the data stream delayed from the key actuated keydown signal by an integer multiple of an octave and injecting a second keydown signal in a time slot of the data stream delayed from the time slot of said first signal by a non-integer multiple of an octave if the actuated key is located in the first part of the manual, and alternatively to injecting said first and second keydown signals, injecting a third keydown signal in the data stream in a time slot delayed from the key actuated keydown signal by a non-integer multiple of an octave and injecting a fourth keydown signal in a time slot of the data stream delayed from said third keydown signal by a non-integer multiple of an octave but delayed from the key actuated keydown signal by an integer multiple of an octave when the actuated key is located in the second part of the manual.

2 more elements

In an electronic organ comprising a manual having a plurality of playing keys wherein some of the keys are located in a first part of the manual and other of the keys are located in a second part of the manual;

multiplex means for scanning said manual to produce a manual serial data stream comprising a plurality of time slots corresponding on a one-to-one basis to the keys of said manual and having a key actuated keydown signal in a time slot of an actuated key of the manual;
demultiplex means having an input adapted to receive serial data, said demultiplex means demultiplexing the serial data on its input and keying tones corresponding to the serial data on its input;
the improvement being a mixture generator interposed between said multiplex means and said demultiplex means comprising:
a data input to which said data stream is connected;
signal injection means responsive to the data stream for injecting a first keydown signal in a time slot of the data stream delayed from the key actuated keydown signal by an integer multiple of an octave and injecting a second keydown signal in a time slot of the data stream delayed from the time slot of said first signal by a non-integer multiple of an octave if the actuated key is located in the first part of the manual to thereby produce a first mixture data stream, and for injecting a third keydown signal in the data stream in a time slot delayed from the key actuated keydown signal by a non-integer multiple of an octave and injecting a fourth keydown signal in a time slot of the data stream delayed from the third keydown signal by a non-integer multiple of an octave but delayed from the time slot of the key actuated keydown signal by an integer multiple of an octave when the actuated key is located in the second part of the manual to produce a second mixture data stream, and means for connecting the mixture data streams to the input of said demultiplex means;
means associated with said multiplex means for generating a series of digital timing signals corresponding respectively to the keys of the manual and synchronized with the manual data stream;
and said mixture generator comprising means for decoding the timing signals to determine whether the key actuated keydown signal occurring at that time is in the first part or the second part of the manual, said decoding means controlling whether the first or second mixture data stream is transmitted to said demultiplex means.

4 more elements

Dependencies are inferred from the claim text.

Mixture generator for electronic organ

Life of this patent

Mixture generator for electronic organ

Life of this patent

Abstract

Claims11