Electronic musical instrument with key coding in a key address memory
阅读：301发布：2022-02-23
专利汇可以提供Electronic musical instrument with key coding in a key address memory专利检索，专利查询，专利分析的服务。并且In an electronic musical instrument, an actuation of a key switch produces a key address code corresponding to the key switch. This key address code is stored in a key address memory. A tone clock pulse corresponding to the key address code is selected from among a plurality of tone clock pulses. A musical tone wave shape memory stores in analog a wave shape to be reproduced. The musical tone wave shape is read from this wave shape memory at a reading rate corresponding to the tone clock thus selected. Attack and decay of the musical tone wave shape envelope are stored in analog in an envelope memory. When the key address code is stored by the actuation of the key switch, a clock pulse is selected to read out the attack wave shape portion at a reading rate corresponding to this clock pulse. When the key switch is cut off, another clock pulse is selected to read out the decay wave shape portion at a reading rate corresponding thereto. The read out output of the envelope memory is applied to the voltage control terminal of the musical tone wave shape memory thereby causing the musical tone wave shape memory to produce from the output thereof a musical tone wave shape with the desired envelope.，下面是Electronic musical instrument with key coding in a key address memory专利的具体信息内容。
1. An electronic musical instrument comprising, in combination: a. a preloaded wave shape memory in which a multiplicity of amplitude samples of at least one period of a complex musical tone wave shape have been stored in analog representation, said wave shape memory having for each sample a respective readout control terminal whose energization causes the respective sample to be read out of said memory and b. read out means coupled to the read out control terminals of said wave shape memory for repetitively reading out in succession the stored samples of the wave shape in said memory at a selectable rate and producing therefrom repeated cycles of voltage, each cycle having a wave shape matching that of said stored wave shape and a period determined by the selected rate of readout, said read out means comprising a key address memory for storing a key address code consisting of a note code, an octave code and a keyboard code, a selecting circuit for selecting a tone clock pulse from among a plurality of tone clock pulses at frequencies corresponding to respective keys in response to note and octave codes stored in said key address memory, a wave shape readout counter receiving said selected tone clock pulse, and gate circuitry for receiving the output of each stage of said wave shape readout counter and successively applying an energizing output corresponding to the count of said counter to each readout control terminal of said wave shape memory.
2. An electronic musical instrument according to claim 1, wherein said read out means is adapted to simultaneously repetitively read out in succession the stored samples in said wave shape memory at a plurality of selectable rates and to simultaneously produce therefrom a like plurality of groups of repeated cycles of voltage, eAch cycle of each group having a wave shape matching that of said stored wave shape and a period determined by the selected rate of readout for the respective group.
3. An electronic musical instrument comprising, in combination: a. a preloaded wave shape memory in which a multiplicity of amplitude samples of at least one period of a complex musical tone wave shape have been stored in analog representation, said wave shape memory having for each sample a respective readout control terminal whose energization causes the respective sample to be read out of said memory and b. read out means coupled to the read out control terminals of said wave shape memory for repetitively reading out in succession the stored samples of the wave shape in said memory at a selectable rate and producing therefrom repeated cycles of voltage, each cycle having a wave shape matching that of said stored wave shape and a period determined by the selected rate of readout, said read out means comprising a key address memory for storing a key address code consisting of a note code, an octave code and a keyboard code corresponding to a depressed key, a selecting circuit for selecting a tone clock pulse from among a plurality of tone clock pulses having frequencies respectively corresponding to twelve note-identifying keys of the highest octave of several encoded octaves in response to the note code stored in said key address memory, a wave shape readout counter receiving said selected tone clock pulse, a select switch for switching the connection of each stage of said wave shape readout counter in response to the octave code stored in said key address memory, and gate circuitry for receiving the output of each stage of said wave shape readout counter and successively applying an energizing output corresponding to the count of said counter to each readout control terminal of said wave shape memory.
4. An electronic musical instrument as defined in claim 3 which further comprises an additional preloaded wave shape memory similar in construction and content to the first-mentioned wave shape memory, and means for interchanging said wave shape memories in response to the keyboard code stored in said key address memory.
5. An electronic musical instrument comprising, in combination: a. a preloaded wave shape memory in which a multiplicity of amplitude samples of at least one period of a complex musical tone wave shape have been stored in analog representation, said wave shape memory having for each sample a respective readout control terminal whose energization causes the respective sample to be read out of said memory; b. read out means coupled to the read out control terminals of said wave shape memory for repetitively reading out in succession the stored samples of the wave shape in said memory at a selectable rate and producing therefrom repeated cycles of voltage, each cycle having a wave shape matching that of said stored wave shape and a period determined by the selected rate of readout; c. a preloaded envelope memory in which an analog representation of an envelope wave shape for said musical tone is stored; d. second read out means for reading said analog representation from said envelope memory at a selectable rate; e. means for feeding the output of said envelope memory to an input terminal of said wave shape memory; and f. means in said wave shape memory for multiplying the output of said envelope memory and the output of said wave shape memory, thereby producing a wave shape of said musical tone with an envelope.
6. An electronic musical instrument as defined in claim 5 in which said envelope memory stores amplitude samples of an attack portion and a subsequent decay portion of said envelope wave shape.
7. An electronic musical instrument as defined in claim 6 wherein said second readout means is capable of reading out said attack portion and said decay portion independently at a selectable rate.
8. An electronic musical instrument comprisinG a keyboard, means coupled to said keyboard for providing in a time-sharing manner a key address code and a key data signal synchronized with each other, said key data signal being produced when a selected key of said keyboard is depressed, a plurality of key address memories, means for searching for an unloaded memory among said plurality of key address memories, means for searching whether said key address code synchronized with said key data signal is already stored in a key address memory, means for applying a key address code which is not already stored to said unloaded memory, a wave shape memory for storing analog samples of a musical tone wave shape, means for selecting a tone clock pulse from among a plurality of tone clock pulses in response to the key address code stored in said key address memory and applying it to a wave shape readout counter connected to said wave shape memory thereby causing the wave shape of said musical tone to be read from said wave shape memory.
9. An electronic musical instrument as defined in claim 8 in which said means for providing a synchronized key address code and key data signal comprise a key address generator which receives clock pulses from a clock generator and produces successively changing key address code each consisting of a note code, an octave code and and a keyboard code, a first decoder which receives the note code from said key address generator and produces an output successively on a plurality of output lines, a second decoder which receives the octave code from said key address generator and produces an output successively on a plurality of output lines, a third decoder which receives the keyboard code from said key address generator and produces an output successively on a plurality of output lines, AND circuits each having three input terminals and being provided for each octave of a key switch and means for producing the key data signal from the output of the AND circuit corresponding to the octave to which the depressed key belongs by connecting the outputs of said first, second and third decoders to the input terminals of said AND circuit when the key address code corresponding to the depressed key is produced by said key address generator, whereby the key address code in synchronization with said key data signal is the key address code representing the depressed key.
10. An electronic musical instrument as defined in claim 8 in which said means for searching whether said key address code synchronized with said key data signal is already stored comprise a plurality of coincidence circuits which compare the contents of said key address code with those stored already in said key address memories and produce identical binary outputs when these contents coincide with each other, and OR gates which receive the binary outputs of said coincidence circuits.
11. An electronic musical instrument as defined in claim 8 in which said means for searching for an unloaded key address memory comprise a detection circuit for detecting whether said memory is loaded or unloaded, a search counter having a plurality of output lines and producing an output on either one of said output lines, a search clock pulse generator and a logic circuit for passing a search clock pulse to said search counter; when said memory is loaded and blocking the search clock pulse when said memory is unloaded, thereby causing said search counter to stop its counting operation when the output of said detection circuit indicates an unloaded key address memory.
12. An electronic musical instrument as defined in claim 8 in which said means for applying a key address code to a unloaded key address memory comprise, blanking means for passing said key data signal synchronized with said key address code only when said coincidence circuit does not produce an output, and a gate circuit which is controlled by a specific output of said search counter produced when it is suspending its counting operation and which passes the key data signal provided from said blanking means thereby causing said key address codes to be applied to said unloaded key address memory.
13. An electronic musical instrument as defined in claim 8 which further comprises an envelope memory for storing analog samples of an envelope wave shape, an envelope clock pulse generator, and detection means for detecting the storage of said key address code in said address code memory and applying an envelope clock pulse from said pulse generator to said envelope counter thereby causing the envelope to be read from said envelope memory, a modulated musical tone signal being obtained from a product of the musical tone wave shape and the wave shape of said envelope.
14. An electronic musical instrument as defined in claim 13 in which said detection means comprise an envelope counter for applying a readout control signal successively to readout control terminals of said envelope memory through a decoder, means for applying an attack clock pulse to said envelope counter upon depression of the key until said envelope counter has counted a predetermined count thereby reading an attack wave shape portion and thereafter reading a constant amplitude wave shape portion by stopping the counting operation of said envelope counter, and means for applying a decay clock pulse to said envelope counter upon release of the key thereby causing said envelope counter to resume its counting operation and to read the decay wave shape portion, the application of the decay clock pulses being stopped when the reading out of said decay wave shape portion is completed.
15. An electronic musical instrument as defined in claim 14 in which the frequencies of said attack clock pulses and decay clock pulses are selectable.
16. An electronic musical instrument as defined in claim 13 comprising means for detecting, while key address codes are stored in all of the key address memories, an envelope counter among all the envelope counters which is most advanced in its counting operation over a predetermined count, means for stopping said detected envelope counter so as to designate the gate circuit of the key address memory corresponding to the detected envelope counter and means for clearing the detected key address memory and envelope counter upon receipt of the key data signal and thereafter causing a key address code synchronized with said key data signal to be stored in said key address memory.
17. An electronic musical instrument as defined in claim 16 in which said detecting means comprise a truncate counter for each key address memory to which the count of each envelope counter is transferred and means for applying a clock pulse to said truncate counter at a high rate thereby causing said truncate counter to count at a corresponding high rate, whereby the envelope counter which is most advanced in its counting operation is detected by the truncate counter first producing an overflow output.
18. An electronic musical instrument comprising a wave shape memory for storing at least one period of wave shape, a plurality of readout counters which respectively receive a readout pulse having a selected frequency, a plurality of gate circuits provided at the output terminals of said readout counters, a decoder connected to the readout control terminals of said wave shape memory, a ring counter which operates at a high counting rate and provides time-sharing control pulses to each of said gate circuits, and means for applying the output of each readout counter in a time-sharing manner to the readout control terminals of said wave shape memory through said decoder, thus producing a plurality of musical tone wave shapes having frequencies different from each other.
19. An electronic musical instrument comprising a wave shape memory in which sample amplitudes of at least one period of a musical tone wave shape are stored, an envelope memory in which sample amplitudes of an envelope wave shape are stored, a plurality of wave shape readout counters which respectively receive clock pulsEs having a selected frequency, a plurality of envelope readout counters which respectively receive clock pulses having a selected frequency, and means for applying the outputs of corresponding wave shape readout envelope and readout counters in synchronization with each other and in a time-sharing manner to decoders connected respectively to the readout control terminals of said wave shape memory and said envelope memory and producing at the output terminal of said wave shape memory a voltage representing a product of the wave shape amplitude stored in said wave shape memory and the wave shape amplitude stored in said envelope memory, thereby producing a plurality of musical tone wave shapes with an envelope in a multiplexed form.
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