Abstract:
An envelope generator is provided with a count circuit the count value of which is varied through addition or subtraction or combination thereof, and a conversion circuit which operates to convert the count value into amplitude data, so as to generate an envelope having a shape corresponding to variations with time of the count value. According to one aspect of the invention, the count circuit is a circuit which carries out computation for exponentially varying the count value through polygonal line approximation, so as to form an envelope of exponential characteristic. According to another aspect of the invention, the conversion circuit is a memory which has stored amplitude data corresponding to count values in advance so as to convert count values in the last linear region of the envelope obtained by the polygonal line approximation into amplitude data in exponential relation and to convert count values contained in the remaining polygonal line regions into amplitude data in linear relation.
Abstract:
An envelope generator is provided with a count circuit the count value of which is varied through addition or subtraction or combination thereof, and a conversion circuit which operates to convert the count value into amplitude data, so as to generate an envelope having a shape corresponding to variations with time of the count value. According to one aspect of the invention, the count circuit is a circuit which carries out computation for exponentially varying the count value through polygonal line approximation, so as to form an envelope of exponential characteristic. According to another aspect of the invention, the conversion circuit is a memory which has stored amplitude data corresponding to count values in advance so as to convert count values in the last linear region of the envelope obtained by the polygonal line approximation into amplitude data in exponential relation and to convert count values contained in the remaining polygonal line regions into amplitude data in linear relation.
Abstract:
An electronic musical instrument comprises an upper keyboard channel, a lower keyboard channel and a pedal keyboard channel. The lower keyboard channel includes a tone gate which is actuated by a chord rhythm pattern pulse generated by an automatic rhythm generator to gate the lower keyboard tones. The pedal keyboard channel includes a root/subordinate tone generator which provide a root tone designated by the depressed pedal key and subordinate tones related to the root tone with predetermined musical intervals, and a tone keyer which is actuated by a bass rhythm pattern pulse generated by the automatic rhythm generator to gate the bass tones.
Abstract:
An electronic musical instrument is provided with a single controlled type signal processing circuit for processing multiplexed tone source signals corresponding to depressed keys and a circuit for preferentially selecting one of tone identifying signals corresponding to the depressed keys. The characteristic of the signal processing circuit is controlled by a tone pitch signal generated in accordance with the tone identifying signal thus selected, so as to reduce the number of a signal processing circuits.
Abstract:
An electronic musical instrument capable of producing a performance effect resembling arpeggio. Tones corresponding to one or more depressed keys are sequentially produced from the lowest tone or the highest tone and an octave range in which tones are produced is shifted toward a higher octave or a lower octave at completion of each cycle of the tone production sequence. This shift of octave is continued to a certain predetermined octave and, after the tone production in the predetermined last octave has been completed, the tone production is repeated from the original octave or the tone production is conducted with the octave range being shifted in a reverse direction.For realizing simulation of arpeggio, plural key information produced by depressing a plurality of keys needs to be selected in a predetermined sequence. To this end, an up-down counter is employed in an example of the present invention. In a mode of arpeggio-like performance in which the tone pitch sequentially rises, for example, counting in the up-down counter is started from 0 for comparing contents of the counter with the key information and, when there is coincidence, the counting is suspended and the lowest tone is produced in response to the key information. After the lapse of a set time, the counting is resumed for repeating the comparison and a next higher tone is produced. The same operation is repeated until the counter overflows, when the octave is shifted to a next octave. The tone production is made at a predetermined time interval (a regular mode) or at a preset time interval from start of depression of the key (a random mode).
Abstract:
An electronic musical instrument comprises a circuit for generating a stepwise envelope waveform which modulates a musical tone waveform signal, a detecting circuit for detecting the phase of the musical tone waveform signal where the amplitude of the musical tone waveform signal becomes the zero level, and a control circuit for bringing the amplitude of the envelope waveform to be at the zero level in synchronization with the detection of that phase of the tone signal by the detecting circuit if generation of the envelope waveform is to be finished, thereby to eliminate the generation of click sounds.
Abstract:
An electronic musical instrument comprising a plurality of tone forming systems having mutually different tone production modes. One of such tone forming systems can produce a tone continuously while another of such systems can produce a tone intermittently. Further, in a case where a plurality of tones are to be produced, one of such systems can produce these tones intermittently one tone after another while another of such systems can produce these tones simultaneously and intermittently. By producing tones from such systems of different tone production modes, an intricate musical tone effect is obtained.
Abstract:
A key switch structure which enables a reduction in the width of the key switch. A key switch structure comprises a first support member (22), a second support member (23), and a third support member which are arranged independently of each other, the first support member (22) having rotation pins (22d, 22e) and slide pins (22a, 22b), the second support member (23) having rotation pins (23e, 23f) and a circular columnar slide section (23a), the third support member having front end sections (24d, 24e), which are slidably held, and a support shaft section (24a). A key top (21) is supported by the support members (22, 23, 24) so that the key top (21) can move in the vertical direction. The length of at least one side of each of the support members is set to be less than or equal to the mounting diameter of a rubber dome (27).
Abstract:
There is provided a keyboard structure capable of preventing a fingernail of a user from being inserted between key tops and achieving uniform illumination without illumination leakage. A key top body portion (120a) and an upper sheet (120b) are integrally formed to form a key top (120) and a flange portion (120d) is formed by protruding the upper sheet (120b) from the key top body portion (120a) toward an outer circumferential direction. A frame (122) is disposed between the adjacent key tops (120) and a gap is closed by the flange portion (120d) of the upper sheet (120b) and a flange portion (122a) of the frame (122).
Abstract:
A semiconductor device is provided which has a semiconductor element having an element forming surface at which a sensor element is formed, a back surface on the opposite side of the element forming surface, and a light transmissive protective member laminated over the element forming surface via an adhering portion. The semiconductor device includes a region exposed from the protective member at the outer peripheral end portion of the semiconductor element, when viewed from the protecting member in a laminating direction.