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    Sound synthesizer
    5.
    发明专利
    Sound synthesizer 未知

    公开(公告)号：GB2218252A

    公开(公告)日：1989-11-08

    申请号：GB8904224

    申请日：1989-02-24

    Applicant: SEIKO EPSON CORP

    Inventor： KATSUI MASAMI ,  TERASHIMA YOSHIYUKI

    IPC: G10H1/00 ,  G10H1/057 ,  G10H1/42 ,  G10H1/46 ,  G10H7/04

    Abstract: A sound synthesizer comprises a main store for data providing melody information, and at least one sound source (3) controlled by data signals output from the main store for generating an output representing melodic sound. The sound source comprises a further store (61) for data regarding the timbre of a sound, and a pitch control circuit (59, 60) which, in response to the respective data signal representing sound pitch output from the mains store, is arranged to co-operate with the further store so as to generate a sound quality signal representing sound of a selected pitch and timbre. The sound source further comprises a sound control circuit (55, 56, 57, 58, 63, 65) responsive to the sound quality signal and to at least one further data signal representing a further sound characteristic (e.g. volume or envelope shape) output from the main store for providing the output from the sound source. A further sound source generates an output representing rhythmic sound and comprises a noise generating circuit and two bell sound generating circuits.

    Generating sound waveform signals
    8.
    发明专利
    Generating sound waveform signals 未知

    公开(公告)号：GB2216739A

    公开(公告)日：1989-10-11

    申请号：GB8905285

    申请日：1989-03-08

    Applicant: SEIKO EPSON CORP

    Inventor： TERASHIMA YOSHIYUKI ,  KATSUI MASAMI

    IPC: G10H1/043 ,  G10H7/02 ,  G10H7/04

    Abstract: Waveform data is stored in a store 105 and is repeatedly read at a frequency corresponding to the pitch of the desired sound. A predetermined period for reading the waveform data is divided by a given number for generating a corresponding number of timing intervals of a predetermined length, and the length of an aribitrarily selected one or plurality of the timing intervals is changed to make fine adjustment of the predetermined reading period and thereby to make fine adjustment of the frequency. A further store 104 stores data representing at frequency dividing ratio, of variable frequency dividing means 101 which generates pulses to increment the addresses in the first store 105. Control means 102, 103 change the frequency dividing ratio of the variable frequency dividing means 101 during the period for reading the waveform data. Details of the variable frequency dividing means 101 are given (fig 5).

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