JPH0465398U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall circuit configuration of an electronic keyboard instrument to which an automatic accompaniment device according to an embodiment of the present invention is applied, and FIG. 2 is a layout of the accompaniment key range of the keyboard shown in FIG. 1. FIG. 3 is a diagram showing an example of how the CPU determines chord types and their root notes based on combinations of keys pressed in the accompaniment range of the keyboard shown in FIG. 2, and FIG. FIG. 5 is a diagram showing an example of the accompaniment pattern stored in the ROM shown in FIG.
FIG. 6 is a diagram showing a pitch change table stored in the ROM shown in the figure, and FIG. 6 shows an example of an accompaniment pattern generated in response to a key depression in the accompaniment key range of the keyboard shown in FIG. 7 are external views of an electronic keyboard instrument incorporating the circuit shown in FIG. This is a flow chart for explanation. 1... CPU, 2... ROM, 3... Keyboard, 4
...Switch group, 5...Sound source section, 6...D/A conversion section, 7...Amplifier, 8...Speaker.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A pitch specifying means comprising a plurality of pitch operators for specifying the pitch of a musical tone to be generated, and in response to the operation of the pitch operator of the pitch specifying means. A first determination means that determines the chord type and root note, an operator means that can be operated externally, and a second determination means that detects that the external operator means has been operated and generates a detection signal. accompaniment pattern storage means for storing an accompaniment pattern consisting of a chord pattern expressed using a reference chord type and root note and a bass pattern accompanying the chord pattern; a first converting means that converts the pitches of the chord pattern and the bass pattern of the stored accompaniment pattern based on the chord type and root tone determined by the first determining means; a second converting means for maintaining the pitch of the bass pattern of the accompaniment pattern converted by the converting means based on the generation of a detection signal from the second determining means; An automatic accompaniment device comprising: a converting means; and an accompaniment sound generating means that generates an accompaniment sound signal based on the accompaniment pattern converted by the second converting means. 2. The automatic accompaniment device according to claim 1, wherein the external operator means comprises a foot operator that can be depressed. 3. The second converting means includes a first detecting means for detecting the beginning of each measure of the accompaniment being played;
a second detection means for detecting whether or not a detection power signal from the second determination means is generated at the beginning of each bar detected by the detection means; 2. The automatic accompaniment device according to claim 1, further comprising: a maintaining means for maintaining the bass tone from when the occurrence of the bass tone is detected to when the occurrence is no longer detected. 4. The maintaining means includes a root storage means for storing the root determined by the first determining means,
Automatic accompaniment according to claim 3, characterized in that when the second detection means generates the detection signal, the pitch of the bass note is maintained at the pitch of the root note stored in the root note storage means. Device.