JPS6235116B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic music box that stores a plurality of music pieces, allows selection of music pieces as appropriate, and generates the selected pieces of music without delay.

Traditional music boxes have gradually evolved from mechanical ones to electronic music boxes, but they only store a single song, and even if they are linked to a timer, the same song can be played over and over again. As a result, I get bored easily.

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned drawbacks and to provide an electronic music box that stores a plurality of songs and can generate the selected songs without delay.

Embodiments of the present invention shown in the drawings will be described below. FIG. 1 is a block configuration diagram showing one embodiment of the present invention, in which is a part that generates pulses, etc. for reproducing a song from memory, 1, a song playback part, and 1, a control unit for controlling pulses, etc. that indicate the beginning of a song. The pulse generator is shown. The present invention is an electronic music box that is provided in a music playback section and can play a preselected song by accessing first and second memories in which songs are stored. Access to select a song is started from the initial address of the memory with a pulse of a fast cycle, and when the start of the selected song is reached, the song is played back with a pulse of a normal cycle. In the pulse reproduction section, 24 is a 16th note pulse generation circuit which generates pulses of a frequency corresponding to the normal speed of a 16th note in order to reproduce a song from a memory to be described later. 29 is a counting circuit that counts the output of the 16th note pulse generation circuit, and the length of one counted corresponds to a 16th note of the song. Therefore, when you count two pieces, it is an eighth note,
3 correspond to a dotted eighth note, 4 to a quarter note, 6 to a dotted quarter note, 8 to a half note, 12 to a dotted half note, and 16 to a whole note. The tone length pulse generation circuit 31 controls the output of the counting circuit 29 using a value obtained by decoding the contents stored in the memory, which will be described later, to generate pulses corresponding to the tone length of each note that makes up the song, that is, pulses with a length of 16th tone, Pulses with lengths corresponding to the notes are sequentially obtained along with the song, such as a pulse with a length of a quarter tone, a pulse with a length of an eighth tone, and so on. Reference numeral 23 is a fast-forwarding pulse generator, which generates pulses at a high-speed frequency in order to fast-forward addresses so that the memory addresses are sequentially accessed from the beginning when playing songs stored in the memory, so songs that are not selected will not be played back. generate. Reference numeral 28 denotes a fast forward pulse/tone length pulse switching circuit, which switches whether to send a tone length pulse for music reproduction or a high speed fast forward pulse to the memory address circuit during memory reproduction, which will be described later.

In the song playback section, 34 is a first memory that stores the scale notes of a music song. The sound is expressed as “A” in hexadecimal, and the sound of “shi” is 16
It is stored as "C" in hexadecimal representation. Reference numeral 35 denotes a second memory for storing note lengths, for example, an eighth note is stored as "2", a quarter note as "4", and a whole note as "8". Addresses are used as many as the number of notes and rests for one predetermined piece of music, and the scale and tone length are respectively stored at the same address in the scale tone memory and tone length memory. 33 is an address circuit which generates an address signal for accessing the aforementioned memory. 36 is a scale tone decoder, and 37 is a tone length decoder, which decodes the digital signals stored in their respective memories. 38 is a scale tone generating circuit which applies the output of the scale tone decoder 36 and generates a predetermined scale tone. 32 is a sound separation pulse generation circuit;
This is a pulse generation circuit used to separate two notes when the same note in a song continues at the next address.
When the address signal changes, a negative pulse of an appropriate width is obtained with the next address signal and applied to the music reproducing circuit 39 together with the output from the scale tone generating circuit to add a break to the sound. Reference numeral 40 indicates an audio amplification/pronunciation circuit.

In the control pulse generation section, 21 indicates a song start pulse generation circuit. Since a song start code, for example "0", is stored in the address of the start of the song in the second tone length memory 35, when the second tone length memory is read, the output decoded by the decoder 37 is sent to the song start pulse generation circuit 21. When the tone length pulse controller 26 reaches the tone length pulse controller 26, a pulse indicating the beginning of the song is generated and applied to the tone length pulse controller 26. Reference numeral 22 denotes a song end pulse generation circuit, which generates a pulse at the end of a song, similar to the song start pulse generation circuit. Reference numeral 25 indicates a group of music selection switches, and when a predetermined music is selected, a switch closing signal is applied to a tone length pulse control circuit 26 and a fast forward pulse control circuit 27. Reference numeral 30 denotes an unnecessary sound erasing pulse circuit which uses the output of the fast feed pulse/tone length pulse switching circuit 28 to erase unnecessary sounds generated during address fast forwarding from the output of the scale tone memory 34.

The scale note memory 34 and note length memory 35 use read-only memories (ROMs) and store the contents of music pieces as described above, and in the case of the present invention, in particular, store a plurality of pieces of music. FIG. 2 is a diagram showing such a memory and its surrounding circuits. The address circuit 33 has eight stages of flip-flops connected in cascade, and the output a ₀ from each stage.
~ _a7 is extracted and used as the memory address. 4-bit outputs d ₀ to d ₃ of each of the memories 34 and 35
is read out for each address, and the value is sent to the decoder 3.
6, 37. FIG. 3 is a circuit diagram showing the rapid pulse generation circuit 23, the 16th tone pulse generation circuit 24, the rapid pulse/tone length pulse switching circuit 28, the counting circuit 29, the tone length pulse generation circuit 31, and their connections. . Terminals E, F, G, and H are shown to be connected to corresponding terminals in FIGS. 2 and 4. Further, it is appropriate to use a single integrated circuit as the rapid pulse generation circuit 23 or the 16th tone pulse generation circuit 24. Next, FIG. 4 is a circuit diagram showing the vicinity of the music selection switch _.
When any of _S4 is operated, a power supply circuit (not shown) is closed, a predetermined voltage is applied to each circuit, and the music box starts operating. FIG. 5 shows the circuit configuration of the delimiter pulse generating circuit 32. In the integrated circuit 19, address signals a ₀ , ₀ are used to take out a negative pulse of an appropriate width, and the negative pulse is taken out at the gate together with the output K from the scale tone generating circuit. FIG. 6 is a circuit diagram showing the scale tone generating circuit 38. The crystal oscillator 41 oscillates at a frequency of 10MHz, for example, and the frequency dividing integrated circuit 4
The frequency is divided by 2 and input to the programmable counter integrated circuit 43. Furthermore, since the output of the scale tone decoder 36 is input to the programmable counter integrated circuit 43, a scale tone is obtained at the output terminal K. To be sure, the above operation is summarized as follows. When you select a song with the music selection switch, the power supply circuit closes at the same time and the song enters the operating state. Access by fast-transfer pulse is started from the initial address of the memory by the address signal of the address generation circuit.
When the access progresses to the initial address of the song selected by the music selection switch in the fast forward pulse/tone length pulse switching circuit, the memory accelerator is switched to the tone length pulse, so that the selected melody can be generated.

Next, a second embodiment of the present invention is to operate a timer in a related manner. In other words, if a timer with multiple variable time settings is inserted and used in the main operating power supply circuit,
The same number of songs as the time setting can be played at a predetermined time. If the number of songs is equal to or greater than the number of time settings, each song can be heard once at a predetermined time. If the number of songs is small, it is also possible to repeat the same song. Further, the timer device shuts off the power supply circuit in response to the above-mentioned music box end pulse, and the music selection switch is closed to select the next music. At that time, at the next time set by the timer, the address of the memory is accessed from the original address by a fast-forwarding pulse, and a melody is generated in the music selected by the predetermined music selection switch.

In this way, according to the present invention, it is possible to use a small integrated circuit using semiconductor elements, so that a music box that is small and easy to use can be obtained even if it contains a plurality of songs. In addition, by combining it with a timer, the start time can be set like an alarm clock, which is effective.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the memory and its surrounding circuits in FIG. 1, FIG. 3 is a diagram showing the circuit of the pulse generator, and FIG. FIG. 5 is a diagram showing the vicinity of the music selection switch, FIG. 5 is a diagram showing the circuit configuration of the delimiter pulse generating circuit, and FIG. 6 is a diagram showing the scale tone generating circuit. ...pulse generation section, ...music playback section, ...
Control pulse generation section, 21... Song start pulse generation circuit, 22... Song end pulse generation circuit, 23... Fast feed pulse generation circuit, 24... 16th tone pulse generation circuit, 25... Song selection switch group, 34 ...Scale sound memory, 35...Tone length memory, 38...Scale sound generation circuit, _S1 to _S4 ...Switch.

Claims (1)

[Claims] 1. A first device in which scale notes of a plurality of musical pieces are stored.
a second memory storing the note lengths of the scale notes of the plurality of musical pieces at the same address as the first memory; It comprises an address drive circuit that drives at a fast cycle, a circuit that generates a musical piece based on the output of the scale note memory, and a music selection switch that selects a desired song, and the first and second memories are accessed at a fast cycle. The electronic music box is characterized in that the electronic music box starts from the initial address of both memories and accesses it by pulses of a normal cycle when the starting end of the song specified by the song selection switch is reached. 2. The electronic music box according to claim 1, wherein when both memories are accessed by pulses with a fast cycle, no music is generated by the pulses. 3 A separation pulse is generated at the end of the address signal that accesses both memories, and when the same scale of a song stored in the memory is accessed consecutively, the separation pulse creates a gap between the notes before the next note. An electronic music box according to claim 1 or 2, characterized in that the electronic music box is made of: 4. The electronic music box according to any one of claims 1 to 3, further comprising a timer circuit operated in conjunction with the music selection switch and inserted into the main operating power supply circuit.