JPH02208696A - Recording, reproducing and copying system for music and music reproducing device - Google Patents

Abstract

PURPOSE:To enable the sound recording, reproducing and copying of music which employs a semiconductor memory as a sound recording medium by converting analog audio signal for music into a digital signal and storing it on a semiconductor memory. CONSTITUTION:The semiconductor memory 10 is constituted by using eight 16M-bit mask ROMs 10a and musical sound is recorded by converting the analog audio signal for the music into the digital signal and writing the digital signal in the semiconductor memory 10. Further, this device is equipped with an expander 17 which expands and linearizes music data compressed and recorded in 8-bit format into original 12-bit data according to a compressing/expanding method, a D/A converter 18 which converts the digital signal into the analog audio signal, and an amplifier 19 which amplifies and supplies the audio signal to headphones 28. Consequently, a rotary part is eliminated to realize the small- sized music reproducing device, thereby realizing high reliability and long life.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention records music information on a recording medium, reproduces the music as audible sound from the recording medium, and reproduces the contents of the recording medium on which the music information is recorded. Music recording/copying to another recording medium
The present invention relates to a reproduction/copying method and a music reproduction device that reproduces music as audible sound from a recording medium.

(Prior Art) In place of using records and tapes for recording, reproducing, and copying music, CDs have recently become popular, and this makes it possible to record and reproduce music with high fidelity.

(Problems to be Solved by the Invention) However, this CD still relies on rotary drive for playback, and the playback device is structurally complex and bulky, requiring high mechanical precision for the read head. Rotary type devices have disadvantages such as being susceptible to vibrations, consuming large amounts of power, and having a limited lifespan. Especially when trying to make a portable CD player, malfunctions are likely to occur due to vibrations and shocks.

Therefore, in view of the current situation where semiconductor memories are becoming more highly integrated and faster each year, the present invention provides a music recording, playback, and copying system that uses semiconductor memory as a recording medium, and a music playback device using this system. The purpose is to provide.

(Means for Solving the Problems) In order to achieve this object, the present invention uses a semiconductor memory as a recording medium as a music recording method, and converts an analog music audio signal into a digital signal and stores it in the semiconductor memory. Store.

As a music reproduction method, reading of a semiconductor memory as a recording medium in which music audio signals converted into digital signals are stored is controlled.

Play music by converting it to analog.

As a music copying method, a semiconductor memory is used as a recording medium in which music audio signals converted into digital signals are written, and the reading control is performed on a semiconductor memory, and the writing control is performed on another semiconductor memory to copy the music. As DRAIII, SRAJEPROM%EEPROI
II, mask ROM, etc. can be considered.

A music playback device implementing the above-mentioned method forms a memory set section into which a semi-conductor, conductive memo, or device is removably set as a recording medium, controls reading of the semiconductor memory, and records the read digital data. A player device is configured by providing a playback circuit that converts music information into analog and supplies it to a music output device.

The reproduction circuit can also be formed integrally with the two semiconductor memories on the same chip or on a cart so that it can be set in the memory set section.

In order to record on the set semiconductor memory, a switch for switching the semiconductor memory to a write mode is provided, and a recording circuit for writing input music information to the semiconductor memory is further provided.

In order to also provide a copy function, two memory set units are provided, and a write/read function is used to control the reading of music information from one of the set semiconductor memories, and to write the read music information to the other semiconductor memory. Add a control circuit.

(Operation) Music recording is performed by converting an analog music audio signal into a digital signal and writing it into a semiconductor memory. Reproduction is performed by controlling reading from such a semiconductor memory, and copying is performed by controlling reading from the semiconductor memory and writing to another semiconductor memory.

As a playback device, when the playback circuit is activated with the semiconductor memory set in the memory set section, the semiconductor memory is read, and the read digital music information is converted into analog and output from the music output device. Output as audible sound.

If a light mode changeover switch and a recording circuit are added to the playback device, recording is performed by writing input music information to the semiconductor memory while switching the set semiconductor memory to the light mode.

If two memory set sections and a write/read control circuit are added to the playback device, copying between both semiconductor memories becomes possible.

(Embodiments of the Invention) Hereinafter, an apparatus for implementing the recording/playback/copying method of the present invention will be described.

First, FIGS. 1 and 2 show a music reproducing device t (player) according to an embodiment of the present invention.

In FIG. 1, 10 is a semiconductor memory.

It is constructed using eight 16M bit mask ROM leas. These ROMs, as shown in Figure 2,
It is embedded in a business card-sized cart 9 that has plug contacts 9a for input/output at the end, and is inserted into the opening 1a of the playback device case 1, which is configured to be thin for portable use, so that it can be attached to and detached from the built-in jack contacts. It is designed to engage.

A clock generator 11 generates a clock at 40 kHz, which is twice the maximum audible frequency of 20 kHz, based on the principle of sampling. In other words, the total storage capacity of memory 10 is 1
6M pits x 8-128M bits, and the media capacity required for 1 second is 40K assuming the amount of quantized information is 8 bits.
x 8 = 120 bits. therefore.

It is possible to record for 6 minutes and 40 seconds, and 8 masks R.
oll IOa is divided into two groups and two songs are recorded.

Reference numeral 12 denotes a counter for counting input music selection signals, and displays 1 or 2 on the 1 indicator g12a, and selects 187 or group 2 of the mask ROM 10a based on its output data. Reference numeral 13 denotes an address counter, which sequentially performs address scanning of one selected group of mask ROM IOa by counting clock pulses supplied through an AND gate 14, and is cleared by a clear signal through an OR gate 15a.

A flip-flop 16 is set by a start signal and reset by a reset signal supplied through an OR gate 15.

17 is a decompressor that decompresses and linearizes music data that was compressed to 8 bits according to a well-known compression/decompression method to save media capacity during recording, to its original 12 bits. . 18 is D/^hen! which converts the digital signal into an analog audio signal. ＃It is a vessel. ] 9 is an amplifier that amplifies the audio signal and supplies it to the Hechthorn 28.

These reproducing circuits 11 to 19 are housed in a thin reproducing device case l shown in FIG. This case further includes a built-in battery, a music selection switch 21 that generates a music selection signal, a music selection display 12a, a start switch 22 that generates a start signal, a reset signal switch 23 that generates a reset signal, and a power switch 2.
4 are also arranged.

Plug 28a of headphone 28 is also plugged in.

When listening to music, insert the desired card 9 into the opening 1a of the playback device case L, and use the music selection switch 21 to select and display the first or second song on the music selection display 12a.
Next, when the start switch 22 is operated, the address counter 13 is cleared and the flip-flop 16 is set to supply a clock to the address counter 13. As a result, one selected group of mask ROMs 10a is further sequentially selected and read out, expanded, analogized and amplified, and music is outputted from the headphones 28. When the final address of the group to which it belongs is reached, the clock generation is automatically interrupted through the OR gate 15, the address counter 13 is cleared, and the performance is stopped. If you want to interrupt the performance, press the reset switch 23.
A similar stopping action will be performed when you operate .

FIG. 3 shows a circuit configuration of a recordable playback device according to another embodiment of the present invention, namely, in the circuit portion shown in FIG.
A /D converter 33, a 12-bit to 8-bit compressor 34, etc. are added. Further, a non-volatile RAM 30 is used as the semiconductor memory, and an R/'I switch for this memory is added to the playback device case. When recording the audio from the microphone 31 in the set semiconductor memory 30, the R/II changeover switch is switched to the right side, the start switch 22 is operated, and writing is performed in the memory selected by the song selection switch 21.

Furthermore, as another embodiment, when providing a copying function to the reproduction device, for example, openings 1a for the cart 9 are provided on both sides of the reproduction device case l shown in FIG. 2, and data read from one semiconductor element is transferred to the other. Configure the circuit to write.

In the above-described embodiment, if the reproducing circuit is also formed integrally with the semiconductor memory on the same chip or card, it becomes possible to set semiconductor memories of various types or media capacities in a common reproducing device. It is also possible to use the semiconductor memory as a leadless chip carrier and provide the cartridge in the playback device. Using the medium capacity of IG bit, which is expected to be developed in the near future as a semiconductor memory, it will be possible to record and play approximately 56 minutes with one memory. A stereo effect can also be obtained by configuring the semiconductor memory so that multiple areas, ie, multiple channels, are read out in a time-division manner.

(Effects of the Invention) As described above, according to the present invention, it is possible to realize a compact music playback device that eliminates rotating parts, and high fidelity is ensured by playing back digital signals.

By using a complete circuit with no mechanical parts, you can quickly control track selection, repeat, etc., and it also has high reliability, long life, and
Energy saving and low price. This is especially advantageous for portable use.

If the reproducing circuit is also integrated with the semiconductor memory, semiconductor memories with various characteristics can be easily set in a common reproducing device.

Recording and copying functions can be easily added to the playback function in one circuit.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a circuit configuration of a music playback device according to an embodiment of the present invention, FIG. 2 is a plan view of a case of the music playback device according to the same embodiment, and FIG. 3 is a circuit diagram according to a modification of the same embodiment. FIG. 3 is a diagram showing the configuration. l...Playback device case, 9...Cart, 21...
・Track selection switch, 22...Start switch, 23・
...Reset switch, 28...Headphones. Figure 2

Claims (1)

[Claims] 1) A music recording method that uses a semiconductor memory as a recording medium and converts an analog music audio signal into a digital signal and stores it in the semiconductor memory. 2) A music playback method that controls the reading of a semiconductor memory as a recording medium in which a music audio signal converted into a digital signal is written, and then performs analog conversion to play back music. 3) A music copying method in which reading of a semiconductor memory is controlled as a recording medium in which music audio signals converted into digital signals are written, and writing is controlled to another semiconductor memory to copy music. 4) In a music player device that is removably set in a recording medium setting section and that plays a recording medium on which music information is written and outputs music information as audible sound from a music output device, A reproducing circuit includes a memory set section in which a semiconductor memory as a medium is removably set, controls reading of the semiconductor memory, converts the read digital music information into analog, and supplies it to a music output device. A player device comprising: 5) The player device according to claim 4, wherein the reproduction circuit is formed integrally with the semiconductor memory and is configured to be set in the memory set section. 6) In order to record on the set semiconductor memory, the apparatus further comprises a switch for switching the semiconductor memory to a write mode, and a recording circuit that controls writing of input music information to the semiconductor memory. 6. The player device according to 4 or 5. 7) Writing in which two memory set sections are formed, the reading of music information from one of the semiconductor memories set in these memory set sections is controlled, and the read music information is written into the other semiconductor memory. -Claim 4 or 5, further comprising a readout control circuit.
The player device described in .