JPH0632040B2 - Recording / playback device - Google Patents

Description

The present invention relates to a recording / playback apparatus having a voice storage function.

In a conventional recording / reproducing apparatus, a magnetic tape recording system is generally used. On the other hand, recently, along with the miniaturization of calculators, radios, etc., there is an increasing demand for miniaturization of voice recording devices, that is, tape recorders. However, the conventional tape recording system is not suitable for small size. One is that it is difficult to reduce the size of an advanced mechanism such as a motor having a function of controlling the rotation of the tape, and at the same time, it is difficult to reduce the weight. Secondly, since it drives a mechanism such as a motor relay, it consumes a considerable amount of power, and a battery, which is a power source of a portable device, has a too short life and its commercial value decreases. For the three, the mechanism is loaded due to the miniaturization, and at the same time, the miniaturization of the tape is unavoidable and the reproduced voice quality becomes poor. For the four, it takes time to search because the tape is fast-forwarded and reversed.

In order to solve the above problems, an object of the present invention is to provide a recording / reproducing apparatus which uses a semiconductor memory instead of a conventional magnetic tape, is small in size, is light in weight, and takes a short time to start reproduction. To do.

According to the present invention, in a recording / reproducing apparatus, a microcomputer having an address control function and a clock function, an A / D converter for converting a voice signal into a digital signal, and an address control function of the microcomputer are used for addressing. A semiconductor memory area for storing a digital signal and recording time data or recording time data obtained based on the clock function of the microcomputer, and a keyboard for inputting the address of the semiconductor memory area to the address control function of the microcomputer or A switch and the digital signal read from the semiconductor memory area at an address designated by the address control function of the microcomputer based on an address input from the keyboard or the switch during reproduction. And a D / A converter that converts the digital signal of the recording time data or the recording time data into an analog signal, and a speaker that reproduces the analog signal converted by the D / A converter as voice. And

Hereinafter, the present invention will be described in detail based on examples.

The block diagram in FIG. 1 shows the essence of the present invention, and 1 is a memory area. The address of this memory is determined by the address counter 8. The clock signal CL is the A / D converter 4, the D / A converter 5
At the same time as the sampling clock of the address counter, the data input / output of the memory is controlled in synchronization with the two converters as the clock of the address counter. The audio signal input from the microphone 2 is amplified by the amplifier 3, digitized by the A / D converter 4, and stored in the memory 1. This is the recording operation. For reproduction, the data output of the memory is converted into an analog audio signal by the D / A converter 5, and the speaker 7 is driven by the amplifier 6. I / O
The port 10 receives a signal from the keyboard or the switch 9 and controls recording, reproduction and retrieval, and also outputs an address display to the display body 11. Keyboard 9
When the address is specified by, the address specified immediately is called, and there is no waiting time because there is no fast-forward and reverse-back function like tape. Here, if the address counter 8 is a microcomputer including a program, more advanced functions can be performed. For example, automation of recording and reproduction, repeat, automatic search and the like. or,
Since the I / O port 10 in FIG. 1 has a register function, it is possible to hold the output from the clock circuit by a common clock signal and notify the display body of time and time. That is, the clock function can be shared, and the recording time and time can be stored in the memory at the same time and displayed on the display during reproduction.

FIG. 2 shows one example of the memory of the present invention. Voice memory needs to be non-volatile in nature. C like this
When a MOS memory is used, the quiescent current is very small, so that it is possible to make nonvolatile by extremely low power consumption. Also, the operating power is 10 μA or less at 15 V because the addressing frequency is at most about 10 KHz. BZT, ▲ ▼ are data input / output lines, A is an address line, and transistor 1
Control 4,15. Reference numerals 12 and 13 form an inverter flip-flop for storage.

FIG. 3 shows another specific example of a memory as a voice storage medium. A floating gate 16 is embedded in the insulating film 17. Substrate N on drain P ^+
When a voltage higher than that at which avalanche breakdown occurs is applied to −, high-energy electrons cross the barrier of the gate film and are injected into the floating gate, which is maintained for 10 years or more. Therefore, the channel resistance of the transistor is determined by the amount of injected charges.

FIG. 4 shows this relationship. That is, the avalanche voltage Vav
The above is applied to the drain to control the channel resistance Ref. This injection time is about 100 μsec. Vav can be up to about 5V.

FIG. 5 shows voice recording using this non-volatile memory cell,
The structural example of a reproducing | regenerating apparatus is shown. The voice input AIn is the amplifier 18
Is input to the cell after being amplified by the buffer 19, the bias of the memory cell is matched with that of the memory cell by the buffer 19. The cell 22 is composed of a memory transistor 23 and an address control transistor 24, and is selected by an address signal A '. E is a charge erasing signal. Play is
The transistor 25 is turned on by OE, and the load resistance Re
The resistance of the channel is directly detected by the amplifier 20
The speaker 21 is output via. The memory transistor used here is a floating gate (FAMOS)
It is not limited to the type, but may be any non-volatile type such as MNOS of a tunnel. In the embodiment described here, the memory is directly accessed by an analog signal, and A in FIG.
Although the / D converter 4 and the D / A converter 5 can be omitted, the CMOS memory 1 of the previous example is digitally used.
It does not matter at all that the bit is simply replaced with one bit of the non-volatile memory.

The present invention uses a semiconductor as a memory element, and the required capacity is 16 Kbit / sec in the digital memory system and 2 Kbit / sec in the analog memory system, for example, 2 μm.
Using a 256 Kbit / chip non-volatile memory using a pattern, 6 chips can be used to record sound for 15 minutes of storage time. Even if a wristwatch is considered, this can be made compact enough to fit. Therefore, this miniaturization is sufficiently achieved and a dramatic weight reduction can be realized. In addition, since the motor has no power at the time of recording and reproducing, the power consumption was low enough to be used even with a normal silver battery.

Further, the control IC used in the present invention becomes more convenient by combining the functions of a calculator, a clock and the like. For example, the memory can be used not only for the voice storage area, but also for storing time, time, calculating stage or storage device. If the controller is a microcomputer, functions such as a clock, a calculator, and a voice memory can be controlled by a series of software, and the same chip can be realized. Further, the display unit can be used for all of the display of the voice address, the display of the clock, and the display of the computer, and it becomes possible to produce a portable information device of high commercial value which is made compact by integrating all semiconductors.

As described above, according to the present invention, at the time of recording, the recording time data or the recording time data is obtained based on the clock function of the microcomputer, and the audio digitized signal and the recording time data or the recording time data are recorded by the microcomputer. The address can be specified by the address control function of the computer and stored in the semiconductor memory area. Further, at the time of reproduction, it is possible to read out from the semiconductor memory area of the address designated by the address control function of the microcomputer on the basis of the address input from the keyboard or the switch, D / A convert the digital signal and reproduce it as voice. Since a single microcomputer has a clock function and an address control function, it is possible to provide a compact and lightweight recording / reproducing apparatus with good operability.

[Brief description of drawings]

FIG. 1 is a block diagram of the present invention. 1 is a semiconductor memory device, 8
Is an address controller, 9 is a keyboard, 10 is I /
O port, 11 is a display. Also, 2 and 3 are voice input units, 4 is an A / D converter, 5 is a D / A converter, and 6 and 7 are voice input units. FIG. 2 is a diagram showing a CMOS memory cell. FIG. 3 is a diagram showing an example of a floating gate type (FAMOS) nonvolatile memory transistor. FIG. 4 shows the drain applied voltage and the channel equivalent resistance Ref.
Relationship diagram. FIG. 5 is a diagram showing a configuration example of an audio storage / reproduction device using the nonvolatile memory cell 22. 21 is a speaker.

Claims (1)

[Claims] 1. A microcomputer having an address control function and a clock function, an A / D converter for converting a voice signal into a digital signal, and an address specified by the address control function of the microcomputer. A semiconductor memory area for storing recording time data or recording time data obtained based on the clock function of the microcomputer; a keyboard or switch for inputting the address of the semiconductor memory area to the address control function of the microcomputer; Sometimes, the digital signal and the recording time data read from the semiconductor memory area at the address designated by the address control function of the microcomputer based on the address input from the keyboard or the switch. Recording / reproducing, comprising a D / A converter for converting the digital signal into an analog signal in the recording time data or a speaker for reproducing the analog signal converted by the D / A converter as voice. apparatus.