JPH058640Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a recording and reproducing device using a storage means (hereinafter referred to as RAM) that can read and write data to a storage medium.

When practicing foreign language pronunciation using a conventional magnetic recording and reproducing device, the user first records his or her own pronunciation and then plays it back for confirmation.

However, in order to perform the above operations using a conventional magnetic recording/playback device, it is necessary to (a) record one's own voice, (b) rewind the magnetic tape a predetermined length, and (c) receive audio signals from the magnetic tape. It was necessary to repeat operations such as playing back a video, and the disadvantage was that the operations were time-consuming.

The present invention has been developed in consideration of the above, and enables recording and playback without the need for rewinding and playback operations as in conventional magnetic recording and playback devices, and enables recording by outputting a notification sound when recording is possible. An object of the present invention is to provide a recording/playback device that notifies the user of the current state.

The configuration of the present invention will be explained based on FIG.

The recording/playback device of the present invention converts input analog audio signals (hereinafter referred to as audio signals) into digital signals (hereinafter referred to as audio signals).
A/D converting means 1 for converting audio signal data (indicated by the A/D converting means 1); RAM 2 for storing audio signal data converted by the A/D converting means 1; and converting the audio signal data read from the RAM 2 into analog signals. A D/A conversion means 3 is provided. In addition, the recording/playback device of the present invention further includes a recording instruction means 4 for instructing recording, and a RAM by the output of the recording instruction means 4.
write control means 5 which sequentially outputs address signals and write instruction signals to RAM 2 to write the audio signal data converted by A/D conversion means 1 to RAM 2; recording capacity storage means 6 which stores the storage capacity of RAM 2; , a readout control means 7 which sequentially outputs an address signal and a readout instruction signal to the RAM2 to read out the audio signal data stored in the RAM2, and when the recording instruction by the recording instruction means 4 is completed or when the written capacity of the RAM2 is When the recordable capacity stored in the recording capacity storage means 6 matches, the write instruction by the write control means 5 is terminated, and the reproduction start time determination means 8 instructs the read control means 7 to start reading, and the read is completed. Notification means 9 is provided for outputting a notification signal when this occurs.

The occurrence of a recording instruction by the recording instruction means 4 is detected by the write control means 5, and the audio signal converted by the A/D conversion means 1 is detected by the address signal and the write instruction signal output from the write control means 5. Data is sequentially stored in RAM2. Furthermore, each time the writing control means 5 writes, the written capacity and the recordable capacity stored in the recording capacity storage means 6 are compared by the reproduction start time determination means 8. The reproduction start time determining means 8 detects that the recording instruction by the recording instruction means 4 has ended or that the written capacity matches the recordable capacity, and the writing instruction by the writing control means 5 is terminated, and the readout control is performed. The reading control means 7 is instructed to start reading immediately or after a predetermined period of time has elapsed.
The read control means 7 sequentially outputs an address signal and a read instruction signal to the RAM 2 in response to a read instruction signal from the reproduction start determination means 8 or a signal after a predetermined period of time has elapsed since the read instruction signal.
The audio signal data stored in RAM2 is
The D/A conversion means 3 is read out sequentially from RAM2.
and is converted into an analog signal.
When all of the audio signal data stored in the RAM 2 has been read out, a notification signal is sent from the notification means 9 to notify that the recordable state has been reached.

Hereinafter, a specific example will be explained based on one embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.

The audio signal supplied to the input terminal 1N is passed through the A/D converter 11 through a low-pass filter 14 for removing aliasing noise caused by sampling.
and converts it into audio signal data.

Further, the analog signal output from the D/A converter 13 is passed through a low-pass filter 16 to an output terminal.
Send to OUT.

On the other hand, 20 is a microcomputer, which basically includes a CPU 21, ROM 22, RAM 23 including RAM 2, a programmable timer 26,
Consisting of an input port 24 and an output port 25, the output of a so-called VOX circuit 15, which is an audio signal detection circuit that detects the presence or absence of an audio signal by receiving the audio signal supplied from the input terminal IN, and the reproduction number setting device 17. setting data and A/D converter 11
The audio signal data output from the input port 24
It is supplied to A program to control the CPU 21 is written in the ROM 22, and the CPU 21
According to the program in the ROM 22, the output of the audio signal detection circuit 15, the setting data of the playback number setting device 17, and the A/D converter 11 are sent via the input port 24.
When necessary, the audio signal data is read in, stored in the RAM 23 or a register, exchanged, judged, calculated, compared, set the time of the timer 26, performs predetermined processing when the set time of the timer 26 has elapsed, etc. According to this process, the A/
A conversion instruction signal is sent to the D converter 11, and the D/A converter 1
3, the conversion instruction signal and the stored audio signal data,
Each drive signal is sent out to drive a low frequency oscillator 18 for generating a notification sound.

FIG. 3a is a circuit diagram showing an example of the audio signal detection circuit 15.

The audio signal detection circuit 15 includes an amplifier 15A consisting of an operational amplifier 30, capacitors 31, 35, and resistors 32, 33, 34, diodes 37, 38,
The rectifier circuit 15B includes capacitors 36, 39 and a resistor 40, and rectifies the output voltage of the amplifier 15A by voltage doubler.

The audio signal detection circuit 15 sends the audio signal to the amplifier 15.
A, and the audio signal amplified by the amplifier 15A is voltage doubled and rectified by the rectifier circuit 15B, and then output. Therefore, when the audio signal detection circuit 15 is supplied with an audio signal having a waveform as shown in FIG. 3b, for example,
This is detected and an output as shown in FIG. 3c is generated. Here, the amplifier 15A and the rectifier circuit 15B
Due to the presence of a detection delay due to the time constant of
As shown in the figure, even if the audio signal is interrupted within a predetermined period, the output is not inverted and the audio signal detection output is generated.
In this embodiment, the audio signal detection circuit 15 is used as the recording instruction means 4. However, a switch may be used in place of the audio signal detection circuit 15. In this case, one contact of the switch is connected to the power supply +B via a pull-up resistor, the other contact is grounded, and the output from the movable piece is It may be supplied to the input port 24, and in this case, when the output from the movable piece of the switch is at a high potential, a recording instruction is issued.

The operation of one embodiment of the present invention constructed as described above will be explained with reference to the flowchart shown in FIG.

When the program written in the ROM 22 is operated, initial settings are first made (step a). In the initial setting, at least 2 RAM
The first address value and [final address value +1] of the audio signal data storage area are stored in a predetermined area outside the audio signal data storage area No. 3. Following completion of the initial settings, a drive signal is output to the low frequency oscillator 18 (step b). By executing step b, the low frequency oscillator 18 outputs an oscillation output, that is, a notification audio signal for the duration of the drive signal.
This notification sound signal is reproduced, and the notification sound notifies that the recording is possible. Following step b, the program waits for an instruction to start recording from the audio signal detection circuit 15, that is, waits for the output of the audio signal detection circuit 15 to become high potential (step c). When the audio signal is supplied and the output of the audio signal detection circuit 15 becomes high potential, the first address value and the [final address value +1] stored in the RAM 23 in the initial settings are copied to the registers u and v, respectively ( The copy is hereinafter referred to as transfer) (step d). Following step d, a conversion instruction signal is output to the A/D converter 11 (step e). A/D converter 1 that receives this conversion instruction signal
1 samples the audio signal supplied through the low-pass filter 14 and converts it into audio signal data. Then, the audio signal data converted by the A/D converter 11 is stored as specified by the register u.
Write to the address of RAM23 (step f),
Subsequently, the contents of register u are incremented by "+1" (step g). The contents of register u and the contents of register v are compared to detect a match (step h).
In step h, it is detected whether the audio signal data has been written to the entire audio signal data storage area of the RAM 23. step h
When [contents of register v>contents of register u], it is detected whether the output of the audio signal detection circuit 15 is at a high potential (step i), and step i is performed.
When the output of the audio signal detection circuit 15 is at a high potential, the audio signal is still being detected, and following step h, steps e to i are performed until [the contents of register v = the contents of register u].
Execute repeatedly.

In step h, if [contents of register v = contents of register u], the audio signal data is stored in the RAM.
This means that all 23 audio signal data storage areas have been written, and the loop of steps e to i is exited.

When exiting from the loop of steps e to i in step h, if it is detected in step i that the output of the audio signal detection circuit 15 is at a low potential, that is, the recording instruction has ended, the process proceeds to step h,
Following step i, the timer 26 is set and the set time is waited for (step j). When the set time of the timer 26 has elapsed, the setting data of the playback number setter 17 is written in a predetermined area of the RAM 23 other than the audio signal storage area, and then the written setting data of the playback number setter 17 is transferred to the register w ( Step k). Following step k, the first address value of the audio signal data storage area stored in the RAM 23 is transferred to the register u as the first address value at the time of reproduction to set a reproduction address (step l). Following step 1, the audio signal data stored at the address specified by the contents of register u is read out (step m), and a conversion instruction signal is then output to the D/A converter 13 (step n). The D/A that received this conversion instruction signal
The converter 13 reads the audio signal data read out in step m into a register within the D/A converter 13, converts it into an analog signal, and outputs it to the output terminal OUT via the low-pass filter 16.

Following step n, the contents of register u are incremented by "+1" (step p). Next, the contents of register u and register v are compared to detect a match (step q). In step q
It is detected whether all the audio signal data stored in the audio signal data storage area of the RAM 23 has been read out. If in step q, [contents of register v>contents of register u], following step p, steps m to q are repeated until [contents of register v=contents of register u]. When [the contents of register v = the contents of register u] in step q, all the stored contents in the audio signal data storage area of the RAM 23 have been read out and reproduced, and in steps m to
Break out of the loop of q. When exiting the loop from steps m to q, the contents of register w are set to “-”.
1", steps l to r are repeated until the contents of register w become zero, and when the contents of register w become zero, the process exits from the loop of steps l to r and returns to step b (step r). Therefore, when exiting from step r, reproduction has been repeated the number of times specified by the setting data of the reproduction number setting device 17.Step r
When the process returns to step b and step b is executed, the drive signal is outputted to the low frequency oscillator 18 again. Therefore, while the drive signal is being generated again, the low frequency oscillator 18 oscillates for the duration of the drive signal and outputs the notification sound signal. This notification sound signal is reproduced to notify that recording is possible, and then, in step c, the next recording start instruction is awaited.

In the embodiment of the present invention described above, a case has been exemplified in which the low frequency oscillator 18 is provided to notify that recording can be started. The notification sound data obtained by A/D converting the notification sound signal is stored in a predetermined area in the RAM 23 outside the audio signal data storage area, and is read out in step b, and converted into an analog signal by the D/A converter 13. It may be converted to

Further, in the embodiment of the present invention described above, the case where step j is provided is illustrated, but step j may be omitted and the execution proceeds from steps h and i to step k. In this case, the recording ends. Reproduction will continue from then on, so the timer 26 can be omitted. Also, if you always want to play only once, use the playback count setter 1.
7. Steps k and r may be omitted; in this case, it is sufficient to return to step b when [contents of register v = contents of register u] in step q.

As described above, according to the present invention, recording and playback can be performed without requiring operations such as rewinding the magnetic tape and instructing playback, unlike conventional magnetic recording and playback devices.

Further, the fact that recording is now possible is notified not by a visual display such as a light emitting diode, but by a notification sound. Therefore, the user can concentrate on practicing pronunciation while viewing the text without being distracted by the visual display.

[Brief explanation of the drawing]

Figure 1 is a functional block diagram of the present invention. FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 3a is a circuit diagram showing an example of an audio signal detection circuit. Third
Figures b and c are waveform diagrams for explaining the operation of the audio signal detection circuit shown in Figure 3a. FIG. 4 is a flowchart for explaining the operation of one embodiment of the present invention. 1...A/D conversion means, 2...RAM, 3...
D/A conversion means, 4... Recording instruction means, 5... Writing control means, 6... Recording capacity storage means, 7...
. . . Readout control means, 8 . . . Reproduction start time determination means, 9 . . . Notification means, 15 .

Claims (1)

[Scope of utility model registration request] A/D conversion means for converting an input analog signal into a digital signal, a readable/writable storage means for storing the output of the A/D conversion means, and converting the digital signal read from the storage means into an analog signal. a D/A conversion means for instructing recording, a recording instructing means for instructing recording, and detecting that a recording instruction has been issued by the recording instructing means, and sequentially instructing the storage means to write the output of the A/D converting means. a write control means, a recording capacity storage means for storing the recordable capacity of the storage means, a read control means for sequentially instructing to read out the storage contents of the storage means, a written capacity of the storage means and the recording capacity storage When the recordable capacity stored in the means matches, or when the recording instruction by the recording instruction means is no longer given, a playback start timing at which the write instruction by the write control means is ended and the read instruction by the read control means is started. 1. A recording and reproducing device comprising: a determining means; and a notifying means for notifying that the state is ready for recording.