JPH10106163A - Information reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information reproducing device which allows a stable reduction of power consumption at the time of reading out the information data temporarily stored in an internal memory. SOLUTION: This information reproducing device for reproducing the information data recorded in a minidisk 1 with a high speed, temporarily storing it in a shock-proof memory 6 and reproducing the information data recording in the memory 6 with a low speed is provided with power source voltage detecting circuits 18, 19 which detect the voltages of power sources 22, 23. A power source ON/OFF circuit 15 is installed so that, when the voltages of the power sources 22, 23 detected by the circuits 18, 19 are within a predetermined range, the supply of power source voltage to this recorded information readout circuit is controlled during the quiescent period of the recorded information readout circuit which reads out the information data recorded in the minidisk 1 for the purpose of controlling the power consumption in the recorded information readout circuit and also preventing a malfunction due to the transient characteristics in the case of supplying a specified voltage again to the recorded information readout circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mini-disc device (hereinafter referred to as a mini disc device) which compresses information data such as audio data on a time axis, reads out the data from a recording medium such as a disk which has been digitally recorded, extends the time axis, and reproduces the data. , MD devices).

[0002]

2. Description of the Related Art In an MD device, audio data is read out from a disk in which audio data is compressed in a time axis and digitally recorded, the data is expanded in a time axis, and this is converted from digital to analog and reproduced. In the case of this MD device, audio data is normally read from a disk at a speed of 1.4 Mbit / sec, and decompression is performed at a speed of 0.3 Mbit / sec.

Therefore, in this MD device, in order to absorb the difference between the data reading speed of the pickup and the sending speed of data reproduced by extending the time axis,
The time-axis-compressed audio data read from the disk is temporarily stored in a semiconductor memory, from which data is read at a rate of 0.3 Mbit / sec and reproduced.

Further, in this MD apparatus, the time-axis-compressed audio data read from the disk is read by utilizing the difference between the data reading speed of the above-described pickup and the sending speed of the data to be reproduced by expanding the time axis. Is always stored in the semiconductor memory at a predetermined data amount or more. By doing so, even if a disturbance such as vibration is applied to the main body, and the pickup deviates from the correct track, if the pickup is returned to the correct track before the data in the semiconductor memory runs out, the reproduction sound is not interrupted. can do.

The above-mentioned semiconductor memory is a so-called shock-proof memory, and a conventional MD device usually uses a 4-Mbit D-RAM. During playback, this shock-proof memory has a part of its capacity acting as a WORKRAM for absorbing the difference in the data transfer speed of data input / output to / from the memory, and the rest of the capacity for the shock and track jump described above. For shock proofing.

That is, when the shock proof memory is a 4-Mbit D-RAM, the difference in processing speed between reading audio data from the disk and expanding the time axis is 1.1M.
bit / sec., and after about 4 seconds (4 Mbit / 1.1 Mbit / sec ⁻¹ ) from the start of reading the audio data from the disk, the stored data becomes full in memory capacity and the reproduction time is about 11 seconds ( 4Mbit / 0.3Mbit / sec- ¹ ) data is stored.

Therefore, when the storage data becomes full, the sound data read from the disk is not stored in the shock proof memory for a predetermined time after that, and only the data is read from the memory. .
As a result, an empty area is created in a part of the capacity of the shock proof memory, so that the audio data read out from the disk is sequentially stored again in the empty area, and when the storage data is full, the audio data is re-entered. A blank read of the disc is performed for a predetermined time, and the same operation is repeated thereafter.

On the other hand, in a portable MD device which is easy to carry, when the MD device is used in a portable manner, a rechargeable battery or a dry battery is usually used as a power source. In this case, the time during which the battery can be used continuously without replacing the battery is limited. Therefore, it is desired that the power consumption be reduced as much as possible and the battery can be used for a long time.

For this reason, for example, Japanese Patent Laid-Open No. 5-342585
The following technology is disclosed in Japanese Unexamined Patent Application Publication No. HEI 9-86. Recorded information reading means (for example, pickup, RF
An amplifier, a decode / signal processing circuit, a servo circuit, a driver circuit, a spindle motor, a feed motor, etc.) and a storage in which an area for storing information data read by the recording information reading means is formed. Means (for example, a 4 Mbit D-RAM), and temporarily writes the information data read by the recording information reading means into the storage means, and stores the information data from the storage means at a speed lower than the writing speed. An information reproducing apparatus such as an MD apparatus that reads out and reproduces information by expanding the information data on a time axis, wherein switching means for switching whether or not power is supplied from a power supply such as a battery to the recorded information reading means; When the storage amount of the information data in the storage means substantially reaches the storage capacity of the storage means, power supply to the recorded information reading means is performed. Control means for controlling the switching operation of the switching means so that the stored information is not read out when the storage amount of the information data in the storage means becomes a predetermined amount or less. The switching operation of the switching means is controlled so that the supply of power to the means is resumed, and before the information data in the storage means becomes empty, the writing of the information data to the storage means is restarted. I have.

In addition, there are provided switching means for switching whether or not power supply to the recorded information reading means is supplied, and mode selecting means for selecting one of the first mode and the second mode. When the first mode is selected by the mode selection means, the control means supplies power to the recording information reading means when the storage amount of the information data in the storage means substantially reaches the storage capacity of the storage means. When the switching operation of the switching unit is controlled so as not to be performed, and the storage amount of the information data in the storage unit becomes equal to or less than a predetermined amount,
The switching operation of the switching unit is controlled so that the supply of power to the recording information reading unit is restarted, and the operation of the writing unit is controlled to restart the writing of the information data to the storage unit. When the second mode is selected by the means, the operation of the writing means is controlled so that the shock proof information data is always held in the storage means at a predetermined amount or more.

[0011]

However, in a portable MD device using a battery as a power supply, the voltage of the power supply is checked during operation, and when the voltage falls below a preset voltage value, the operation of the device is stopped. The playback ends. Therefore, when the storage amount of the information data in the storage unit substantially reaches the storage capacity of the storage unit as in the technique disclosed in Japanese Patent Application Laid-Open No. 5-342585, the power supply power to the recording information reading unit is reduced. The switching operation of the switching unit is controlled so that the supply is not performed. When the storage amount of the information data in the storage unit becomes equal to or smaller than a predetermined amount, the switching is performed so that the supply of the power to the recording information reading unit is restarted. In the case of controlling the switching operation of the means, and controlling the operation of the writing means to restart the writing of the information data to the storage means, the supply of the power supply to the recording information reading means is restarted, When the pickup actuator, spindle motor, and drive circuit start operating, a transient peak current occurs, causing the power supply voltage to temporarily decrease and fall below the playback stop set voltage. , When such a problem arises in that the end of the reproduction operation.

[0012]

According to a first aspect of the present invention, there is provided an information reproducing apparatus for reading out information data from a recording medium on which time-axis-compressed information data is digitally recorded. Information reading means, and storage means for storing the information data read by the recorded information reading means, wherein the information data read from the recording medium is temporarily written to the storage means, and a speed lower than the writing speed. An information reproducing apparatus for reproducing the information by extending the information data read out from the storage means on the time axis, a switching means for switching supply of power to the recorded information reading means, and a storage means stored in the storage means. When the storage amount of the information data substantially reaches the storage capacity of the storage means, the switching means controls the supply of power to the recording information reading means. Control means for controlling the switching means so that when the information amount of the information data in the storage means becomes equal to or less than a predetermined amount, the power supply to the recording information reading means is set to a steady value. An information reproducing apparatus for restarting the writing of the information data to the storage means before the information data in the storage means becomes empty; and a voltage detection means for detecting a voltage of a power supply for driving the apparatus. The switching operation of the switching unit is controlled only when the voltage value obtained by the voltage detecting unit is within a predetermined range set in advance.

According to the configuration of the first aspect, the information data read from the recording medium by the recording information reading means is temporarily written into the storage means, and is read out from the storage means at a speed lower than the writing speed. Will be played. Therefore,
Due to the difference between the writing speed and the reading speed, information data is accumulated in the storage means. Only when the voltage value obtained by the voltage detecting means for detecting the voltage of the power supply for driving the device is within a preset range, the control means controls the power supply power to the recording information reading means. The switching means is switched so that the supply is not performed. As a result, the storage of the information data in the storage means is temporarily interrupted, and only the reading of the data is performed. In this case, unlike the case of the idle reading, the supply of the power supply to the storage information reading means is stopped, so that the power consumption of the apparatus is reduced as compared with the normal reproduction.

If the reproduction is performed in the above state, the storage amount of the information data in the storage means decreases with time, and after a predetermined time, the information data in the storage means becomes empty. When the storage amount of the information data in the storage unit becomes equal to or less than a predetermined amount, the switching operation of the switching unit is controlled so that the supply of the power supply to the recording information reading unit is restarted. Before the data becomes empty, the writing of the information data to the storage means is restarted. Thus, the information data is stored again in the storage means, and the reproduction operation is not interrupted.

When the voltage value obtained by the voltage detecting means is out of the preset range, the control of the switching operation is stopped. As a result, although the device is still operable due to a temporary drop in power supply voltage due to a transient current or the like when the power supply to the recording information reading means is restarted as in the prior art, a rechargeable battery, a dry battery, etc. It is possible to prevent the reproduction operation or the operation of the apparatus from being stopped by judging that the power supply has been exhausted.

According to a second aspect of the present invention, there is provided an information reproducing apparatus comprising: a recording information reading unit for reading information data from a recording medium on which time-axis-compressed information data is digitally recorded; A storage unit for storing the read information data is provided, and the information data read from the recording medium is temporarily written to the storage unit,
A time-expanding information axis read from the storage means at a speed lower than the writing speed, and an information reproducing apparatus for reproducing information; a switching means for switching supply of power to the recorded information reading means; 1st mode or 2nd mode
Mode selection means for selecting any one of the setting modes, wherein when the first mode is selected by the mode selection means, the value obtained from the voltage detection means of the power supply for driving the device is Only within the set range, if the storage amount of the information data stored in the storage means has substantially reached the storage capacity of the storage means, the supply of power to the recorded information reading means is controlled. Controlling the switching means, and when the storage amount of the information amount data in the storage means becomes equal to or less than a predetermined amount, the switching means controls the supply of the power supply to the recording information reading means to a predetermined value. Controlling the operation of the writing means for writing the information data read from the recording information reading means to the storage means at the same time to restart the writing of the information data to the storage means. When the second mode is selected by the means, a control means for controlling the operation of the writing means is provided so that the shock proof information data in the storage means is always held at a predetermined amount or more. And

Therefore, according to the configuration of the second aspect, in addition to the configuration of the first aspect, there is provided a mode selecting means for selecting one of the first mode and the second mode. When the first mode is selected by the mode selecting means and the voltage value obtained by the power detecting means is within a preset range, the power of the recording information reading means is turned on / off as in the configuration of claim 1. Are repeated to reduce power consumption during reproduction. That is, at this time, the power save mode is set.

On the other hand, when the second mode is selected by the mode selection means, the control means writes the shock proof information data in the storage means such that the capacity of the storage means is almost full at all times. Control the operation of. That is,
If the second mode is selected, the storage means is used as a full shock proof mode.

According to a third aspect of the present invention, in the information reproducing apparatus according to the second aspect, the mode selecting means can arbitrarily select one of the first mode and the second mode. It is a switch.

As described above, according to the selection result of the mode selection means, the storage means is switched between the power save mode and the full save mode.
It can be used by switching to a shock proof mode. As described in claim 3, if a manual switch is used as the mode selection means, the user can arbitrarily select a setting mode according to the purpose. For example, when using an information reproducing apparatus using a battery as a power source, selecting the first mode enables long-term use.

However, if the battery voltage deviates from a predetermined value due to the consumption of the battery, the second mode is automatically set even if the mode selecting means is selected in the first mode, and the power of the storage information reading means is changed. It is possible to prevent the operation of the apparatus from being stopped due to a transient phenomenon such as ON / OFF. On the other hand, by selecting the second mode, since the data is written almost completely in the storage means, it is possible to prevent the reproduction information from being disturbed due to disturbance or the like.

According to a fourth aspect of the present invention, in the information reproducing apparatus according to the second aspect, the mode selecting means is adapted to select the first mode or the second mode in accordance with a state of reading the information data by the recording information reading means. It is an automatic mode selecting means for automatically selecting any one of the setting modes.

When the mode selecting means is an automatic mode setting means, the setting mode can be automatically selected according to the state of reading of the information data by the recording information means. For example, the automatic mode selection means has few errors, has a long error cycle, and has little fluctuation in the servo voltage. Therefore, if it is determined that the shock proof capacity may be small, the first mode is selected. If it is determined that the capacity for shock proof must be large because there are many errors, the error cycle is short, or the fluctuation of the servo voltage is large, the second mode is selected.

That is, in the prior art, even when the number of errors is small, the storage means is almost always filled with the information data for shock proof. However, the automatic mode selection means stores the data if the number of errors is small. Since the means is used for power saving, power consumption can be reduced accordingly.

According to a fifth aspect of the present invention, in the information reproducing apparatus according to the second aspect of the present invention, a power supply means for supplying power to the apparatus from a plurality of power supplies, and detecting a voltage of each power supply of the power supply means. And a power supply selecting means for automatically selecting a power supply having the highest voltage based on the voltage value obtained from the voltage detecting means. When the mode selecting means selects the second mode, The operation of the writing means is controlled such that the information data for shock proof in the storage means is always kept at a predetermined amount or more.

Therefore, according to the fifth aspect of the present invention, power can be supplied from a plurality of power supplies, and the highest voltage can be obtained by the voltage value obtained by the voltage detecting means for detecting the voltage of each power supply. You can automatically select the power source you have. In this case, since the apparatus can withstand a long operation by using a plurality of power supplies, the mode selection can be fixed to only the second mode, and the disturbance of the reproduction information due to disturbance or the like can be prevented.

According to a sixth aspect of the present invention, in the information reproducing apparatus according to the second aspect of the present invention, a power supply means for supplying power to the apparatus from a plurality of power supplies, and a voltage of each power supply of the power supply means is detected. And a power supply selecting means for automatically selecting a power supply having the highest voltage based on the voltage value obtained from the voltage detecting means, and a power supply voltage when the apparatus is operated by the power supply selected by the power supply selecting means. The fluctuation is detected by the voltage detecting means, and when the power supply voltage fluctuation width exceeds a preset value, only when the mode selecting means drives the apparatus using the selected specific power supply, The second mode is automatically selected, and when the power supply voltage fluctuation width is within a set value, the mode selecting means selects the first mode.

Therefore, according to the present invention, power can be supplied from a plurality of power supplies, and the power supply having the highest power supply voltage can be determined based on the voltage value obtained by the voltage detecting means for detecting the voltage of each power supply. Can be selected automatically. In this case, if the power supply voltage fluctuation width during device operation by the selected power supply exceeds a preset value, the mode selection means sets the selection mode to the second mode, and if the power supply voltage width is within the set value, , The first mode is selected.

As a result, in the case of a power supply having a large internal impedance, the power supply operates in the second mode, and the supply voltage of the storage information reading means due to transient phenomena such as when the power supply is turned on / off or when the servo is started up. Due to large fluctuations,
It is possible to prevent the operation from becoming unstable or to stop the operation of the apparatus. In the case of a power supply having a small internal impedance, the power consumption can be reduced by setting the first mode.

[0030]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an embodiment in which the information reproducing device of the present invention is applied to an MD device. As shown in FIG. 1, time axis compressed audio data (information data)
The recording information reading means for reading the audio data from the mini disk 1 on which the digital data is recorded is a pickup 2, an RF amplifier 3, a decoder / signal processing circuit 4, a servo circuit 11, a driver circuit 12, a spindle motor 13
And a feed motor 14. At the time of reproduction, the mini disc 1 is rotated by a spindle motor 13 driven by a driver circuit 12, and the pickup 2 is fed in the radial direction of the mini disc 1 by a feed motor 14 driven by the driver circuit 12. The pickup 2 reads out audio data recorded on the mini disc 1. The audio data read by the pickup 2 is amplified by the RF amplifier 3 and
The signal is sent to the decoder / signal processing circuit 4.

The RF amplifier 3 focuses the audio data read from the pickup 2 on the focus data.
A servo control signal such as an error signal and a tracking error signal is generated and output to the servo circuit 11. The servo circuit 11 performs servo of focus, tracking, and spin by a servo control signal from the RF amplifier 3 and a control signal from a system control microcomputer (hereinafter, referred to as a system control microcomputer) 10. Like putting
The driver circuit 12 is controlled. The driver circuit 12 controls the pickup 2 and the feed motor 14 according to a control signal from the servo circuit 11.
And the spindle motor 13 is driven.

The decoder / signal processing circuit 4 demodulates the signal amplified by the RF amplifier 3, further performs signal processing such as error correction, and outputs the processed signal to a shock as writing means and memory reading means. A proof memory controller (hereinafter abbreviated as a memory controller) 5
Send to The memory controller 5 serves as a writing unit.
The signals sent from the decoder / signal processing circuit 4 are sequentially written into a shock proof memory 6 as a storage means. In this embodiment, a 4-Mbit D-RAM is used as the shock proof memory 6.

Further, the memory controller 5 reads out the audio data stored in the shock proof memory 6 as a memory reading means at a rate of 0.3 Mbit / sec and sends the data to the audio decompression circuit 7. The audio decompression circuit 7 decompresses the transmitted data by decompressing the time axis according to a predetermined format, and sends the data to the D / A converter 8. The D / A converter 8 converts the transmitted digital signal into an analog signal to generate an audio signal. And
This audio signal passes through a volume control and amplifier circuit 9,
The sound is output from the headphones 21.

The system control microcomputer 10 includes a power supply A (for example, a built-in lithium ion battery) 22 detected by the power supply voltage detection circuit A18 and a power supply B (for example, an AC adapter or a dry battery) detected by the power supply voltage detection circuit B19. 23) Input the voltage of 23, determine which power supply to use, send a select signal to the power supply input switching circuit 17, and supply power to the power supply circuit 16 from the selected power supply. The power supply circuit 16 is constituted by a DC-DC conversion circuit or the like, and supplies a necessary voltage to each unit so that the device can be operated. The power supply circuit 16 also supplies power to the power ON / OFF circuit 15.

Further, the pickup 2 reads out audio data stored in the mini disk 1 at a rate of 1.4 Mbit / s, while the audio expansion circuit 7 reads out audio data at a rate of 0.3 Mbi / s.
It is configured to decompress the time axis at speed t. That is, the difference between the processing of reading the audio data from the minidisk 1 and the processing of expanding the time axis is 1.1 Mbit / s, and the time axis compression is released to the shock proof memory 6 by the difference in processing speed. The previous data will be stored.

In the case of this embodiment, the shock proof
Since the memory 6 is 4 Mbit, the capacity of the shock proof memory 6 is smaller than that of the mini disk 1 by the pickup 2.
After the start of reading data from the memory, the memory capacity becomes full in about 4 seconds, and data for about 12 seconds in reproduction time is stored.

When the sound data in the shock proof memory 6 becomes full as described above, the MD apparatus uses the power save mode as the first mode or the shock mode as the second mode. Depending on which of the proof modes is set, different reproduction operations are performed thereafter.

The above-mentioned shock proof mode is a normal reproduction mode conventionally performed, and in this case, the above-mentioned shock proof memory 6 is used for shock proof. On the other hand, the power save
In this mode, the shock proof memory 6 is used not only for shock proofing but also for power saving for reducing power consumption.

The present MD apparatus is provided with a power ON / OFF switch as a switching means for switching whether or not power is supplied to the pickup 2 and the RF amplifier 3 constituting the recorded information reading means.
It has an OFF circuit 15. The power supply ON / OFF circuit 15 includes a system control unit as a control unit.
The system control microcomputer 10 is operated by a control signal from the microcomputer 10.
A power save switch 20, which can be set to a power save mode by a user operation, is connected.

Then, the power save switch 2
When 0 is ON, the system control microcomputer 10 automatically selects the power save mode if conditions such as detection values from the power supply voltage detection circuits A and B are satisfied. If the conditions are not satisfied, a shock proof mode is selected.

On the other hand, when the power save switch 20 is
When FF is set, the system control microcomputer 10 forcibly selects the shock proof mode. First, the case where the shock proof mode is set will be described below.
When the sound data in the shock proof memory 6 becomes full, the system control microcomputer 10 stores the sound data read from the mini-disc 1 by the pickup 2 for a predetermined time thereafter. Then, the memory controller 5 is controlled so as not to store the data in the mini disk 1, and the mini disk 1 is read idle.

Therefore, during this period, only data is read from the shock proof memory 6 at a speed of 0.3 Mbit / sec, and an empty area is created in a part of the capacity of the shock proof memory 6. After the predetermined time,
The system control microcomputer 10 causes the pickup 2 to jump to a track before the capacity of the shock proof memory 6 becomes full, and the sound data read from the mini disk 1 by the pickup 2 is transferred to the shock proof memory 6. The memory controller 5 is controlled to store the data in the memory 6.

After that, when the sound data in the shock proof memory 6 is full again, the disk is read idle for a predetermined period of time, and the same operation is repeated. As described above, shock proof data is always secured in the shock proof memory 6.

Next, the case where the power save mode is set will be described below. When the sound data in the shock proof memory 6 is full, the system control microcomputer 10 turns off the power of the pickup 2 and the RF amplifier 3 and turns on / off the power so as to cut off the power supply. The circuit 15 is controlled.

Further, the system control microcomputer 10 sets the decoder / signal processing circuit 4 and the servo circuit 11 in the low power consumption mode, and, unlike the servo ON state, sets the spindle motor 13 to a state of simply rotating the spindle motor 13 roughly. . Power is supplied to the feed motor 14 and the actuator of the pickup 2 from the servo circuit 11 by the driver circuit 12.
In this case, the output may be controlled to be turned off (no power supply). Further, in some cases, rough rotation of the spindle motor 13 may not be performed.

As a result, the operation of storing the sound data in the shock proof memory 6 is temporarily interrupted, and the operation of storing the sound data in the shock proof memory 6 is stopped at a time of 0.1 second.
Data is read from the shock proof memory 6 at a speed of 3 Mbit, and reproduced as an audio signal. In this case, unlike the idle reading of the mini-disc 1, the power of each component of the recording information reading means is OFF or in the low power consumption mode, so that the power consumption of the apparatus is naturally reduced compared to the normal reproduction. You.

If the reproduction is performed in the above state, the data in the shock proof memory 6 becomes empty after a lapse of a predetermined time (ie, about 12 seconds). The system control microcomputer 10 controls the power supply ON / OFF circuit 15 so that the power supplies of the pickup 2 and the RF amplifier 3 are turned on. In addition, the system
The control microcomputer 10 releases the low power consumption mode of the decoder / signal processing circuit 4 and the servo circuit 11.
As a result, the reading of the audio data from the mini-disc 1 is restarted, the audio data is stored again in the shock proof memory 6, and the reproduction operation is not interrupted.

Next, the operation of this apparatus will be specifically described with reference to the flowchart shown in FIG. First, power supply A-2
In step s1, the power supply voltage detection circuit A.1 is selected to determine which of the power supply 2 and the power supply B.23 is to be used.
In step s2, the voltage of the power supply A23 is confirmed by the power supply voltage detection circuit B19 in step s2. In step 3, it is checked whether the power supply input switching circuit 17 is connected to the power supply A or B.
If 18 is connected, that is, selected, the process proceeds to step s4; otherwise, the process proceeds to step s5.

In step s4, the power supply voltage detection circuit A
18, the voltage of the power supply A · 22 obtained from the power supply voltage detection circuit B · 19 is higher than that of the power supply B · 23 by V
Compare whether it is higher than β, and if so, step s
To 6, and if not, to step s7. On the other hand, in step s5, it is determined whether the voltage of the power supply B · 23 obtained from the power supply voltage detection circuit B · 19 is higher than the voltage of the power supply A · 22 obtained from the power supply voltage detection circuit A · 18 by Vα or more. Compare, and if so, go to step s7, otherwise go to step s6. In step s6, the power supply A
In step s7, the power supply input switching circuit 17 is switched so as to select the power supply B · 23, and either power supply is connected to the device.

In step s8, the selected power supply voltage V
_i is reconfirmed by the power supply voltage detection circuit 18 or 19, and it is compared whether it is equal to or higher than the operation stop voltage _{Vstop of the} device,
If it is lower than _Vstop , the operation of the device is stopped. V _stop
In the above case, the process proceeds to step s10. In step s10, the power save switch 20 is set to the power save mode.
It is confirmed whether the mode is set or not. If the mode is the power save mode, the process proceeds to step s11. Otherwise, the process proceeds to step s15.

[0051] At step s11, the voltage of the power supply the selected confirms whether within a preset voltages V ₁ or V ₂ less. For example, V ₁ = 3.3 V, V ₂ = 4.
In the case of 0V, only if the V _i is within this range is the power save mode allowed. Otherwise, step s
Proceed to 15.

In step s12, the power supply voltage fluctuation width due to the load fluctuation when the power supply is operating is confirmed, and in step s13, it is compared whether the fluctuation width is equal to or less than ΔV,
If it is equal to or less than V, the process proceeds to step s14 to perform a power save operation. If it is larger than ΔV, that is, if the internal impedance of the power supply is larger than the value determined by ΔV, in order to prevent the set from becoming unstable at the time of transition such as when the servo is turned on in the power save operation, a shock proof operation is performed in step s15. To do. In step s16, it is checked whether a predetermined time (for example, 100 ms) has elapsed, and if it has elapsed, the process returns to step s1. By doing so, a safe and power-saving operation can be performed.

Next, the shock proof operation will be described with reference to the flowchart shown in FIG. At step m1, the power ON / OFF circuit 15 is turned on, the servo circuit 11 is started, and at step m2, the recorded information recorded on the mini disc 1 is read. In step m3, it is confirmed whether or not the recording capacity of the shock proof memory 6 is full.

If the capacity is not full, the flow returns to step m2. Step m4 when the capacity is full
To stop the reading of the recorded information of the mini disc 1 by the pickup 2. In step m5, it is checked whether the recording capacity of the shock proof memory 6 has become smaller than X (for example, for 10 seconds), and if it has become smaller, the process returns to step m2.

If not, step m6
To perform a blank reading of the recorded information, and return to step m5 to check the capacity of the shock proof memory 6. As a result, the shock proof memory 6 always stores information data such as music of X or more (for example, 10 seconds or more).

FIG. 4 is a flowchart showing the operation in the power save mode. In step n1, the power ON / OFF circuit 15 is turned on, and the servo circuit 11 is started. At step n2, the recorded information recorded on the mini disc 1 is read. In step n3, it is confirmed whether or not the capacity of the shock proof memory 6 is full, and if not, the process returns to step n2.

If the capacity is full, step n4
To stop reading the record information. Step n5
Then, the servo operation by the servo circuit 11 is released, the output of the power ON / OFF circuit 15 is turned off, and the power supply to the pickup 2 and the RF amplifier 3 is stopped.

In step n6, a shock proof
Since information data such as music data is read from the memory 6, the amount of memory is reduced. Therefore, it is checked whether the memory amount has become smaller than Y. If the value is less than Y (for example, if the remaining time is less than 4 seconds), the process returns to step n1, and the servo operation by the servo circuit 11 is started again to restart reading the recorded information.

In the flowchart shown in FIG. 2, a plurality of high power supplies are selected, and a power save operation is performed according to the setting of the power save mode.
When a plurality of power supplies are connected to the apparatus, only the shock proof operation is performed after selecting which power supply to connect as described in (1).

If only one power supply is connected,
That is, in the example of FIG. 1, when only one of the power supply A and the power supply B is connected and the detection result of either the power supply voltage detection circuit A or the power supply B becomes 0 V, the power save switch If the condition is satisfied when the power saving mode is set to the power saving mode, the power saving operation may be performed.

The power ON / OFF circuit 15 controls only the pickup 2 and the RF amplifier 3.
The power supply may also be controlled to the driver circuit 12 and the servo circuit 11. In this embodiment, a 4Mbit shock proof memory is used. However, the capacity of the shock proof memory is not limited to this, and the power saving operation is performed by using a larger capacity. Thus, an effect of further reducing power consumption can be obtained.

[0062]

According to the first aspect of the present invention, there is provided an information reproducing apparatus comprising:
Switching means for switching whether or not to supply power to the recording information reading means; and supply of power to the recording information reading means when the storage amount of information data in the storage means substantially reaches the storage capacity of the storage means. Control means for controlling the switching operation of the switching means, and voltage detecting means for detecting the voltage of a power supply for driving the device, so that the voltage value obtained by the voltage detecting means is a predetermined value. Only when the data amount is within the range, when the storage amount of the information data in the storage unit reaches the recording capacity, the control unit does not supply the power to the recording information reading unit, and When the storage amount becomes equal to or less than the predetermined amount, the switching operation of the switching unit is controlled so that the supply of power to the recording information reading unit is restarted. , A configuration to resume writing information data to the unit.

Therefore, within the range of the power supply voltage at which the apparatus can stably operate even transiently, the power supply of the recording information reading means is turned on / off, and the servo circuit and the driver circuit are shifted to the low power consumption mode. Since information is reproduced while being repeated, it is possible to reduce the power consumption of the device during reproduction.

According to a second aspect of the present invention, there is provided an information reproducing apparatus, comprising: switching means for switching whether or not power supply to the recorded information reading means is supplied; voltage detecting means for detecting a supply voltage of the power supply of the apparatus; Or a mode selecting means for selecting any one of the setting modes of the second mode, wherein when the first mode is selected by the mode selecting means, the control means controls the power supply voltage obtained from the voltage detecting means to a predetermined value. When the storage amount of the information data in the storage unit substantially reaches the storage capacity of the storage unit, the switching of the switching unit is controlled so that the power supply to the recording information reading unit is not performed. Then, the servo circuit and the driver circuit are set to the low power consumption mode, and when the storage amount of the information data in the storage unit becomes a predetermined amount or less, the supply of the power supply to the recording information reading unit is restarted. As described above, while the switching operation of the switching unit is controlled and the operation of the writing unit is controlled to restart the writing of the information data to the storage unit, when the second mode is selected by the mode selection unit, the storage operation is performed. The operation of the writing means is controlled so that the shock proof information data is always held in a predetermined amount or more in the means.

Therefore, when the first mode is selected, the storage means is used for power saving in which power consumption can be reduced within a predetermined power supply voltage. If it is out of range, and if the second mode is selected, it is used for shock proof.

In particular, if a manual switch is used as the mode selection means as in the configuration of the third aspect, the user can arbitrarily select a setting mode according to the purpose. When the device is used in a portable manner, it is possible to use it for a long time by selecting the first mode. Also, when using in places where there is a lot of vibration, such as a car, select the second mode to reduce the shock and vibration.
Proof can be sufficiently obtained and a stable reproduction operation can be performed.

If the automatic mode selection means is used as the mode selection means, the setting mode is automatically set according to the information data read state by the recording information reading means such as an error occurrence state. Since the selection is performed, it is possible to reduce the power consumption while maintaining the reproduction state in which the reproduction information is not disturbed by disturbance or the like.

Also, in the case where a plurality of power supplies are connected to the apparatus as in the fifth aspect of the present invention, and the reproduction operation is performed while selecting the power supply having the highest voltage from among the plurality of power supplies, Since a long time reproduction can be expected, a stable reproduction operation can be performed by using only the second mode.

Further, according to the present invention, the reproducing operation is performed by automatically selecting the first mode or the second mode in accordance with the voltage fluctuation width of the selected power supply during the operation of the device. When the power supply has a large internal impedance and is used only in the first mode, the supply voltage greatly fluctuates when the power supply to the recording information output means is turned ON / OFF or when the servo is started, so that the operation can still be continued. Nevertheless, it is possible to prevent the operation from becoming unstable or the operation of the apparatus from being stopped.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the present invention.

FIG. 3 is a flowchart for explaining the operation of the present invention.

FIG. 4 is a flowchart for explaining the operation of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mini disk 2 Pickup 3 RF amplifier 4 Decoding / signal processing circuit 5 Shock proof memory controller 6 Shock proof memory 7 Voice expansion circuit 8 D / A converter 10 System control microcomputer 11 Servo circuit 12 Driver circuit 13 Spindle・ Motor 14 Feed motor 15 Power supply ON / OFF circuit 16 Power supply circuit 17 Power supply input switching circuit 18 Power supply voltage detection circuit 19 Power supply voltage detection circuit 20 Power save switch 22 Power supply A 23 Power supply B

Claims (6)

[Claims] 1. A recording information reading means for reading information data from a recording medium on which time-axis-compressed information data is digitally recorded, and a storage means for storing the information data read by the recording information reading means. An information reproducing apparatus for temporarily writing information data read from the recording medium into the storage means, and reproducing information by expanding the time axis of the information data read from the storage means at a speed lower than the writing speed; Switching means for switching supply of power to the recording information reading means; and when the storage amount of information data stored in the storage means substantially reaches the storage capacity of the storage means, Controlling the switching means so as to suppress supply of power to the means, and when the information amount of the information data in the storage means becomes equal to or more than a predetermined amount, Control means for controlling the switching means so that the supply of power to the recorded information reading means becomes a steady value, and before the information data in the storage means becomes empty, the information data to the storage means is read out. In an information reproducing apparatus for restarting writing, a voltage detecting means for detecting a voltage of a power supply for driving the apparatus is provided, and only when a voltage value obtained from the voltage detecting means is within a predetermined range set in advance, An information reproducing apparatus characterized by controlling a switching operation of a switching means. 2. A recording information reading means for reading information data from a recording medium on which time-axis-compressed information data is digitally recorded, and a storage means for storing the information data read by the recording information reading means. An information reproducing apparatus for temporarily writing information data read from the recording medium into the storage means, and reproducing information by expanding the time axis of the information data read from the storage means at a speed lower than the writing speed; A switching unit for switching the supply of power to the recording information reading unit; and a mode selection unit for selecting one of the first mode and the second mode, wherein the first mode is selected by the mode selection unit. Is selected, only when the value obtained from the voltage detection means of the power supply for driving the device is within the set range,
If the storage amount of the information data stored in the storage unit has substantially reached the storage capacity of the storage unit, the switching unit is controlled to control the supply of power to the recording information reading unit. In addition, when the storage amount of the information data in the storage unit becomes equal to or less than a predetermined amount, the switching unit is controlled so that the power supply to the recording information reading unit is set to a predetermined value. Controlling the operation of the writing means for writing the information data read from the means into the storage means to restart the writing of the information data to the storage means, while the second mode is selected by the mode selection means, An information reproducing apparatus, further comprising control means for controlling the operation of the writing means so that the shock-proof information data in the storage means is always held at a predetermined amount or more. 3. An information reproducing apparatus according to claim 2, wherein said mode selection means is a manual switch capable of arbitrarily selecting one of a first mode and a second mode. 4. The mode selection means is an automatic mode selection means for automatically selecting one of a first mode and a second mode according to a state of reading information data by the recording information reading means. The information reproducing apparatus according to claim 2, wherein: 5. A power supply means for supplying power to a device from a plurality of power supplies, a voltage detection means for detecting a voltage of each power supply of the power supply means, and a highest voltage based on a voltage value obtained from the voltage detection means. Power supply selection means for automatically selecting a power supply having the following characteristics: when the mode selection means selects the second mode, the information data for shock proof in the storage means is always held at a predetermined amount or more. 3. The information reproducing apparatus according to claim 2, wherein an operation of said writing means is controlled. 6. A power supply means for supplying power to a device from a plurality of power supplies, a voltage detection means for detecting a voltage of each power supply of the power supply means, and a highest voltage based on a voltage value obtained from the voltage detection means. Power supply selection means for automatically selecting a power supply having a, power supply voltage fluctuation during the operation of the device by the power supply selected by the power supply selection means is detected by the voltage detection means,
When the power supply voltage fluctuation range exceeds a preset value, the second mode is automatically selected only when the mode selection means drives the apparatus using the selected specific power supply. 3. The information reproducing apparatus according to claim 2, wherein the mode selecting means selects the first mode when the fluctuation width is within a set value.