JPH113100A - Recording and playback device - Google Patents

Abstract

(57) [Summary] [Problem] To prevent reproduction of unpleasant noise such as operation sound immediately before the end of recording. SOLUTION: When a record button 102 is pressed, a memory control means 9 compresses voice data input from a voice input part 5 by a DSP 6, and then stores the voice data in a voice data storage part 8 of a memory 8.
Record in a. At this time, the management table control means 11 records the start address of the recording start point of the audio data in the management table storage section 8b. When the stop button 103 is pressed, the memory control means 9 stops recording the audio data. At this time, the management table control means 11 records, in the management table storage unit 8b, a recording address several hundred milliseconds before the end of the recording of the audio data as an end address.
Next, when the reproduction button 101 is pressed, the memory control means 9 reads out the audio data from the audio data storage section 8a and reproduces it, but stops reading the audio data at the end address. Therefore, the sound output unit 10 does not reproduce the operation sound immediately before the end of the recording.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a recording / reproducing apparatus such as a memory recorder using a solid-state memory as a recording medium.

[0002]

2. Description of the Related Art Conventionally, a recording / reproducing apparatus for recording / reproducing a sound in / from a solid-state memory such as an SRAM is, for example, a memory recorder. This memory recorder uses a microphone (hereinafter abbreviated as a microphone) built in the housing surface as an audio input unit. In addition, an operation unit related to recording and reproduction is often similarly arranged on the surface of the housing.

When recording a voice with such a memory recorder, first, a recording button is pressed on the operation unit to start recording, and then, a stop button is pressed to stop recording. At this time, since the recording operation of the memory recorder is stopped after the stop button is pressed, when the user operates the stop button, the sound of the hand touching the housing and the operation sound of the button are also included in the solid-state memory. Will be recorded. For this reason, when the recording information in the solid-state memory is reproduced by the memory recorder, the sound of the hand touching the housing and the operation sound of the button immediately before the end of the recording are reproduced.

[0004]

As described above, in a recording / reproducing apparatus such as a conventional memory recorder, a recording stop operation sound and the like are recorded as noise at the end of recording, in addition to the sound originally intended to be recorded. There is a problem that these sounds are reproduced at the time of reproduction, which is harsh.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a recording / reproducing apparatus which can prevent reproduction of unpleasant noise such as an operation sound immediately before the end of recording. With the goal.

[0006]

According to a first aspect of the present invention, there is provided a recording medium on which data is written and read, and a recording medium for writing and recording data on the recording medium, or a method for reading and reproducing data from the recording medium. Reproducing means, operating means for issuing a recording or reproducing instruction to the recording / reproducing means, and a management table for managing each recording area of the recording medium, wherein the data in the recording medium is recorded at the end of recording of the data. And a control means for recording a location temporally before the recording end location in the management table as a recording end location.

[0007] With such a configuration, a position immediately before the operation noise or the like recorded near the recording end location of the data on the recording medium is recorded in the management table as the recording end location. During reproduction, the reproduction is stopped at the recording end location in the management table, so that the data in which the operation noise or the like is recorded is not reproduced.

According to a second aspect of the present invention, there is provided a configuration in which the time before the recording end location of the data on the recording medium is arbitrarily set as the recording end location in the management table. ing.

According to a third aspect of the present invention, the recording / reproducing means reads and reproduces the data of the recording medium from a recording start address recorded in the management table, stops reading at a recording end address, and stops reproduction. It has a configuration.

According to a fourth aspect of the present invention, the recording medium is a solid-state memory, and the control means records in the management table a recording address temporally before a data recording end location of the solid-state memory as an end address. It has a configuration.

According to a fifth aspect of the present invention, the solid state memory is an SRA
M.

According to a sixth aspect of the present invention, there is provided a configuration in which a location several hundred milliseconds before an actual recording end location of the data on the recording medium is recorded in the management table as a recording end location.

According to a seventh aspect of the present invention, the data is configured to be audio data.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the recording / reproducing apparatus of the present invention. Reference numeral 1 denotes an operation unit including a reproduction button 101, a recording button 102, a stop button 103, an FF button 104, and a REW button 105. 2 denotes a mode transition control unit for causing the apparatus to transit to various modes such as a recording mode or a reproduction mode. Is a display unit composed of a liquid crystal display device or the like for displaying the operation state of the device,
4 is a display control unit for controlling the display unit 3, 5 is a voice input unit having a microphone 51, a filter 52, and an A / D conversion circuit 53, and 6 is a D for compressing and expanding digital voice data.
SP (Digital Signal Process)
or) and 7 are DSP control means for controlling the DSP 6, and 8 is a memory constituted by, for example, an SRAM, which is divided into an audio data storage section 8a and a management table storage section 8b.
Reference numeral 9 denotes a memory control unit that controls reading and writing of data from and to an audio data storage unit 8a of the memory 8. Reference numeral 10 denotes an audio output unit having a D / A conversion circuit 201, a filter 202, and a speaker 203. Reference numeral 11 denotes a management table storage unit of the memory 8. 8b
Management table control means for recording and managing a recording start address and a recording end address, a battery detection control means 12 for detecting that the output voltage of the battery 14 has fallen below a predetermined value, and a reference numeral 13 for controlling the output voltage of the battery 14. An A / D conversion circuit 14 for converting into digital information is a battery which is a power supply of the present apparatus.

Next, the operation of this embodiment will be described. At the start of recording, the operator presses a recording button 102 provided on the operation unit 1. The mode transition control unit 2 detects that the recording button 102 has been pressed, shifts the apparatus to the recording mode, and issues a recording start instruction to the DSP control unit 7, the management table control unit 11, and the memory control unit 9. At this time, the sound input to the microphone 51 of the sound input unit 5 becomes an analog sound signal, and is input to the A / D conversion circuit 53 through the filter 52. A / D conversion circuit 53
Converts the input audio signal into digital data and outputs it to the DSP 6. Upon receiving the recording start instruction, the DSP control means 7 controls the DSP 6 to compress the audio data input from the audio input unit 5 and output the compressed data to the memory 8. The memory control unit 9 records the audio data compressed by the DSP 6 in the audio data storage unit 8a of the memory 8.

Here, the memory control means 9 has a function as a recording / reproducing means, whereby writing and reading of audio data to and from the audio data storage section 8a of the memory 8 are performed. The audio data storage section 8a is controlled so as to perform reading during reproduction. Further, the management table control means 11 writes the recording start address and the recording end address of the area where the audio data is recorded in the audio data storage section 8a of the memory 8 in one recording operation into the management table section 8b. Is controlled to read out data of one case with reference to FIG.

Each time the operation mode changes, the mode transition control means 2 notifies the display control unit 4 of the operation mode at that time. The display control unit 4 performs a display corresponding to the notified operation mode on the display unit 3.

FIG. 2 is a schematic diagram showing an example of a recording configuration in the memory 8. FIG. 2A shows the management table unit 8b,
(B) shows the audio data storage unit 8a and the management table unit 8b. The management table unit 8 as shown in FIG.
b is for managing the allocation of the memory area when distinguishing the area of the audio data storage section 8a of the memory 8. In a solid-state memory or the like, the recording start address, the recording end address and the like are recorded and managed. doing.

In the audio data storage unit 8a, a unit that handles audio data recorded in one recording operation as one piece of information is called a chapter (the number of recordings), and indicates a recording unit such as a solid-state memory. It means one break. The management table control means 11, as shown in FIG.
For each chapter, information such as a recording start address and a recording end address is written to a predetermined portion of the management table 8a at the start of recording, during recording, or at the end of recording.

Next, the creation of the management table will be described. When the memory controller 9 writes the audio data input from the audio input unit 5 via the DSP 6 to the audio data storage unit 8a of the memory 8, the management table controller 11 records the audio data recorded in the past from the recording information of the management table unit. The number of chapters and the end address are searched. In the example of FIG. 2, up to chapter 3 is already recorded, and audio data is recorded as chapter 4 from the 0101 address obtained by adding 1 to the end address. At this time, the management table control means 11 writes the recording start address in the management table, and continues to write this address as the recording end address every time the write address increases during recording. The management table control unit 11 has a stop button 103
Continue until is pressed.

When the stop button 103 of the operation unit 1 is pressed to stop recording, the management table control unit 11 of the present embodiment
The previous address is written into the management table 8b as the end address for a certain fixed time from the write address at the end of recording. For example, assuming that the write address at the end of recording is 0150, 0140 500 ms before is set as the end address. However, the correspondence between time and address differs depending on the bit rate of data to be recorded. Further, although it is optional how long it is, the present example is set to about several hundred milliseconds since it is intended to remove noise when the stop button 103 is operated.

Therefore, from the end address of the audio data recorded on the actual audio data storage section 8a of the memory 8,
The value of the end address written on the management table is small,
It is before the actual end time. The management table control means 11 repeats the above operation, and
As shown in (1), the recording start address and the recording end address for each chapter are written in the management table.

Next, a part related to the reproducing operation will be described. The mode transition control means 2 is a reproduction button 10 of the operation unit 1.
When it is detected that 1 has been pressed, the apparatus is shifted to the reproduction mode, and this is transmitted to the DSP control means 7, the management table control means 11 and the memory control means 9. DSP control means 7
Sends a reproduction instruction to the DSP 6. At this time, the memory control means 9 reads out the audio data recorded in the audio data storage section 8a of the memory 8 and outputs it to the DSP 6.

Thus, the DSP 6 reproduces the input compressed audio data by expanding and restoring the data. The reproduced audio data is guided to the audio output unit 10, converted into an analog audio signal by the D / A conversion circuit 101, and further output from the speaker 203 through the filter 202.
The memory control unit 9 reads the audio data recorded in the audio data storage unit 8a up to the recording end address written on the management table, and terminates the reading here. The output of the sound from 203 stops.

The display section 3 is provided for displaying the recorded portion, and the user searches for the portion to be reproduced while watching the display. By fast forward (FF) or rewind (REW), a part to be reproduced can be searched and reproduced.

When the voltage of the battery 14 becomes so low that the device cannot operate normally, the battery control detecting means 12 detects the decrease of the voltage via the A / D conversion circuit 13, and detects this by the mode transition control. Inform means 2
In response to this, the mode transition control means 2 displays a decrease in battery voltage on the display unit 3 via the display control unit 4.

Next, an explanation of the operation of this embodiment will be supplemented with reference to FIG. For example, recording of voice is started by an operation of the recording button 101 of the operation unit 1 (step S1). Thereafter, the recording is terminated by the recording end operation by the stop button 103 (step S2). At this time, the operation noise of the stop button 103 is recorded in the audio data storage unit 8a of the memory 8. However, as described above, the management table control unit 11 records the address several hundred milliseconds before the write address at the end of recording in the management table storage unit 8b as the end address (step S3). At the time of reproduction, since only the end address is reproduced, the operation noise of the stop button 103 is not reproduced (step S
4).

According to the present embodiment, the management table control means 11 sets the recording end address of one chapter written in the audio data storage section 8a several hundred milliseconds before the actual end of writing by operating the stop button 103. The memory control means 9 writes the data in the audio data storage section 8a at the recording end address.
The reading of the audio data written in is stopped.
As a result, since audio data containing noise written thereafter is not read out, operation noise of the stop button 103 and the like are not output from the speaker 203 to the outside, so that reproduction without harshness can be performed. it can. In addition, since the audio data that is not read hardly contains important information, the value of the recorded audio data is not lost. Further, the unnecessary portion which is not reproduced is overwritten at the time of the next audio recording, so that the use efficiency of the memory 8 can be improved.

The user can arbitrarily set how far before the actual recording end address of the audio data storage unit 8a the recording end address is to be written in the management table storage unit 8b. It can also be set to match.

[0030]

As described above, according to the recording / reproducing apparatus of the present invention, it is possible to prevent reproduction of unpleasant noise such as operation sound immediately before the end of recording.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a recording / reproducing apparatus according to the present invention.

FIG. 2 is a schematic diagram showing a configuration and an example of contents of a memory shown in FIG. 1;

FIG. 3 is a time chart when recording and reproducing audio data by the apparatus shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Operation part 2 Mode transition control means 3 Display part 4 Display control part 5 Voice input part 6 DSP 7 DSP control means 8 Memory 8a Voice data storage part 8b Management table storage part 9 Memory control means 10 Voice output part 11 Management table control means 12 Battery detection control means 13, 53 A / D conversion circuit 14 Battery 51 Microphone 52, 202 Filter 101 Play button 102 Record button 103 Stop button 104 FF button 105 REW button 201 D / A conversion circuit 203 Speaker

Claims (7)

[Claims] 1. A recording medium on which data is written and read, a recording and reproducing unit for writing and recording data on the recording medium, or a recording and reproducing unit for reading and reproducing data from the recording medium; Alternatively, an operation means for issuing a reproduction instruction, and a management table for managing each recording area of the recording medium, wherein at the time of the end of the recording of the data, a place temporally before the end of the recording of the data on the recording medium Recording means for recording the information in the management table as a recording end location. 2. A recording method according to claim 1, wherein the recording end location of the data on the recording medium is arbitrarily set as a recording end location in the management table. 2. The recording / reproducing apparatus according to 1. 3. The recording / reproducing means reads out data from the recording medium from a recording start address recorded in the management table, reproduces the data, ends reading at a recording end address, and stops reproduction. The recording / reproducing apparatus according to claim 1, wherein 4. The recording medium is a solid-state memory, and the control means records in the management table a recording address temporally before an end of recording of the data in the solid-state memory as an end address. Claim 1
The recording / reproducing apparatus as described in the above. 5. The recording / reproducing apparatus according to claim 4, wherein said solid-state memory is an SRAM. 6. The management table according to claim 1, wherein a location several hundred milliseconds before an actual recording end location of the data on the recording medium is recorded as the recording end location in the management table.
The recording / reproducing apparatus as described in the above. 7. The recording / reproducing apparatus according to claim 1, wherein said data is audio data.