JPH0322258A - System for automatic recording to recording medium - Google Patents

Abstract

PURPOSE:To form a sound, which is equipped with a consonant in a leading part, to exact sound data by recording a sound signal to an auxiliary recording area in a standby state and connecting data for a fixed period with data in a real recording area before a first time point when the sound signal exceeds a reference level. CONSTITUTION:A digital sound signal to be outputted from an A/D converter 3 is supplied to a memory 4 by an automatic recording mode and successively written to the auxiliary recording area. during such an auxiliary recording period, when the sound signal exceeding the prescribed reference level is generat ed and this signal is detecting by a comparator 7, a write control circuit 8 starts real recording to the real recording area of the memory 4 from this first time point. When the recording is advanced to an A address and the sound signal is less than the reference level, the circuit 8 starts measurement by a timer and a signal is recorded from an Aj+1 address intial the timer is set up (to the second time point.) Next, condensing operation is executed and after a time point back to prescribed time from the first time point, the data written to the auxiliary recording area to the first time point are synthesized with the data written to the real recording area after the first time point.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a recording medium such as an IC memory or a magnetic disk.
This paper relates to methods for writing digital audio signals, and in particular to automatic recording methods that can effectively utilize the recording capacity of recording media. (Conventional technology) Conventionally, in automated machine factories, etc.
2. Description of the Related Art When an abnormality occurs in a process, a device is known that not only detects the abnormality but also issues an audio warning to notify a worker of the abnormal condition.

This type of alarm device is equipped with an IC memory in which multiple notification contents are recorded in advance as audio signals, and when a detection signal indicating the occurrence of an abnormality is input, an audio signal corresponding to the detection signal is output. It is called from the IC memory and an alarm is emitted by the speaker.

Conventionally, the method of recording multiple notification contents in RC memory is to amplify the audio signal from the microphone and then
The data is converted into a digital signal by a D converter, and the digital signal is written into an IC memory by a known write control circuit.

Also, a method is adopted in which a plurality of notification contents are recorded in advance on a magnetic tape using a tape recorder, and the reproduction signal of the magnetic tape is connected to the A/D converter l\\ when recording to the IC memory. ．． (Problem to be Solved) However, the recording time per chip of an IC memory is much shorter than that of a magnetic tape or the like, and only a few minutes of recording time can be secured, for example.

However, in the conventional recording method for IC memory, the start and stop of the writing operation was performed manually, so the start point of the writing operation was set much earlier than the actual point when the audio was generated. This often results in recording being performed in a silent state, resulting in a problem that a large amount of the recording capacity of the IC memory is wasted.

Particularly when recording playback signals from a magnetic tape onto an IC memory, it is difficult to know when to start and stop a write operation. By the way, as a control device for a tape recorder, a tape drive control device (for example, Jikko 56
-433) is known, and it is also possible to apply this device to the automatic recording method to the IC memory. However, since the control device starts the recording operation only after the level of the recording signal exceeds a predetermined level, it has the following problems. For example, when recording audio starting with a consonant such as "ku", the pronunciation of the consonant "k" is shorter than the pronunciation of the vowel II or uII, as shown in Figure 3 (.). However, the audio level is quite low. Therefore, in order to accurately record the voice of "kuI1," it is necessary to set the predetermined level very low and start automatic recording at the same time as the consonant "k." Furthermore, since the control device stops the recording operation as soon as the recording signal drops below a predetermined level, for example, even if there is only a slight break between words, recording is stopped or
Alternatively, when the final pronunciation of a series of sounds gradually decreases in level, there is a problem in that the last pronunciation is not reliably recorded and is interrupted.

It is an object of the present invention to record all voices including consonants, even if the voice starts with a consonant, while maintaining the standard voice level at which recording should be started at an appropriate value, and to record unrecorded portions of voice data. Another object of the present invention is to provide an automatic recording method on a recording medium that can reduce the number of sounds to a greater extent than in the past.Another object of the present invention is to provide an automatic recording method that can reliably record up to the last pronunciation part. (Means for solving the problem) In the recording method of the present invention, in the recording area of the recording medium,
A preliminary recording area and an actual recording head area are set.

The input audio signal is converted into a digital audio signal, and during recording standby, the digital audio signal is repeatedly written to the preliminary recording area of the recording medium, and the level of the input audio signal is continuously detected.

and a first one whose level exceeds a predetermined reference level;
At this point, writing of the digital audio signal to the actual recording head area of the recording medium is started.

Thereafter, at a second point in time when the level of the audio signal falls below a predetermined reference level and the level continues to decrease, writing of the digital audio signal to the actual recording head area is stopped. Next, after a predetermined time period from the first point in time, a first
The first data written in the f-preparation recording area during the period up to the point in time, and the second data written in the actual recording area after the first point in time.
Synthesizing with data 9 <Function> In the recording standby state, digital audio signals are always written in the pre-recording area at a constant cycle, and at the first point in time when the level of the audio signal exceeds a predetermined level, it is higher than that point. The digital audio signal (first data) of the previous certain period is recorded in the preliminary recording area. Therefore, even when recording audio starting from a consonant, the data representing the consonant is recorded in the first data. It is included at the end of the data, and if the first data in the preliminary recording area and the second data in the actual recording area are connected, accurate digital audio data including the initial consonant will be obtained.Actual recording head area During recording, when the audio level drops below a predetermined reference level and this state continues (second time point), the recording operation is stopped.

As a result, the entire series of sounds, including the last sound part, is recorded without interruption.

Next, by combining the first data and the second data, both data are recorded on the recording medium in a chronologically connected state.

(Effects of the Invention) According to the automatic recording method according to the present invention, all sounds including consonants can be recorded, even if the sound starts with a consonant.At this time, the standard sound level at which recording should be started is set to an appropriate value. Since the settings can be made, there is no risk of malfunction due to noise, etc.

Furthermore, since recording is stopped only when the level of the audio signal falls below a predetermined reference level and this condition continues, recording is performed reliably up to the last pronunciation part of the audio. Furthermore, since the present invention hardly generates unrecorded portions due to conventional manual operations, it is possible to effectively utilize the recording capacity of the recording medium.

(Examples) The examples are for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope. Fig. 1 shows the present invention. Figure 4(a) to (e) shows the circuit configuration for implementing the automatic recording method related to the memory <<4>
This shows the status of the recording area within. An input audio signal from a microphone or tape recorder is connected to the input terminal (1) shown in FIG. The output of the A/D converter (3) is connected to the data input port of the memory (4).

The memory (4) has a recording area (from address A0 to Aee in the figure) for writing digital audio signals as shown in Figure 4(a).
address), and the recording area is an auxiliary recording area (AO
The output terminal of the amplifier 2 is connected to a level detection circuit as shown in Fig. 1. (5>), whereby level changes in the input audio signal are continuously detected.

Both output terminals of the level detection circuit (5) and the reference level setting circuit (6) for setting the reference value of the audio level at the time of starting and stopping recording are connected to a converter (7>I\) and Compare the magnitude of both outputs.

The comparator (7) outputs a pulse signal indicating this when the level of the input audio signal exceeds the reference level during recording standby, and outputs a pulse signal indicating this when the level of the input audio signal falls below the reference level during recording. It outputs a pulse signal indicating the

The output pulse of the comparator (7>) is connected to a write control circuit (8) that controls the write operation of the digital audio signal to the memory (4>), and starts recording in the actual recording area of the memory (4>). In addition, the write control circuit (8) includes a time setting circuit (8) for setting predetermined times T1 and T2, which are information necessary when condensing recorded data, which will be described later. 9) is connected.Hereinafter, regarding the circuit operation of FIG. 1 and the state change of the recording area in the memory (4>) when executing the automatic recording method of the present invention, the flowchart of FIG. Figures (a) to (
The details will be explained in accordance with the explanatory diagram e).

When the automatic recording mode is set, the digital audio signal output from the A/D converter (3) in Fig. 1 is stored in the memory <4>.
and preliminary recording (FIG. 5 (11)) is performed. That is, the digital audio signal is sequentially written from address A0 to address Ai in the preliminary recording head area shown in FIG. The operation of returning to the address and continuing writing is repeated at regular intervals.

During this period, an audio signal exceeding a predetermined reference level occurs, which is detected (
(12) in FIG. 5), from this point (first point in time), the write control circuit (8> starts actual recording ((13) in FIG. 5) for the actual recording area of the memory (4>). That is, as shown in FIG. 4(b), from the recording address Av in the memory (4) at the first time point to the starting address (A i + 1) of the actual recording area
/\The recording address is shifted, and digital audio signals are recorded in order from the recording address. In addition, the write control circuit (8)
During the actual recording, reset the built-in timer (fifth
Figure (15)) Maintain the L state.

Thereafter, when the recording progresses to address Aj in FIG. 4(b), the level of the audio signal drops below the predetermined reference level, and this is detected by the converter (7) in FIG. 1 ((14) in FIG. 5). ), the write control circuit (8) starts measuring the duration of the level drop state using the timer and continues the actual recording operation.

In the actual recording after the level of the audio signal has decreased, the signal is recorded from the address (Aj+1) shown in FIG. The timer is set up (Figure 5 (16)
), the recording operation is stopped at the second point in time.

As a result, the memory (4>) contains (Aj+
1) The silent recording area from the address to the Ak address is marked. In the silent recording area, in addition to audio signal data below a predetermined reference level, silent signal data after the level has decreased to zero is recorded.

Next, the write control circuit (8>) performs an a reduction operation (Fig. 5 (17)) of the recorded data in the memory (4). That is, as shown in Fig. 4 (e) and (d), the actual recording After the predetermined time T1 goes back from the first point in time when the transition to
The digital audio signal (first data) from address Au to AV address recorded up to that point is transferred to the area from address (Ai+1) to At address (first data), which is the beginning of the actual recording area.
area). Also, at the same time, (
The digital audio signal (main data) recorded in the area from address Ai+1) to address Aj is moved to the area from address (AI+1) to A (second area) following the AI address. From the silent recording area in FIG. 4(c), the sound signal is recorded until the predetermined time T2 has elapsed after it was detected that the audio signal had fallen below the predetermined reference level (
Aj+1) Digital audio signal from address A to address (
End data〉 follows address Am in Fig. 4(d)〉〉(A
11+1) to the area from address Aκ. Note that the predetermined times T1 and T can be arbitrarily set by the time setting circuit (9) in FIG. 1. As a result, the first data, main data, and end data are connected in chronological order. In this state, the data is written from the address (Ai+1) in FIG. 4(d) to the address Ax in the am state.

After data condensation is completed, the process returns to preliminary recording (11) in FIG. 5 and repeats the same recording operation as described above. At this time, as shown in FIG. 4(e), the same area as above is used as the preliminary recording area, and a new actual recording area is created following the A× address with an initial address of <(A×+1>). Therefore, even when recording multiple audio signals representing different notification contents intermittently at time intervals, these audio signals are stored in the recording area of the memory (4). According to the above-mentioned automatic recording method, it goes without saying that, for example, when recording a voice starting from the vowel "U" as shown in FIG.
Even in the case of recording a voice starting from the consonant "re" as shown in FIG. Since the signal can be recorded in the memory (4), accurate recording including the pronunciation of consonants can be achieved.Also, when recording is stopped, the state in which the audio signal has fallen below the reference level is realized. After continuing for a predetermined time, the memory (
4), and only the audio signal recorded during the initial period T2 of the predetermined time is finally stored in the memory (4).
For example, even if the final pronunciation of a series of sounds gradually decreases in level, it will be recorded in the memory <4> without interruption until the last pronunciation part. There are no silent recording areas between the audio recording areas. Further, the predetermined times Tl and T are set by the time setting circuit <<9>>.
By adjusting the length of 2, it is possible to set the minimum necessary time even for audio waveforms and audio levels that vary from person to person, thereby making it possible to use the memory (4) more effectively.

The drawings and the description of the above embodiments are for illustrating the present invention, and do not limit the invention described in the claims.
Nor should it be construed as limiting the scope.

The configuration of each part of the present invention is not limited to the above embodiments, and various modifications can be made within the technical scope of the claims. For example, the automatic recording method of the present invention can of course be implemented not only for recording on an IC memory node but also for recording on various recording media such as magnetic disks and optical disks. ) was sequentially shifted to achieve the recording state shown in FIG.
It is also possible to temporarily register the data in the condensed state of FIG. 4(c) in the dedicated memory, and then move the contents of the dedicated memory to the predetermined address in FIG. 4(,I).

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an electric circuit for implementing the automatic recording method according to the present invention, and FIGS. 2(a) and 2(b) show waveform diagrams of an input audio signal starting with a vowel and changes in its audio level, respectively. Graphs, Figures 3(a) and 3(b) are graphs showing waveform diagrams of input audio signals starting with consonants and changes in their audio levels, respectively. Figures 4(a) to (e) explain recording states in memory. FIG. 5 is a flowchart showing the circuit operation of FIG. 1. (1)...Input terminal (3)...A/D converter (4)...Memory (8)...Writing control circuit 5 diagram

Claims (2)

[Claims] (1) A method of writing externally input audio signals to a recording medium, in which a preliminary recording area and an actual recording area are set in the recording area of the recording medium, and the input audio signals are converted to digital audio signals. During recording standby, the digital audio signal is repeatedly written to a preliminary recording area of the recording medium, and the level of the input audio signal is continuously detected;
At a first point in time when the level exceeds a predetermined reference level,
After the digital audio signal is written in the actual recording area of the recording medium, at a second point in time when the level of the audio signal falls below a predetermined reference level and the level decrease continues,
After stopping the writing of digital audio signals to the actual recording area and going back a predetermined time from the first point in time, the first data written in the preliminary recording area during the period up to the first point in time, and the first data written in the preliminary recording area during the period up to the first point in time, An automatic recording method for a recording medium, characterized in that it is composed of second data written in an actual recording area. (2) The recording medium has a recording area for the digital audio signal from the first point in time to the point in time when the level of the audio signal falls below a predetermined reference level, and a recording area from the point in time when the level of the audio signal falls below a predetermined reference level. A silent recording area is provided in which a digital audio signal up to the second point in time is written, and the second
The data includes main data written in the actual recording area during the period from the first time point until the time point when the audio signal level falls below a predetermined reference level, and the main data written in the actual recording area after the time point when the audio signal level falls below the predetermined reference level. The automatic recording system according to claim 1, wherein the automatic recording system is formed from end data written in the silent recording area within a predetermined time.