JPH0475099A - Voice recording and reproducing device - Google Patents

Abstract

PURPOSE:To utilize a memory effectively by detecting no-voice parts of voice data in a storage means and rearranging n-voice data so that the no-voice parts are eliminated. CONSTITUTION:On a voice memory 2 right after voice data are written by the voice recording and reproducing device 1, the no-voice parts 21 in th voice data are handled equally to voice parts 20 and occupy the memory. For the purpose, a non-voice area detector 4 reads the data out of the voice memory 2 in order and judges the no-voice parts when data which are lower than a specific level continue for longer than a specific time. Then the no-voice area detector 4 transfers the voice data on the voice memory 2 and rearranges the data sot aht the no-voice parts are eliminated. Consequently, the memory is utilized effectively.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a voice recording/playback device.

<Prior art> Voice recording and playback devices that use fixed memory such as semiconductor memory have attracted attention for their advantages such as being small and capable of random access, and have been put to practical use and widely used in answering machines, alarm devices, etc. .

<Problems to be Solved by the Invention> However, this voice recording/playback device using fixed memory requires a large capacity memory in order to secure recording time, which has been a problem in terms of cost.

There have also been attempts to make effective use of memory by using audio triggers to record only when there is audio.
There were drawbacks such as the inability to eliminate long silent periods during recording operations. Furthermore, in this case, there were various problems such as the need to newly provide a circuit.

Means for Solving the Problems> The present invention has been made to solve the above-mentioned problems, and includes a storage means for storing audio data, a recording/reproducing means for recording and reproducing the audio data in the storage means, and a storage means for storing audio data. A detection means for detecting a silent part of audio data in a storage means, and a relocation means for rearranging the silent data so as to eliminate the silent part in the storage means based on the detection result of the detection means. It is characterized by

<Operation> The recording and reproducing means records audio data in the storage means. The detection means sequentially reads out the audio data recorded in the storage means and detects silent portions. Then, the rearranging means rearranges the data in the storage means based on the detection result so as to eliminate the silent portion.

<Example> An embodiment of the present invention will be described based on the drawings.

Note that in this specification, the term "silent part" refers to a silent part that exists at the beginning of the audio memory 2 or a part sandwiched between the sound parts 2o, which will be described later, and that is excluded when playing back the audio. means a portion that lasts for a predetermined period of time or longer without hindering audibility. Therefore.

It does not include short periods of silence due to breathing, etc.

FIG. 1 is a block diagram thereof.

The audio recording and playback device 1 digitizes the audio and stores it in the audio memory 2.
is configured to record to. Further, the silent area detector 4 is configured to read out the recorded data, detect silent parts, and rearrange the data so as to eliminate the silent parts. The recording time annunciator 3 is configured to calculate and notify the recordable time after this rearrangement.

The audio recording and reproducing device 1 is configured to convert audio into a digital signal and record it in the audio memory 2, or conversely to convert the digital signal read from the audio memory 2 into audio.

The silent area detector 4 detects silent portions of the audio data recorded in the audio memory 2, and further eliminates 29 to make effective use of the memory. Immediately after the audio data is written by the audio recording/playback device 1, the audio memory 2 contains a silent portion 2 of the audio data as shown in FIG. 2a.
1 is also treated in the same way as the sound part 20, and occupies memory. Furthermore, it is not possible to record the silent part 21 at the beginning or the silent part 21 sandwiched between the sound parts 20.

Therefore, the silent area detector 4 sequentially reads the data recorded in the audio memory 2, and if data at a level lower than a predetermined level (hereinafter referred to as "threshold value") continues for a predetermined time or longer, it is determined to be a silent part. is configured to do so. Then, the silent area detector 4 transfers and rearranges the audio data within the audio memory 2 so that the silent portion is eliminated.

As a result, short silent parts such as breath breaks are ignored, and only long silent parts longer than a predetermined time are excluded as silent parts. As a result, the audio data in the audio memory 2 is arranged as shown in FIG. Note that the recordable section 23 is created by rearranging the audio data and is not a "silent section." In addition, the silent area detector 4 and the audio recording/playback device 1 are connected to a control line between the audio memory 2 and the silent area detector 4, and a control line between the audio memory 2 and the audio recording/playback device so that the input/output to the audio memory 2 does not collide. The control lines between the devices 1 are constructed so that both do not become high impedance at the same time.

The recording time annunciator 3 is configured to detect the length of the recordable section 23 remaining after the sound data has been rearranged by the silent area detector 4, convert it into a recording time, and notify the user.

Next, the operation will be explained.

After starting the operation (step 50), the silent area detector 4 converts the current address in the audio memory 2 to the start address (sad
r) and at the same time address counter (Xs)
Copy the first address to (step 51). After clearing the counter for counting the number of continuous silent data (step 67'), the audio data is read (step 52).

Then, increment the address (step 53
), it is determined whether the read audio data is below a threshold value (step 54). As a result, if it is above the threshold value, it is determined whether or not it is the end of the audio memory 2 (step 67).

If it is not the end, the process returns to step 67', but if it is the end, the operation is ended (step 69).

After this, although not shown in the flowchart,
A recording time annunciator 3 converts the length of the recordable section 23 into time and notifies the user.

On the other hand, if the audio data is below the threshold in step 54, the silent data count is increased by 1 (step 55), and it is determined whether the count has reached a predetermined number of times (step 56). If the count value is still less than the predetermined number of times, the process returns to step 52 and repeats the same operation, but if the predetermined number of times has been reached, the next audio data is read and the address is incremented until the data exceeds the threshold value. (step 57). After that, the address Xs where the audio data exceeds the threshold for the first time is updated as the new start address (s a d r) (
Step 58).

Next, clear the counter that counts the number of silent data (Step 59), read the audio data (Step 60), and increment the address (Step 6).
1) Determine whether the read audio data is below the threshold value (step 62), and if it is above the threshold value, determine whether it is the end of the audio memory 2 (step 62). Step 68). If it is not the end, the process returns to step 59, but if it is the end, the operation is ended (step 69).

On the other hand, if the audio data is below the threshold in step 62, the count number of silent data is increased by 1 (step 63), and it is determined whether the count number has reached a predetermined number of times (step 64). . If the count value is still less than the predetermined number of times, the process returns to step 60 and repeats the same operation.

If the predetermined number of times has been reached, the final address is calculated as (current address Xs - threshold value n for the number of silent data) and is stored as (6adr) (step 65). Thereafter, data transfer processing, which will be described later, is performed (step 66), and then the process returns to step 52.

FIG. 4 is a flowchart showing the data transfer process.

In this data transfer routine, the silent area detector 4
sets the start address (s a dr) of the silent section to the variable i
(step 70), and copies the data at N addresses to the location of address i (step 91). Thereafter, the current address pointer is incremented (step 72), and the value of variable i is increased by 1 (step 73).

As a result, the silent area detector 4 judges whether or not i becomes equal to the final address (e a d r) (step 74). If not, the process returns to step 71 and repeats the same operation, but if they are equal, The audio data is read (step 75), and the current address pointer is incremented (step 76). Then, variable 1 is increased by 1 (step 77).

Next, it is determined whether the read data is below the threshold (step 78), and if it is above the threshold, the data at the current address is copied to the address (step 7).
9), clear the count (step 80). Then, the process returns to step 75.

On the other hand, if it is determined in step 78 that it is below the threshold value, the silent area detector 4 increases the silent data count number by 1 (step 81), and determines whether the counted number has reached a predetermined number of times (step 81). 82)6 If the predetermined number of times has not been reached, the process returns to step 75, but if the predetermined number of times has been reached, the address is returned by the predetermined number of times (step 83), and this routine ends (step 84). .

In the embodiments described above, memory usage efficiency can be improved by eliminating unnecessary silent parts that last for a predetermined time or more while leaving data parts such as breaths in the recorded data as they are.

<Effects of the Invention> As explained above, the audio recording and reproducing apparatus of the present invention includes a storage means for storing audio data, a recording and reproducing means for recording and reproducing the audio data in the storage means, and a recording and reproducing means for recording and reproducing the audio data in the storage means. and a rearrangement means for rearranging the silent data so as to eliminate the silent part in the storage means based on the detection result of the detection means. Since unnecessary silent or unrecorded portions can be eliminated and used as new recordable areas, effects such as effective use of memory can be obtained.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the memory usage state before and after data relocation, Fig. 3 is a flowchart showing its operation, and Fig. 4 is a flowchart diagram showing a data transfer operation. 1: Audio recording and playback device, 2: Audio memory, 3: Recording time alarm, 4: Silent area detector, 20: Sound part, 21
: Silent part, 23: Recordable section.

Claims (2)

[Claims] (1) A storage means for storing audio data, a recording and reproducing means for recording and reproducing the audio data in the storage means, a detection means for detecting a silent part of the audio data in the storage means, and a detection result of the detection means. a rearranging means for rearranging silent data so as to eliminate silent portions in the storage means based on the above. (2) The audio recording and reproducing device according to claim 1, further comprising: a calculation unit that calculates the recordable audio data time of the storage unit; and a notification unit that notifies the calculation result by the calculation unit.