JP3501744B2 - Answering machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to compression of voice data in an answering machine having a backup flash memory so that data is not lost even if the power supply to the device is cut off due to a power failure or the like. The present invention relates to an answering machine that changes the rate and stores data with a high compression rate in a flash memory as backup data.

[0002]

2. Description of the Related Art In a conventional answering machine, a flash memory has a large capacity and a high cost for backing up a message. The message message backup function is a function to prevent the data from being lost even if the power is cut off due to a power failure or the like. A conventional answering machine having a backup function for such a message is configured as shown in FIG.

FIG. 4 is a block diagram. This Figure 4
At 1, the audio data 1a received by the line interface 1 is sampled at a high frequency and encoded with a low compression rate by the compressor 2, and the high-quality compressed data 2a is stored in the flash memory unit 3. At this time, the flash memory unit 3 functions as a normal storage memory and a backup memory, and is a large-capacity memory.

At the time of reproduction, the compressed high-quality compressed data 2a stored in the flash memory section 3 is read from the flash memory section 3 and the high-quality compressed data 3 is read.
Input a into the expander 4. The decompressor 4 decompresses the high-quality compressed data 3a and supplies it to the speaker 5 as audio data 4a. The speaker 5 is driven to output the audio from the speaker 5. As an approximation technique, Japanese Patent Laid-Open No.
No. 233047 discloses that when recording from a tape to a memory after a power failure is recovered, when the memory capacity is insufficient,
It is disclosed to record by reducing the sampling frequency to reduce the amount of data.

[0005]

However, in the conventional answering machine as described above, as a backup for preventing the message from disappearing even when the power supply of the device is shut down due to a power failure or the like as described above. Although the flash memory unit 3 is used, the flash memory unit 3 is used not only for backup but also for storing data of the message. Therefore, if the message is long, the flash memory unit having a large storage capacity must be used. Moreover, the unit price of the flash memory is higher than that of the DRAM, and therefore, there is a problem that the cost increases as a backup for a power failure.

The present invention has been made to solve the above-mentioned conventional problems, and provides an answering machine which can reduce the memory capacity of a flash memory required for backup and reduce the cost. The purpose is to

[0007]

To achieve the above object, according to the solution to ## telephone answering device of the present invention is connected to a communication line, and the line-in tough Esu receiving voice data, is received by the line-in tough Esu given the frequency of the audio data
Sampled at wavenumbers, on a relatively sound data received with high quality compressed audio data and the line-in tough Esu of after encoding the sampling signal at a predetermined <br/> compression ratio
The serial was sampled at a frequency lower than the predetermined frequency, this
The sampling signal of the compression rate higher than the above specified compression rate
Compressor for outputting compressed audio data of relatively low sound quality after being encoded by the DRA, and DRA for storing the compressed audio data of high sound quality output from the compressor for normal storage
M memory section, a flash memory section for storing low-quality compressed audio data output from the compressor for backup, and the high-quality sound stored in the DRAM memory section when the high-quality compressed audio data is reproduced. the compressed audio data by expanding the supply to the speaker, and a stretcher supplied to the low-quality speakers and decompressing the low-quality compressed audio data stored in the flash memory when the playback of the compressed audio data It is characterized by being provided.

[0008] Therefore, the audio data received by the line-in tough Esu by Rukoto is input to the compressor, a predetermined
It is sampled at a frequency, and a coded relatively high quality compressed audio data after a predetermined compression rate, the predetermined
Is sampled at a frequency lower than
It is converted into compressed audio data of relatively low sound quality after being encoded at a compression ratio higher than a predetermined compression ratio.
The reduced voice data is stored in the DRAM memory unit, and the low- quality compressed voice data is stored in the backup flash memory unit . The high-quality compressed audio data stored in the DRAM memory at the time of playback is input to the decompressor, decompressed, supplied to the speaker, the speaker is driven, and flash is used at the time of playback in the event of a power failure. The low-quality compressed audio data stored in the memory section is input to the decompressor, decompressed, and supplied to the speaker to drive the speaker, reducing the memory capacity of the flash memory required for backup. Therefore, the cost can be reduced.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of an answering machine according to the present invention will be described with reference to the drawings. Figure 1
FIG. 1 is a block diagram showing a configuration of a first embodiment of an answering machine according to the present invention. The line interface 11 in FIG. 1 is connected to a communication line and receives voice data. The audio data received by the line interface 11 is input to the compressor 12 and supplied to the speaker 16.

The compressor 12 samples and encodes the input audio data, and the DRAM memory unit 13,
It is stored in the flash memory unit 14. The compressor 12 is
In the first embodiment, the line interface 11 is used for reception.
Sampling the received voice data at a predetermined frequency ,
Also, this sampling signal is encoded at a predetermined compression rate.
And compressed line data with relatively high sound quality after
The audio data received by the interface 11
Sampling at a frequency lower than the frequency and
The sampling signal is encoded at a compression rate higher than the above specified compression rate.
The compressed voice data 12b of relatively low quality after encoding
Output . Among them, it is sampled <br/> grayed in the former predetermined frequency, and the compressed audio data of a high sound quality was low compression ratio encoding is stored in DRAM memory 13. Further, the latter is sampled at a frequency lower than the predetermined frequency , and the sampling signal is compressed to a predetermined compression rate.
The compressed voice data having a relatively low sound quality after being encoded in (4) is stored in the flash memory unit 14.

The DRAM memory unit 13 is an ordinary storage memory, and the flash memory unit 14 is a backup memory. The compression rate is changed by the compressor 12,
Compressed audio data is stored. DRAM for playback
The high-quality compressed voice data stored in the memory unit 13 is read, the decompressor 15 decompresses the compressed data, and the speaker 16 outputs the voice. At the time of a power failure, the low-quality compressed audio data stored in the flash memory unit 14 is read out, the decompressor 15 expands the compressed data, and the speaker 16 outputs sound.

Next, the operation of the first embodiment configured as described above will be described with reference to FIG. FIG. 2 additionally shows data on the output side of each unit in the block diagram shown in FIG. 1 for explaining the operation of the first embodiment. As shown in FIG. The audio data 11a received in
Entered in. In this compressor 12, the audio data 12a
Are sampled and encoded, and are stored in the DRAM memory unit 13 and the flash memory unit 14.

At this time, D used for normal storage
The RAM memory unit 13 samples at a predetermined frequency.
And the sampling signal is encoded at a predetermined compression ratio.
Relatively high quality of the compressed audio data 12a after Goka is 蓄<br/> product, the flash memory 14 for backup, a sampling of a frequency lower than the predetermined frequency
In addition, the sampling signal should be
Ri relatively low quality of the compressed audio data 12b after encoding Ru is accumulated at a high compression rate. In this way, the capacity of the backup flash memory unit 14 can be reduced by lowering the sampling frequency to reduce the amount of data. As a result, the DRAM memory unit 13
Although it is a large-capacity memory, the backup flash memory unit 14 can be a small-capacity memory. In this case, since the backup data is data just in case of a power failure, the backup function can be achieved even if the sound quality is low.

At the time of reproduction, the high-quality compressed audio data stored in the DRAM memory unit 13 is read out,
The read high-quality compressed audio data 13 a is input to the decompressor 15. As a result, the high-quality compressed voice data 13a compressed by the decompressor 15 is decompressed, applied as the voice data 15a to the speaker 16, and the voice is output from the speaker 16.

When reproducing low-quality compressed audio data stored in the flash memory unit 14 in the event of a power failure, the low-quality compressed audio data 14a stored in the flash memory unit 14 is read out and expanded. 15
Is input to the speaker 16, the audio data is expanded by the expander 15 and applied to the speaker 16, and the audio is output from the speaker 16.

FIG. 3 is a block diagram showing a concrete example of the embodiment according to the present invention. The basic constituent members in FIG. 3 are the same as those in the first embodiment shown in FIGS. 1 and 2, and the same parts as those in FIGS. 1 and 2 are designated by the same reference numerals. In FIG. 3, consider accumulating a 15-minute message message. DRAM normally used
When storing high-quality compressed audio data of 32 kbps in the memory unit 13, a capacity of 28.8 Mbits is required, and therefore a 32Mbit memory is sufficient for normal use.

Further, the flash memory unit 14 as a backup memory needs a capacity of 1.8 Mbits when accumulating data of 2 kbps, and therefore a memory of 2 Mbits is sufficient. Therefore, in this specific example, the capacity of the flash memory unit 14 required for backup can be reduced to 1/16 of that of the conventional answering machine.

[0018]

As described above, according to the present invention, the flash memory for backup has a frequency higher than a predetermined frequency.
Sampling at low frequency and this sampling
After encoding the signal with a compression rate higher than the predetermined compression rate
Since the compressed voice data of relatively low sound quality is stored, it is possible to reduce the capacity of the flash memory unit. Therefore, with the reduction of the capacity of the flash memory, which has a higher unit price than the DRAM, Cost reduction is possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of an answering machine according to the present invention.

FIG. 2 is a block diagram showing the output data of each component in the first embodiment of the answering machine according to the present invention.

FIG. 3 is a block diagram showing numerical values of specific memory capacities of the DRAM memory unit and the flash memory unit in the first embodiment of the answering machine according to the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional answering machine.

[Explanation of symbols]

11 ... Line interface, 11a, 15b ... Voice data, 12 ... Compressor, 12a, 13a ... High-quality compressed voice data, 12b, 14a ... Low-quality compressed voice data, 13 ... DRAM memory section, 14 ... Flash memory section, 15 ... Stretcher, 16 ... Speaker.

Claims (3)

(57) [Claims] 1. A connected to the communication line, and the line-in tough Esu receiving voice data, the voice data received by the line-in tough Esu predetermined
This frequency is sampled at the frequency
The audio data received by a relatively high sound quality compressed audio data and the line-in tough Esu after encoding at a constant compression rate sampled at a lower frequency than the predetermined frequency, the sampling signal of the predetermined A compressor for outputting compressed voice data of relatively low sound quality after being encoded at a compression ratio higher than the compression ratio , and the normal accumulation of the compressed sound data of the high sound quality output from the compressor. A DRAM memory section for storing the data, a flash memory section for storing the low-quality compressed audio data output from the compressor as a backup, and a DRAM memory section for storing the high-quality compressed audio data during reproduction. It was by decompressing the compressed audio data of the high sound quality supplied to the speaker, and stored in the flash memory at the time of reproduction of the compressed audio data of the low-quality Telephone answering device, characterized in that it comprises a stretcher supplied to speakers by decompressing the compressed audio data of low quality, the. 2. The answering machine according to claim 1, wherein the DRAM memory unit has a memory capacity of 32 Mbits. 3. The answering machine according to claim 1, wherein the flash memory unit has a memory capacity of 2 Mbits.