JPS6058762A - Voice storage method - Google Patents

Abstract

PURPOSE:To attain efficient storage by adding a code rate converting function and decreasing the code rate for restorage to a degree where business is transmitted from talking when the voice data is stored for the confirming of transmitted data or the received data is stored after being heard once. CONSTITUTION:The analog signal of an input voice from an input device 15 and an analog signal from a communication line interface 17 are converted into a digital signal by a digital coding section 12. The digital signal or the voice digital signal received by the interface 17 is controlled by the operation/control circuit 19 of a processor section 18, transferred once to a storage circuit 21 and transferred further to a storage section 22 and stored. In converting the digital sound, the processor section 18 reads the digital signal from the storage section 22, transmits the signal to a digital sound converting section 11, and after the signal is converted into an analog signal by an analog decoding section 13, the result is inputted to the digital coding sectiin 12 through a converting circuit 14, converted into the digital signal in other coding system with without the coded rate and stored again in the storage section 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for storing received sound information and transmitted sound information in a sound information communication device having at least a communication line connection function and a data storage function.

<Background> Since conventional devices of this type perform encoding and decoding at a single rate, they can only save audio information at the encoding rate at which it was input. In audio digital transmission, generally 6
4 kb/s PCM is used. Although this is of high quality, a storage device with a large capacity is required to store it, leading to an increase in the cost of the device itself, or only a small amount of information can be stored. Although it is conceivable to store sound data at a low encoding rate to meet storage capacity limitations, there is a risk that it will not be possible to sufficiently identify the speaker, convey the atmosphere, or convey the content of the conversation.

<Summary of the invention> From these points, the first invention provides a sound information communication device,
A function to convert the encoding rate is added, and the received digital sound data is played back as at least one homophone, and it is stored at the same encoding rate until the receiver hears it, and after playing it back. Convert to a lower encoding rate and store. Therefore, if you receive sound data with a high encoding rate, play back the high quality sound data, listen to it as sound, and then store this sound data as a memo, you will roughly know its contents. By lowering the encoding rate and storing it, the storage unit can be used effectively.

This second invention similarly adds a function to convert the encoding rate to the sound information communication device, stores sound input as digital sound data with a relatively high encoding rate, and transmits this sound data at a relatively high encoding rate. The encoding rate is used to transmit sufficient information to the other party, but if the transmitted content is to be stored as a memo, the encoding rate is lowered. Alternatively, once accumulated sound data is stored at a high encoding rate while it is used relatively frequently, when the data becomes old or is used less frequently, it can be encoded according to the operator's instructions. By re-storing at a lower conversion rate, the storage section can be used effectively.

<Embodiment> FIG. 1 shows an example of a sound information communication device to which the sound storage method of the present invention can be applied. FIG. 1 shows an example of a sound information communication device, in which a digital sound converter 11 functionally includes a digital encoder 2, an analog decoder 13, and a converter . An input device 15 such as a microphone or a pickup coil of a telephone, an output device 16 such as a speaker, a communication line interface 17, and a processor section 18 are connected to the digital sound conversion section 11.

The processor section 18 functionally includes an arithmetic/control circuit 19, a storage circuit 21, etc., and is connected to a storage section 22 such as a magnetic disk or magnetic tape, a display section 23, and a character/command input section 24 such as a keyboard.

The arithmetic/control circuit 19 of the processor section 18 is implemented by software as the digital sound conversion section 11 and the communication line interface 1.
7 and the storage section 22'.

When inputting sound, the input sound is converted into an analog electrical signal by the input device 15 and inputted to the digital encoding section 12, where it is converted into a digital signal.

Or communication line interface 17 through a communication line.
The analog signal of the sound received by the digital encoder 12
is converted into a digital signal. The digital signals converted by the digital encoder 12 or the audio digital signals received by the interface 17 through the communication line are controlled by the arithmetic/control circuit 19 of the processor 18 and are temporarily transferred to the storage circuit 21, where they are further processed. The data is transferred to the storage unit 22 and stored therein.

When outputting sound, the digital signal is read out from the storage section 22 under the control of the arithmetic/control circuit 19 of the processor section 18 and transferred to the analog decoding section 13, and the digital signal is converted into an analog signal and sent through the output device 16. Output. Alternatively, the analog signal converted from the analog decoding section 13 is output to the analog communication line through the communication line interface 17, or the digital signal read from the storage section 22 is output to the communication line through the communication line interface 17.

To convert the digital sound, the processor section 18 reads out the digital signal from the storage section 22 and converts it to the digital sound conversion section 11.
send to In this case, first, the digital signal is converted into an analog signal by the analog decoding section 13, and this analog signal is inputted to the digital encoding section 12 through the conversion circuit 14 to be converted to other encoding methods, /''!, take code, etc. The converted digital signal is stored again in the storage section 22.

The character/command input section 24 is used for starting and ending input/output of sounds, inputting conversion methods, and giving instructions. Further, the display unit 23 is used to monitor the execution state.

A specific example of the digital sound conversion section 11 is shown in FIG. This example uses 64 kb/sP CM codec 51 and 32
When using a kb/s ADM (adaptive delta modulation) codec 52 and a 16 kb/s AD-PCM (adaptive differential modulation) codec 53, the analog signal from the multiplexer 54 is sent to buffer amplifiers 55, 56, and 57, respectively. are supplied to codecs 51, 52, and 53 through these codecs 5
The digital data encoded by 1, 52, and 53 are respectively supplied to serial/parallel converters 61, 62, and 63.

Digital data converted into serial data from these serial/parallel converters 61, 62, and 63 is input to the processor section 18 through a data line 64.

On the other hand, digital data input through the signal line 64 from the processor section 18 is transferred to parallel-to-serial converters 65, 66 .
At 67, the signals are converted into parallel digital data and input to codecs 51, 52.53, where they are decoded into analog signals. One of these analog signals can be taken out by a multiplexer 68, and the taken out analog signal is sent to the multiplexer 54, the output device 16,
Output is sent to any of the communication line interfaces 17. The multiplexer 54 is connected to the input device 15 or the multiplexer 6
Select the analog signal from any of the buffer amplifiers 51 . , 52 and 53.

The processor section 18 includes a multiplexer 54. , 68.6
9 can be controlled through signal lines 71, 72, and 73, respectively, and the codecs 51, 52, and 53 can be controlled in an enabled state and a disabled state through signal lines 74, 75, and 76, respectively. It can be done.

Further, the serial/parallel converters 61, 62, 63 and the parallel/serial converters 65, 66, 67 have three-state buffers, and are connected to signal lines 77, 78, . . . from the processor section 18, respectively.
79 again 8 1. , 82 and 83, the output impedance of these converters can be made infinite and the output side can be controlled to a state where the output side is substantially disconnected and a state where output is possible. can be sent. The control signals on the signal lines 77 and sl are applied to the activation and clock terminals of the codec 51 through the OR circuit 84, and the control signals on the signal lines 78 and 82 are applied to the activation and clock terminals of the codec 52 through the OR circuit 85. The control signal of 79°83 is OR
It is applied to the startup and clock terminals of the codec 53 through a circuit 86.

Note that the multiplexers 54, 68, 69 are a kind of analog switches, and the buffer amplifiers 55, 56, 57 prevent analog signals from influencing each other between the codecs 51, 52, 53.

When encoding an analog signal, the processor section 18 connects a multiplexer 54 to the input device 15 side, and selects one codec, for example, a 64 kb/s codec 51, depending on the intended encoding format and encoding rate. The serial-to-parallel converter 61 is made operational. The input device 15 analog signal passes through a multiplexer 54 and further into buffer amplifiers 55, 56.5.
7 to the codecs 51, 52, and 53.

Processor section 1 in these codecs 51, 52, 53
The 6 4 kb/sP CM codec 51 activated by the 6 4 kb/sP CM codec 51 digitally encodes the input analog signal, and the digital data is transferred to the processor unit 18 through the serial/parallel converter 61 . When outputting digital data, for example, the 64 kb/s PCM codec 51 is activated and the parallel-to-serial converter 65 is activated depending on the encoding format and encoding rate of the digital data.
is activated and multiplexer 68 is connected to its codec 51. From the processor section 18 to the data line 6
The digital data inputted through 4 is converted into serial data by a parallel-to-serial converter 65, and further converted into serial data by a codec 51.
is decoded into an analog signal by The analog signal passes through the multiplexer 68 and is sent to the output device 16 or the communication line interface 17 depending on the connection state of the multiplexer.
Output to.

Next, the conversion operation will be explained using an example in which 32 kb/s ADM digital data is converted to 16 kb/s AD-PCM digital data. Connect the multiplexer 54 to the multiplexer 69 side, and connect the multiplexer 68 to the 32
kb/sA D M codec 52 side, multiplexer 69 is connected to multiplexer 54 side, and the codec 52, 53, parallel-to-serial converter 66, and serial-to-parallel converter 63 are made operational. The 32 kb/s ADM digital data from the processor section 18 is input to the 32 kb/s ADM codec 52 through the parallel-to-serial converter 66 and decoded into an analog signal. This analog signal passes sequentially through multiplexers 68, 69.54, and is further inputted to codecs 51, 52.53 through buffer amplifiers 55, 56.57, and is encoded into digital data by the operational codecs 52.53, respectively. , of which 16 kb/s AD-PCM digital data is input to the processor section 18 through the serial/parallel converter 63.

FIG. 3 shows an example of operation for converting the encoding rate.

In step S1, a signal is sent from the processor section 18 to the converter section 14, that is, the multiplexer 54, 68, .
69 to set a bus that connects the output side of the analog decoding section 13 to the input side of the digital encoding section 120.

In step S2, the processor section 18 extracts the audio data from the storage section 22, passes it through the storage circuit 21, and sends it to the analog decoding section 13.

In step S3, the audio data is converted into an analog signal, and in step S4, it is sent to the digital encoder 12 through the nose. In step S5, the analog signal is converted into a digital signal at a different encoding rate than the analog decoding section 13. In step S6, this digital signal is stored again in the storage section 22 via the storage circuit 21. In step S7, these operations are repeated until all sound data is completed. The above operation selects the multiplexer 68 and the codec so as to lower the encoding rate, but there is no need to convert at the encoding rate, so the codecs 51, 52, and 53 change the encoding rate using the same conversion method. You can use different codecs, and still only need two codecs.

1. Examples of the operation of the storage method according to the present invention are shown in FIGS. 4 to 7. In Fig. 4, when inputting and storing sounds, the conversion flag is set to 0FF (@0''') in step S8, and the encoding rate for the input sound is not reduced.In step S9, Fig. 1 was explained. In this way, sound is input from the input device, and this is stored as digital sound data in the storage section 22 via the processor section 18.This operation is performed until the input is completed by step SIO.At this time, the digital encoding section The encoding rate in 12 is generally relatively high, for example 64 kb/s.In this way, high quality sound data is stored.

When receiving sound data through a communication line, turn on the conversion flag (“1”) in step Sit as shown in Figure 5.
Then, in step S12, the sound data is received and stored.

In this case, if the received data is an analog signal, it is converted to a digital signal at a relatively high encoding rate, and then stored.
If the received data is a digital signal, the received data with a relatively high encoding rate is stored as is.

In the case of transmission, as shown in FIG. 6, in step S13, the converter 14 is connected as described in the conversion operation in FIGS. 1 and 2, and the digital sound converter 11 converts the low encoding rate. Set to convert to data. In step S14, necessary sound data is read from the storage section 22 and transmitted via the storage circuit 21 and the communication line interface 17, and the read sound data is sent to the digital sound conversion section 11 to convert it into low encoding rate sound data. , and is stored again in the storage unit 22. At the same time, in step S15, the conversion flag for the re-stored sound data is set to "0"' to indicate that the encoding rate has been lowered.

The sound data transmitted in this way has a high encoding rate,
The data is sent with high quality, and the storage for recording that such data has been sent is performed at a low encoding rate, so that the storage unit 22 is effectively utilized.

FIG. 7 shows the case of output. First, in step 816, the conversion flag is checked and if it is ON, in step S17, the conversion flag is set to @0'' and the conversion flag is turned OFF.

After this, in step 81B, the audio data from the storage section 22 is decoded by the analog decoding section 13 and outputted as audio from the output device, and at the same time, the decoded analog signal is encoded by the digital encoding section 12 to lower the encoding rate. This process is repeated in step S19 until the zero-tone data to be re-stored in the storage section 22 is completed or an instruction to end the output is given. In this way, the sound data is reproduced with high quality, and once reproduced, the encoding rate is lowered and the sound data is stored again.

If the conversion flag is OFF in step S16, the sound data has already been played once or has been transmitted, and this sound data has been decoded by the analog decoding unit 13 in step S20. The data is outputted to the output device, and is repeatedly outputted in step S21 without performing any conversion or the like until the end of the audio data or an instruction to end the output is given.

In this way, for example, if you add a conversion flag to audio data and write encoding rate change information to this conversion flag in each of the situations described above, the conversion flag will be added the next time you access the audio data. It is possible to perform audio processing according to the state of the voice.

This allows the sound encoding rate to remain relatively high after the sound data is received, until the receiver listens to the received data once or sends the recorded sound, or until it is no longer important to meet this condition. After that, the storage section 22 can be effectively used by automatically reducing the encoding rate or by lowering the encoding rate according to an operator's instruction and re-storing the data. The storage circuit 21 may also serve as the storage section 22.

<Effects> As explained above, when the storage method of the first invention is used, the encoding rate of the received audio is lowered after listening at least once, and when the storage method of the second invention is used, the encoding rate of the received audio is lowered. In some cases, storage is performed at a lower encoding rate, and in other cases, storage can be performed at a higher quality encoding rate. Therefore, when saving audio data to confirm outgoing data or saving received data after listening to it, the encoding rate can be lowered to a level that can convey the message, making it efficient. It has the advantage of being able to accumulate.

However, data such as input audio and transmitted audio has the advantage of conveying additional information such as a high-quality atmosphere.

[Brief explanation of the drawing]

11th (1) is a block diagram showing an example of a sound information communication device to which the present invention is applied; FIG. 2 is a block diagram showing an example of a digital sound converting section in FIG. 1; FIG. A flowchart showing an example of operation during encoding rate conversion, Fig. 4 is an operation flowchart when audio is input, Fig. 5 is an operation flowchart when receiving, Fig. 6 is an operation flowchart when transmitting, and Fig. 7 is an audio output flowchart. It is an operation flowchart of the time. 11: Digital sound conversion section, 12: Digital encoding section, 13: Analog decoding section, 15: Input device, 16: Output device, 17: Communication line interface, 18: Processor section, 19: Arithmetic/control circuit, 21 :Memory circuit, 22
: storage section, 23: display section, 24: character/command input section. Patent applicant: Takashi Kusano (16), agent of Nippon Telegraph and Telephone Public Corporation

Claims (2)

[Claims] (1) When adding a function to convert the encoding rate of digital sound data to a sound information communication device that has at least a connection function to a communication line and a storage function, and storing and storing digital sound data received from the line, A sound storage method in which received digital sound data is stored at the encoding rate at the time of reception until the receiver reproduces the received digital sound data at least once as a sound, and after reproduction, the data is stored again at a lower encoding rate. (2) Add a function to convert the encoding rate of digital sound data to a sound information communication device that has at least a connection function to a communication line and a storage function, and after storing sound input as digital sound data, A voice storage method that lowers the encoding rate and re-stores the accumulated digital sound data upon instruction or when transmitting the sound data to a communication line.