JP3286326B2 - Digital telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital telephone.

[0002]

2. Description of the Related Art Conventionally, there is known a telephone in which an incoming voice signal is stored in a storage unit so that a user can check the content at any time.

As a method of storing audio signals in such a telephone, a method using a magnetic tape or a method using a semiconductor memory is generally adopted.

However, in the method using a magnetic tape,
A magnetic head for recording / reproducing, a tape drive mechanism, and the like are required, and the number of parts increases and the sound quality deteriorates. In addition, when a semiconductor memory is used, the signal is converted into a signal format that can be stored in the semiconductor memory. An analog / digital converter for converting an analog signal into a digital signal, an encoding circuit for encoding this digital signal, a decoding circuit for decoding a stored signal into an original digital signal, and converting the decoded digital signal into an analog signal This requires a digital / analog converter to convert the data into a digital signal, and the circuit configuration is complicated.

In recent years, digital audio signals have been transmitted /
Construction of a digital telephone line network for receiving is progressing,
Also in the digital telephone network, the function of storing the incoming voice as described above is desired.

[0006]

SUMMARY OF THE INVENTION The present invention achieves the function of storing incoming voice in a digital telephone line network with a simple circuit configuration.

[0007]

SUMMARY OF THE INVENTION A digital telephone according to the present invention comprises: a voice input unit; an analog / digital conversion unit for converting a voice signal input to the voice input unit into a digital signal; An audio encoding unit that encodes the digital signal from the conversion unit into a compressed audio code, an error correction code adding unit that adds an error correction code to the compressed audio encoded signal from the audio encoding unit, A transmitting unit for transmitting a voice coded signal added with an error correcting code obtained from the error correcting code adding unit to a digital line, and a receiving unit receiving a voice coded signal added with the error correcting code from the digital line And an error correction unit that corrects an error in the audio code of the audio encoded signal based on the error correction code added to the audio encoded signal obtained from the receiving unit. A speech decoder for decoding encoded audio signal into a digital signal obtained error is corrected,
A digital / analog conversion unit for converting a digital signal decoded by the audio decoding unit into an analog signal, an audio output unit for outputting an audio signal based on the analog signal from the digital / analog conversion unit, A storage unit capable of storing an audio encoded signal in which an error obtained from the unit has been corrected, and a storage of the audio encoded signal to the storage unit and a read of the audio encoded signal from the storage unit in response to an operation input. And a control unit for controlling.

[0008]

According to the present invention, when the user instructs the storage operation of the incoming voice, the compressed voice coded signal received by the receiving unit is supplied to the storage unit under the control of the control unit.
It is memorized. Also, when the user issues a read operation instruction to read the contents stored in the storage unit, the compressed audio encoded signal stored in the storage unit is read under the control of the control unit, and the audio decoding is performed. After being decoded by the section, it is converted into an analog signal and output.

FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a digital telephone line, 2 denotes an audio input unit including a microphone and an amplifier for amplifying an audio signal input to the microphone, and 3 denotes an analog converter for converting an analog audio signal from the audio input unit 2 into a digital signal. And a digital conversion unit 4 for limiting the band of the audio signal converted to a digital signal by the analog / digital conversion unit 3 and compressing information to convert the audio signal into a predetermined encoded signal. An error correction code adding unit for adding an error correction code for correcting a code error occurring during transmission to the audio signal encoded by the audio encoding unit 4; and 6, an audio encoded signal to which an error correction code is added Is converted into a predetermined transmission signal format and transmitted, a transmission unit 7 is connected to a digital telephone network and controls transmission / reception, and 8 is a transmission / reception control unit 7 from the transmission / reception control unit 7. A receiving unit that receives the signal and converts the received signal into a predetermined signal format; 9 is an error correcting unit that corrects an error in the received signal based on an error correction code added to the received signal from the receiving unit 8; The storage unit capable of storing the audio coded signal in which the error has been corrected by the correction unit 9 includes a semiconductor storage device 10A and an address control unit 10B for controlling an address of the semiconductor storage device. 11
Is a voice decoding unit for decoding the compressed voice coded signal into the original digital signal, 12 is a digital / analog conversion unit for converting the digital signal decoded by the voice decoding unit 11 into an analog signal, 13 is An amplifier for amplifying an analog signal from the digital / analog converter 12 and an audio output unit including a speaker driven by the output of the amplifier;
4 is a control unit that outputs various control signals in accordance with a user's operation command, and 15 is a control unit that outputs a control signal from a control unit 14.
The speech coded signal from the error correction unit 9 is supplied to the storage unit 10, the speech coded signal from the error correction unit 9 is supplied to the speech decoding unit 11, or the speech coding stored in the storage unit 10 is performed. The switch unit determines whether to supply a signal to the audio decoding unit 11.

Next, the operation will be described. During normal operation, the user's voice is amplified by the voice input unit 2,
The signal is converted into a digital signal by the analog / digital conversion unit 3, then subjected to processing such as band limitation and information compression, and is further subjected to an error correction code adding unit 5 to generate an error correction code for correcting a code error generated during transmission. Sent with addition.

On the other hand, the speech coded signal supplied via the digital telephone network 1 is converted into a predetermined speech coded signal by a transmission / reception control unit 7 and a reception unit 8 and then converted by an error correction unit 9. error of the audio data in accordance with the state of the error correction code of the received signal is corrected in, then the speech decoding unit 11
Is decoded into the original digital signal. Then, the decoded digital signal is supplied to the digital / analog conversion unit 12.
After being converted into an analog signal, the signal is supplied to the audio output unit 13 and output as audio.

Now, when the user operates the storage key to store the contents of a call or operates the answering machine key to achieve the answering machine function, the control unit 14
Supplies a control signal to the switch unit 15 in response to the operation of the key to set a state in which the speech coded signal from the error correction unit 9 is supplied to the storage unit 10 and supplies a control signal to the storage unit 10 Then, the storage unit 10 is set to the storage state.

The coded speech signal supplied from the digital telephone network 1 is supplied to an error correction unit 9 via a transmission / reception control unit 7 and a reception unit 8, and the error correction unit 9
After the error occurring in is corrected, the error is supplied to the storage unit 10 via the switch unit 15 and stored in the storage unit 10.
At this time, the audio encoded signal is stored at the address of the semiconductor memory device 10A specified by the address controller 10B.

Thereafter, when the user performs a key operation for reproduction, the control unit 14 responds to the key operation to switch the switch unit 1.
A control signal is supplied to the storage unit 5 to set the storage unit 10 and the audio decoding unit 11 to be connected, and a control signal is supplied to the storage unit 10 to set the storage unit 10 to a read state.

The semiconductor memory device 10 of the storage unit 10
A is sequentially read out from the address specified by the address controller 10B, and the data stored in the
Feed to 1.

The audio decoding unit 11 decodes the encoded audio data from the storage unit 10 and limits the band, and decodes the encoded digital signal into an uncompressed digital signal. The decoded digital signal is then converted into an analog signal by a digital / analog converter 12, it is outputted as a sound by the audio output unit 13.

The present invention is not limited to the above-described embodiment, and for example, a transmission / reception control unit can be omitted. Further, it goes without saying that the digital telephone line network can be applied not only to a wired type as in the embodiment but also to a wireless type such as a digital portable telephone, a digital car telephone, and a digital cordless telephone.

[0018]

According to the present invention, the incoming call content can be stored only by providing a storage unit capable of storing the encoded voice signal received by the receiving unit, and the incoming call content storage function in the digital telephone is provided. And an answering machine function can be achieved with a simple configuration. In addition, since the encoded voice signal stored in the storage unit is a signal compressed at the time of transmission, it can be stored for a long time and is simple.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Digital telephone network 2 Voice input part 3 Analog / digital conversion part 4 Voice encoding part 5 Error correction code addition part 6 Transmission part 8 Reception part 9 Error correction part 10 Storage part 11 Voice decoding part 12 Digital / analog converter 13 Audio output unit 14 Control unit 15 Switch unit

Continuation of the front page (56) References JP-A-2-36656 (JP, A) JP-A-58-164396 (JP, A) JP-A-2-108332 (JP, A) JP-A-60-58762 (JP, A) , A) JP-A-1-17762 (JP, A)

Claims (1)

(57) [Claims] 1. An audio input unit, an analog / digital conversion unit for converting an audio signal input to the audio input unit into a digital signal, and a voice obtained by compressing a digital signal from the analog / digital conversion unit. An audio encoding unit that encodes the code, and the compressed audio from the audio encoding unit
Error correction code addition to add error correction code to encoded signal
Section and the error correction code obtained from the error correction code adding section.
The encoded signal to the digital line.
Transmitter and the error correction code from the digital line.
Receiving section for receiving the encoded voice signal, and the receiving section
Error correction code added to the resulting encoded audio signal
Error correcting speech code error based on speech coded signal
The correction section and the error obtained from the error correction section are corrected.
Audio decoding that decodes the encoded audio signal into a digital signal
Unit and the digital signal decoded by the audio decoding unit.
A digital / analog converter for converting to an analog signal,
Based on the analog signal from this digital / analog converter
An audio output unit for outputting an audio signal;
The error-corrected speech coded signal obtained from
A storage unit to obtain, and a voice note to the storage unit in response to an operation input.
Of encoded signals and speech encoded signals from the storage unit
And a control unit for controlling the reading of data.
Digital telephone.