JPH07123192A - Fax machine - Google Patents

Abstract

PURPOSE:To reproduce a recorded voice signal without changing the frequency through reduction. CONSTITUTION:A voice processing section 1 has an A/D converter section 2, a recording section 3, a data processing section 4 and a D/A converter section 5. The A/D converter section 2 converts a received analog voice signal into a digital voice signal, and the recording section 3 stores the converted digital voice signal. The data processing section 4 interleaves data from the stored digital voice signal in matching with the reproduction speed. The D/A converter section 5 converts the interleaved digital voice signal into an analog voice signal and the reproduced voice signal is reduced without changing the frequency, then it is prevented that the reproduced voice is high-pitched resulting in causing unease of hearing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine, and more particularly to a facsimile machine with a telephone function capable of changing the reproduction speed and frequency when reproducing a conversation.

[0002]

2. Description of the Related Art Recently, the speed of information processing has been emphasized, and in reproducing a prerecorded sound by a tape recorder, the time can be shortened by reproducing it at a speed higher than usual such as double speed. There are times when you want to let it. When playing back at double speed,
Since the audio signal shown in the explanatory view of (a) is reproduced as an audio signal having a double frequency as shown in FIG. 5 (b), the sound is high in the human ear and extremely hard to hear.

Also, in telephone communication, since the nature of voice changes depending on the person or the situation, the voice frequency should include many frequency components other than "0.3 to 3.4 KHz" which is the frequency band of telephone communication. There is also. In such a situation, when listening to the recorded voice, the voice of the other party may be difficult to hear or may be erroneously heard. On the other hand, in the telephone set disclosed in Japanese Patent Laid-Open No. 1-123554,
By making changes such as emphasizing the high frequency part of the audio signal sent from the other party and reproducing the audio, clear audio can be heard.

[0004]

However, since the telephone set disclosed in Japanese Patent Laid-Open No. 1-123554 does not make the sound itself low-pitched or high-pitched, the case where the frequency becomes high when reproduced at double speed Can not get the effective effect.

In addition, in the above-mentioned telephone, noise may be emphasized if the noise processing is not sufficiently performed, and the voice may become unclear.

Further, there is a facsimile machine with a telephone function having a function of reproducing a voice recorded by an answering machine. In such a facsimile machine, there is a case where it is desired to reproduce the voice recorded at a double speed and confirm the recorded voice in a short time.

The present invention has been made to solve the above disadvantages, and an object of the present invention is to obtain a facsimile apparatus which converts recorded sound into a frequency that is easily heard by a person and reproduces it.

[0008]

In the facsimile apparatus according to the present invention, the voice processing section includes an A / D conversion section, a recording section and a data section.
It has a data processing unit and a D / A conversion unit, the A / D conversion unit converts an input analog audio signal into a digital audio signal, the recording unit stores the converted digital audio signal, and the data processing unit Data is thinned out from the stored digital audio signal in accordance with the reproduction speed, and the D / A converter converts the thinned digital audio signal into an analog audio signal.

The voice processing section includes a cycle detecting section and a transmitting section, and the data processing section includes a comparing section, an expanding / contracting section and an inserting section.
The cycle detecting section detects the cycle of the digital audio signal stored in the recording section, and the transmitting section outputs the cycle signal of the reference cycle for converting the cycle of the digital audio signal into a constant cycle, and the comparison of the data processing section. The section compares the cycle of the detected digital audio signal with the cycle of the periodic signal output by the transmission section, and the expansion / contraction section expands / contracts the digital audio signal according to the frequency output from the comparison section based on the comparison result of the comparison section, and interpolates. When the digital audio signal is expanded, the unit interpolates data corresponding to the slope of the digital audio signal into the digital audio signal.

[0010]

In the present invention, the voice processing section has an A / D conversion section, a recording section, a data processing section and a D / A conversion section. A
The / D converter converts the input analog audio signal into a digital audio signal, and the recording unit stores the converted digital audio signal. The data processing unit thins out data from the stored digital audio signal according to the reproduction speed. The D / A converter converts the thinned digital audio signal into an analog audio signal and shortens the reproduced audio without changing the frequency.

Further, the voice processing section includes a cycle detecting section and a transmitting section. The data processing section includes a comparison section, a stretchable section, and an interpolation section. The cycle detecting section detects the cycle of the digital audio signal stored in the recording section, and the transmitting section outputs a cycle signal of a reference cycle for converting the cycle of the digital audio signal into a constant cycle.
The comparison unit of the data processing unit compares the cycle of the detected digital audio signal with the cycle of the periodic signal output by the transmission unit, and the expansion / contraction unit adjusts the digital audio according to the frequency output by the transmission unit from the comparison result of the comparison unit. The signal is expanded and contracted, and when the digital audio signal is expanded, the interpolation unit interpolates the digital audio signal with data that matches the slope of the digital audio signal, and keeps the frequency of the output signal constant.

[0012]

1 is a block diagram showing an embodiment of the present invention. As shown in the figure, the voice processing section 1 of the facsimile apparatus according to the present invention has an A / D conversion section 2, a recording section 3, a data processing section 4 and a D / A conversion section 5, and the entire facsimile apparatus. It is connected to the operation unit 6 via a main control unit 7 for controlling.

The A / D converter 2 receives an analog voice signal in telephone communication and converts it into a digital voice signal. The recording unit 3 stores the digital signal converted by the A / D conversion unit 2. The data processing unit 4 thins out the data of the digital audio signal stored in the recording unit 3 in accordance with the reproduction speed instruction input from the operation unit 6. The D / A converter 5 converts the thinned digital audio signal into an analog audio signal.

The operation of the voice processing unit 1 incorporated in the facsimile apparatus having the above-described structure when the voice signal is reproduced at double speed will be described with reference to the flowchart of FIG.

When storing a voice message received from an external telephone, the main controller 7 instructs the A / D converter 2 to input an analog voice signal. The A / D conversion unit 2 inputs the received analog audio signal and converts the input analog signal into a digital audio signal. The main controller 7 sends the signal converted by the A / D converter 2 to the recorder 3, and the recorder 3 stores the sent digital audio signal (step S).
1).

When a reproduction instruction at double speed is input from the operation unit 6 of the facsimile apparatus and the input of the reproduction instruction is transmitted to the main control unit 7, the main control unit 7 instructs the data processing unit 4 to start processing. (Step S2). The data processing unit 4 reads the digital audio signal stored in the recording unit 3, and since double speed is instructed, the read digital audio signals are thinned out every other interval in order to halve the signal length. (Step S3). The main control unit 7 outputs the thinned digital audio signal D
And sends to the / A converter 5. The D / A converter 5 converts the thinned digital audio signal into an analog audio signal and outputs it (step S4). Here, since every other data of the digital audio signal is converted into the thinned-out analog audio signal,
The length of the audio signal can be halved without changing the sampling period and the frequency of the digital audio signal.

In the above embodiment, the case where the reproduction is performed at the double speed has been described. However, as another embodiment, a facsimile apparatus which lowers and outputs to a certain frequency when a high frequency audio signal is input The built-in voice processing unit 1 will be described.

As shown in the configuration diagram of FIG. 3, the voice processing unit 1 incorporated in the facsimile apparatus includes an A / D conversion unit 2, a recording unit 3, a D / A conversion unit 5, a transmission unit 8, and a cycle detection unit 9. And a data processing unit 10.

The transmitter 8 outputs a signal having a voice cycle which is easy for humans to hear. The cycle detection unit 9 detects the inclination of the digital audio signal stored in the recording unit 3, detects two adjacent points where the inclination becomes positive to negative, and detects the cycle of the digital audio signal from the detected two points. The data processing unit 10 reads the digital signal stored in the recording unit 3. The comparison unit 101 of the data processing unit 10 compares the period of the signal output by the transmission unit 8 with the period of the digital audio signal detected by the period detection unit 9. The expansion / contraction unit 102 of the data processing unit 10 is the comparison unit 1.
If the comparison result of 01 is, for example, as shown in the explanatory diagram of FIG. , Fig. 4
As shown in (b), the data processing unit 10 moves the data of the digital audio signal to double the cycle. The interpolation unit 103 of the data processing unit 10 obtains, for example, the average value of adjacent data as data to be inserted, and as shown in FIG. Insert the data according to the inclination of. In the figure, the data portion obtained by sampling by the A / D conversion unit 2 is represented by a black circle, and the data portion inserted by the interpolation unit 103 of the data processing unit 10 is represented by a star mark. The D / A converter 5 converts the digital audio signal into an analog audio signal. Here, since the data processing unit 10 doubles the cycle of the digital audio signal according to the cycle of the transmission unit 8, the cycle of the analog audio signal output from the D / A conversion unit 5 is the transmission unit 8. It becomes a cycle that matches the cycle of. Thus, even if an audio signal having a high frequency and hard to hear is input, it can be converted into an audio signal having a frequency that is easily heard by a person and output.

In the above embodiment, the case where the period of the signal output from the transmitting unit 8 is twice the period of the digital audio signal has been described. Conversely, the period of the digital audio signal is larger than the period of the transmitting unit 8. In this case, the data of the digital audio signal is removed according to the cycle of the transmitting section. As a result, it is possible to turn low-pitched sounds that are difficult to hear into high-pitched sounds.

Further, in the first embodiment, when reproducing at double speed, the data of the digital audio signal is thinned out every other data, but the data may be thinned out every other cycle.

[0022]

As described above, the present invention converts an input analog voice signal into a digital voice signal and stores it. Data is thinned from the stored digital audio signal in accordance with the reproduction speed. The digital audio signal after thinning out,
Since it is converted into an analog audio signal, the reproduced audio can be shortened without changing the frequency. Since the frequency does not change even if the reproduced voice is shortened, it is possible to prevent the reproduced voice from becoming too high and difficult to hear.

Further, when the detected period of the digital audio signal and the period of the periodic signal of the reference period are compared, the digital audio signal is expanded and contracted according to the frequency of the periodic signal generated from the comparison result, and the digital audio signal is expanded. Interpolates data according to the slope of the digital audio signal and keeps the frequency of the output signal constant, so even if a high or low frequency audio signal is input, It can be converted into an audio signal and reproduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a configuration diagram of another embodiment.

FIG. 4 is an explanatory diagram illustrating signal conversion of another embodiment.

FIG. 5 is an explanatory diagram illustrating a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 voice processing section 2 A / D conversion section 3 recording section 4 data processing section 5 D / A conversion section 6 operation section 7 main control section 8 transmission section 9 cycle detection section 10 data processing section 101 comparison section 102 expansion / contraction Part 103 Interpolation part

Claims (2)

[Claims] 1. A facsimile apparatus including a voice processing unit for recording and reproducing voice in telephone communication, the voice processing unit having an A / D conversion unit, a recording unit, a data processing unit and a D / A conversion unit. Then, the A / D conversion unit converts the input analog audio signal into a digital audio signal, the recording unit stores the converted digital audio signal, and the data processing unit matches the reproduction speed,
Data is thinned out from the stored digital audio signal, and D / A
A facsimile machine characterized in that the conversion unit converts the thinned digital audio signal into an analog audio signal. 2. The voice processing section comprises a cycle detecting section and a transmitting section, the data processing section comprises a comparing section, an expanding / contracting section and an interpolating section, and the cycle detecting section comprises the cycle of the digital audio signal stored in the recording section. Then, the transmitting unit outputs a periodic signal of a reference period for converting the period of the digital audio signal into a constant period, and the comparing unit of the data processing unit outputs the detected period of the digital audio signal and the output of the transmitting unit. Compared with the period of the periodic signal, the expansion / contraction unit expands / contracts the digital audio signal according to the frequency output by the transmission unit from the comparison result of the comparison unit, and the interpolation unit outputs the digital audio signal when the digital audio signal is expanded. 2. The facsimile apparatus according to claim 1, wherein data matching the inclination of the digital voice signal is inserted into the facsimile.