JPH1186431A - Speaking velocity converting and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the discarding of the signals between the speech blocks sections to be reproduced and to suppress the missing of reproduction tones by controlling the reproduction velocity from a recording medium according to the writing state of a detected memory. SOLUTION: A memory I/F:6 writes the digital signals subjected to speaking velocity conversion processing and given by a DSP 5 into the ring memory 7 and applies the signals to the memory status terminal MS of a microcomputer 9. The computer 9 detects the writing state of the ring memory 7 by the presence or absence of the input to the memory status terminal MS and counts writing stop periods by incrementing an internal counter value unless the writing is in cause of action. When the count value attains the threshold value, the computer 9 applies a deceleration command to a motor driving circuit 17 and properly commands the reading out timing by the D/A converter 10. The reproduction velocity is decelerated and recording signals are reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an n-times speed (n> 1).
In the case of a speech speed conversion / reproduction device that converts the speed of the audio signal to approximately the standard speed and outputs the converted signal, for example, a video tape recorder, the standard speed video signal and the standard speed audio signal recorded on the magnetic tape are reproduced at n times speed. The present invention relates to a speech speed conversion / reproduction device which converts the speed of this n-times speed audio signal to a substantially standard speed and outputs an n-times speed video signal and a speed-converted standard speed audio signal.

[0002]

2. Description of the Related Art A speech speed converter for converting an input n-speed audio signal into a substantially standard speed and outputting the speed-converted audio signal has been proposed in Japanese Patent Application Laid-Open No. Hei 8-147874 by the present applicant. I have. The speech speed conversion device includes a ring memory for writing an audio signal to be output. The ring memory is a memory in which the pointer of the last item of the chained list points to the first item of the chained list. Such a structure is called a ring structure
That. The input n-times speed audio signal is written into the ring memory after the signal in the voice section is converted to a substantially standard speed, and the signal in the silent section is deleted. Then, they are read from the ring memory in the order of writing and output.

[0003]

The above-mentioned speech speed conversion apparatus is applied to a reproducing apparatus for reproducing a standard-speed video signal and a standard-speed audio signal at n-times speed. By outputting the signal, it is possible to clearly hear the conversation content and the like, and it is possible to provide a high quality reproduced sound to the viewer.

[0004] In the above-mentioned speech speed conversion device, the output time length of the output n-times video signal and the corresponding audio signal whose speed has been converted to a substantially standard speed are different.
There is a problem that a shift occurs in the output timing, and the shift increases with time.

Therefore, in the reproducing apparatus, the audio section exceeding the predetermined length is deleted from the n-times speed audio signal in the predetermined section from the start of reading, so that the timings of the two sections are made coincident with each other in the predetermined section. This defect has been mitigated. In other words, although it is inevitable that the signal in the voice section is truncated to some extent, the truncation is allowed in consideration of the advantage that the sound can be heard with a substantially standard speed reproduction sound.

However, the above-mentioned problem is not solved satisfactorily. For example, when reproducing recorded information in which the number of silent sections to be deleted is extremely small, the number of audio signals to be truncated increases, and the original purpose can be achieved. Absent.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and should be reproduced when a speed-converted n-speed audio signal, which is obtained by reproducing a standard-speed audio signal at n-times speed, to approximately the standard speed, is output. Suppress signal truncation of voice section,
An object of the present invention is to provide a speech speed conversion / reproduction device capable of providing a viewer with high-quality reproduction contents in which a loss of reproduction sound is suppressed.

[0008]

According to a first aspect of the present invention, there is provided a speech speed conversion / reproduction apparatus which reproduces a standard speed audio signal recorded on a recording medium at n times speed (n> 1), and reproduces the reproduced n times speed audio signal. Means for detecting a write state of the memory in a speech speed conversion / reproducing apparatus for converting the speed of a signal of the voice section into a substantially standard speed, writing the converted signal into a memory, and outputting a voice signal read from the memory; Means for controlling the reproduction speed from the recording medium in accordance with

A speech speed conversion / reproduction apparatus according to a second aspect of the present invention converts a standard speed audio signal recorded on a recording medium to an n-times speed (n> n).
In the speech speed conversion / reproducing apparatus which reproduces the signal in the audio section of the n-times speed audio signal reproduced in 1), converts the speed into a substantially standard speed, writes the converted signal into a memory, and outputs the audio signal read out from the memory, Means for detecting a writing state, means for measuring a period during which the state is continued when detecting that writing to the memory is not performed, and comparing the measured period with a predetermined threshold value Means for decelerating the reproduction speed when it is determined that the threshold value is exceeded, for converting the audio signal reproduced from the recording medium at the reproduction speed into a substantially standard speed and writing it to the memory. It is characterized by having done.

A speech speed conversion / reproduction device according to a third invention reproduces a standard speed video signal and a standard speed audio signal recorded on a recording medium at n times speed (n> 1), and reproduces the reproduced n times speed audio signal. Means for converting the speed of a signal in the audio section into a substantially standard speed, writing the converted signal into a memory, and outputting the read n-times video signal and the audio signal read from the memory, for detecting a write state of the memory. And means for controlling the reproduction speed from the recording medium in accordance with the detected writing state.

A speech speed conversion / reproduction apparatus according to a fourth aspect of the present invention reproduces a standard speed video signal and a standard speed audio signal recorded on a recording medium at n times speed (n> 1), and reproduces the reproduced n times speed audio signal. Means for converting the speed of a signal in the audio section into a substantially standard speed, writing the converted signal into a memory, and outputting the read n-times video signal and the audio signal read from the memory, for detecting a write state of the memory. And means for measuring a period during which the state continues when it is detected that writing to the memory has not been performed, and comparing the measured period with a predetermined threshold value. Means for decelerating the reproduction speed when it is determined that the speed exceeds the threshold value, wherein the audio signal reproduced from the recording medium at the reproduction speed is converted into a substantially standard speed and written into the memory. To.

A speech speed conversion / reproduction apparatus of the present invention reproduces a standard speed audio signal recorded on a recording medium at n times speed, and converts the speed of a reproduced audio section signal of the n times speed audio signal to approximately standard speed. To write to a memory (ring memory) and output an audio signal read from the memory. Also, in parallel with the output of the audio signal, the state of writing to the memory is monitored, and when it is detected that writing to the memory has not been performed, a period during which the state continues is measured,
When it is determined that the measured period exceeds a predetermined threshold value, it is determined that the writing has been interrupted due to the amount of the written signal reaching the memory capacity limit, and the reproduction speed is reduced. Let it. This suppresses the audio signal to be reproduced from being truncated.

The audio signal written in the memory is read out and output in the order of writing, even during deceleration reproduction. Therefore, the free space of the memory will eventually be restored, and the data can be reproduced at the original reproduction speed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a configuration of a speech speed conversion / reproduction apparatus according to the present invention. In FIG. 1, reference numeral 1 denotes an audio head for reproducing a recording signal recorded on a magnetic tape. A reproduction signal read by the audio head 1 is given to an equalizer amplifier 2. The equalizer amplifier 2 compensates for the amplitude frequency characteristic of the given reproduction signal, amplifies the signal level to -19 dBs, and supplies the amplified signal level to the amplifier 3. The amplifier 3 controls the level of the given reproduction signal to control the A / D (A
(nalog-to-Digital) conversion circuit 4. A digital signal obtained by A / D conversion by the A / D conversion circuit 4 is supplied to a DSP (Digital Signal Processor) 5 via a bus.

The DSP 5 is manufactured for the speech speed conversion function of the speech speed conversion device disclosed in Japanese Patent Application Laid-Open No. 8-147874, and separates a given voice signal into a voice section and a silent section. , Only the signal of the voice section is compressed / expanded in the wavelength direction and output. The DSP 5 is connected to the memory I / F 6 via a bus, performs a speech speed conversion process on the given digital signal, and provides the digital signal to the memory I / F 6. The memory I / F 6 writes the applied digital signal to the ring memory 7.

The digital signal written in the ring memory 7 is read out by a command from a microcomputer 9 connected to the bus via a microcomputer I / F 8, and is read out by a digital-to-analog (D / A). It is provided to the conversion circuit 10. The D / A conversion circuit 10 converts a given digital signal into an analog signal (audio signal) and converts the digital signal into an LPF (Low Pass Filtration).
er) Give to 11. The LPF 11 cuts high-frequency noise included in the given audio signal and supplies the cut-off signal to the amplifier 12. The amplifier 12 amplifies the given audio signal and changes over the switch 13
To the selected terminal.

The other selected terminal of the changeover switch 13 is provided with an output signal (audio signal) of the equalizer amplifier 2. The audio signal given to the terminal selected by the changeover switch 13 is supplied to the LI through the mute circuit 14.
Provided to NE amplifier 15. The LINE amplifier 15 amplifies the level of the given audio signal up to -7 dBs and outputs it so as to be compatible with the audio reproduction output unit connected to the output terminal side. Also, a motor 16 for controlling the running of the magnetic tape is provided.
Receives power supply from the motor drive circuit 17. The motor drive circuit 17 is connected to the microcomputer I / F via the bus.
8 and drives the motor 16 based on a rotation speed control signal given from the microcomputer 9.

On the other hand, a signal line for transmitting an audio signal from the memory I / F 6 to the ring memory 7 is connected to a microcomputer 9.
, And the audio signal is supplied to a memory status terminal (hereinafter, referred to as an MS terminal) of the microcomputer 9. The microcomputer 9 detects that an audio signal has been written to the ring memory 7 while there is an input to the MS terminal, and that the audio signal has been written to the ring memory 7 while there is no input to the MS terminal. It detects that there is no. Thus, the state of writing to the ring memory 7 is detected, and the rotation speed of the motor 16 and the timing of reading by the D / A conversion circuit 10 are appropriately commanded according to the detected state of writing.

As described above, the absence of an input to the MS terminal of the microcomputer 9 indicates that no audio signal has been written. It is not possible to distinguish whether the error is caused by the error or the interruption of the writing due to the capacity limit of the ring memory 7. Generally, the former is shorter. Therefore, a predetermined threshold value is determined, and it is determined whether or not the write state of the ring memory 7 is interrupted based on whether or not the threshold value has been reached.

FIG. 2 is a flowchart showing a speech speed conversion / reproduction processing procedure of the microcomputer 9. First, the internal counter of the microcomputer 9 is reset (S
1). The writing state of the ring memory 7 is detected (S2), and it is determined whether or not the writing is being performed (S3). When it is determined that the writing is being performed, the process returns to S1, and the subsequent procedures are repeated. When it is determined in S3 that writing is not being performed, the value of the counter is incremented to count the writing stop period (S4). It is determined whether or not the count value has reached the threshold value (S5). If it is determined that the count value has not reached the threshold value, the process returns to S2, and the subsequent steps are repeated. Also,
When it is determined that the threshold value has been reached, a deceleration command is given to the motor drive circuit 17 (S6).

According to the above processing procedure, the ring memory 7
When the writing stop to the predetermined period is reached, it is determined that the writing state is in the writing interrupted state due to the capacity limit, and by giving a deceleration command to the motor drive circuit 17,
The playback speed is controlled to suppress the truncation of the audio signal.

[0022]

According to the speech speed conversion / reproduction apparatus of the present invention as described above, the state of writing the reproduction signal to the memory is detected, and when the interruption of the writing due to the limit of the memory capacity is detected, the reproduction speed is reduced. By playing back the recording signal, the truncation of the playback signal is suppressed, so that it is possible to provide the viewer with a high-quality playback sound in which the loss of the playback sound is suppressed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a speech speed conversion / reproduction device of the present invention.

FIG. 2 is a flowchart showing a speech speed conversion reproduction processing procedure of the microcomputer.

[Explanation of symbols]

 4 A / D conversion circuit 5 DSP 6 Memory I / F 7 Ring memory 9 Microcomputer 10 D / A conversion circuit 16 Motor 17 Motor drive circuit

Claims (4)

[Claims] 1. A standard speed audio signal recorded on a recording medium is reproduced at n times speed (n> 1), and a signal in a voice section of the reproduced n times speed audio signal is converted into a substantially standard speed and stored in a memory. A speech speed conversion / reproduction device for writing and outputting an audio signal read from the memory, comprising: means for detecting a write state of the memory; and means for controlling a reproduction speed from a recording medium according to the detected write state. A speech speed conversion / reproduction device characterized by the above-mentioned. 2. A standard speed audio signal recorded on a recording medium is reproduced at an n-times speed (n> 1), and a signal in a voice section of the reproduced n-times audio signal is speed-converted to a substantially standard speed and stored in a memory. A speech speed conversion / reproduction device for writing and outputting an audio signal read from the memory, wherein: a means for detecting a write state of the memory; and when detecting that writing to the memory is not performed, the state is continued. Means for measuring a period for performing the reproduction, and a means for comparing the measured period with a predetermined threshold value, and when it is determined that the threshold value is exceeded, reducing the reproduction speed. A speech speed conversion / reproduction apparatus, wherein a speed of an audio signal reproduced at a speed is converted to a substantially standard speed and written into the memory. 3. A standard speed video signal and a standard speed audio signal recorded on a recording medium are respectively reproduced at n times speed (n> 1), and a signal in a sound section of the reproduced n times speed audio signal is set to approximately a standard speed. A speech speed conversion device for converting the speed and writing to a memory and outputting an n-fold speed video signal read and an audio signal read from the memory, comprising: means for detecting a write state of the memory; and recording according to the detected write state. Means for controlling a reproduction speed from a medium. 4. A standard-speed video signal and a standard-speed audio signal recorded on a recording medium are reproduced at n-times speed (n> 1), respectively, and a signal in a sound section of the reproduced n-times speed audio signal is set to approximately a standard speed. In a speech speed conversion device that outputs speed-converted and written to a memory and outputs an n-fold speed video signal read and an audio signal read from the memory, a unit that detects a write state of the memory, and writing to the memory is performed. Means that measures a period during which the state continues, and compares the measured period with a predetermined threshold value, and when it is determined that the threshold value is exceeded, reduces the reproduction speed. Means for converting the speed of an audio signal reproduced from the recording medium at the reproduction speed to a substantially standard speed and writing the converted signal into the memory.