JPH0844383A - Pseudo sound generating device - Google Patents

Abstract

PURPOSE:To provide a pseudo sound generating device generating smooth reproduced sounds with specific voice data while making voice data small and making a memory capacity for a voice data recording small. CONSTITUTION:This device is provided with a reproducing control part 8 reproducing voice data recorded in the recording area of a voice data memory 7 in order of the recording and also reproducing them in reverse order of the recording. Then, the reproducing control part 8 can reproduce many kinds of patterns of voices with small data by reproducing adaquately or continuously the same data with the changeover of reproducing directions and makes continuous reproduced sounds smooth. Moreover, a voice having no sound cutting feeling is reproduced or a voice having a wideband frequency is generated by providing a volume adjusting part 9 and a reproducing speed changing means 11 in the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device used in, for example, a game machine or a passenger compartment to generate a pseudo sound such as an engine sound.

[0002]

2. Description of the Related Art Generally, the engine sound of a car used in a car race on a game machine is required to generate a more realistic pseudo sound using voice synthesis. There is also proposed a pseudo-noise generation device that resembles the engine sound of a luxury car different from the above.

For example, a vehicle-mounted pseudo engine sound reproducing apparatus proposed in Japanese Patent Application Laid-Open No. 5-11788 detects an engine speed signal from a cigarette lighter socket and records a raw engine sound in advance as voice data. The recorded data in the ROM is reproduced according to the number of rotations and output as voice.

The sound data of such engine sound is RO
In addition to recording by M, arbitrary audio data is recorded in a memory card, and a desired tone color is generated by selecting a desired memory card.

[0005]

By the way, the above-mentioned ROM
And memory cards are expensive and have a limited storage capacity, and an extremely large memory capacity is required to record audio data in the entire engine speed range, so audio data in the entire engine speed range is required. Has to be roughly sampled, resulting in the reproduction sound being cut off, and the intermittent sound being uncomfortable especially when the reproduction speed is slow.

[0006] Further, due to the difference in the engine speed ascending speed and the descending speed, or even the long-time reproduction at a constant speed, the timbre changes respectively. The audio data must be recorded for each change condition, which requires an extremely large storage capacity.

[0007] Therefore, the present invention is to provide a pseudo-sound generation device in which unnaturalness is not noticeable with a small amount of audio data while suppressing the storage capacity.

[0008]

SOLUTION: A sound data memory sequentially records continuous sound data for a predetermined period as data divided for each recording area, and reproduces the record data in a recording order and a reverse recording order. A reproduction control unit for reproducing a predetermined sound is provided. The recorded sound is used as the engine sound, and when continuously reproducing each audio data corresponding to the engine sound when the engine speed rises and falls and when the engine speed is constant, the playback switching part is wrapped and played, and playback near the switching is performed. In addition, a volume adjusting unit for performing fade-out and fade-in processing is provided.
Further, it is provided with a reproduction speed changing means for changing the reproduction speed of the same audio data recorded in the audio data memory.

[0009]

With a small amount of voice data recorded in the voice data memory, a relatively smooth wide-band voice with less unnaturalness can be played back. There will be less voice.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the most basic block diagram of the present invention as an example of a pseudo-sound generating device for reproducing an arbitrary engine sound in a vehicle compartment. The power unit operating state output unit 1 is attached to, for example, an ignition circuit 1A that outputs an ignition pulse signal from an ignition system of an engine, a pickup sensor 1B arranged in an engine gear unit, a cigarette lighter socket of a vehicle, and engine ignition noise. Attachment electrode 1C that can be extracted, valve opening sensor 1D that can output a signal corresponding to the engine speed by the engine throttle opening, or motor rotation that outputs a signal corresponding to the motor speed that is the power unit of an electric vehicle Sensor 1
It is configured by a device such as E that can obtain an output signal corresponding to the rotational operating state of the engine or motor that is the power unit of the vehicle.

Here, the structure in which the attachment electrode body 1C is used will be described. A voltage signal on which the ignition noise of the engine is superimposed is output to the electrode of the cigarette lighter socket, and the attachment electrode body 1C has this voltage signal. The voltage signal is provided by an electrical connection. Since high-frequency noise is superimposed on this voltage signal in addition to engine ignition noise (a signal corresponding to the engine speed), the electric signal obtained from the attachment electrode body 1C passes through the signal filter circuit 2 and the ignition noise component is It is taken out as a rotation speed signal.

For example, the signal filter circuit 2 can have a filter function of deciding a signal having a width (narrow width) that is not possible as an engine rotation pulse as noise and ignoring the signal edge. .
This filter function can also be provided by the arithmetic processing unit 3 such as a microcomputer to be described later. For example, in the case of a 4-cycle 4-cylinder engine, the engine ignition period at 15000 rpm (maximum speed) is 2 msec. It is possible to count only the engine speed component signal by deciding that a signal below that is an impossible noise signal and ignoring the pulse edge that is the count processing target by measuring the pulse period when such a signal is input.

As the above-mentioned noise removing method,
Only the pulse signal is passed through the signal filter circuit 2, and the correct characteristic of the engine ignition signal change is stored in the arithmetic processing unit 3 so that the characteristic of the actually input pulse signal (pulse width, pulse degree direction, When the variation amount) deviates from the storage characteristic, it is possible to judge that it is noise and input only the pulse signal satisfying the characteristic as the engine ignition corresponding signal.

The voltage signal containing the engine ignition noise signal supplied by the attachment electrode body 1C corresponds to the engine speed through the signal filter circuit 2 as described above or by the input stage determination process in the arithmetic processing unit 3. It is input as a pulse signal. In the engine speed detection in the arithmetic processing unit 3, the counter 4 counts the clock signal from the high-frequency clock signal generating unit 5 for each input pulse signal cycle, and the arithmetic unit 6 calculates each input pulse signal based on this count value. The engine speed is obtained by calculation from the pulse cycle.

The arithmetic unit 6 outputs a predetermined memory address designation signal corresponding to the thus obtained rotation speed data, and stores a voice data memory (ROM).
The designated address storage data of 7 is read. The setting of the address designation signal in the arithmetic unit 6 is made to correspond to the memory address of the voice data stored in the voice data memory 7, and the voice data stored in the voice data memory 7 is rotated by the engine when reproducing it as a voice signal. The address capacity is set depending on how smoothly the number change is made.

In the present embodiment, a raw engine sound of a high-class sports car is recorded by a microphone as voice data to be stored in the voice data memory 7, and the recorded data is subdivided into rotational speed bands by a predetermined resolution and digitized. There is. That is, the signal shown in FIG. 2 in which the engine speed of a high-class sports car is gradually increased from the idling to the accelerator operation to increase the rotational speed to the maximum rotational speed in actual driving, and the engine sound change accompanying the increase in the rotational speed is recorded as an analog frequency signal. Record as A.

The analog frequency signal thus recorded is
For example, it is divided every several m to several seconds to several seconds, and is allocated and recorded in the memory block of the audio data memory 7 in this division unit. A sampling cycle for sampling and digitizing the analog frequency signal A is set to a finer frequency, for example, a 32 KHz signal cycle for each division unit of several tens of msec to several sec.

As shown in FIG. 3, the memory area of the audio data memory 7 is divided into memory blocks 7A, 7B and 7C corresponding to the division units, and each memory block 7A is further divided into the 32 KHz signal and the like. 7A001 and 7A00 that store sampling data for each short cycle
A recording area (address) such as 2,7A003 is set, and the analog frequency signal is stored in this recording area as sampling-digital converted audio data.

The voice data stored in the voice data memory 7 is read from the memory block of the division unit portion corresponding to the input rotation speed in the arithmetic processing unit 3, and the voice data stored in each address in the memory block is synthesized. It is output to the reproduction controller 8 for reproduction as a frequency characteristic signal of the division unit portion.

For example, the audio data recorded in each address of the memory block 7A of the audio data memory 7 is as shown in FIG.
Since the analog frequency signal characteristic of the corresponding division unit portion of is stored as subdivided digital data at the sampling cycle, the digital data read from each address of this memory block 7A is sequentially D-converted at the same conversion cycle as the sampling cycle. Figure 2
An analog frequency signal similar to that shown in can be reproduced.

The audio signal thus generated by the reproduction control unit 8 can be uttered by the sounding body 10 such as a speaker through the volume adjusting unit 9, and the input signal to the arithmetic processing unit 3 can be rotated at a constant speed. If it is continuously input as a number, it can be uttered as a reproduction signal of the division unit portion shown in FIG. 2 having a frequency corresponding to the rotation speed, and the arithmetic processing unit 3 changes the frequency (rotation speed) of the input signal. An address signal (operating state instruction signal) of a corresponding division unit portion is output to the memory unit 7, and audio data is read from the corresponding memory block and an audio signal is generated to generate a raw signal corresponding to the frequency band (rotation speed) of the input signal. It is possible to generate a timbre change very close to the engine sound of. The reproduction controller 8
Is composed of a reproduction speed changing means 11 for changing the reproduction speed (frequency) of the audio data in the audio data memory 7.

By storing the desired engine sound in the voice data memory 7 in advance with the basic configuration described above, the engine sound can be easily reproduced, but it is smoother with respect to changes in the input signal. If you want to produce a unique engine sound or obtain an engine sound close to reality,
The specific operation of the present invention for reducing the capacity of the audio data memory 7 will be described below.

FIG. 4 illustrates the reproduction function of the reproduction control unit 8 of the present invention in which the sound data memory 7 has a smaller capacity so that the engine sound can be reproduced. As shown in FIG. The capacity is extremely large for dividing and storing in the same memory block system for all rotation speed bands. In particular, in order to obtain a smooth tone change, the division unit must be divided at finer time intervals. Since it is extremely expensive in terms of capacity, relatively narrow band data is stored, and continuous sounds based on this stored data are reproduced by repeating the recording order of the data in the recording area and the reverse recording order. It was done like this.

That is, in the memory block 7A of the voice data memory 7 shown in FIG. 3, the voice data of about several seconds corresponding to the engine sound of a constant engine speed at a predetermined engine speed is recorded in the block. 7A001 to 7An
As shown in FIG. 4, which is sequentially recorded in nn, and the recording form is displayed as a waveform of a sound signal in a simulated manner, the volume is included in the first data and the last data in the recording area of the memory block 7A. There is a considerable difference in the timbre, and if the audio data of the memory block 7A is repeatedly reproduced in the recording order in which it is sequentially recorded in the recording areas 7A001 to 7Ann for a long time reproduction, the reproduction from 7Annn to 7A001 is inevitable. Distortion causes discomfort and unpleasantness of the reproduced sound such as sound interruption with each repetition of reproduction, but in the present invention, the recording area 7A
After playing back in the order of recording to 001-7 Annnn, 7
The audio data of the memory block 7A is continuously reproduced in the reverse recording order from the Annnn to 7A001 direction, and then again in the repeated recording order from the 7A001 and the reverse recording order from the 7Ann.

Therefore, the voice data of the memory block 7A can generate smooth voice without distortion by repeating forward and reverse playback by the playback control unit 8 as indicated by the arrow in FIG. 4 from the recording area in the block. it can.

That is, since the audio data recorded in the recording area of the memory block 7A has a change in the data along the smooth movement in that range, 7A001 is recorded in the reverse recording order after the end of 7Ann during the repeated reproduction. By playing in the same direction, it is possible to always play adjacent recording areas in which smooth change data is recorded, and to prevent unpleasant playback sounds such as sound interruptions and to play smooth continuous sounds. It will be.

Also, the voice data corresponding to the engine sound of a constant rotation speed as recorded in the memory block 7A is 1000
If you set a predetermined number of revolutions, such as rpm, 2000rpm, and 3000rpm, and record it in different memory blocks for each constant number of revolutions, the audio data of the memory block selected according to the input number of revolutions will be recorded. By using the reproduction method similar to the above, similarly, smooth reproduction of the engine sound corresponding to the input rotation speed becomes possible.

This method of reproducing the audio data in the recording area in the memory block enables smooth reproduction without sound interruption during continuous reproduction, but the reproduced audio when the engine speed increases or decreases. It can also be applied to data memory capacity compression.

That is, if the voice data at the time of increasing the engine speed is recorded in the recording area of the memory block 7B, and if the voice data is reproduced in the order of recording from the recording areas 7B001 to 7Bnnn, the sound corresponding to the increase of the engine speed is generated. Can be regenerated, and from 7Bnnn to 7B00
If the reproduction is performed in the reverse recording order to 1, it is possible to reproduce the sound corresponding to the decrease in the engine speed.

This is a reproduction signal of a downward curve that gradually decreases as the characteristic data corresponding to the upward curve of the frequency waveform of the audio data increases as the number of revolutions is reproduced in reverse recording order, which results in this. Is data that is similar to the voice data when the engine speed actually drops, and can be reproduced as an engine sound equivalent to that when the engine speed drops.

Therefore, if only one of the voice data when the engine speed increases and the voice data when the engine speed decreases is recorded in the memory block, the recording target voice can be reproduced by reproducing in the recording order. Also, by playing back in reverse recording order, it is possible to play back the sound equivalent to the other sound, and the memory capacity can be simply halved. When the ascending / descending is performed continuously, smooth reproduction with no noticeable sound interruption can be performed by the forward / reverse reproduction switching in the storage area at the corresponding switching point.

The selection of the recording order reproduction and the reverse recording order reproduction corresponding to the rise and fall of the engine speed is performed by the arithmetic processing unit 3
Based on the rotation speed signal obtained by the above, the reproduction control unit 8 determines whether the rotation speed is rising or falling, and executes the reproduction by specifying the reading order (addressing order) to the audio data memory 7. It However, the arithmetic processing unit 3 may determine the change state of the engine speed, and the reproduction control unit 8 may specify the reproduction order based on the determination result. It also has a function of converting digital data into an analog signal by inputting and inputting it as an audio signal.

Further, the sound volume generated by the reproduction control unit 8 is adjusted by the sound volume adjusting unit 9 to adjust the sound volume of the pseudo engine sound to be generated. The sound volume adjusting unit 9 adjusts the sound volume in the vicinity of the switching between the rising / falling data and the constant rotation speed data by the change point determination of the engine speed by the arithmetic processing unit 3, and fades out and fades in the vicinity of the switching. An in-process is performed to alleviate an unnatural voice cut-off state at the switching point and reproduce as a smooth change in sound.

For example, the memory block 7A of the audio data memory 7 stores the audio data corresponding to the engine sound at a constant rotation speed, and the memory block 7B records the audio data corresponding to the engine sound when the engine speed increases. If the input rotation speed changes in the constant rotation speed region of 7A as the engine rotation speed of 7B increases, the change processing state is determined by the arithmetic processing unit 3, and the change point is around the switching point. 7A and 7 at playback timing
Simultaneous reproduction (reproduction with a lap portion) performed near the switching point of the B audio data, and fade-out and fade-in processing for each reproduced signal as volume adjustment near the switching point. The same processing (processing for gradually reducing the volume of one volume to mute the volume of the other volume and gradually increasing the volume of the other volume from the mute state) is performed in the same manner to reduce trace cuts by the hybrid processing.

As a result, as shown in FIG. 5, the relationship of the volume dB with respect to the reproduction time t corresponding to the change in the input rotation speed is such that when the engine rotation speed increases to a constant rotation speed, The rising sound from the corresponding memory block 7B and the constant sound from the memory block 7A can be generated as a natural connection by the fade-out and fade-in processing in the lap portion near the switching, and the switching point is blurred and reproduced. It becomes difficult to understand the data switching.

Further, the reproduction speed changing means 11 in the reproduction control unit 8 reproduces the reproduction speed (reproduction speed) of the audio data recorded in the recording area of the memory block 7A, for example, based on the determination of the engine speed in the arithmetic processing unit 3. frequency)
Is changed to generate a voice in a wide engine speed range using the same voice data, thereby reducing the memory capacity.

This is 1000 for memory block 7A, for example.
If audio data corresponding to the engine sound at a constant rpm is recorded, the audio data in the recording area is reproduced at the same reproduction speed as the recording timing.
It is possible to generate a sound equivalent to rpm, but by increasing this playback speed, it is possible to play back as a playback waveform that produces a sound similar to the engine sound corresponding to the engine speed in the higher rotation range. Is set in advance in multiple stages based on the input frequency calculation result in the arithmetic processing unit 3, it becomes possible to generate a voice corresponding to a wide rotation speed band by changing the reproduction speed of a small amount of voice data.

As shown in FIG. 6, the basic data as shown in FIG. 6A is recorded as the rising sound data and is reproduced at the reproduction time t0 (basic reproduction speed). For the reproduced sound, the reproduction time t1 as shown in FIG.
By reproducing the same audio data at a reproduction speed faster than the basic reproduction speed such as <t0, it is possible to apparently reproduce the audio as a voice having a frequency higher than the original audio frequency of the basic data. Conversely, if the same audio data is reproduced at a reproduction speed slower than the basic reproduction speed such as the reproduction time t2> t0 as in C), it can be reproduced as a sound having a frequency lower than the original audio frequency.
As a result, such a reproduction speed is appropriately set and reproduced at a reproduction speed corresponding to the input rotation speed change rate (acceleration / deceleration), so that sounds corresponding to the engine sound corresponding to the acceleration / deceleration of the engine speed are added to the respective sounds. It is possible to reproduce with a small amount of audio data without storing as all data corresponding to deceleration.

Such a reproducing process can be realized by a circuit structure having an extremely small amount of data in combination with the reproducing method of the audio data shown in FIG.

[0040]

As described above, the pseudo sound generating device according to the present invention reproduces a small amount of audio data recorded in the recording area of the audio data memory in the recording order and in the reverse recording order. By reproducing the voice, it is possible to reproduce a wide range of voice by reducing the amount of voice data to be recorded, and it is possible to reduce the memory capacity. Also, the continuity of the reproduced sound can be reproduced as a smooth sound without a feeling of trace cut, and the connection of the recorded audio data can be smoothed by the fade-out and fade-in processing near the switching, By changing the frequency of the reproduced sound by changing the reproduction speed of the audio data in a given memory, it is possible to generate a wideband frequency pseudo sound with a small amount of audio data, and a pseudo sound that can generate a variety of sounds with a small memory capacity as a whole. A generator can be provided.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a representative embodiment of the present invention.

FIG. 2 is an engine sound voltage waveform diagram showing audio data sampling of the present invention.

FIG. 3 is an explanatory diagram of a recording area of an audio data memory which constitutes the present invention.

FIG. 4 is an explanatory diagram of audio data reproduction for explaining an audio data reproduction state of the present invention.

FIG. 5 is an audio characteristic explanatory diagram for explaining fade-out and fade-in processing of the present invention.

FIG. 6 is a playback characteristic explanatory view for explaining the playback speed changing processing of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power unit operating state output unit 3 Calculation processing unit 7 Voice data memory 8 Reproduction control unit 9 Volume adjustment unit 10 Sounding body 11 Reproduction speed changing means

Claims (5)

[Claims] 1. A pseudo sound is generated by voice synthesis by recording and recording a predetermined raw voice such as an engine sound or reproducing recorded data of a voice data memory in which a voice signal similar to the raw voice is recorded. In the simulated sound generator described above, continuous audio data of a predetermined period is sequentially recorded in the audio data memory as divided data for each recording area, and the audio data recorded in the audio data memory is reproduced in the recording order of the recording area. A pseudo-sound generating device, further comprising a reproduction control unit for reproducing the audio data in the recording area in reverse recording order to reproduce a predetermined audio. 2. The voice recorded in the voice data memory is voice data corresponding to an engine sound having a substantially constant number of revolutions, and the record data in the recording area is recorded in a recording order or a reverse recording order by the reproduction control unit. The artificial sound generating device according to claim 1, wherein the artificial sound generating device repeats reproduction. 3. The reproduction control of the sound data recorded in the sound data memory is sound data corresponding to one engine sound when the rotation speed increases or decreases, and the record data corresponding to the one engine sound. The pseudo sound generating device according to claim 1, wherein the engine reproduces the other engine sound by reproducing the sound in the reverse recording order by the unit. 4. The voice data recorded in the voice data memory is voice data corresponding to an engine sound of a substantially constant rotation speed and voice data corresponding to an engine sound when the rotation speed increases or decreases, and the rotation speed increases. When continuously reproducing the voice data at the time of descending or descending and the voice data of a constant number of revolutions, the playback switching part is wrapped and played, and the fade-out and fade-in processing is performed in the playback near this playback switching. The pseudo sound generating device according to claim 1, further comprising a volume adjusting unit. 5. The pseudo sound generating device according to claim 1, further comprising a reproduction speed changing unit that changes a speed at which the audio data recorded in the recording area of the audio data memory is reproduced.