JP2012058355A - Sound playback apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound playback apparatus which eliminates the risk of missing music, without increasing noises, even if there are big noises.SOLUTION: A control section 107 in a portable sound playback apparatus 10 monitors whether or not the state where the volume of surrounding noises is higher than a first value is continued for a second time and, if continued, causes a decoder 104 to stop decoding. After playback is stopped, the control section 107 monitors whether or not the state where the volume of surrounding noises is lower than a third value is continued for a fourth time and, if continued, causes the decoder 104 to resume decoding from a time point returned from a time point of playback stop for a predetermined time. Thus, even if there is a missed portion until playback stop because of generation of high volume of surrounding noises, playback of sounds is resumed from the time point returned from the time point of playback stop after the volume of surrounding noises is reduced, so that the missed portion is played back at all the time and missing is not incurred.

Description

  The present invention relates to a sound reproducing device, and more particularly to a portable sound reproducing device.

  Various companies provide portable sound reproduction devices that can be easily carried around and enjoy music and audio programs. When enjoying music with a portable sound reproducing device, it is dangerous if no ambient sounds can be heard, so sealed headphones are not often used. However, if the ambient noise is high, there is a problem that it is difficult to hear music.

  By the way, conventionally, a noise sensitive automatic volume control device has been proposed that automatically adjusts the volume of sound to be heard according to the amount of ambient noise (see, for example, Patent Document 1). By using such a noise-sensitive automatic volume control device, it is possible to listen to music in a good state even if the surrounding noise is large.

  In addition, an audio output device such as a voice synthesizer used in a vending machine or the like has also been proposed in which the audio output amount is variable according to the amount of ambient noise (for example, Patent Documents). 2).

  FIG. 4 shows a block diagram of an example of the audio output device described in Patent Document 2. In this audio output device, the audio signal from the audio synthesizer 1 is output from the speaker 3 through the variable gain amplifier 2. The voice output device obtains a voice signal corresponding to the ambient noise with the microphone 4 and supplies the voice signal to the detector 5, and the detected signal corresponding to the amount of noise passes through the gain control signal generator 6 as a gain control signal and is a variable gain amplifier. 2 is supplied. As a result, when the amount of noise is large, the gain of the variable gain amplifier 2 is increased to increase the amount of sound output from the speaker 3, and when the amount of noise is small, the gain of the variable gain amplifier 2 is decreased to be output from the speaker 3. Reduce the amount of audio output.

JP-A-9-186540 JP-A-1-189215 (FIG. 1)

  However, when the noise-sensitive automatic volume control device described in Patent Document 1 and the sound output device described in Patent Document 2 are applied to a portable sound playback device, the sound playback device is on a train and enters a tunnel. If the surrounding noise becomes too loud, the volume of the sound playback device will become extremely loud, which may make it difficult to hear or cause damage to hearing, so there is a limit to increasing the volume. is there.

  Therefore, although an upper limit is set for the volume, in such a case, when the noise is loud, not only the music is missed but also the noise and the reproduced sound are combined, resulting in an increase in the noise.

  As described above, the conventional sound reproducing apparatus has a problem that it cannot listen to music or an audio program when the noise is too loud.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a sound reproducing apparatus that does not increase noise even when the noise is loud and that does not cause a risk of listening to music or an audio program.

  To achieve the above object, the present invention provides a storage means for storing a sound source signal to be reproduced, a reproduction means for reproducing a sound source signal stored in the storage means, and a volume detection means for detecting the volume of ambient noise. And an output terminal for outputting the sound source signal reproduced by the reproduction means to the reproduction device, and a state in which the volume of ambient noise detected by the volume detection means is larger than a predetermined first value continues for a first time. When the reproduction of the reproduction means is stopped, the reproduction of the reproduction means is stopped when the state in which the volume of the surrounding noise is smaller than the predetermined second value continues for the second time. And control means for starting reproduction by the reproduction means of the sound source signal stored in the storage means from a point on the reproduction start side corresponding to a predetermined time longer than the time.

  According to the present invention, the reproduction volume is adjusted according to the ambient noise, and when the ambient noise is larger than the predetermined value, the reproduction is temporarily stopped, and the reproduction is stopped after the noise is reduced. Since the playback is resumed from the time when it returns a little, the noise is not increased even when the noise is loud, and the possibility of missing a music or audio program can be eliminated.

1 is a system configuration diagram showing an embodiment of a sound reproducing device of the present invention. It is a block diagram of one embodiment of a sound reproduction device of the present invention. It is a flowchart for description of reproduction control of the sound reproduction apparatus of the present invention. It is a block diagram of an example of the conventional audio | voice output apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an external configuration diagram of an embodiment of a sound reproducing device of the present invention. In the figure, a portable sound reproducing device 10 is connected to a headphone 11 and has a microphone 12. Here, the headphones 11 include earphones. Moreover, although the microphone 12 is provided in the portable sound reproducing device 10, it is not limited to this and may be provided in the headphone 11.

  FIG. 2 shows a block diagram of an embodiment of the sound reproducing apparatus of the present invention. In the figure, the same components as those in FIG. In FIG. 2, a portable sound reproducing apparatus 10 includes a power supply unit 101, a storage unit 102 such as a semiconductor memory, a reading unit 103, a decoding unit 104, an amplification unit 105 whose gain can be variably controlled by a control signal, an output terminal 106, A control unit 107 and an operation unit 108 are included.

  The headphone 11 is connected to the output terminal 106 of the portable sound reproducing device 10. In the storage unit 102, for example, a plurality of music pieces and language learning materials are compressed and recorded in the MP3 (Mpeg1 Audio Layer3) format. Each unit is supplied with power from the power supply unit 101.

  Now, when the operation unit 108 of the portable sound reproduction apparatus 10 is operated to instruct reproduction, the MP3 file of the music stored in the storage unit 102 is read by the reading unit 103 under the control of the control unit 107 and the decoding unit 104 is read. And amplified by the amplifying unit 105 and then output as an acoustic signal from the output terminal 106. Thereby, the user can listen to the music with the headphones 11. While listening to this music, the portable sound reproduction device 10 performs reproduction control described below.

  Hereinafter, the playback control procedure of the sound playback apparatus of the present embodiment will be described with reference to the flowchart of FIG. First, the control unit 107 detects an ambient noise signal collected by the microphone 12 to detect the ambient noise volume, and determines whether the volume is greater than a first value (step S301). .

  When the ambient noise volume is equal to or lower than the first value, the control unit 107 instructs the amplification unit 105 to amplify the signal in proportion to the ambient noise volume, and outputs the audio signal from the output terminal 106. (Step S302). Thereby, when the volume of the surrounding noise is equal to or lower than the first value, the user can listen to the music whose playback volume is automatically controlled according to the volume of the noise with the headphones 11.

  When the volume of ambient noise is larger than the first value, the control unit 107 monitors whether the state continues for a second time T2, for example, 4 seconds or more (step S303), and continues for 4 seconds or more. In this case, the decoding unit 104 stops decoding and stops reproduction (step S304). At this time, the point in time when playback is stopped is defined as point A. In this embodiment, for example, it is assumed that the time point A is 1:30:45 in the display of hours: minutes: seconds.

  When the reproduction is stopped, the control unit 107 monitors the volume of ambient noise again, and determines whether or not the volume of ambient noise has become smaller than the third value (step S305). By making the third value smaller than the first value, it is possible to prevent the operation from being repeated unnecessarily. When the volume of the surrounding noise is smaller than the third value, the control unit 107 monitors whether the state continues for a fourth time T4, for example, 4 seconds or more (step S306), and continues for 4 seconds or more. In that case, the decoding unit 104 starts decoding and starts reproduction (step S307).

  At this time, the decoding unit 104 performs decoding from the time point when the fifth time T5 (fixed) is returned from the point A. For example, when the time point A is 1:30:45 and the fifth time T5 is 6 seconds, the playback starts from 1:30:39. The fifth time T5 at this time is set longer than the second time T2.

  As a result, even if there is a portion that was missed during the second time until playback stops because the volume of the ambient noise was greater than the first value, the volume of the ambient noise is the third value. Since it is smaller and becomes no longer noisy and is played back by the fifth time T5, the missed portion is always played back, and no missed hearing occurs. If the audio program being listened to is a language learning material or a program with a story such as rakugo, it is more effective because there is no missed listening. In addition, fading out when stopping the playback and fading in when starting the playback are preferable because they are easier to hear.

  As described above, according to the portable sound reproducing device 10 of the present embodiment, when the noise is equal to or lower than the predetermined volume, the reproduction volume is varied according to the noise level, and the noise is higher than the predetermined volume. When it is loud, playback is stopped until the noise has subsided, and after the noise has subsided, playback is started from the point when the playback stops for a predetermined time. Without fear of listening to music and audio programs.

DESCRIPTION OF SYMBOLS 10 Portable sound reproduction apparatus 11 Headphone 12 Microphone 101 Power supply part 102 Storage part 103 Reading part 104 Decoding part 105 Amplifying part 106 Output terminal 107 Control part 108 Operation part

Claims (1)

Storage means for storing a sound source signal to be reproduced;
Reproduction means for reproducing the sound source signal stored in the storage means;
Volume detection means for detecting the volume of ambient noise;
An output terminal for outputting the sound source signal reproduced by the reproduction means to a reproduction device;
When the ambient noise volume detected by the volume detection means is larger than a predetermined first value for a first time, the reproduction means is stopped and thereafter the ambient noise volume is predetermined. When the state smaller than the second value continues for the second time, the storage starts from the point on the reproduction start side corresponding to a predetermined time longer than the first time with respect to the point of time when the reproduction of the reproducing unit is stopped. And a control means for starting reproduction by the reproduction means of the sound source signal stored in the means.

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