Audio

Siemens Stiftung

The Ear, Hearing and Hearing Impairment: Speech as highly complex sound signal

Recording:
A sentence spoken which also serves as an example of frequency-spectographical analysis in the topic "Types of sound".

Speech sounds are fluctuating sound signals where the composition of frequencies changes all the time.

Aperiodical overlap periodical parts. Unlike noises, some of which have similar frequency curves, sound in speech is always the carrier of meaning or of messages sent out by the speaker. Other noises like smacking of lips, hissing, rhythms, basic pitch are typical of the individual (acoustic fingerprint) but not essential for the speech content!

Information and ideas:
Supplementary to worksheets and transparencies.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves
Communication and understanding

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Siemens Stiftung

Auditory path - brain parts hearing

Labeled graphic:
"Auditory pathway? describes route taken by auditory nerve impulses in and through the brain. But the hearing process is not over yet.

The auditory pathway is the nerve tract for the sensation of hearing.
People used to think that the senses were more localised. Now we know that apart from the auditory pathway, lots of other parts of the brain are involved, too - parts that are also used by the other senses. It is this that makes it possible for human intelligence to understand abstract concepts beyond the mere recognition of patterns. To be able to understand the complex facts of a complex sentence does, after all, involves more than recognizing the words together.

Information and ideas:
Further information regarding this graphic is available as information sheet on the media portal of the Siemens Stiftung.

Relevant for teaching:
Reception and processing of information
Perception, recognition, action

Website

Siemens Stiftung

The Ear, Hearing and Hearing Impairment: Musical instruments and how they function

Website: Open source project on music where there are lots of articles on musical instruments. Open source project on music where there are lots of articles on musical instruments. Relevant for teaching: Sound/acoustics: parameters Vibrations and waves

Anderer Ressourcentyp

Siemens Stiftung

The route of sound through the cochlea

Information sheet:
The structure of the cochlea and the conduction of sound through the cochlea are explained.

It is shown that the entire cochlea is a fluid canal and that is where the fluid vibrations are converted into nerve impulses by the sensory hair cells.

Information and ideas:
As information source for the teacher or to be printed out and distributed to the students.
The media used in the information sheet are available as individual media files on the media portal of the Siemens Stiftung.

Relevant for teaching:
Structure and functions of a sensory organ
Reception of stimuli and transmission of information
Functions of senses


Dieses Material ist Teil einer Sammlung

Anderer Ressourcentyp

Siemens Stiftung

Guideline for the "Physics of sound - basic phenomena" media package

Guideline:
This document provides an overview of the central theme of the media package "Physics of sound - basic phenomena" with regard to content and teaching.

This guideline is aimed at teachers. All the media files in the package are presented. The guideline also provides teaching methods. Possible areas of use of the individual media are presented.


Dieses Material ist Teil einer Sammlung

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Siemens Stiftung

Microphone - transparent

Graphic:
With a moving coil microphone (dynamic microphone), the coil moves in "time" with the sound and produces a tone-frequency current.

In a microphone the mechanical energy of the sound waves is transduced into electric energy. From the mechanical vibrations the microphone produces an electric signal of the same frequency and amplitude.

Information and ideas:
Explanation of the process of sound transduction as it occurs in the inner ear of a human being using a technical device familiar to the students.

Relevant for teaching:
Sound/acoustics: parameters
Communication and understanding
Vibrations and waves

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Siemens Stiftung

Guitar, a classical string instrument

Photo:
Sound is produced by plucking strings and their vibrations are reflected by the resonance of the guitar body.

The vibration of the strings is transmitted to the body (soundboard) of the guitar which in turn vibrates and stimulates the air in the hollow body to vibrate itself. Finally a much bigger volume of air is now vibrating, the sound of the strings is much more clearly audible.

Information and ideas:
Guitar, violin and piano are good examples to illustrate the production of sound through vibrating objects on the one hand and, on the other hand, to show the importance and function of resonance bodies.

Relevant for teaching:
Acoustic phenomena
Sound/acoustics: parameters
Vibrations and waves

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Siemens Stiftung

The Ear, Hearing and Hearing Impairment: Differentiated frequency ranges in the cochlea

Labeled graphic:
Position of the receptors for tones of varying frequencies in the spiral canal of the human cochlea.

Frequencies between 16 hertz (hertz = vibrations per second, abbr.: Hz) and 20,000 Hz can be heard by the human ear.
To differentiate these frequencies, the receptors for high tones are at the beginning of the canal, those for the low tones at the apex of the cochlea.

Information and ideas:
The illustration is suitable for explaining or revising fundamentals of Physics like sound, frequency and vibrations.
Usable in a worksheet, for work together on the digital projector, or as an overhead transparency.

Further information regarding this graphic is available on the media portal of the Siemens Stiftung.

Relevant for teaching:
The human body
Structure and function of a sense organ
Perception of sound
Human hearing ability
Communication and understanding

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Siemens Stiftung

Speech signal - individual word

Chart:
Screenshot of the oscillographic curve of the spoken word "dogs".

Speech sounds are fluctuating sound signals where the composition of frequencies changes all the time.
Aperiodical overlap periodical parts. Unlike noises, some of which have similar frequency curves, sound in speech is always the carrier of meaning or of messages sent out by the speaker. Other noises like smacking of lips, hissing, rhythms, basic pitch are typical of the individual (acoustic fingerprint) but not essential for the speech content!

Information and ideas:
Supplementary to worksheets and transparencies.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves
Communication and understanding

Bild

Siemens Stiftung

The Ear, Hearing and Hearing Impairment: Sound absorption

Graphic:
If sound waves strike an obstacle with a corresponding material structure, they are absorbed, i.e. the entire mechanical energy of the sound is converted into thermal energy.

This effect is enhanced by sound barrier walls made of porous materials. By means of multireflection and dispersion, the passage of sound in such materials is extended considerably. The sound peters out.

Information and ideas:
Reference to students' everyday world: silence after snowfall.
Can be checked with the students in an experiment.

Relevant for teaching:
Sound/acoustics: parameters
Vibrations and waves