Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker
Patent
1992-07-28
1997-01-07
Kuntz, Curtis
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
H04R 300
Patent
active
055925596
ABSTRACT:
A speaker driving circuit including a switch which switches the supplying of current to a speaker on and off by using a binary pulse-density-modulated (PDM) signal produced by .DELTA..SIGMA.-modulating a digital audio signal from a digital low-pass filter. For example, when the PDM signal is "1", the switch causes the output current of the direct-current power source to flow to the voice coil. On the other hand, when the PDM signal is "0", the switch stops the current to flow to the voice coil. This switch may be replaced with a switch which switches the direction of current flowing through the voice coil. The diaphragm of the speaker is driven by controlling the supplying of current in such a manner. With this arrangement, since a D/A converter for a digital audio signal is not required, there is no need to install an amplification circuit for an analog signal. Thus, the speaker driving circuit has a simplified structure but is capable of driving the speaker stably.
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"Possibility for Developing PCM Digital Speaker" (JAS Journal, Jan. 82, Japan).
Hayase Toru
Takahashi Ryutaro
Kuntz Curtis
Lee Ping W.
Sharp Kabushiki Kaisha
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