| 摘要 |
<p>The present invention produces an audible image of a time dependent signal by digitizing the signal to produce a plurality of discrete level signals, and producing a different audible tone signal for each level of the discrete level signals. A speaker is provided for producing audible sounds and circuitry is provided for driving the speaker to produce an audibly perceptible reference frame indicative of a predetermined time duration and also for driving the speaker with the audible tone signals such that the audible tone signals have the same time orientation with respect to each other as the discrete level signals have in the time dependent signal.</p> |
